x , » é 3 ia, ales ; City, LE 2 EOIN Gay Lite LES OT ie Be Cay on 3 ’ eG i <4 t ‘ —Emst Mayr Library Museum of Comsorsiive Zoology | it _ Harvard University ) . my, “i % ar " : ~ r ay \ Svat weer. Aten We wy , \ «v \ ¢ - A } \ x } 3 Sg earn i i | ? , 1d 1 Lo ” s 2 « y os 7 2 : is . ‘ ‘ Vou. XVII, Seconp SERIES The Devonian of Missouri By E. B. Branson with chapters on The Bailey Limestone By V, O, Tansey and The Little Saline Limestone By Grace ANNA STEWART Missourt BurREAU OF GEOLOGY AND MINEs H. A. Buehler, Director and State Geologist Rotia, Missourt piatiinnhdimenetheteaiaeetenitctia nie ee scueetnistresiaeoe’ ier os Sa ee ee oe eee: od Rha bream de , BOARD OF MANAGERS. : His Excellency, Arthur M. Hyde, Governor of Missouri, © ex-officio president of the board, Jefferson City. ay Hon. Elias S. Gatch, Vice-President, SL. LOMis. Hon. John P. Connell, Glencoe. -—*Dr. E. M. Shepard, Springfield, Secretary and. Chairman ee of Publications Committee. a Hon. Philip N. Moore, St. Louis. “i . (iti) NE a Pee, ada Pi 2 O° Diet gi" Teddy FAUNA OF THE BAILEY LIMESTONE FAUNA OF THE LITTLE SALINE LIMESTONE TABLE OF CONTENTS. BOARD OF MANAGERS....... RO a rerereatigs Tee knit ee hee aerate eg eta tater a ese aT Mea AMATNIIO NEC eve eg San coe airas hn emcg Gare heck wise Heeb ane ingen Soo, wich aie ee Grad 9 TRAE ATED POAC TON Gin. de vs sce ie nm pee & ele aha ole HPS een Feely olere 25s miele ale Rivinyeie ee Dori OF TRANSMITTAL... 6.2... 22-65 TRoe sr sf ee Rat’ sitar. Meaiss eee oi TUTE COE TLOR Gd 6 16 J (it eee ee ae cece car CC MINOW LWUNDGMENTS.. 6.0 ce tee eee ee ne ee pres ene een eans CHAPTER I. GENERAL ACCOUNT OF MISSOURI DEVONIAN.......... 000s eee eee ees Upper and lower boundaries of the Devonian..........-.-. secrete eee eens Rem EEC? SHOES ae reach eset. ays geen gee tie ot eat Wee eves, Soeisl cae fe/2es las a) eremnig omy ys Br eTIER MAMUSTONE Puts te ee «ina wldels St ak ee ede ew Kg Goss sm are © ene se Moarapiesre a TTO SOME tace..oee cle siete P biels eh. wim aie lene a ere sins ele es pla Oe mingee ele sie sem A cha emote BRST Coed cen eA ee Are ENS MeO EN Mee Pee rrca a (eee bie Ma Res MOL he eae ROR eae od RbnareT eC ENT ATSeren rete se steal care coo a ws eters nko cael onayeleic vane, Ciecs eieuewiiags atelm eae = URES tera Ta LUT me tees mere cue beat scolte Rises s fa cook en ame WS STA esos key PEELE Kiplationships and distribution... 2.02. oe ee ee we ee ee ee PEGE TVaNn aT LGy EA gee ene eRe | ni ae ee Rt Nea rar ening th erie Rcd e arm mci gee Tac APACE EETITO SUCEVEIC Heer Uk PRS cee baa. Weal deta Wisse MLSS ARES ce Talore aah el Sua lw ot ei aeRO Tey ee SHIRAI Hence ee | MEER Sek Tete ate sts via web 8s. Sse wun Saashne ets Pols aes eal eae enn a Ses ne Lolo UTE Ags So ha, cong amtlhee ee une aibe ie cRear ea aie nan in ROE iia Sai La TOP aa eee REM PNGUSH US GIG CEStil DILGIOM yc a ce wise Shera a laissw vie Pk Sd a erases Sea mie © miele] ae SPE SETURA NS LANES rio ea eran ect etc SHIR Pee RON MSS chee. vs Gaeta en slat ais ea” penal oman a aaes Correlation...... Soe Ais: hate a Reema, Ciena ie oe ew Wane y Mier rae ee Tere = storical st os esas rare ra barns Aca pre aR grater TAN Mcnea me Sere eS ee MET USEINGUCTERU SARE WAR Sis So late. Saale, ad altel aca teat case ee qa rh M el ety Se late 7) VR NR SD Mean OSUces ie VOM Peat GOUNDY «sa. ices Sie nicce sale la leah oc) « SSIS eee ausee te © Wo a6 PEGHOSIE OS ITE CITE OUTIN Vian vc tec gee act Paden Ree ooaytets eles etme ue te ldosha ne uEmey Rarely eiasir assert aemeiys 4o OUT YIR -u adh: wb recete vn el weep Ghd ev eta oe eels yee EWOSUrEsiD VLOnTZOMEry. © OUMb Yio. irk lel cieial The a sha alee o else We lee es TH ANOSUPeS Ih, VWerron: CONEY. Seats ole alow le nels weillelwovdoreUeshae a, oe ween wie wk Relationship to other formations................ LSE oases aaat Mento cack TP SLE OL (OAR pene atten Ob nM ne Ay ie ea, Src a ear Rh eee te rk Maman ae Lt REY het anlar Reg See Me SEEM RMGT can HONS val OLE bh geste pial ebokessr at oon a Mere alae he 6. auhan aly SOLTATIRIEN GLAS 2)ICS=) O07 |S eee ge Sy on Tr Ra Ee ge Ege ot ai ae ek Pe oe [ELSI ET CTH Ie ae Seen Rene Sab cy heer aR Pata ORC R tae CON as MRS tien LR ar hom cara mean a TROL Eva ST OE ee Sees ee ke eR eee rs, cee tee Pe rac a ee ec eR RCT CRETE] E211 61X 0 8 Meg Pie ee Sr ieee Arg Pee A cnn! Keo ata aa oat aca ake, won, hs oes USDOL GTEC \ OCOM TBD SPS coy b (eta Mata) wal SAP feo teats ae ein Pn Pree a ir eae eine ar er eee Genorc Column Northwest Ralls County... ge cc te ee ee ew ee MEP T UTC NE STIR CHEM ST ELESLES ee atetgs ounce Sco aie cers Biss afloat es, Se RT Oe a CHAPTER II. FAUNA OF THE MIDDLE DEVONIAN OF SOUTHEASTERN MISSOURI... Description of Species CHAPTER III, Introduction’: 56 oa. as Cher tar he etka orga a Varner at a ree Red Ore Tt I Tie Re te Pa Ve a Ta ee at aa Fe CHAPTER IV. Introduction Eee ieo OMG) (ert AGG ooo ladeaet. 7, cinibia se sees ole,d< isd Merete ses NORD deat cine ale a. chy petal ac DEVONIAN OUTLIER IN PHELPS COUNTY Boe ase Neate Vie Sw ble ele vl erm, WAL, ew 8 DONA HR 10. Sp op oTep Soe oe ILLUSTRATIONS. Facing page Generalized section of the Devonian series in Missouri........... ‘Wavede de rane 1 Devonian: outcrops in centrat Missouri ...1e2 ‘ . . i s . >* ¢ 7 / = > A - t . =e > : : : “ on he “ , + 4 > ‘ a te . . . Bho Aa: e case gl *. ar’ * . ’ _—s “ a 3 ps * bt Se i bet we? fs a Y Ha he WIL \\ i 7 ace SAT AANG | gual RAH Melee Sant ug iA te CHAPTER I. GENERAL ACCOUNT OF MISSOURI DEVONIAN. The Paleozoic in Missouri is represented by formations belonging to Cambrian, Ordovician, Silurian, Devonian, Mis- sissippian, and Pennsylvanian periods. The generalized geologi- cal column on page 1 gives average thicknesses of the various formations in northeastern Missouri where all periods are represented. The Devonian is the subject of treatment in this volume. | ; From Marion County in the northeastern part of the State to Pettis County west of the center nearly all of the numerous Devonian outcrops were investigated and form the basis for the discussion in this chapter. Limited outcrops of Devonian rocks occur in the southeastern part of the State, chiefly in Ste. Genevieve County. In Chapter II the author has described the fauna of the middle Devonian of this region while Chapters on the Bailey limestone by V. O. Tansey and on the Little Saline limestone by Grace Anna Stewart describe the general fauna of the lower Devonian. In Pennsylvania, Maryland, New York, and Virginia Devonian deposits are several thousand feet thick; in Ohio they reach a thickness of 2,000 feet or more; but they thin westward and no section in central Missouri is more than 100 feet thick. Moreover, in eastern United States the Devonian consists mainly of sandstones and shales, while in central Missouri it is mainly limestones. ; In New York, the type region for Devonian in America, it consists of several formations grouped into Lower, Middle, and Upper, and all divisions are well represented, while in central Missouri the Lower Devonian is not represented, al- though present in the ‘southeastern part of the State. The formations in other states are given in the following table with their equivalents in Missouri: (1) THE DEVONIAN OF MISSOURI. ‘Q0UaSqe OYROIPUT SOUT] [291910 A ‘s] Aopreg - EZ 2) ‘S| OUNTRS O1991T *s] iadooy a “ST B[OOUITAL woormdisde A | | | ‘S| JOMOJ, PUeID ‘sS STRPATLOG ‘sT AOTIVA IepsH aL 8 “sy AUMETIVO yoolO purpeems ‘ ny yoolD eury Ys yoorD siopAug Arrend 93249 LMOssijAl Ws9jysvoqynog IMosstyl [e19U8D “ST zosAo | ‘S[ sueurA00D ‘FJ pueyoog MON ‘J e190 ‘J UMA 410g “J AJOUUOD ‘J olmeue[D ‘J sndosq ‘J olueyoyos ‘ST eSepuoUg ‘YS SnyeoIe TAT “Ys woyyrure Fy ‘s] ATL “WSs 99soue+) ‘J o8e410g ‘J ZunweyD yIOX MON BMO] pus “TINOSSIJ[ ‘YIOX MONT JO SUONBUIIOJ UBIUOAAG 9} JO 9[qQe} UONVIeIIOD 319q19pl9H AUPYSIUIO 2nND SERIES, PLATE B. Vou. XVII, Missouri BuREAU OF GHOLOGY AND MINEs. ALID NOSH3443¢ tt H3aL3d 1s FF NVINOA Iq Paid SPS) ae Niayvors) aaa OOD SS bad ONT Ii yiNi@n\atG Y Ui; N eo) WN 17! \ Nid dISSISSIPy WY GENERAL ACCOUNT OF MISSOURI DEVONIAN. 3 The Devonian of central Missouri has rarely been mentioned in geological literature and its extent and relationships are known to few people. This is due in part to the inaccessibility of the outcrops. The exposures most easily reached are near Providence and Easley in Boone County, Lupus in Moniteau County, and Sweeney in Cooper County. They are in the bluffs of the Missouri River along the Missouri, Kansas and Texas, and Missouri Pacific railroads in Boone and Moniteau Counties, and along the Missouri, Kansas and Texas at Sweeney, but at the places mentioned the rocks are thin and only sparsely fossiliferous and have attracted little attention. Southward and eastward from Providence the Devonian outcrops retreat from the river bluffs and are only rarely within three miles of Missouri River. They occur in very rugged topography that is reached only with difficulty from the towns on the Missouri, Kansas and Texas Railroad. Furthermore, all of the towns are small, and the chance of geologists visiting in their vicinity is rare. The Wabash Railroad parallels roughly the Missouri River and the northern margin of Devonian out- crops, but it is in a nearly level country which rarely comes closer than five miles to the Devonian, and the country adjacent to it gives little promise to exploring geologists. South of the Missouri River the exposures near Lupus are limited in extent, thin, and sparsely fossiliferous. At Sweeney, about fifteen miles northeast of Sedalia, a good outcrop of Cooper occurs in a large quarry, but the rock is nonfossiliferous, and though Sweeney is well-known as a collecting place for - Chouteau fossils its Devonian exposures are little known and have never been mentioned in geologic literature. The Central Missouri Devonian outcrops occur from Pettis. County on the west to Marion County on the northeast. In Pettis, Cooper, and Moniteau Counties they are patchy and of small extent. In most cases they are in the bluffs of the larger streams and only rarely form the surface rocks over areas even a quarter of a mile in width. (The areas of outcrops shown on the small map (Plate F. a.) are greatly exaggerated.) From Boone County through Callaway, Montgomery and western Warren counties the Devonian exposures are almost continuous, but the formations are so thin that they only rarely make up an important part of the valley sides and usually the part taken by them is negligible. In central Callaway County where the main valleys are about one hundred feet deep and the 4 THE DEVONIAN OF MISSOURI. Devonian ‘averages sixty to seventy-five feet thick, the valley sides are in many cases largely made up of Devonian rocks. In central Warren County they are rarely present and where they ' occur form weathered slopes. From central Warren County to eastern Lincoln County Devonian rocks are absent and at the latter place they are only a few feet thick and occur in isolated patches. In Marion County, southwest of Palmyra, Salt River has cut down to the Devonian for a distance of a mile or two and the rocks do not occur more than twenty feet above the stream bed. In Ralls County near the town of Rensselaer, Devonian rocks outcrop over small.areas. The formations recognized in the region under discussion are: Snyder Creek shale (Craghead Creek shale of Greger) Callaway limestone Mineola limestone Cooper limestone The most easily accessible important Devonian outcrops are on Smith’s Branch, west of the Montgomery City-Danville road about four miles from Montgomery City, where for two or three miles down the creek the outcrops are good and both Callaway and Mineola are exposed. The most easily accessible outcrops of Snyder Creek shale are about six miles south of Fulton at the type locality of the formation, and Callaway limestone also occurs near the Snyder Creek outcrops. The outcrops of Cooper one mile south of Providence are better than occur in most places, those at Sweeney, mentioned in another paragraph, are good, and for two or three miles down stream from Sweeney they continue to be good. In northeastern Missouri the out- crops of Mineola near Rensselaer on the Wabash Railroad are good and are easily reached. UPPER AND LOWER BOUNDARIES OF THE DEVONIAN The upper and lower limits of the Devonian in Missouri have been placed at various horizons, but while the upper is still in dispute there is general agreement about the lower, owing to the large break between the oldest Devonian and youngest rocks beneath. In central Missouri the oldest Devon- ian rocks are Middle Devonian in age, and the youngest underlying rocks are older than the Niagaran of the Middle Silurian. The time interval between the youngest underlying rocks and the oldest Devonian probably ranges between three Missourt BuREAU OF GEOLOGY AND MINEs. Vou, XVII, 2npD Series, Puate C. I T55 gy | TO MIM DON ia, doe BAAR tad ueiots Bice -many species that are present in eastern Hamilton formations. The central Missouri sea was connected with the eastern United States seas during Mineola and most of the Callaway species survived from the Mineola or developed from the Mineola © species. The possible immigrants from the northwest by way of Iowa are Spirifer asper Hall, Cranaena towensis (Calvin), and Schizophoria striatula (Schlotheim). {t seems probable that central Missouri was at the south end of a bay that extended southward from Iowa and that eastern Missouri was a land barrier which kept out eastern immigrants. The Callaway is late Hamilton in age but may have been also, in part, contemporaneous with lower Tully. THE SNYDER CREEK SHALE Historical—In Callaway and Montgomery counties the Callaway limestone is overlain by a shale and limestone forma- tion ranging up to 63 feet in thickness. Gallaher first called attention to the formation in 1900 as follows: ‘‘Following im- mediately after the Hamilton limestone are the Snyder Creek Shales, another Devonian deposit which is limited almost ex- clusively to Callaway County. Plate 43 shows several important rocks, in their natural order of occurrence, but poorly developed.’’? The plate 43 is a photograph of the shales at their type locality on Craghead Creek. | Mr. D. K. Greger, who was Gallaher’s assistant, probably called his attention to the shales. Keyes mentions the Snyder Creek shales in several places in his articles on Missouri geology, and in 1909 Greger® gave the following brief description of them: “Structurally the Craghead Creek shale is readily divisible into three members; the lower portion made up of dark blue and 1U. S$. G. S., Bull. 210, p. 60. *Missouri Geol. Surv., vol. 13, p. 153. *Am. Jour. Sci., vol. 27, p. 375. ME Ca//avwa OOS [D1 Ca//lawe iy Seas ZA 1 ' Luis! S) tip Beat C3 ZACallaway Land Ps ere A Qyacl La 5 ADEE 5 1p ) A ae & vl? SNYDER CREEK SHALE. 37 drab shale, with interbedded bands of shaly limestone, highly fossiliferous; the middle member consisting of a light drab, argillaceous limestone with few fossils, mostly remains of Cri- noidea; the upper member consisting of a light gray, siliceous shale, this like the lower member being highly fossiliferous.”’ South of Fulton about six miles the formation is about 25 feet thick. He lists 34 species of fossils and indicates the species that are common to the Craghead and the Lime Creek shale and Cedar Valley limestone of Iowa. On account of the meagreness of Gallaher’s description and the lack of a Snyder Creek on maps of Callaway County, the writer had used Craghead Creek in preference to Snyder Creek, but a communication from Mr. David White gives the opinion of the committee on nomenclature of the United States Geological Survey that Snyder Creek has the better standing. In the interest of harmony the writer is adopting the name Snyder Creek. In 1860 Swallow! described several species of fossils from the Snyder Creek shale of Callaway County, but called the shales Hamilton. Relationships and Distribution.—The Snyder Creek seems to be conformable on the Callaway and has not been found resting on any other formation. It varies greatly in thickness and its extent is decidedly patchy, the latter being due to erosion pre- ceeding the advance of the Mississippian seas. Its entire extent is in Callaway and Montgomery counties and it probably is not greater than 200 square miles, while the area of outcrop probably does not exceed 50 square miles. _. The Snyder Creek shale was deposited in a narrow bay which extended southward from Iowa but did not reach much south of the Missouri River and seems to have been less than 50 miles wide at the south end. Though the formation reaches a thickness of 63 feet or more it rarely exceeds 25 feet and in many places is less than 10 feet. The map of Callaway and Montgomery counties shows its extent as accurately as our methods of mapping allowed. Greger called attention to the close relationship of the Snyder Creek fauna with those of the Lime Creek shale and Cedar Valley limestones of Iowa and the fossils listed and figured in this report emphasize the relationship with the Lime Creek 1St. Louis Acad. Sci., vol. 1, pp. 635-660. 38 THE DEVONIAN OF MISSOURI. shale; but close as it is, it does not warrant the reference of the formation to one of the Iowa formations. No rocks between Callaway County and the outcrops of the Lime Creek and Cedar Valley of Iowa are of the same age as the Snyder Creek and the gap is too large to bridge with present evidence. The best outcrops of Snyder Creek shale are in Callaway County, but even in this region of best development the forma- tion is absent over considerable areas. Its westernmost outcrops are near the Fulton branch of the Alton Railroad near New Bloomfield where the section is as follows. Section along the road: 13 miles‘east of New Bloomfield: Feet. Inches. Burlington Brown limestone capped with weathered limestone. Unconformity Sylamore sandstone Blue and yellow shale Green sandstone....... et ee er Me ro) oe ar ee adore ces 6 Unconformity Snyder Creek shale 1. White to buff, very fine-grained sandstone, in beds up to 8 inches thick which alternate with beds one to two inches thick of White: sandy shale. (len % sos cw Ebus Sun aiarne ott uke eee 5 2. Brown to bluish-brown sandy shale which weathers to yellowish brown. Some limestone nodules. Shale not in thin layers. Exposure too imperfect for accurate description............ 15 3. Nodular limestone interbedded with shale. All light gray weather- ing to light yellow. Stromatopora solidula Hall and Whitfield, Athyris fultonensis (Swallow), Atrypa reticularis (Linnaeus), Spirifer annae Swallow, Cyrtina triquetra Hall, Stropheodonta demissa (Conrad), Stropheodonta boonensis Swallow, Zaphrentis sp., Paracyclas elliptica Hall and Pleurotomaria isaacsi Hall and Whitfield: are conimon £0ssils, uo 3r. «<0 -eys1s ease eeeiaep 15 Total Snyder: Greels $6, 2524 Sos Os eet Oe ee 35 Callaway limestone Dark-blue limestones. f.¢ 50 so Ft. SEES eee eee se Sw tee aes 2 See ig 1 Yellowish gray shaly limestone...3: «0.5: ma cpice >) eee: oie eee 12 Snyder Creek shale at the type locality on Craghead Creek in SW%X% Sec. 17, T. 46 N., R. 9 W., six miles south of Fulton, Callaway County. The details were worked out by James S. Williams. Feet. Inches. Burlington limestone, gray crystalline limestone, which weathers to brown sandy texture, containing many crinoid stems, overlaid by brown sandy phase,of Burlington... tcc. te» a ele) ciate be oe Ree . 1 2 Sylamore sandstone: Greenish-brown friable sandstone. © 2.0.65 aw alta hha eee eae Sot eae 6 Hard dense light-gray to pink sandstone..:..:..........eceeeeceee 3% Snyder Creek shale: 1. Yellowish-brown sandy shale, very light where not weathered... 3 3 2. Drab to blue dense limy shale with several thin beds of shaly “limestone, in part sandy, containing many large, coarsely plicated Atrypa reticularis (Linnaeus) .............+eee000. 5 2 Se. “OOVERE os ee he Pe ee re it eee Marra aie aad eats ie aie ieee eS) ore 1 8 4. Blue to drab limy shale, somewhat sandy near top, containing - several species of Siropheodonta in abundance.............. 1 2 Missouri BuREAU OF GEOLOGY AND MINES. Vou, XVII, 2Np SERIES, PLATE H, Fig. b. Sylamore sandstone filling a cave in the Cooper limestone. . 3 “ . 4 . 4 ‘ a a i by i U “ yin Se rH 7 ‘ « : & » ; ; _ 3 Sit 4 - , 7 x , Pe 1 s i , - e COW CREEK SECTION. 39 ‘ Feet. Inches. 5. Dark blue to drab calcareous shale, abundantly fossiliferous, containing all Snyder Creek species of Siropheodonta...... a 1 4 eUEMEEEY INCE MeN PL, oT CTIA. ate ie wa werellas vine ERTS To ts tw, iw, «alee ate us oop sfc 3 7. Dark blue to drab calcareous shale, all of Snyder Creek Stropheo- donta species abundant, Lioclema occidens (Hall and Whitfield) SMNIVOIACE LANDS che che tran: ae heed cee CE Ale ce ee ice eee roe ae ee 1 i Pree MEINET Ul seer VOLOG? /\acct.t sb lelse > be ee Sle sere ule weve. sialevay Wak Sued ee a 3 6 9. Dark blue to drab calcareous shale, containing all of the Snyder Creek species of Stropheodonta in abundance and many large specimens on Or7noceras. 2. . 2.48 5. OSU nS oe eS 2 7 Total Snyder Creek measured...............0ecceveeecees 22 9 In this section it is impossible to determine the Snyder Creek-Callaway contact owing to the exposures being scattered for about one mile along the stream course. Below number 9 are thin beds of limestone and a sandstone which ranges up to five or six feet in thickness, but it was not determined whether the limestone and sandstone belong to the Callaway or Snyder Creek. . On Cow Creek, Sec. 23, T. 47 N., R. 8 W., the following section is exposed: . Feet. Inches. Burlington : Brown limestone which grades above into weathered materials. Unconformity Sylamore sandstone Peer OKO WH SAMGSUONO, (acts cpus ce eee tae bee t cibe ee ules ene ia 1 Unconformity Snyder Creek shale PSCC TL LOO TEMIOSUOTMIO. 5b 6. tas cle elec le eee ele eee eel obvi ele 1 -6 2. Highly fossiliferous brown sandy limestone, containing a great many Stropheodonta demissa (Comrad)..............0-0+055 1 .3. Brown sandy, calcareous shale containing many Spirifer euryteines Owen moesrtwepowsom,.<).Aic so aed ei Meps. alecid ekse s PAs lee es 4 4. Fossiliferous bluish-gray limestone, crowded with Spirifer eury- teines Owen, Stropheodontas and Schizophorias.............. 10 5. Blue shale, not well bedded, yields many pelecypods............ 3 The section is incomplete as number 5 ends in the bottom of the stream. About two miles down stream the shales are 50 feet thick, and the details of the shales at that place are given below: COW CREEK SECTION OF THE SNYDER CREEK SHALE The thickest section of Snyder Creek shale known to the writer is near the mouth of Cow Creek in Secs. 22 and 27, T. A7 N., R. 8 W. Owing to the nature of the shale the sections are not all exposed but almost complete sections were obtained by removing mantle rock from some surfaces. 40 THE DEVONIAN OF MISSOURI. Feet. Inches. Burlington limestone, brown sandy phase... ....:.sscese.e ne sedee wes we 4 4 Sylamore, gray to brown and green sandstone. ...:.......... ee eee eeeae 1 4 Snyder Creek shale. 1. Brown sandstone grading to brown sandy limestone below. - All very porous. Bears Chonophyllum ellipticum Hall and Whit- field, Stropheodonta demissa (Conrad), Schizophoria striatula (Schlotheim) and Spirifer euryteines Owen...............:. 1 10 Hackly thin-bedded, sandy limestone, drab, weathering to yellow. 1 3 Sandy limestone weathering into thin yellowish-brown layers. Original color brown. Crowded with Schizophoria striatula (Schlotieirtyi,. oo. ys. ors Steteae sah esaatad ode on 1 4 (Almost 100 yards from the above the top 4’ 3” is a rather : homogeneous brown sandy limestone. In places crowded with Chonophyllum ellipticum Hall and Whitfield, Stropheo- donta demissa (Conrad). At the top it grades without break into a green sandstone. ) 4. Mainly gray to brown shale, in some nae greenish. A few very thin, béds6f sandstone a; sex aiden he s ee Bo gered 38 5 5. Limestone and shale interbedded, mainly limestone, drab to bluish- gray, 2 inches very compact fine-grained limestone at the top oll which weathers out in taree slabs. pb sus seed a ho we keke seen 4 6 67 7*Binish-rray LIne y- Sale yk cee fee elem oie Dern eer ete. eerie oe 2 6 otal snyder Oreckishale,,cs4 sete ONte eae ae ee ee ce 49.) ae Callaway, blue hackly limestone with very dark spots making up about half the mass, This section is about two miles west of the Cow Creek section given on page 39. Only the top of the Snyder Creek is exposed in the other section and the shales as described there are much like the number 4 of this section. ~ The New Bloomfield section as given on page 38 LiGks the ‘top part of this section. ; The section on Craghead Creek as given on page 38 lacks all but the lower 23 feet of this section. An isolated outcrop a few acres in extent is found north of Bluffton in Montgomery County. At this place the formation is about 20 feet thick and consists of purple limestone and shale. It rests on Callaway, which is only a few feet thick, and is overlain by the Burlington. Fossils occur in abundance, Spirifer euryteines Owen being particularly abundant. On the Montgomery City-Danville road, four miles south of Montgomery City, a yellowish sandy shale, of which about 8 feet is exposed, outcrops west of the road on the south side of Smith’s Branch, and this is the most easterly outcrop on the north margin of the Snyder Creek shale. . The most northerly outcrops are on Whetstone Creek, 7 miles northwest of Williamsburg, where the shales occur in only a few places and are not over 10 feet thick at any place. The Snyder Creek shale is overlain unconformably by Sylamore sandstone over most of its extent, but Chouteau limestone, Burlington limestone, and Cherokee shale are occa- SNYDER CREEK SHAIE. 41 sionally in contact with it. Its surface was deeply eroded before the earliest Mississippian seas advanced though the relief of the surface of the entire area over which it occurs was not greater than 150 feet. The Sylamore sandstone often fills valleys with sides of Snyder Creek shale and bottom of Callaway limestone or older rock. At the type locality, Sylamore, a few inches to 2 feet thick, is the overlying rock. Paleontology.—Fossils are abundant in several members of the Snyder Creek shales but several members are not fossiliferous. _ The faunules are decidedly different at different localities and in different members at the same locality. Stromatopora solidula Hall and Whitfield seems to occur in only one member about 15 to 25 feet from the bottom. Spirifer annae Swallow is present in the same member and not below or above. Lioclema occidens (Hall and Whitfield) is abundant near the bottom and is rare above the middle. Pelecypods are abundant in the upper 15 feet. The following is a list of all of the indentifiable fossils from the Snyder Creek that the writer has seen. Greger’s list!, published in 1909, was preliminary. Sevéral differences between that list and the present resulted from differences in identifications. Greger’s species Acervularia profunda Hall, Gypidula comis.Owen, and Philhedra crenistriata Hall, the writer has not seen. 3 _ LIST OF SPECIES FROM THE SNYDER CREEK SHALE Coelenterata Aulopora repens Knorr and Walch (c) Ceratopora snyderensis Branson (r) Chonophyllum ellipticum Hall and Whit- field (a) Hydrozoa . Stromatopora solidula Hall and Whit- » field (a) Crinoidea _ Dactylocrinus concavus (Rowley) (r) Melocrinus gregeri Rowley (r) Melocrinus lylii Rowley (r) Melocrinus tersus Rowley (r) Bryozoa Lioclema occidens (Hall and Whit- field) (a) ; Rhombopora missouriensis Branson (a) Brachiopoda Athyris fultonensis (Swallow) (c) Albrypa gregeri Rowley (r) 1Am, Jour. Sci., vol. 27, pp. 376-377. Airypa reticularis (Linnaeus) (a) Altrypa spinosa Hall (a) Camarotoechia depressa Kindle (r) Camarotoechia gregeri Branson (r) Cranaena calvini (Hall and Whitfield (r) Crania famelica Hall and Whitfield (c) Cyrtina triquetra Hall (c) Orbiculoidea sp. (r) Pentamerella missouriensis Branson (r) Productella callawayensis (Swallow) (c) Pugnoides alius (Calvin) (r) Schizophoria striatula (Schlotheim) (a) Schuchertella arctostriata (Hall) (r) Spirifer annae Swallow (c) Spirifer euryteines Owen (a) Stropheodonta boonensis Swallow (a) Stropheodonta callawayensis Swallow (a) Stropheodonta ‘cymbiformis Swallow (a). Stropheodonta demissa (Conrad) (a) Stropheodonta equicostata Swallow (a) 42 THE DEVONIAN OF MISSOURI. Stropheodonta inflexa Swallow (c) Euomphalus cf. hecale Hall (r) Stropheodonta navalis Swallow (c) Pleurotomaria isaacsi Hall and Whit- Strophonella crassa Rowley (r) field (c) Vermes Cephalopoda Spirorbis omphaloides (Goldfuss) (c) Cyrtoceras sp. undet. (r) - Pelecypoda Nautilus lawsti Swallow (r) Clinopistha? rowleyi Branson (c) ’ Orthoceras atreus Hall (r) Goniophora hamiltonensts (Hall ) (r) Orthoceras sp. undet. (r) Grammysia elliptica Hall (r) Orthoceras sp. undet. (r) Modiomorpha missouriensis Branson (r) Trilobita Nucula cf. lirata (Conrad) (r) — Proetus crassimarginatus Hall (r) Nucula snyderensis Branson (r) Pisces Paracyclas elliptica Hall (a) Glyptaspis sp. (r) Paracyclas lirata (Conrad) (a) : Ptyctodus calceolus (ewbersy and Wor: Schizodus chemungensis (Conrad) (a) then) (c) Gastropoda Ptyctodus ferox Eastman (r) Bellerophon sp. \r) Diaphorostoma snyderensis Branson (a) The most abundant species are: Athyris fultonensis (Swallow), Lioclema occidens (Hall and Whitfield), Stropheodonta callawayensis (Swallow), Stropheodonta boonensis (Swallow), Stropheodonta equicostata Swallow, Stropheodonta demissa (Con- rad), Schizophoria striatula (Schlotheim), Spirifer euryteines Owen, Stromatopora solidula Hall and Whitfield, Paracyclas elliptica Fall, and Chonophyllum ellipticum Hall and Whitfield. Four of the species came up from the Callaway and the others migrated into the Snyder Creek seas or originated there. The fauna is decidedly different from that of the Callaway though the Snyder Creek deposition was continuous with that of the Callaway. Several species, abundant in the Callaway, do not appear in the higher formation. Among these are Acervularia davidsoni Edwards and Haime, Favosites alpenensis Winchell, Cyrtina missouriensis (Swallow), Craenena iowensis (Calvin), and Newberrya missouriensis Swallow. Anthozoa.—Two species of corals are abundant. Aulopora repens Knorr and Walch, an abundant form, is widespread in the Hamilton and Upper Devonian of eastern United States and is probably present in the Lime Creek of Iowa. Chonophyllum ellipticum Hall and Whitfield is very abundant. It occurs also in the Cedar Valley formation of lowa and in the Upper Devonian of the Mackenzie Valley. Ceratopora missouriensis Branson, a rare species, is closely related to Ceratoporas of the eastern Hamilton and Onondaga. Stromatoporoidea.—Stromatopora solidula Hall and Whit- field is a very abundant form, which occurs in no other forma- tions save the Lime Creek of Iowa. ee ee ~ SNYDER CREEK SHALE. 43 Crinoidea.—Crinoid remains are very rare. The species of Melocrinus are all distinctive, but they have been found in only one locality. No crinoid heads have been collected from the Callaway though the stems are abundant. Melocrinus may be present in the Callaway, though the stems and fragments sug- gest Megistrocrinus or Dolatocrinus. Melocrinus gregeri Rowley occurs in the Iowa Devonian and a thorough study of the crinoids from Iowa may show the presence of other Snyder Creek species. Vermes.—Spirorbis omphaloides (Goldfuss) is the only worm identified in the faunas. It is found from bottom to top of the formation but is not abundant. Bryozoa.—Lioclema occidens Hall and Whitfield is very abundant in one member in the lowest ten feet and ranges to the top of the formation. Rhombopora missouriensis Branson largely makes up one thin bed of limestone in the lowest ten feet of the formation. Brachiopoda.—The brachiopod. species are the most im- portant in the faunas. Twenty-seven species have been identi- fied. Stropheodonta is the most important genus. Stfropheodonta demissa (Conrad) is present in the Mineola and Callaway and in the Snyder Creek it changes very rapidly, giving rise to six other species within ten feet of the bottom. The new species are abundant in 10 to 15 feet of strata, then dwindle in 10 to 15 feet of strata, and seem to be absent from the highest 20 feet. The variations are in the direction of longer hinge-line and shorter hinge-line; coarser plications and finer plications; great convexity and flatness; narrow umbo and broad umbo. Specimens are very abundant and show all phases of the varia- tions. After the stropheodonts Spirifer euryteines Owen is the most characteristic brachiopod. Near the top at the Cow Creek locality it is very abundant. Schizophoria striatula (Schlotheim) is as abundant as Spirifer euryleines Owen, but its wide distribu- tion in other formations makes it less characteristic. Cyrtina triquetra Hall is common at the New Bloomfield locality in the bottom member but is rare in other places. Spirifer annae Hall is common in the same member as C. friquefra Hall. Athyris fultonensis Hall is common in many localities and abundant in some. Afrypa reticularis (Linnaeus) is one of the most abundant forms and has many varieties. Spirifer asper Hall is listed on the authority of D. K. Greger.! 1Am., Jour. Sci., vol. 27, p. 376. 44 THE DEVONIAN OF MISSOURI. Pelecypoda.—Pelecypods are abundant near the top of the formation, especially in the Cow Creek locality. Paracyclas elliptica Hall is the most abundant form. Modiomorpha mis- sourtensis Branson and Schizodus chemungensis (Conrad) are also abundant. Goniophora hamiltonensis (Hall) is a significant form, though rare, on account of its occurrence in the Hamilton and Upper Devonian of the eastern part of the United States and Canada. Below the upper fifteen feet of the formation pelecypods are rare. Gastropoda.—Diaphorostoma snyderensis Branson is the only abundant gastropod and it is abundant in only two mem- bers of the lower half of the formation. Pleurotomaria isaacsi Hall and Whitfield is significant on account of its occurrence in both the Snyder Creek and Lime Creek formations. Cephalopoda.—The cephalopods are too poorly preserved and rare to be a significant element in the funa. — Trilobita——Only one specimen of trilobite, a pygidium, has been collected, and its identification is uncertain. Pisces.—Fishes are generally rare. Ptyctodus calceolus Newberry and Worthen is a common form which ranges from Mineola to basal Mississippian in Missouri. Only two speci- mens of Ptyctodus ferox Eastman have been collected. Glyptaspis is too fragmentary to be identified specifically and only one specimen has been collected. Fragments of three or four other species of dinichthyids have been collected. Correlation—The Snyder Creek faunas indicate a more or less isolated sea during most of the epoch. One of the closest relationships of the fauna is with the Lime Creek faunas of Iowa. Fenton! lists about 100 identified species from the Lime Creek and only 12 of these occur in the Snyder Creek. 53 species have been identified from the Snyder Creek and 12 of these occur in the Lime Creek. Lioclema occidens (Hall and Whitfield) and Stromatopora solidula Hall and Whitfield form the closest tie between the Lime Creek and Snyder Creek as both are abundant forms that oc- cur in no other formations. Chonophyllum ellipticum Hall ond Whitfield also is confined to the two formations. The following is a complete list of the species common to the two formations: 1Am, Midland Naturalist, vol. 6, pp. 188-197. EE EEE ee ae SNYDER CREEK SHALE. 45 Chonophyllum ellipticum Hall and Whit- Pugnoides altus (Calvin) field Cranaena calvini (Hall and Whitfield) Stromatopora solidula Hall and Whitfield Aérypa reticularis (Linnaeus) Spirorbis omphaloides (Goldfuss) Atrypa spinosa Hall Lioclema occidens (Hall and Whitfield) Paracyclas ellaptica Hall Crania famelica Hall and Whitfield Ptyctodus calceolus Newberry and Worthen _ Schizophoria striatula (Schlotheim) The Iowa fauna is characterized by an abundance of signifi- cant spirifers and none of these is in the Snyder Creek shale. The Snyder Creek fauna is peculiar on account of its large variety of stropheodonts, none of the new species of which occurs in the Lime Creek. The Snyder Creek sea and Lime Creek sea were probably contemporaneous but were not directly or continuously connected. ; Eleven of the Snyder Creek species are found in the Mil- waukee formation of Wisconsin. The following are the species as listed by Cleland. Aulopora repens Knorr and Walch Schizophoria striatula (Schlotheim) Spirorbis omphaloides (Goldfuss) Nucula lirata (Conrad) Atrypa reticularis (Linnaeus) Paracvelas elliptica Hall Athyris fultonensis (Swallow) Paracyclas lirata (Conrad) Spirifer euryteines Owen Ptyctodus calceolus (Newberry and Wor- Spirifer asper Hall then). 3 Cleland correlates the Milwaukee formation with the Hamilton of New York. The seven Snyder Creek species in the following list are given by Whiteaves from the Devonian of the Mackenzie River.? Atrypa reticularis (Linnaeus) _ Schizophoria striatula (Schlotheim) Aulopora repens Knorr and Walch Spirorbis omphaloides (Goldfuss) Chonophyllum ellipticum Halland Witfield — Stropheodonta demissa (Conrad) Schizodus chemungensis (Conrad) Euomphalus inops Hall of the Mackenzie region may be the same as the Snyder Creek Euomphalus hecale Hall. Thirteen of the Snyder Creek species are listed by Stauffer,’ from the Hamilton of Ontario, but none of these is significant for correlation purposes. Nine of the Snyder Creek species are listed from the Upper Devonian of Maryland‘, and a larger number occurs in the Upper Devonian of New York but the relationship of the Snyder Creek BAe ewieronsin Geol. Nat. Hist. Surv., Bull. 21, pp. 12-21. 2Contributions to Canadian Paleontology, vol. 1, pt. 3, pp. 250-251. *Canada Geol. Surv., Memoir 34, pp. 229-237. ‘Maryland Geol. Surv., Devonian, Middle and Upper. 46 _ THE DEVONIAN OF MISSOURI. fauna to any one Upper Devonian fauna of Eastern United States is not close. . The Snyder Creek fauna is, largely, a development from the Callaway fauna which preceeded it and which lacked most of the Eastern Hamilton species. There is not an immigrant from the eastern seas in the fauna. The formation should’ _probably be correlated with the Tully or Genessee of New York but the evidence of the fossils does not indicate one of these more than the other. Geologic Column South of Fulton in Callaway County* Ponnsyivanian.... sce etek oon Cherokee shales. .......... Lea hatetecaiars tore food 100’ WUSSiGsI DRAM cic he calves phases Burlington: Hmestones: - 4. sons askew eon dees 100’ Pylamore sandstone te hs ews oie sat ete wee les a? DOVONIAN f. 4. ek ne eer ince Rese Suyoer Creek shale: .. << sues ns oe. eens 40’ Callaway limestone. « : ANTHOZOA. 51 best specimens have no secondary septae. In some specimens the dissepiments unite in one row to form a sort of secondary wall and from this minute secondary septae develop. In some cases the inner ends of the spetae unite to form an inner wall but in many speci- mens the wall is imperfect as though disarranged. Near the outer ends of the corallites the septae become disarranged as shown in figure 3. Dissepiments are well developed but not numerous, usually 3 to 5 between adjoining septae, but more numerous out- ward. The outer surface has no pronounced annular constrictions but has well-developed septal furrows. In some respects this species appears more like Craspedophyllum Dybowsky than Diplophyllum Hall. However, the septae are not carinate. It differs from most species of both genera in not having well-developed secondary septae. Occurrence—Callaway limestone of Boone and Callaway Counties. Genus Chonophyllum Edwards and Haime Chonophyllum ellipticum Hall and Whitfield Plate 1, figures 2-5; plate 2, figure 6. 1873. Chonophyllum ellipticum Hall and Whitfield, 23rd. Ann. Rept., N. Y. State Cab. Nat. Hist., p. 233, pl. 9, fig. 13. 1891. Campophyllum ellipticum Whiteaves, Contr. to Canadian Pal. I, pt. III, p* 202, pl. X XVII, figs. 5-6. 1892. Chonophyllum ellipticum Sherzer. A revision and monograph of the genus Chonophyllum, Geol. Soc. Am., vol. 3, pp. 269-270. Hall and Whitfleld’s description—‘‘Coral small, subturbinate, laterally compressed, and much distorted in growth; rays somewhat strongly developed and numerous very slightly twisted as they approach the center of the cup. Calyx shallow, with rapidly ascending sides in young specimens, and spreading nearly horizontally toward the margin in older forms.. Exterior of the body covered by a continuous epithecal coating, increasing in strength from below upward. Ina vertical section the infundibuli- form cups are somewhat distant, broad at the base, with rapidly ascending sides; the spaces between them, and also between the rays, are filled with numerous irregular, cystose partitions. The distinctive features of this species consist in its elliptical outline and dis- tinctly marked rays. There may be some doubt as to its generic relations. The rays are very slightly twisted as they approach the center of the cup, but there is no ap- pearance of a columella. The great development of the rays, and the continuous epithe- cal coating, are features which pertain more particularly to Ptychophyllum than to Chonophyllum.”’ Remarks—This species is abundant in some parts of the Snyder Creek shale and it also occurs in the Callaway limestone. The preservation is always imperfect. Figure 6 of plate 2 represents the septae imperfectly. They extend to the edge of the calyx but are much worn in the specimen figured. The septae are twisted near the center but do not form a columella. Stromatopora solidula Hall and Whitfield incrusts many of the Snyder Creek specimens. 52 THE DEVONIAN OF MISSOURI. Fig. 3. Sections of Chonophylum ellipticum Hall. 1. A vertical section of a corallite from the bottom of the cup to two centi- meters below the bottom. (X3/2.) 2. A cross section 4 centimeters below the margin of the cup of the specimen figured on plate 1, fig. 2.. This section corresponds to a place about one-third the distance from the bottom of figure 1. (X3/2.) Section of Diplophyllum callawayensis Branson 3. A cross section about 4 centimeters from the base. (X3/2.) Genus Acervularis Schweigg Acervularia davidsont Edwards and Haime Plate 4, figures 9 and 10. 1851. Acervularia davidsoni, Edwards and Haime, Polyp. Foss. des. Terr. Palaeoz, p. 418, pl. 9, figs. 4, 4a and 4b. 1858. Acervularia profunda Hall, Geol. Surv. Iowa, I, pt. 2, pp. 477-478, pl. 1, figs. (iez el oe wee 1858. Acervularia davidsoni? Hall, Geol. Surv. Iowa, I, pt. 2, pp. 476-477, pl. 1, figs. 8, a, b. ae 1876. Cyathophyllum davidsoni Rominger, Geol. Surv. Michigan, III, pt. 2, p. 10%, pl. 37, fig. 4. 1885. Cyathophyllum davidsoni Davis, Kentucky Fossil Corals, pt. 2, pl. 93, fig. 2; pl. 113, fig. 3. 1892. Acervularia davidsoni Calvin, Am. Geologist, vol. 9, pp. 355-358. 1894. Acervularia davidsoni Keyes, Pal. Missouri, pt. 1, Mo. Geol. Surv. IV, pp. 104- 105. 1900. Acervularia davidsoni Lambe, Cont. to Canadian Pal. IV, pt. 2, pp. 164-165, pl. 14, fig. 3. 1909. Acervularia davidsoni Grabau and Shimer, North American Index Fossils, I, p. 69, fig. 106. 1911. Acervularia davidsont Cleland, Wisconsin Geol. Nat. Hist. Surv. Bull. 21, p. 30, pl. 1, figs. 3 and 4. 1918. Acervularia davidsoni Branson, Geology of Missouri, pp. 100-101, pl. 3, fig. 8. Hall's description—“Coral astraeiform, subhemispheric; cells irregularly polygonal, unequal in size, often somewhat circular in the young and half-grown conditions; walls thin, scarcely undulating; inner wall undefined, cup abruptly and deeply depressed from a little within the outer wall; centre marked by a papilliform mode.” Calvin's description—‘‘The calyces have a sharply defined central pit with explanate margins. In typical specimens the floor of the calyx, except in the central pit, is almost I ANTHOZOA. ' 53 on a level with the margin; the septa are thick, scarcely denticulated, with but a small portion of their edges free; the carinae are few and clumsy and chiefly developed in the region immediately surrounding the central area. Around the edge of the central area both primary and secondary septa are conspicuously thickened, the carinae are also developed there better than elsewhere, the effect being to produce in polished sec- tions the appearance of a bi-areal coral with a central area bounded by a definite inner wall. Under the magnifier this wall is never complete. The thickened septa and strongly developed carinae never quite coalesce, so that the outer area is never, as in true bi- areal corals, perfectly shut off from the central space. At the margin of this central space the secondary septa all end more or less abruptly, and only the primary septa are continued as thin non-carinated lamellae into the central area.” Remarks—The species is abundant at one horizon in the Callaway limestone and is common in the Mineola limestone. The range in form seems to be as large as between Acervularia profunda and Acervularia davidsoni from the Iowa Devonian. Subclass Hexacoralla Order Madreporaria Suborder Tabulata Family Favositidae Genus Favosites Lamarck Fig. 4. Sections of Favosites alpenensis Winchell 2. Cross section near the base where the walls are thick. (X5.) 3. Vertical section where the walls are thin. (X5.) (Mineola limestone of Ralls County) Sections of Favosites sp. undet. = Vertical section (X5) 4. Section to show arrangement and size of pores. (X5.) (Devonian of Callaway County, formation uncertain) Favosites alpenensis Winchell Plate 2, figures 1-3. 1866. Favosites alpenensis Winchell, Rep. Lower Pen. of Michigan, p. 88. 1876. Favosites hamiltonensis Rominger, Geol. Sur. Mich., Foss. Corals, p. 28, pl. VII, figs. 3.-and 4. 1892, Favosites gothlandica Whiteaves, Contr. to Can. Paleon., vol. I, pt. IV, p. 272. 54 : THE DEVONIAN OF MISSOURI. 1899. Favosites alpenensis Lambe, Contr. to Can. Paleon., vol. IV, pt. I, p. 18. 1909. Favosites alpenensis Grabau and Shimer, North American Index Fossils, I, p. 87. 1911. Favosites alpenensis ? Cleland, Wisconsin Geol. Surv., Bull. 21, p. 31, pl. I, fig. 8. j Lambe’s description—‘‘Corallum massive, irregular in shape, attaining sometimes a diameter of about 1 foot with a height or thickness of 4 or 5 inches. Corallites prismatic, unequal in the same specimen, varying from 1 to 2.5 mm. in width. Pores of moderate size, about .25 mm. in diameter, occurring generally in one row, though sometimes in two rows in the sides of the corallites. A slightly raised margin is seen round many of the pores but this is evidently not a constant character as very frequently the edges of the pores are quite plain or even slightly depressed when weathering would not ac- count for the change. Tabulae complete, horizontal, at times slightly concave or convex; frequently exhibiting marginal depressions. Squamulae few in number, rather small, narrow and rather short, extending only a short distance into the corallites. Inner surface of corallites faintly striated longitudinally. This species is distinguishable from other Devonian Favosites principally by the size of the corallites whose sides have most frequently only one row of pores and by the fewness and small size of the squamulae as well as the large number of well developed tabulae.” Remarks—Modal corallites of the Missouri specimens are about 1.3 mm. in dia- meter. The tabulae average about .5 mm. apart but some are more than a millimeter apart. The ordinary size of Missouri specimens is 8 to 12 cm. in diameter. Occurrence—The species.is abundant at one horizon in the Callaway and it also occurs in the Mineola and Cooper. Favosites limitaris Rominger Plate 3, figure 1. 1876. Favosites limitaris Rominger, Fossil Corals, Geol. Surv. Michigan, vol. III, He: 2, p. 30, ple 13. 1883. Favosites limitaris Hall, Indiana Dept. Geol. Nat Hist., 12th Ann. Rept., pp. 256-257, pl. 4, figs. 5, 6. 1885. Favosites limitaris Davis, Kentucky Fossil Corals, pl. 30; pl. 31, fig. 1. 1909. Favosites limitaris Grabau and Shimer, North American Index Fossils, I, p. 88, fig. 142. Rominger's description—‘‘Ramified and reticulated stems, from five to fifteen millimeters in thickness, forming horizontally explanate expansions or erect fruticose ramifications. Tubes very thick-walled, opening nearly rectangularly to the surface, with circular orifices, the walls forming either a solid, undefined interstitial mass, or in another state of preservation, the polygonal outlines of each tube are visible on the surface of the interstices as delicate engraved lines. Several varieties are observed in regard to the mode of growth and the size of tubes. The tube orifices rarely exceed the diameter of one millimeter; often they are smaller, and in some forms they are all equal in a specimen; others have smaller and larger orifices intermingled. A part of the orifices on the side faces of the stems are often found closed by opercula, situated below the outer edge of the channels; in the interior parts of the tube channels diaphragms are not regularly developed, and are of rare occurrence. ‘Pores, large, distant, and irregularly dispersed. In older stems the tube channels not unfrequently become con- siderably narrgwed by excessive incrassation of the tube walls, while the pore channels gain in length and width, and appear on the surface as vermicular, transverse channels connecting the tube channels, which later are, in their narrowed condition, hardly larger than the connecting pore channels.” Remarks—This species is common in the Callaway limestone associated with Acervularis davidsoni Edwards and Haime. It occurs also in the St. Laurent of Ste. ee ee : ANTHOZOA. 55 Genevieve County. As with many Devonian corals the figures and specific descriptions are incomplete and without comparison with the types specific identification is somewhat uncertain. Figures 3 and 4 show the structures inside the tubes of a Callaway lime- stone specimen. Rarely tabulae cross the tubes. About 12 spines appear in some cross sections. ~ 4 Fig. 5. Sections of Ceratopora snyderensis n. sp. 1. Cross section (X2%). 2. Vertical section (X214). (Snyder Creek shale of Callaway County.) Sections of Favosites Limitaris Rominger. 4. Vertical section of an ordinary specimen showing spines (X10). 3. Cross-section of ordinary corralites showing spines. Some of the spines are cut diagonally so that they do not show connection with the walls. (X10.) Family Auloporidae Genus Aulopora Goldfuss Aulopora repens Knorr and Walch Plate 4, figure 4. 1775. Melliporites repens Knorr et Walch, Rec. des mon. catastr. t. III, p. 157, sup. pl. 6, fig. 1. : 1829. Aulopora serpens Goldfuss, Petref. Germ., vol. I, p. 82, pl. 29, fig. 1. 1857. Aulopora repens Milne-Edwards and Haime, Po]yp. Foss. des Terr. Pal., p. 312. 1876. Aulopora serpens Rominger, Geol. Surv. Mich., III, pt. II, pp. 87-88, pl. 33, fig. 2. 1911. Aulopora serpens Cleland, Bull. 21, Wisconsin Geol. Nat. Hist. Surv., p. 34, pl. 2, fig. 4. 1913. Aulopora repens Clarke and Swartz, Maryland Geol. Surv., Middle and Upper : Devonian, p. 542, pl. 45, figs. 10, 11. - Clarke and Swartz's description—‘‘Corallum tubular, prostrate; branching from buds which originate below calyx; dichotomous, or branches anastomosing to produce a loose meshwork. Branches funnel-shaped, attached throughout. their length to other organisms, especially to brachiopods. Calyx funnel-shaped, directed upwards. Tab- ulae and septa absent. Diameter of branches at calyx 2 mm.; at base 1 mm.; length of branches 3-5 mm.” Remarks—Aulopora repens is. of common occurrence in the Snyder Creek shale and is nearly always on Stropheodonta demissa or Stropheodonta callawayensis. — 56 THE DEVONIAN OF MISSOURI. Genus Ceratopora Grabau Ceratopora grabaui n. sp. Plate 4, figures 2 and 3; plate 3, figure 5. Corallum maintaining about the same width with upward growth; tubules closely aggregated, spreading in various directions so that the outer points of a cross-section of a corallum lie in a rude circle. Corallites closely connected through their entire length, maintaining about the same diameter. The diameter of the tubes is 114 to 2 mm. No pores have been observed in the walls and no spines in the tubes. In some cases the entire corallum bifurcates several tubes going with each branch, branches of about the same size. Figure 3 of plate 4 shows sucha branching. Figure 5 of plate 3 shows the central mass with the tubes broken away. Occurrence—Mineola limestone.of Montgomery and Ralls Counties. Ceratopora snyderensis n. sp. Plate 3, figure 2 Corallum. simple, unattached excepting at the base. Corallites slightly curved and gradually enlarging toward the circular aperture. In the two specimens on which the description is based the first bud is given off 8 mm. from the base. The second bud ‘is 12 mm. higher than the first. The buds are almost at right angles to the main coral- lite. Interior with circumferential cysts. Cysts few but of large size. Septal spines few, of medium size. This species differs from Ceratopora jacksoni Grabau in its smaller size and lack of longitudinal striations. Occurrence—Snyder Creek shale of Callaway County. Class HYDROZOA Subclass Hydromedusae Family Stromatoporoidea Genus Stromatopora Goldfuss Stromatopora solidula Hall and Whitfield Plate 4, figure 1; plate 5, figures 1-6. 1873. Stromatopora solidula Hall and Whitfield, 23d Ann. Rept. N. Y. State Cabinet of Nat. History, p. 227, pl. 9, fig. 4. Hall and Whitfield’s description—‘‘Specimens in irregular masses, or incrusting foreign substances, the form of which they frequently retain. Surface extremely irregu- lar and more or less thickly covered with small conical or rounded irregularly disposed pustules, giving origin to minute, indistinct, flexuous, ramifying channels, which traverse their sides and the intervening spaces, seldom extending to any great distance. Vertical section showing closely arranged horizontal layers of varying density, giving a strongly lamellose appearance; the individual plates or vertical columns scarcely or not at all distinguishable, but showing the ramifying tubes of different sizes very distinctly.” _Remarks—This is an exceedingly variable form frequently occurring in nodules of, various. sizes and not uncommonly incrusting other forms. Over large surfaces there may be no pustules while other surfaces may have pustules closely crowded. The sub- . stance is so dense that structure has not been satisfactorily. determined in microscopic: sections. The peculiar ornamentation shown in the drawing is a conspicuous feature | of all good specimens. The slightly weathered specimens show no trace of them. Occurrence—Abundant near the bottom of the Snyder Creek shale in Callaway County. Locations 1 and 2 are good collecting grounds. ay Sy" 1833. 1874. 1891. 1911. W713; ANNELIDA. 57 VERMES Class ANNELIDA Subclass Chaetopoda Order Polychaeta Suborder Tubicola Genus Spirorbis Lamarck Spirorbis omphaloides (Goldfuss) Plate 6, figures 9 and 10. Serpula omphalodes Goldfuss, Petref. Germ., vol. 1, p. 225, pl. 68, fig. 3. Spirorbis omphalodes Nicholson, Rep. Paleont. Prov. Ont., p. 121, fig. 54a. Spirorbis omphalodes Whiteaves, Cont. to Canadian Pal. I, pt. 3, p. 209, pl. 28, figs. 3, 4, 4a, 5 and Sa. Spirorbis omphalodes Cleland, Wisconsin Geol. Nat. Hist. Surv., Bull. 21, p. 46, pl. 4, figs. 3, 3a. Spirorbis omphalodes Hinde Zittel’s Textbook of Paleontology (Engl. ed.), vol. 1, 2nd ed., fig. 219. Whiteaves’ description—‘‘In small specimens the outer volution is rounded and somewhat depressed and the umbilicus usually, though not always, comparatively wide. In large individuals the outer volution is elevated and subangular and the umbilicus narrow. The surface is usually smooth or nearly so, but in some specimens which seem to be nearly intermediate between this species and the next, the umbilical margin is seen to be distinctly plicated, when examined under a lens.” Remarks—Specimens are common in the Snyder Creek shale, but they are usually in poor condition. The sub-angular condition of the outer volution is not apparent. ECHINODERMATA Class BLASTOIDEA Order Eublastoidea Family Nucleocrinidae Genus Nucleocrinus Conrad Nucleocrinus verneutli (Troost) Plate 8, figures 3 and 4. 1841. Pentremites verneuili Troost, 6th Report Geol. State Tenn., p. 14. 1849. Pentremites verneuiliit D’Orb., Prod. Pal. Strat, I, p. 102. 1849. Olivanites verneuilt Troost, Am. Jour. Sci., VIII, p. 419. 1850. Olivanites verneutlii Troost, Proc. Am. Assoc. Adv. Sci., for 1849, p. 62. 1851. Elaeacrinus verneuilii Roemer, Archiv f. Naturgesch, Jahrg. XVII, Bd. i, p. 379, pl. 8, fig. 1, a-d. 1857. Olivanites verneuilii Lyon in Owen's 3rd Report Geol. Survey Kentucky, pp. 487-492, t. 5, f. 1, a-e. 1857, Pentremites verneuijii Shumard, Trans. St. Louis Acad. Sci., I, p. 247, 58 THE DEVONIAN OF MISSOURI. 1852-54. Elaeacrinus verneuilii Roemer in Bronn’s Lethaea Geogn., Dritte Aufl Theil II, p. 284, 4. f. 10, a and b. 1859. Nucleocrinus verneuili Lyon and Casseday, Proc. Am. Acad., IV, p. 295. 1859. Elaeacrinus verneuili Bronn, Klassen und Ordn. Thier-Reichs, Bd. i, t. 23, f. 5, A-E, 1862. Elaeacrinus verneuilli Dujardin and Hupe, Hist. Nat. Zooph. Echinod., p. 100. 1865. Elaeacrinus verneuili Shumard, Trans. St. Louis Acad. Sci., II, p. 369. 1870. Nucleocrinus verneuilit Billings, Am. Jour. Sci., vol. 50, p. 229, figs. 3-6. 1883. Elaeacrinus verneuili E. & C., Ann. & Mag. Nat. Hist., IX, p. 231. 1886. Elaeacrinus verneutlti E. & C., Cat. Blastoidea Brit. Mus., pp. 216-218, pl. 2, fig. 45; pl. 17, fig. 19; pl. 18, figs. 16-18; pl. 19, fig. 7. - 1889. Nucleocrinus verneuili Miller, North American Geology and Paleontology, p, 263. 1889. Nucleocrinus verneuili Bather, List Blastoidea British Museum (Nat. Hist.). p. 22. 1902-03. Nucleocrinus verneuili Rowley, Contributions to Indiana Paleontology, I, pp. 79-81 and 128-129, pl. 26, figs. 9-15, 18-22; pl. 27, figs. 17-23; pl. 36, figs. 52-56. 1900. Nucleocrinus verneuili Bather, A Treatise on Zoology, III, The Echinoderma, p. 88, text fig. 10. . 1909: Nucleocrinus verneuili Wood, U. S. Nat. Mus. Bull. 64, pp. 18-19, pl. 3, figs. 7-13. 1910. Elaeacrinus verneutlt Grabau and Shimer, North American Index Fossils, II p. 484, fig. 1796. 1918. Nucleocrinus verneuili Branson, Geology of Missouri, pp. 100-101, fig. 11. Troost's description—‘Pelvis—or the base of the body—is very complicated in the Olivanites. It is composed of five plates of an irregular form—each has a very elevated ridge running longitudinally over them, this elevated ridge is hollow at the superior margin, in the aperture of which it receives the lower extremity of the double rows of pores or what is generally called ambulacrum, these five plates, joined together have a subpentagonal form, each of the five angles being elevated and somewhat rounded to receive the five double rows‘of pores. Five such plates joined together have a penta- gonal vacuum in its center, and this open place, which I at first considered as a cavity in which acolumn. was inserted, is closed up with numerous small plates forming a kind of mosaic placed at the bottom of the cavity. Here the general arrangement of costals, and scapulars as in the generality of crinoids, | terminates. The whole is now composed of a shell on which no suture of junction is perceptible. Consequently it does not belong to the Prentremites in which these divi- sions are found, and in which the pelvis is divisible into three parts. Five double rows of pores, originating at the summit near two small elongated apertures, descending longitudinally terminate in the above-mentioned cavity under the elevations of the pelvic plates. These two rows of pores are separated by a narrow strip, or septum having a longitudinal depression in the middle, and must have answered for the same purpose as the ambulacra in the Pentremites which are also composed of double rows of pores. The apertures near the origin of the ambulacra—or double rows of pores—form in the interior a short conical tube, descending a short distance and it is not closed— the place where the ambulacra terminate is also open in the interior. The intermediate spaces between the ambulacra are superficially divided by longitudinal lines into five parts—the middle part is slightly elevated above the two others, and is more or less longitudinally grooved, while the two following are trans- versely striated. Four of these parts are of equal size—but the fifth is broader and its central part is much more elevated and wider than in the four other: divisions, it reaches not the same height and has on its summit a large lanceolate aperture with an elevated border. Its summit is covered with numerous microscopic plates.” CRINOIDEA. 59 Remarks—Specimens from the Mineola are abundant but are never well preserved. None of them retains the stirface markings, and identifications must be made largely on the basis of shape. Even in this there is considerable variation but the smaller speci- mens are all elongate, nearly symmetrical, and flat to convex between the ambulacra. The only large specimen collected is much less elongate compared with the width and is somewhat larger near the ventral end as is common with N. verneuili (Troost). Occurrence—Mineola limestone of Montgomery County. Class CRINOIDEA Order Camerata Family Melocrinidae Genus Melocrinus Goldfuss Melocrinus . gregeri Rowley Plate 7, figures 11 and 12. 1893. Melocrinus gregeri Rowley, Am. Geologist, XII, pp. 303-304, pl. 14, fig. 1. 1897. Melocrinus calvini W. and Sp., Harv. Mus. Comp. Zool. Mem., XX, p. 300, pl. 22, fig. 6. 1909. Melocrinus gregerit Greger, Am. Jour. Sci., XXVII, p. 376. Description—Calyx subpyriform; sides nearly straight from the top of the basals to near the bases of the arms; top of the tegmen nearly flat, with a small, short eccentric anal tube. Each of the radials, fixed brachials, and interbrachials to the third row, usually crowned by a pointed node. The lowest distichals in some cases bear nodes. Basals projecting downward around the column and often forming nodes at the lowest part of the plates; in large specimens the radials and costals are wider than long but in small specimens they may be nearly equidimensional or longer than wide. Inter- brachial spaces large, somewhat irregular, the plates arranged 1, 2, 3, 3, or 1, 2, 2, 2, or 1, 2, 3, 4. Four distichals are present but no interdistichals. The lower distichals are much smaller than the axillary. Anal area widest, with plates arranged 1, 3, 4, 5, or 4. Plates on the ventral disk small and subequal in size. Occurrence—Snyder Creek shale of Callaway County, location 1. The writer knows of only six specimens of the species from the Snyder Creek shale. Melocrinus lylit Rowley = Plate 6, figures 7 and 8 1894. Melocrinus lylit Rowley, Am. Geologist, XIII, p. 152, fig. 2. 1909. Melocrinus lylit Greger, Am. Jour. Sci., XXVII, p. 376. Rowley’s description—‘‘This is the smallest crinoid yet discovered at the Callaway locality. Three of the basal plates are quadrangular and the fourth pentagonal, slightly projecting outward. Three of the first radials are heptagonal and two hexagonal; width and length about equal. Second radials hexagonal. Third radials heptagonal, supporting above two series of two small plates each. Interradial series twelve to thirteen, arranged as usual in this genus. First interradial about as large as the second radial piece and hexagonal. Anal interradius composed of twelve pieces, all being small with the exception of the lowest piece. All the plates of the calyx of this little crinoid bear a central short spine and strong radiating ridges connecting the centers of all the plates, giving the specimen a very handsome appearance. Vault plates numerous, almost spinose and having the radiating ridges. Proboscis slender, excentric. Free rays, arms and column unknown.” 60 THE DEVONIAN OF MISSOURI. Remarks—The most remarkable thing about this crinoid are deep pits at the angles of the plates. From these pits the surface rises to the middle of the plates, form- ing low broad cones. Each plate is surrounded by 5 or usually 6 of the pits. Ridges cross from plate to plate between the pits, and sutures are rarely apparent. The ridges, pits, and cones distinguish the species from Melocrinus gregert which has the same arrangement of plates though it is a much larger form. Occurrence—Snyder Creek shale of Callaway County. The specimen figured is the holotype from the collection of Professor R. R. Rowley. Melocrinus tersus Rowley Plate 7, figures 9 and 10 1894. Melocrinus tersus Rowley, Am. Geologist, SIE pp. 151-152; hg. 1, 1909. Melocrinus tersus Greger, Am. Jour. Sci., X XVII, p. 376. Rowley's description—‘‘Calyx obconical; dome almost flat, basal plates four, three of which are quadrangular, the fourth and largest pentagonal. Breadth nearly twice the length, but slightly expanded; excavated for the reception of the column. Of the first radials, three are heptagonal and two are hexagonal; width a little greater than length. Of the second radials two are heptagonal, two hexagonal, another? octagonal. In the ray to the left of the anal area, the second radial? is entirely separated from the first radial (a malformation) by the abutment of the lower lateral edges of the large piece of the anal area and the large interradial to the left of the anal area. Third radials heptagonal, supporting, on the upper sloping sides, two small secondary radials. Interradial areas filled by from 12 to 14 pieces, the lowest one of which is almost as large as the first radial and hexagonal. In two of the areas two plates rest on the upper sides of the first interradial and first radial, while in one area three such plates are above the first. There seem to be about ten plates in the anal interradius, but this can not be well made out from the disordered condition of the radial series to the left. All of the calyx as well as the vault plates are slightly convex but without spines and radiating ridges, except at the edges where short connecting ridges give a pitted character to the lines of union. Vault pieces numerous. Base of proboscis medium, excentric. Base of the free, rays prominent, giving an actinocrinoid look to this beautiful species. Top stem joint rather large.” Remarks—Rowley’s type is abnormal in the anal and adjoining rays. Another specimen, collected from the type locality, has the following arrangement of the plates: In the anal area 1, 3, 4, 5, 5; in other interrays 1, 2, 3, 4, 4; 1, 2, 3, 3, 4; 1, 2, 2, 2, 3; 1, 2,3, 3, 3. Arrangement of plates in the type: Anal area 1, 2, 2, 3, 4; other interrays 1, 2, 2, 3,4; 1, 2, 2, 3,4; 1, 3, 3, 3,4; 1, 2, 3,4, 5. The second specimen is slightly longer compared to the width than the type and the plates are strongly convex, while in the type they are slightly convex. At nearly every angle between the plates a pore is present in the type, but only a few pores are present in the other specimen. The ridges be- tween the basals and radials are less prominent and fewer than in the type. A large series might show Melocrinus tersus and M. gregeri to be conspecific, though spines are absent on the known specimens of the former and are prominent on the latter, and the former is much smaller and less expanded at the top. Measurements of two specimens of M. gregeri show height 30 and 31 mm., greatest width 31 and 34 mm., o} two specimens of M. tersus, height 20 and 22 mm., width 18 mm. Occurrence—Known only from location 1, Snyder Creek shale, Callaway County. CRINOIDEA. 61 Megistocrinus and Stereocrinus E. B. Branson H. E. Wilson Branson wrote the descriptions of the new species of Megistocrinus and Stereo- crinus in 1918. In February 1922 he sent all of the materials and manuscript to Wilson. Wilson revised all specific descriptions and wrote the generic descriptions. All morphological discussion in the footnotes should be credited entirely to Wilson. All of the drawings of plates 6, 7, and 8, were made by Mr. G. T. Kline under the directions of Branson. Genus Stereocrinus Barris Calyx an oblate spheroid; convex or flattened orally; convex, flattened or de- pressed aborally: Height to width as1:1 to1:2.5. Tegmen1/3 to 1/5 height of calyx. Basal cycle discoidal; surface convex, flattened, or depressed to funnel-shape, nearly concealed by columnals; exposed margin narrow; axial canal large, quinquelobate, from 1/4 to 1/2 the diameter of the basal cycle. Basals (B) 3, subequal; 2 compound, reduced laterally, 1 simple, laterally enlarged, basal formula usually ab-c-de-, with com- plete ankylosis the formula becomes abcde. Radials (R), in contact laterally, subequal; 2 supported by compound basals only, hexagonal, 3 supported by two basals each heptagonal; all hexagonal when all basals are ankylosed! forming a basal disk. Primi- brachs (I Br) separated laterally, about equal-in area to radials but higher and nar- rower; pentagonal, axillary, and homologous to I Ax only.? Secundibrachs (II Br) all pinnulate; II Br; pentagonal with subtriangular outline supporting II Br, on the outer side of the dichotome and one pinnule on the inner. II Bra subtriangular; II Brs et seq., biserially arranged and incorporated to at least II Bre in larger specimens; the number of incorporated brachials varying with the size and age of the individual. Pinnules*-(P) of lower II Br partially incorporated, those above, free; incorporated pinnules (II nP) free above second pinnular (II nPrz); upper half of incorporated pin- nulars II nPir2 to II nPyr2 inflexed forming a portion of the tegmenal margin; neuro- | ambulacral canals of II nP present in immature specimens but absent in many larger, mature forms showing that the free portion of the pinnule was lost and the canal per- manently closed, during ontogenetic development. Interbrachials (iBr) 2, 3, or 4, uniserially arranged; iBr; the largest plate in the calyx; iBr2 et seq., consecutively re- duced in area. Incorporated interpinnulars inP rare; present only in large specimens. Arms bifurcating but once, biserial and pinnulate; size and length unknown; arm bases horizontally directed; enlarging by spreading rather than by growth, thus bringing more brachials and their pinnules into the cup wall. iThe term basal disk has been loosely applied to any group of ankylosed, or unankylosed basals having discoidal proportions and as this usage tends to confusion I believe the term should be applied only where complete ankylosis has taken place. 21 Ax in all forms having but one primibrach has usually been considered a compound plate but the tendencies in Dolatocrinus, from which Stereocrinus originated, show clearly that elimination by suppression and not ankylosis caused the loss of the I Br. *Pinnules, especially incorporated pinnules, form an important as well as a conspicuous portion of the skeleton in many genera of crinoids and the following terms and symbols are suggested for their technical description: Pinnules P; on secundibrachs II P, on tertibrachs IIL P, etc. Pinnules incorporated, nP; on secundibrachs II nP, etc. Pinnulars Pr; on pinnules of secundibrachs II Pr, etc. Pinnulars incorporated nPr. Interpinnulars iPr. Interpinnulars incorporated inPr. - Following Dr. Bather’s system of symbolism a step further we may designate any in- corporated pinnular in the following manner: ex. II nPirs meaning the second, incorporated pinnular of the pinnule arising from the first secundibrach. 62 THE DEVONIAN OF MISSOURI. Tegmen low, convex or flattened; 1/3 to 1/5 the height of the calyx. Ambulacral areas distinct; ambulacrals with regular uniserial arrangement. Primary interambu- lacrals (il amb) 2 x5, subequal, elongate, narrow, mirror twins, meeting incorporated pinnulars and occasionally iBrs or iBrs. illAmb, 1x5, narrow, elongate, meeting incorporated pinnulars. Orals (O), if present,! slightly modified in form, grouped in front of the anal opening, with the anterior and lateral orals resting against ilAmb and surrounding pO. Anal interambulacrals (An iAmb), 5 or more grouped between the orals, I Amb and il Amb. Anal tube if formed, small. Stem unknown; proximal columnals circular, conforming to unexposed outer sur- face of basals; discoidal if the base is flattened, or convex; funnel-shaped if the base is a re-entrant funnel. Plate surfaces smooth or ornamented, conforming to the general curvature of the cup or pronouncedly convex. Ornamentation consisting of ridges on the cup plates and papilli on tegmenal plates. Basically the ridges fall into three systems, the neural, transverse, and oblique ridges, which may be laterally duplicated by parallel secondary ridges forming groups of concentric triangles centering at the plate angles. Both pri- mary and secondary ridges may be smooth or rugose, broken up into bars and nodes, suppressed even to extinction or greatly exaggerated. Spines too, altho not discovered, may be found on both cup and tegmenal plates as this type of ornamentation often be- comes spinose. This great diversification of ornamentation and the differences in calyx form furnish the diagnostic characters for specific differentiation. All sutures closed; contact surfaces of plates with low relief consisting of minute vermiform ridges. Nervous system indicated by 5, unequal,* lobed depressions on the visceral side of the basals, and narrow, shallow grooves following the mid-line of the radials and brachials. Stereocrinus, derived directly as it was from Dolatocrinus, differs from it in the following characters: In the absence of I Br,, in having but one bifurcation of the arms, at least but one incorporated in the calyx and in the general absence of the free portion of the incorporated pinnules as well as closure of the pinnular neuro-ambulacral canals during ontogenetic development, after the loss of the pinnules. Stereocrinus moori n. sp. Plate 6, figures 5 and 6; plate 8, figure 8. Calyx of medium size, 1.5 times as wide as high; orally flattened, aborally depressed; aboral depression including BB and RR. IAx convex, curving smoothly from RR to IIBr; 11Br nearly vertical. Arm bases conical, laterally protuberant. Tegmen flattened, convexity low; depressed interambulacral areas curving smoothly to less depressed ilBrs. Cup ornamented by ridges; three primary and one secondary; neural ridge not accentuated; all ridges rugose: Tegmen papilose. Sutures not incised between ridges. Basal 3, forming a deep re-entrant funnel, mostly concealed; exposed rim narrow, rounded. Axial canal quinquelobate, 44 silo of base. Proximal columnals funnel- shaped. Radials and primibrachs subequal in size; [Ax higher and narrower than RR. IIBr, and IIBrz uniserially arranged, those following, smaller, biserial. Arms biserial, pinnulate from IIBr up, bifurcating but once; brachials incorporated to IIBry: Free portion of incorporated pinnules lost; incorporated pinnular canals closed. 1Whether these plates are true orals is not known as a sufficient number of young speci- mens has. not yet been found to satisfactorily trace the ontogenetic development of these plates, but until satisfactory evidence to the contrary is obtained I shall not abandon Wachs- muth and Springers’ terminology. 2The inequality in size of the lobes approaches the trilobed condition but as no calcareous neural capsule was formed the triangularity of the central area is not as well marked as in the Flexibilia and some of the other Camerata. CRINOIDEA. 63 Interbrachials in lateral areas three, uniserially arranged; in anal area six, irregu- larly arranged. Tegmen low, slightly convex, all plates conforming in outline to generic plan; sur- face papilose, conforming to general curvature. In form and ornamentation this species resembles Stereocrinus triangulatus Barris, but differs from it in having but one secondary system of ridges, rugose ornamenta- tion, less pronounced neural ridge, low curvature of tegmen and tegmenals, deeper interambulacral, interbrachial, and aboral depressions, and in the much smaller size of the basals, and proximal columnals. Occurrence—Mineola limestone of Ralls County. Collection—Geological Department of the University of Missouri. Specimen No. 3207. , Stereocrinus springert n. sp. Plate 7, figures 1-3. Calyx of medium size, from less than 1.5 to nearly 2 times as wide as high; orally elevated, aborally flattened; aboral flattening including RR. IAx at angle of 40 with sides above it nearly vertical. Arm bases directed laterally, not markedly protuberant. Tegmen elevated, convex, ambulacral areas elevated gradually on approaching arms; interambulacrals relatively depressed only; separated from interbrachials by a sharp horizontal ridge formed at the bend of the inflexed II nPro; interbrachials not depressed. Cup ornamented by ridges; three primary and one secondary; neural ridge not accen- tuated; all ridges rugose and broken up into bold, angular bars and nodes, uniting in various ways to form “‘graphic’’ figures. Sutures indistinct and not incised between ridges. Tegmenals nodose, barred or tumid depending upon general outline of the plates. Basals 3, forming a very shallow funnel, partially concealed by columnals. Axial, canal small, quinquelobate, about 1/4 the diameter of the base. Proximal columnals un- known. Primaxials as large or larger than radials. IIBr2 cuneiform, IIBrs et seq., biserially arranged. Arms bifurcating once, all I1Br pinnulate and incorporated to IIBr;. Free portion of nP lost, incorporated pinnular canals closed. Interbrachials in lateral areas 4, in anal interray 3 or 4, all uniserially arranged; ilBr, inflexed forming rim of tegmen. Tegmen high, convex, all plates conforming in outline to generic plan, surface of plates nodose, ridged, or tumid depending upon the plate form. Surface of paired ilAmb granulose. This species resembles S. triangulatus Barris in general form but differs markedly from it in ornamentation and number of ilBr. From S. moori Branson and Wilson it differs in the bold angularity of its broken ridges, in a general lack of depressions and in surface sculpture of the tegmenal plates. Occurrence—Abundant at one horizon of the Mineola near Spalding in Ralls County. Exfoliated specimens, seeming to belong to this species, are abundant in the Mineola of Montgomery County. Stereocrinus vandivert n. sp. Plate 7, figures 6-8. Calyx of medium size, 1.5 times as wide as high, greatest width at apices of I Axs, curving inward toward arm bases; orally flattened, aborally depressed. Arm bases directed obliquely upward, not markedly protuberant. Tegmen very low, 1/3 height of calyx, ambulacral areas not elevated, interambulacrals but slightly depressed, meet- ing slightly depressed interbrachials. Cup ornamented by ridges, three primary and one incomplete secondary; neural ridge accentuated; all ridges low, rounded, and 64 THE DEVONIAN OF MISSOURI. slightly wavy. Plates below IIBrz concave, with elevated rims and centers; sutures deeply incised between ridges. Tegmen papilose. Basals 3; funnel deep, rim broad and rounded; axial canal 1/4 diameter of base, quinquelobate; proximal columnals circular, funnel-shaped. Primaxials larger than radials. IIBre variable, pentagonal to cuneiform, IIBr; et seq., biserially arranged. Arms bifurcating once; all IIBr pinnulate and incorporated to IIBrs;. Free portion of nP lost, nP canals closed. Interbrachials 2, perhaps 3, in larger specimens, not meeting ilAmb. Tegmen very low, flattened; all plates conforming in outline to generic plan; sur- face of plates papilose. Anal opening slightly excentric, small. Column unknown. Stereocrinus vandivert differs-from the other species herein cited in the concavity of all plates below IIBro, flatness of the feces and bulging of the sides below the arm bases. : Occurrence—This is a common species in the Mineola limestone of Ralls County and is probably abundant in the Mineola of Montgomery and Warren Counties, al- though, as all specimens from there are exfoliated, it is impossible to identify them. The species is named for Mr. V. W. Vandiver, a student in the University of Mis- souri, who collected the best specimen. A small specimen is probably an immature S. vandiveri as it has the tendency to concavity in the plate surfaces, the same general style of ornamentation, and the deep marginal incisions between the ridges. In this specimen several interesting points in the development of incorporated pinnules are demonstrated. The pinnules of I[Bri and IIBr2, incorporated as described in the generic plan, are elevated slightly above the general surface of the tegmen, and several of the better preserved ones bear a small pinnule facet, showing that the free portion of the pinnule was very slender. The neuro-ambulacral canals, which are usually in contact with the facet, are here slightly above it. This fact coupled with the small size of tke facet ap- parently means that atrophy of the pinnule had already begun. A larger specimen shows complete absence of the canals and closer conformity of the incorporated with the body curvature. Family Batocrinidae Genus Megistocrinus Owen and Shumard The North American species of Megistocrinus form two reasonably distinct groups well separated stratigraphically but not differing to any great extent morphologically. The first group, the Devonian species, has in general 16 arm openings in the calyx, a strong anal tube, and few if any biserially arranged brachials incorporated. The second group, the Mississippian species, has 20 arm openings in the calyx, a weak anal tube, . and many biserial brachials incorporated. This difference is evidently due to increasing enlargement of the calyx which incorporates both tube and brachials in much the same manner as incorporation takes place in the ontogenetic development of many recent crinoids, and is not of sufficient importance to warrant separating the Devonian from the Mississippian forms. Megistocrinus (Devonian) Calyx large, generally wider than high; convex, flattened, depressed, or excavated aborally; convex to conical, or sometimes flattened orally. Plate surfaces generally smooth, either conforming to the cup curvature, convex to nodose, or ornamented with ridges radiating to the plate angles. Base hexagonal, with shallow depression for columnals; axial canal quinquelobate, 1/4 to 1/3 the diameter of the base. BB 3, hexagonal, sometimes completely ankylosed. 5 his CRINOIDEA. 65 Radials separated posteriorly by anal x; RR hexagonal in general outline. Primibrachs 2x5, laterally separated by ilBr. IAx often slightly out of vertical alignment. Ar- rangement! of brachials above IAx ant. and post. lats. 2I[Ax, 4IIIBri, 4111Bro, free biserials. Antero-laterals...2I1Br., 211Br2, 211Brs3, free biserials. “Arms biserial, branching and gradually diminishing in size upwards;’” biserials usually not incorporated, ‘“‘Pinnules small and rarely preserved.” ‘“Ambulacral cover- ing plates biserially arranged and bordered by a series of side plates.”’ Interbrachials numerous ilBr, regular in arrangement but not constant in number, the mean being approximately 1, 3, 3, 2, 2, 3, and the size growing progressively smaller from below upwards; ilIBr regularly arranged, but with slight variation in number, as for example 1, 2, 1 and 1, 2, 2, I II[Br few or none, large or small. All interbrachials -meeting the interambulacrals. Anal x narrower than the radials but of equal height; secondary anals one, rarely more; anal interbrachials of varying number but growing progressively smaller from below upwards and meeting the interambulacrals; anal interray usually broader than the others. Tegmen wider than high, convex to conical, or, rarely flattened; anal tube large, excentric; tegmenals numerous not regularly arranged, but growing progressively smaller from center to margin of calyx. ‘‘Orals’’ and radial dome plates ofiten accentuated in size Or Ornamentation, being larger than the other plates and occasionally spinose or with greater convexity. Ambulacral areas slightly elevated; interambulacrals de- pressed and meeting interbrachials: ambulacral cover plates often distinct marginally and with the “‘side plates’’ entering the tegmen. “Column circular, large, with strong cirri at distal end; axial canal quinquelobate.”’ Range: Devonian. To this group the following species may be assigned without question: M. rugosus Lyon and Casseday (Corniferous); M. farnsworthi (White), M. depressus (Hall), M. multidecoratus (Barris), M. nodosus (Barris), and the three species to be described later. The following species offer some variations: M. latus (Hall) has apparently no anal tube, M. spinosulus Lyon has 8 arm openings to each ray, M. concavus Wachsmuth has very few ilBr, and no ilIBr or ilIIBr, while M. abnormis (Lyon) is evidently a col- lection of abnormal individuals of doubtful generic and specific standing. Megistrocrinus broadheadii n. sp. Plate 8, figures 5-7. Species large. Calyx nearly as high as wide; deeply invaginated aborally, highly convex orally; basals, radials and lower 1/3 of IBr: curving upwards, sides of cup sloping but slightly outward from IBr; to arm bases. Radial areas elevated, interradial areas depressed; anal tubé slightly excentric, large. Basals and radials included in aboral invagination not distinct owing to the peculiar preservation which foils successful cleaning. Primibrachs 2 x 5; [Bri slightly larger than ilBr;, IAx offset in the anterior and post-lateral rays, symmetrically placed in the antero-lateral rays. Brachials above IAx arranged as described in the generic diagnosis. 1The bifid and trifid arrangement of the arms, so well expressed in the Devonian forms of this genus, is not of rare occurrence, being found in varying degrees of expression in many widely separated genera. In Botryocrinus it is shown by the angle of the radial facets in refer- ence to the vertical axis of the calyx; in Mysticocrinus in the lack of IBri and distal radial spines in the ant.-laterals; and in Pisocrinus in the peculiar subequal size of the anterior, and left posterior radials and the right-post. inferradial. I have mentioned but three examples of this phenomenon, yet its occurrence is so wide- spread and so clearly delineated that there can be no doubt that there is some fundamental principle governing it, but just what it is I am not ready to state. *Statements in quotation marks after Wachsmuth and Springer, in N. Am. Cam. a ai p. 532. 66 THE DEVONIAN OF MISSOURI). ilBr irregular, 1, 1, 2, 2, 1, 1; 1, 2, 3, 2, 2, 2, etc.; ilIBr absent in antero-lateral rays, and irregular in the others; ilII Br few or none. Tegmen high, convex; ‘“‘orals,’’ and plates covering ambulacral areas larger than interambulacrals. Anal tube excentric, large. Column and arms unknown. Measurements of the type specimen are: Height of cup Aged. , of tegmen 17 mm., width of base 33 mm., at arm bases 52 mm. The holotype of this species is not complete, as the left lateral rays have been broken away but these we have restored in the description. Megistocrinus broadheadii closely resembles M. concavus W. & S., (N. Am. Cam. Crin. p. 543, pl. 48, figs. 5a-c), in general configuration, and lack of secondary and. tertiary interbrachials, but differs from it the greater divergence and flattening of the cup walls, greater prominence of the arm bases, wider interradial depressions, larger size of the marginal tegemenals, lower convexity of the calyx plates, and lack of nodes on the ‘‘orals’’ and radial deme plates. Occurrence—Mineola limestone, 4 miles south of Montgomery City. The formation may be Callaway. Only a small patch of the rock is exposed, and it contains no diag- nostic fossils. Megistocrinus mineolaensis n. sp. Plate 6, figures 2-4. Species large. Calyx globose, wider than high; cup bowl shaped, with basals and radials nearly horizontal; tegmen as high as cup, convexity high; plates conforming to curvature of walls, unornamented (?), sutures scarcely visible. Measurements of type specimen, height 43 mm., width at arm bases 56 mm., width of aboral area of flattening 30 mm. Base hexagonal projecting beyond column; basals ankylosed; width of column facet unknown; axial canal quinquelobate, about 3/8 diameter of basal hexagon. All plates in radial cycle hexagonal; radials slightly larger than anal x, 2/3 as high as wide. Primibrachs 2 x5, IBr; larger then JAx. Arrangement of intrebrachials above IAx according to the group plan (see generic description). Primary interbrachials © irregular in arrangement; 1, 3, 3, 2, 2, 3; 1, 3, 4, 3, 3, 3; 1, 2, 3, 3, 3, and variable in size but growing progressively smaller from the base up. ilIBr, irregular, 1, 2, 2, or 1, 2, 1 ilIIBr also irregular, all interbrachials meeting interambulacrals in slight interradial depression. Tegmen: high, sloping upward from all sides to base of saat tube; ambulacrals - preserved near margin, biserial; ambulacral areas slightly elevated, interambulacrals slightly depressed. Anal tube excentric, 1/3 the diameter in from the back margin, Tegmenals numerous, about 200, irregular in size and form; orals undifferentiated. Megistocrinus mineolaensis resembles M. multidecoratus (Barris) in general con- figuration but differs markedly from it in an entire lack of ornamentation, and in having a lower tegmen. 3 Occurrence—Mineola of Ralls County. Megistocrinus missouriensis n. sp. Plate 6, figure 1; plate 8, figures 1-2. A large species. Calyx shallow, about three times as wide as high; tegmen flattened, basals and radials deeply and abruptly depressed; sides expanding rapidly upwards; arm bases elevated; plates strongly convex, margins depressed, sutures inconspicuous. Measurements of type specimen: Height 26 mm., width 66 mm., width of basal con- cavity 20 mm., depth 8 mm. CRINOIDEA. 67 Base hexagonal, convex, basals ankylosed; size of column’ facet unknown; axial canal quinquelobate, 1/3 diameter of base. All plates of the radial cycle hexagonal, almost perpendicular; radials slightly larger than anal x. Primibrachs 2 x 5, [Br: smaller than [Ax. Arrangement of brachials above IAx as given in the generic description. Primary interbrachials arranged 1, 2, 2, or 3, 2; ilIBr inthe bivium 1, in the trivium 2; anal interray X, 3, 2, 2. ilI1Br 1 or more. ‘All interbrachials meeting interambulacrals. Tegmen slightly elevated centrally, flattened marginally; plates convex, numerous, of irregular form and size, sutures indistinct. Anal tube about 1/7 diameter of tegmen, excentric, about 1/3 the diameter in from the back margin. Column and arms unknown. Remarks—The species as represented by a single specimen is characterized by great width, low dome, shallow cup, and deep aboral depression. The type is somewhat misshapen on account of crushing and the cup may have been slightly deeper than shown in the figure. Megistocrinus missouriensis differs from all species herein cited in the great width at the arm bases and flatness of its tegmen. Occurrence—Mineola limestone, 4 miles south of Montgomery City. Order Flexibilia Family Ichthyocrinidae Genus Dactylocrinus Quenst. Dactylocrinus concavus (Rowley) Plate 7, figures 4 and 5 1893. Taxocrinus concavus Rowley, Am. Geologist, XII, pp. 304-305, pl. 14, fig. 2. 1894. Taxocrinus concavus Rowley, Am. Geologist, XIII, pp. 153-154, figs. 3 and 9. 1895. Aristocrinus concavus Rowley, Am. Geologist, XVI, pp. 217-219, figs 1 and 2. 1902. Aristocrinus concavus Keyes, Bull. Geol. Soc. America XIII, p. 285. 1909. Aristocrinus concavus Greger, Am. Jour, Sci., XXVII, p. 376. 1920. Dactylocrinus concavus Springer, The Crinoidea Flexibilia, Smithsonian Institu- tion, pp. 309-310 plate 41, figs. 7a, b, c, 8a, b, c, 9. Springer’s description—‘‘A rather small species. Crown short, rotund, with broad base; contracting above the inter-axial, where height to width is 1 to 2.2; spread of calyx from outside of basal rim, 1 to 2; cross-section obtusely pentagonal, side outline curved. Base broadly and shallowly concave, resting on basals and lower incurved points of radials. Surface smooth. Crown of mature specimen, 25 mm. high by 22 mm. wide; base at line of curavture of rim, 11 mm., column facet, 5 mm. Infrabasals small, wholly covered by the column. Basals curving from basal cavity to outside of rim; their points visible in side view; post-basal truncate, not rising to top of radials, followed by small anal, and this by two series of 3 or 4 plates tapering to an apex between posterior rays. Interbrachials one very large plate, rising to top of distichals, with a wide, rounded, distal face, probably for attachment of perisome. Interdistichals present in large specimens. Radials unusually large for the genus— the largest plates in the calyx. Costals much shorter and narrower. Rays and their divisions deeply rounded, tapering but little; the inner branch the smaller; distichals usually 3, occasionally 2 or 4. Ramules small, 4 to 6 visible below point of infolding; intervals usually of 3 or 4 brachials, shorter in the distal portions. Column small, with thin ossicles next to calyx. A well-marked and constant species, nearer to D. excavatus than to any other, but without its deep basal cavity; otherwise distinguished by its longer, more rounded, and less tapering ray divisions. In that species the ramules become equal to the main 68 THE DEVONIAN OF MISSOURI. branches at about the third division, whereas here they are well differentiated to at least the sixth.” Occurrence—Springer figures 3 specimens. Probably all are from the Snyder Creek shale type locality on Craghead Creek. The figures on plate seven are all from Mr. Rowley’s original type, from the same locality. MOLLUSCOIDEA Class BRYOZOA Order Cyclostomata Family Fistuliporidae Genus Galata Ulrich Cyclotrypa communis Ulrich Plate 9, figures 7-9. 1890. Fistulipora communis Ulrich, Geol. Surv. Illinois, VIII, p. 476, pl. 47, figs 1 and 1a; pl. 48, figs. 1 and la. 1896. Cyclotrypa communis Ulrich, Zittel’s Textbooks of Paleontology (Engl. ed.), voi. I, p. 269, fig. 443. 1913. Cyclotrypa communis Bassler, Zittel’s Textbook of Paleontology (Engl. ed.), vol. I, 2nd ed., p. 329, fig. 470. Ulrich's description—‘‘Zoarium explanate, commonly attached to foreign bodies, at other times free and provided with an epitheca, often composed of layers, each a mm. or two in thickness. The surface is raised into low, broad, rounded monticules two or three mm. wide, and their summits three or four mm. apart. Apertures circular with a very thin but distinctly elevated peristome, generally about 0.16 mm. in dia- meter, but attaining a diameter of 0.25 mm. near the summits of the monticules; dis- tances apart rather variable, those in the monticules more separated than the other: In the intermediate spaces five or six occur in two mm. When the surface is worn the apertures appear quite small and the interspaces very wide. Zooecia thin walled, circu- lar or oval, provided with two or three distant diaphragms. Lunarium obsolete. Vesicles thin-walled, generally wide and shallow, about two-thirds as wide as the zooecia, sur- rounding them in two or more series and forming large clusters under the monticules. ~ In good tangential sections the vesicle spaces exhibit one or more subcentral minute spots, which probably represent perforations in their covers.”’ Remarks—This is a common form in the Mineola. It is often attached to foreign bodies, the coral Ceratopora grubaui Branson being one of its favorites. The speci- mens show very few zooecial openings at the top of the monticules, and no subcentral spots have been observed in the vesicle spaces. Occurrence—Mineola of Montgomery and Warren Counties. Cycloirypa magna-monticulata n. sp. Plate 9, figures 4, 5, 16; plate 10, figures 1, 3, 6. Though several specimens of this species have been collected, the description is based mainly on a well-preserved impression and on part of a well-preserved zoarium. The zoarium impression is nearly semicircular with a radius of about 3cm. The original was strongly concave, the center being depressed about 2 cm. below the edges. The most striking characteristics of the specimen are the large size of the monti- cules and their large distance apart. They range from 1 to 2 millimeters in height, from | 4 | : — BRYOZOA. 69 3 to 5 millimeters across, and from 6 to 8 millimeters from crest to crest. The zooecia are arranged in fairly definite rows, about .23 mm. apart, and about the same dis- tance apart in the rows, giving a reticulate pattern to the surface. They average .25 mm. in diameter. The margins of the peristomes are strong, and the posterior part of the margin is the more distinctly elevated. Occurrence—Mineola of Montgomery County. Order Trepostomata Family Batostomellidae Genus Lioclema Ulrich Lioclema occidens (Hall and Whitfield) Plate 4, figures 7 and 8; plate 9, figure 15; plate 10, figures 4 and 7. 1873. Fistulipora occidens Hall and Whitfield, Twenty-third Ann. Rept. New York State Cab. Nat. Hist., pp. 228-229, pl. 10, figs 9 and 10. 1878. Callopora cincinnatiensis Ulrich, Jour. Cincinnati Soc. Nat. Hist. I, p. 93, pl. 4, figs. 8, 8a. 1882. Callopora cincinnatiensis Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, p. 142, _ pl. 6, figs. 18, 18a. 1890. Letoclema occidens Ulrich, Geol. Sur. Illinois, VIII, pp. 426-427. - 1900. Lioclema occidens Nickles and Bassler, American Fossil Bryozoa, Bull. U. S. Geol. Surv., 173, p. 305. 1909. Leioclema occidens Greger, Am. Jour. Sci., XXVII, p. 376. Ulrich’s description—‘‘Zoarium exceedingly variable in form, commonly irregu- larly ramose or lobate. Surface smooth, occasionally (in exceptionally well preserved specimens) minutely spinulose, but this is never a conspicuous feature. Walls of zooecia thin, somewhat flexuous in the axial region, slightly thickened in the peri- pheral region. Apertures of zooecia circular from 0.15 to 0.20 mm. in diameter, seven or eight in the space of two mm.; encircled by a single series of large angular or sub- circular mesopores, On an average about two-thirds the size of the true zooecia. Dia- phragms rather few and remote in the zooecial tubes, in the mesopores more numerous, and about their diameter or more apart. “Acanthopores small, present in moderate numbers, and at times encroaching a little upon the zooecia.”’ Remarks—Of the Missouri specimens none shows acanthopores; the diaphragms are about as numerous in the mesopores as in the zooecia; in some places more than one row of mesopores separates the zooecia. In the original description mention is made of “low, rounded tubercles”’ irregularly spaced on the surface of the zoarium, and such tubercles are present on most of the Missouri specimens, though they are widely spaced and often absent over large surfaces. Lioclema occidens (Hall and Whitfield) is abundant near the bottom of the Snyder Creek shale, at many places in Callaway and Mont- gomery Counties. In the same bed Stropheodonta boonensis Swallow is abundant. Order Cryptostomata Family Fenestellidae Genus Fenestella Lonsdale | Fenestella missouriensts n. sp. Plate 9, figures 13 and 14. Description—Species known from one fair specimen and several fragments. Zoar- lum growing into large flabellate expansions. Branches averaging about 5 in 10 milli- 70 THE DEVONIAN OF MISSOURI. meters. Fenestrules varying slightly in size, but averaging 4 to 5 in 10 millimeters, measured longitudinally. Branches subcarinate and following zigzag courses on the non-celluliferous face. Zooecial openings about 7 to 2 millimeters, 2 to 4 rows between the fenestrules. This species resembles Fenestella perundata Hall, but the fenestrules are much smaller than in that form and are more regularly arranged. Occurrence—Mineola of Montgomery County. Genus Hemitrypa Phillips Hemitrypa mineolaensis n. sp. Plate 9, figures 10, 11, 12; plate 10, figure 5. Zoarium known from numerous fragments and from one fairly complete specimen. On the reverse side many of the branches are nearly straight while others are slightly zigzag, 9 to 11 in 5 millimeters, rounded, and with considerable variation in width. Dissepiments short, slenderer than the branches, ranging from opposite to alternate in adjoining rows, generally rising above the branches and forming intérrupted zigzag ridges. Fenestrules oval to nearly circular, about .4 mm. by .2 mm., with about 14 in 1 centimeter. On the obverse side the branches appear narrower than on the reverse and are not so broadly rounded at the top. Zooecial pores in two parallel ranges, opening obliquely toward the fenestrules, 3 or 4 to each fenestrule, 23 in 5 millimeters. The network on the obverse side is very delicate. The principal bars are easily distinguishable from the secondary on account of their greater width and height; the lateral bars are like the secondary, and there are about 23 in 5 millimeters. This species differs from Hemitrypa tenera Ulrich, in the circular shape of the openings in the network on the obverse side, the larger size of the principal bars on this side, in the larger size of the branches of the zoarium, comparatively slenderer dissepi- . ments, and higher dissepiments uniting to form ridges. Remarks—This is the most abundant fossil in the Mineola limestone. Occurrence—Mineola limestone of Montgomery and Warren Counties. - Family Rhabdomesontidae Genus Rhombopora Meek Rhombopora missouriensis n. sp. Plate 9, figure 6; plate 10, figure 2. Description—Zoarium branching dichotomously at intervals of 5 to 10 mm. usu- ally spreading in one plane but sometimes in various directions. Branches from 0.5 to 3 mm. in diameter. Zooecia proceeding out from the axis of the branch at an angle of about 80°. Zooecial apertures small, oval, 0.2 mm. long, arranged in longitudinal and diagonal intersecting series, 7 in 2 mm. in the first, and 9 to 10 in 2 mm. in the second. In some specimens the rows are very irregular. Interspace generally ridge- shaped, the summits rather sharp, enclosing oval depressions which are steep sided at the lower side and gently sloping from the upper. Rhombopora subannulata Ulrich, from the Devonian of Iowa, has a similar ex- ternal appearance but has tubercles at each angle of intersection of the surface ridges and the zooecia branch out at a much smaller angle. Occurrence—Abundant near the top of the Snyder Creek, in the Stromatoporoid zone in Callaway County. BRACHIOPODA. vat Family Cystodictyonidae Genus Cystodictya Ulrich Cystodictya mineolaensis n. sp. Plate 9, figures 1 and 3 Zoarium a parallel-edged, bifurcating stipe with narrow non-poriferous margins, elliptical in cross-section, 2 to 3 mm. in average width, greatest thickness about .4 mm. Zooecial apertures in 7 or 8 longitudinal, parallel rows, separated by well-developed parallel ridges; averaging 3 zooecia per millimeter lengthwise of the rows; apertures about .2 mm. in their longer diameter and .14 mm. in their shorter, separated longi- tudinally by a space about equal to their own width, not alternating so as to give a zigzag appearance to the interspace but most often opposite. The zoarium varies widely in shape, the branches coming off at infrequent intervals in some specimens and being much closer together in others. Remarks—The species is represented by only a few specimens, Occurrence—Mineola formation of Montgomery and Warren Counties. Genus Coscinium Keyserling Coscinium missourtensis 1. sp. Plate 9, figure 2 Zoarium consisting of an explanate frond with oval or circular perforations or fenestrules at somewhat regular distances; length of fenestrules 114 to 2 mm., width 1 to 14% mm.; generally distant transversely about 2144 mm., longitudinally about 3144 mm. Cell apertures subcircular, diameter about .12 mm., irregularly spaced, generally separated by one or two apertural diameters.. A non-cellular band ranging from 4 mm. to 144 mm. wide borders each fenestrule. The cell apertures are in grooves and low sinuous ridges occupy the intercellular space. The zoarium is 4 mm. thick or less. Remarks—This species resembles Coscinium striatum Hall but the pores are smaller and more numerous and the sinuous ridges are much larger and only one occurs between the rows of pores. The surface of our only specimen is somewhat macerated and it is impossible to determine whether the pores originally had denticles. Occurrence—Mineola of Montgomery County. Class BRACHIOPODA Order Neotremata Superfamily Discinacea Family Discinidae Genus Orbiculoidea d’Orbigny Orbiculoidga sp. undet. One fragmentary brachial valve of an Orbiculoidea from the Snyder Creek shale is in the collections of the University of Missouri. The fragment represents an individual about 25 mm. wide and of only moderate height. Greger', identifies this form as O. telleri Cleland, but the identification is, at best, doubtful. 1Am. Jour. Sci., Vol. 49, 4th Series, p. 266. 72 THE DEVONIAN OF MISSOURI. Superfamily Craniacea Family Craniidae Genus Crania Retzius Crania famelica Hall and Whitfield Plate 11, figures 1 and 2 . 1872. Crania famelica Hall and Whitfield, Descriptions n. sp. Fossils, p. 17, pl. 11, figs. 6, 7. 1873. Crania famelica Hall and Whitfield, Twenty-third Rep. New York State Cab. Nat. Hist., p. 236, pl. 11, figs. 6, 7. 1897. Crania famelica Schuchert, U.S. Geol. Surv., Bull. 87, p. 190. 1909. Philhedra famelica Greger, Am. Jour. Sci., XXVII, p. 376. Hall and Whitfield’s description—“Shell small and thin, seldom exceeding one- third of an inch in diameter, the largest seen measuring about four-tenths of an inch; usually flattened, discoid, the apex subcentral and scarcely elevated. Surface marked by distinct lamellose lines of growth, which are often partly obliterated by conforming to the surface of the bodies to which they are attached, as Spirifera and Orthis. The only convex example seen, is about half as high as wide, but it is attached to a very convex surface, which must occupy about half the convexity; usually they are entirely compressed, with the exception of a small area surrounding the apex.” Remarks—Crania famelica Hall and Whitfield is common in the Snyder Creek shale and has been reported by Greger from the Callaway limestone. It is only rarely well preserved, being represented most commonly by subcircular rings on other fossils. Order Protremata Superfamily Orthacea Family Rhipidomellidae Genus Schizophoria King Schizophoria striatula (Schlotheim) Plate 15, figures 1-7. 1813. Anomia Terebratulites striatulus Schlotheim, Min. Taschenbuch, VIII, pl. 1, fig. 6. 1843. Orthis impressa Hall, Geol. N. Y.; Rep. Fourth Dist., p. 267-268, fig. 2. 1852. Orthis lentiformis Owen (non Hall), Geol. Survey Wisconsin, Iowa, Minnesota, pl. 3, figs. 10, 10a. 1858. Orthis iowensis Hall, Geol. Survey Iowa, I, pt. 2, p. 488-489, pl. 2, fig. 4 1858. Orthis iowensis var. furnarius Hall, Geol. Survey Iowa, I, pt. 2, pp. 489-490, pl. 2, fiz: 5. 1859. Orthis iowensis Billings, Hind’s Rep. ree Assiniboine and Saskatch., p. 187, ire be 1865. Orthis striatula Davidson, Brit. Bauman Brach., Pal, Soc:, p; 87; pl. 1%, fies. 4-7, 1867. Orthis impressa Hall, Pal. New York. IV, pt. 1, p. 60, pl. 8, figs. 11-19. 1867. Orthis 1owensis Meek, Trans. Chicago Acad. Sci., I, pt. I, p. 90, pl. 12, fig. 2. 1868. Orthis Iowensis var. furnarius Meek and Worthen, Geol. Survey Illinois, III, p. 424, pl. 13, fig. 9, % BRACHIOPODA. 73 1880. Orthts towensis White, Second Ann. Rep. Indiana Bureau of Statistics and Geol., ’ pp. 501-502, pl. 5, figs. 10-12. : 1882. Orihis impressa Whitfield, Geol. Wisconsin, IV, p. 326, pk 25, figs. 13-15. 1884. Orthis impressa Walcott, Mon. U. S. Geol. Survey, VIII, p. 115, pl. 13, fig. 13. 1889. Orthis propinqua Nettelroth (non Hall), Kentucky Fossil Shells, Monograph Kentucky Geol. Survey, p. 43, pl. 16, figs. 1-3, 7-11. 1891. Orthis striatula Whiteaves (non Schlotheim), Cont. Canadian Pal., I, pp. 218, 283. 1892. Schizophoria Iowensis Hall and Clarke, Pal. New York, VIII, pt. 1, pp 212-216, pl. 6a, fig. 29. 1892. Schizophoria impressa Hall and Clarke, Ibid, pp. 212-216, pl. 6, fig. 31; pl. 6a, figs. 26, 27. 1895. Orthis iowensis Keyes, Geol. Survey Missouri, V, pt. 2, p. 62, pl. 38, fig. 6. 1896. Orthis impressa Kindle, Bull. American Pal., 6, p. 36. 1897. Schizophoria striatula Schuchert, U.S. Geol. Surv., Bull. 87, p. 375. 1901. Schizophoria striatula Kindle, Indiana se Geol. Nat. Res., 25th Ann. Rept., p. 626, pl. 3, figs. 11, 11a. 1909. Schizophoria iowensis and Schizophoria macfarlant Greger, Am. Jour. Sci., ‘ XXVII, pp. 376-377. 1911. Schizophoria striatula Cleland, Bull. 21, Wisconsin Geol. Surv., pp. 93-94, pl. 19, figs. 1-6. 1913. Schizophoria striatula Clarke and Swartz, Maryland Geol. Surv., Middle and Upper Devonian, pp. 572-574, pl. 52, figs. 14-18; pl. 53, figs 1 and 10. 1913. Schizophoria striatula Prosser and Kindle, Maryland Geol. Surv., Middle and Upper Devonian, pp. 170-171, pl. 14, figs 13, 14. Hall’s description—‘‘Shell rotund. Dorsal valve very gibbose wider than long, sinuate in front; hinge-line about two-thirds the width of the shell. Ventral valve moder- ately convex at the sides, somewhat flattened on the umbo, with a broad undefined sinus which becomes deeper towards the front, the margin of the shell being somewhat abruptly incurved; area of moderate height, a little incurved at the beak. The surface is very finely and evenly striated, and the texture of the shell is minutely punctate. The cast of the dorsal valve shows a strong, somewhat quadrilobate muscular im- pression, limited by strong and widely diverging socket-plates, with the vascular im- pressions somewhat narrow and extending below it to the margin of the shell. The surface of the cast preserves fine even striae. The cast of the ventral valve is broadly sinuate in the middle below, with a triangular or subovate deeply bilobed muscular impression, which is subject to considerable variation in form and proportions.” Remarks—The Schizcphorias from Iowa have usually been identified as S. cowensis Hall and Clarke. According to Clark and Swartz,! the main differences between 5S. iowensis Hall and Clarke and S. striatula are that the former is smaller, has finer stria- tions, more gibbous dorsal valve, narrow median depression on ventral valve, and more sharply sinuous anterior margin. In the Snyder Creek shale of Missouri this is a very abundant form and specimens may be selected that agree with S. striatula while others agree with S. iowensis Hall and Clarke, or two of the distinguishing characteristics of one and two of the other may be present on the same shell. A large specimen of S. striatula from Maryland is 30 mm. in length by 40 mm. in width. The largest specimen from the Snyder Creek, in the collections of the Uni- versity of Missouri, is 39 mm. in length by 50 mm. in width. Average specimens are about 25 mm. in length by 30 mm. in width. The striations show considerable varia- tion, the larger specimens having the coarser, and they range from the S. iowensis Hall and Clarke size to that of S. striatula. The extremely gibbous brachial valve is 1Upper Devonian of Maryland, p. 573. - 74 THE DEVONIAN OF MISSOURI. exceptional in Missouri specimens as it is in lowa specimens; normal individuals are no more gibbous than normal individuals from New York or Maryland. The de- pression on the ventral valve is broader and shallower than in average specimens from Iowa though many Iowa specimens are similar to those from Missouri; the average Missouri specimens are normal for S. striatula. The emargination of average Missouri specimens is about the same as for average S. striatula and not as deep as in the Iowa specimens. The Snyder Creek specimens are typical S. striatula though one extreme is like the typical S. cowensis Hall and Clarke. Occurrence—Abundant in the Snyder Creek shale of Callaway and Montgomery Counties; rarely found in the Callaway limestone of the same counties. — Schizophoria cf. propinqua (Hall) Plate 11, figure 4 1857. Orthis propinqua Hall, Tenth Rep. N. Y. State Cab. Nat. Hist., p. 110. 1867. Orthis propinqua Hall, Pal. New York, IV, pt. 1, p. 43, pl. 5, fig. 3. 1883. Orthis propinqua Hall, Second Ann. Rep. N. Y. State Geol., pl. 36, figs 30 and 31. 1892. Schizophoria fropinqua Hall and Clarke, Pal. New York, VIII, pt. 1, pp. 212, 226, pl. 6,ig. 30, 1897. Schizophoria propinqua Schuchert, U.S. G. S. Bull. 87, p. 574. 1909. Schizophoria propinqua Grabau and Shimer, North American Index Fossils, I, p. 268. Hall's description—‘‘Shell somewhat transversely elliptical or subquadrate, the front truncate or emarginate, and the sides little curved, varying from moderately to extremely gibbous; hinge-line equaling or a little greater than half the width of the shell. Dorsal valve the larger and much the more gibbous; the greatest convexity a little above the middle of the length. curving abruptly to the sides and beak, and a little more gently to the front; sometimes a little concave just within the cardinal angles; area inclined to the area of the opposite valve, and about one-half or two-thirds as wide; dorsal beak full, broad and rounded or obtusely pointed, extending a little beyond and slightly incurved over the area. Ventral valve less gibbous than the dorsal, very promi- nent on the umbo, sloping very abruptly to the cardinal angles and more gently towards the lateral and basolateral margins, flattened in the centre; the lower half marked by a gradually increasing, broad and undefined sinus, which gives a strongly curved outline to the front margin; beak more acutely pointed and incurved; area elevated and in- curved, its length equalling or greater than half the width of the shell. The beaks of the two valves are approximate. Surface marked by fine unequal striae which increase by interstitial additions, and are crossed by fine concentric striae, and, at unequal intervals, by stronger imbricating lamellose lines of growth. In certain conditions of the surface, the striae show tubular openings at the concentric lamellose lines. There are from eight to ten of the larger striae in the space of two lines; and by counting the finer intermediate striae, there are sometimes from thirteen to eighteen in the same space. The cast of the dorsal valve shows a subquadrate or quadrate-ovate muscular scar, with a deeply marked border and longitudinal median groove; a groove passes from the centre of the median line obliquely to the lower lateral angles, dividing the adductor muscular scar. The vascular impressions radiate from the muscular impression in broad bands, dividing several times before reaching the margin of the shell.’ Remarks—Only two specimens are in our collections and as only the exteriors are exposed the identification is uncertain. One of the specimens has a more pronounced sinus than any specimens examined from Iowa and Michigan. Occurrence—Mineola of Montgomery and Warren Counties. i i i BRACHIOPODA. - 75 Superfamily Strophomenacea Family Strophomenidae Genus Stropheodonta Hall Stropheodonta boonensis Swallow Plate 11, figure 11; plate 15, figures 6-12; plate 14, figure 9. 1860. Strophodonta boonensis Swallow, Trans. St. Louis, Acad. Sci., I, p. 638. 1897. Stropheodonta navalis boonensis Schuchert, Bull. U. S. Geol. Surv. 87, p. 425. 1918. »Stropheodonta boonensis Branson, Geology of Missouri, p. 101, fig. 1. Swallow's descrittion—‘‘Shell hemispheroidal. Ventral valve regularly convex, slightly raised along the mesial line; umbo depressed, scarcely modifying the curvature of the valve; beak small, slightly incurved over the area; area straight, narrow, im- pressed, striated vertically, about as long as the width of the shell; ears small, indistinct. Dorsal valve less convex, semielliptical, depressed in front; lateral margins recurved to meet the cardinal border. Surface marked with large rounded, 1adiating plications, (which are sometimes angular, irregular and unequal), increased by subdivisions and implantations. Length, 1.12; breadth, 1.20; depth of ventral valve, .65.” Additional description—The hemispheroidal shape is prominent but is often modi- fied by the small ears when they are present, by increased or decreased length of hinge- line, by decrease of convexity of the pedicle valve, and by the greater convexity coming nearer the hingeline than the anterior margin. Average specimens are not slightly raised along the mesial line. In’some specimens that grade toward S. inflexa Swallow the umbo modifies the shape of the valve. Measurements of three specimens give the following dimensions: Length 30, 2414, 22 mm., breadth 37, 35144, 24 mm., height 22, 18, 15 mm. The plications present a considerable amount of variation though they are all coarse; the extremes are an average of 6 to the centimeter and 12 to the centimeter. In plications the specimen with 10 to the centimeter is about like S. inflexa Swallow but in other respects it is quite distinct. The entire shell is punctate. In one direction this species grades toward S. inflexa Swallow, from which it differs in having coarser plications, length compared to breadth being much less, averaging about 3:4 compared to 9:10 in inflexa and in the umbo not projecting back of the hingeline. In another direction it grades toward S. callawayensis Swallow from which it differs in its greater convexity, shorter hingeline, less prominent ears, and coarser plications. Remarks—Schuchert refers S. boonensis and. S. inflexa to S. navalis boonensis. Swallow’s descriptions clearly differentiate these forms and though some specimens intergrade it is an easy matter to refer almost all specimens to their species. S. navalis is defined by Swallow as having ‘‘ears distinctly defined and strongly arched towards the area’’ while both of these species have the ears poorly defined and not arched toward the area. Both of these species have coarse plications while S. navalis Swallow is defined as having “‘numerous plications.’ Occurrence—Snyder Creek shales Callaway and Montgomery Counties. Stropheodonta callawayensis Swallow Plate 13, figures 1-5 1860. Stropheodonta callawayensis Swallow, Trans. Acad. Sci. St. Louis I p. 638. 1897. Stropheodontia callawayensis Schuchert, Bull. U. S. Geol. Survey, 87, p. 420. Swallow's description—‘‘Shell semi-elliptical, margin regularly curved from the anterior margin to the cardinal extremities. Ventral valve very convex from middle towards the beak; somewhat flattened towards the anterior and lateral margins; the 76 THE DEVONIAN OF MISSOURI. convex or raised portion broadly ovate; ears large, well defined, and arched towards the cardinal borde:; extremities recurved towards the center of che valve; area common to both valves, wider in the middle, as long or shorter than the width of the shell; umbo large, prominent. Dorsal valve concave following the curvatures of the opposite valve; lateral portions, towards the cardinal line, curved down and arched to form the concave surface of the ears; cardinal border crenulated. Surface marked with numerous small, rounded, granulated radiating costae, and by fine concentric striae and lamellar imbricating bands, which are.most abundant near the margins. “Length 1.30; breadth 1.35; depty of ventral valve .52. “This fossil most resembles S. demissa of Conrad; but it is more convex, its ears are better defined and less prolonged on the cardinal line. It may be distiriguished from S. aequicostata Swallow by its larger and better defined ears, and by the ovate form of the convex portion of the ventral valve.” ; Revised description—Shell semicircular to semielliptical, margin regularly curved to near the cardinal extremities where, in most cases, it turns sharply outward. Pedicle valve moderately convex with the greatest convexity in or posterior to the middle; the convex portion sloping rather uniformly toward the sides but interrupted at the base of the ears; ears large, acute, arched toward the cardinal border; umbo of moderate to small size. Brachial valve concave, following closely the curvature of the opposite valve, curving downward near the cardinal line to form the concave surface of the ears. Surface of both valves marked with moderately large plications which increase by im- plantation and occasionally by bifurcation, generally 8 to 10 plications to the centi- meter, occasionally 12 or 6. Some specimens grade towards S. boonensis Swallow, differing in the smallness of the umbo, greater length of the hingeline, and much more numerous plications. “s Three average specimens measure, width 47mm., 58 mm., 46 mm.; length 35 mm., 32 mm., 31 mm.; height 16 mm., 15 mm., 15 mm. The width of the cardinal area in six average specimens is 214 to 314 mm., in an unusually thick shell the area is 6 mm. wide. The species grades toward S. demissa (Conrad) from which it differs in its greater convexity, greater length of hingeline, coarser plications, thicker shell, wider cardinal area, and greater width compared to length. It also grades to-vard S. boonensis Swallow from which it differs in lesser convexity, longer hingeline, greater width compared to length, and less prominent umbo. Remarks—Swallow’s description of S. callawayensis does not agree in several respects with the specimens which are here referred to that species. The greatest discrepancies are in the extremities of cardinal border usually not being recurved towards the middle of the valve, the umbo not being large, and the plications being of medium to large size. As this is an abundant form in the fauna, it seems unlikely that Swallow would not have described it with the rest and the description of S. callawayensis is the only one that agrees in even a general way. For these reasons our specimens are referred to this species and the description modified to agree. Specimens may be selected that would fit Swallow’s description but they are rare in the fauna and seem to be merely variations from the general type. Occurrence—Snyder Creek shale, Callaway and Montgomery Counties. Stropheodonta cymbiformis Swallow Plate 12, figures 1, 2, 3. 1860. Strophodonta cymbiformis Swallow, Trans. St. Louis, Aead. Sci., I, pp. 635-636. 1860. Strophodontia subcymbiformis Swallow, Ibid., p. 636. 1860. Strophodonta kemperi Swallow, Ibid., pp. 636-637. 1860. Strophodonta altidorsata Swallow, Ibid., pp. 637-638. 1897. Stropheodonta navalis, cymbiformis, subcymbiformis and altidorsata Schuchert, Bull. U. S. Geol. Surv., 87, pp. 424-425. -_ BRACHIOPODA. 77 Swallow's description—‘‘Shell semiellipsoidal, auriculate and costate. Ventral valve very convex, subcarinate, highest near the center; curvature increased regularly from the anterior margin to the beak; flattened towards the lateral margins and sharply rounded along the middle; umbo large, projecting beyond the cardinal line about one- fourth the length of the shell; beak small, strongly recurved; scarcely modifying the area; area straight, narrow, and much impressed; cardinal line as long as the width of the shell. Dorsal valve semielliptical, very concave, with a deep rounded sinus in front to fill the corresponding elevation in the opposite valve; the lateral edges recurved and arched to meet the impressed cardinal border, and form the sinuses leading from the central cavity into the small arched‘ears. Surface marked by small, rounded, granulated irregular, radiating plications, whose number is increased by subdivisions and implanta- tions. Length, 1.45; breadth, 1.11; depth of ventral valve, .94.”’ Supplementary descriptton—Shell thin; outline of valves, resting with the margins flat, semi-ellipsoidal in many specimens, in others much constricted toward the hinge- line. Ears small but rather distinctly set off from the rest of the shell by the upturning of the extremities or by a deep groove. Pedicle valve very convex, sharply rounded to subcarinate, highest near the center; curvature increased regularly from the anterior margin to the beak. Umbo large, projecting beyond the hingeline one-third to one- fourth the length of the shell; beak very small, projecting slightly over the cardinal area. Hingeline usually shorter than the width of the shell but occasionally as long. The length of hingeline in 7 average specimens varies from 17 mm. to 23 mm., the mode being 20 mm.; length of hingeline compared to greatest width 3:4 to 4:4; length of shell compared to greatest breadth 10:8 to 10:9. The curvature of the brachial valve is about half to two-thirds that of the pedicle; at the highest and narrowest part the shell is almost flat; the lateral edges are recurved and arched to meet the cardinal border. Surface marked by small, rounded to subangular, irregular, radiating plications, which increase in number by bifurcation and implantation; 12 to 18 plications to the centimeter. Size given by Swallow about one-tenth above average. Only one of our specimens has a ventral valve depth as great as listed by Swallow. Surface of shell punctate. ° Remarks—The species is readily recognized by the extreme projection back of the hingeline, small plications, and narrow hingeline. No other species of Stropheodonta in the fauna has an average length of hingeline compared to length of shell less than 50 per cent greater than this. Schuchert uses the specific name ‘‘navalzs’’ for this form, but the most characteristic feature, the projecting umbones, is not present in navalis. The ears are not strongly arched towards the area as in navalis and the cardinal line is generally shorter than the width of the shell while it is longer in navalis. Occurrence—Snyder Creek shale, Callaway and Montgomery Counties. Stropheodonta demissa (Conrad) Plate 11, figures 3 and 8; plate 14, figures 1-8. 1842. Strophomena demissa Conrad, Jour. Acad. Nat. Sci., Phila., VIII, p. 258, pl. 14, fig. 14, 1852. Strophodonta dimosa (?) Owen, Geol. Survey Wisconsin, Iowa and Minnesota, tab. 3a, fig. 14. 1857. Strophomena (Strophodonta) demissa Hall, Tenth Rep. N. Y. State Cab. Nat. Hist., pp. 137-139, figs. 1-2. 1858. . Strophomena demissa Rogers, Geol. Penna., II, p. 827, fig. 666. 1858. Strophodonta demissa Hall, Geol. Surv. Iowa, I, pt. 2, p. 495, pl. 3, fig. 5. 1860. Strophodonta quadrata Swallow, Trans. Acad. Sci., St. Louis, I, p. 639. 1867. Strophodonta demissa Hall, Pal. N. Y., IV, pp. 81 and 101, pl. 11, figs. 14-17; pl. 12, figs. 1-5; pl. 17, figs. 2a-2s. 78 THE DEVONIAN OF MISSOURI. 1880. Strophodonta demissa White, Second Ann. Rep. Indiana Bureau of Statistics and Geol., p. 500, pl. 4, figs. 6, 7. 1881. Strophodonta demissa White, Tenth Rep. Indiana State Geol., p. 132, pl. 4, figs. 6, 7. 1882. Strophodonta demissa Whitfield, Geo]. Wisconsin, IV, p. 327, pl. 25, fig. 18. 1889. Strophodonta demissa Nettleroth, ‘Kentucky Fossil Shells, Mem. Kentucky Geol. Survey, p. 143, pl. 18, figs. 10-16; pl. 33, fig. 22. 1892. Stropheodonta demissa Hall and Clarke, Pal. N. Y., VIII, pt. i pl. 14, figs. 7-12. 1895. Strophodonta demissa: Keyes, Geol. Survey Missouri, V, p. 70, pl. 39, fig. 7. 1897. Stropheodonta demissa Schuchert, Bull. U. S, Geol. Surv., 87, p. 421. 1907. Stropheodonta demissa Grabau and Shimer, North American Index Fossils, I, p: 207, fiz. 203: 1913. Stropheodonta demissa Prosser and Kindle, Maryland Geol. Survey, Middle and Upper Devonian, pp. 136-137, pl. 10, fig. 1; Clarke and Swartz, p. 551, pl. 47, fig. 14. Hall’s description—Somewhat modified in accordance with the specimens from the Missouri Devonian—Shell commonly semielliptical, usually wider than long, length and breadth often nearly equal, hingeline usually greater than the width of the shell in front, extremities often auriculate; in some specimens the sides are nearly straight, and parallel for more than half the length of the shell. Pedicle valve nearly flat to regularly convex, greatest elevation nearly central; umbo small, with the apex slightly incurved and extending beyond the area; surface a little concave towards the cardinal angles, which are slightly deflected. Dorsal valve moderately concave, closely following the convexity of the opposite valve; in some specimens an ill-defined median depression extends from beneath the apex to the front of the shell. Area of pedicle valve variable, usually of moderate width, varying from 1 mm. to 2 mm. wide in the centre in average specimens, and narrowing toward the extremities. Inner margin crenulated for nearly its entire length. There is no open delthyrium but a triangular space below the beak of many specimens marks its location. Dorsal area: narrow and usually linear, sometimes wider and sometimes narrower in the middle, and the margin for a short space free from crenulations. The planes of the two areas are inclined so as sometimes to give less than a right angle between them, but generally a a greater angle, and along the middle the two are often nearly in the same plane. Surface marked by numerous crowded striae, about nine or ten of which are much stronger and more elevated on the umbo of the pedicle valve, with finer ones coming in between and on either side; striae frequently increasing by intercalation and bifurca- tion until they become very numerous. The interior of the ventral valve, and casts of the same, show a large flabelliform divaricator muscular impression, which is somewhat widely separated in front, and each division distinctly lobed. The occlusor muscular impressions occupy a semielliptical space on each side of the narrow central depression, the marking on either side being double in well-preserved specimens. The upper extremities of this impression are close under the arch of the umbo, and separated by a smooth space from the diwaricator impressions. Beyond the muscular impressions, the interior surface is minutely pustulose, the points being more prominent just without their limits; beyond which, the course of the vascular impressions can be distinctly traced. In the brachial valve, the anterior and posterior occlusor muscular impressions are very conspicuous and deeply marked, and often limited by an elevated ridge, a narrow longitudinal ridge dividing the two parts. On each side, and below the muscular im- pressions, the surface is minutely pustulose, the vascular impressions becoming distinct towards the margin. The cardinal process is divided from the base, the divisions strongly diverging. BRACHIOPODA. 79 Remurks—This is a rare form in the Mineola and the individuals are always small, the maximum size collected measuring less than an inch along the hingeline. In the Callaway it is common and a tendency toward variation in several directions has ap- peared. In the Snyder Creek it is very abundant and S. boonensis Swallow, S. callaway- ensis Swallow, S. cymbiformis Swallow, S. navalis Swallow, S. inflexa Swallow and S. equicostata Swallow developed from it in a short time. None of the new species lived beyond Snyder Creek time. More than 1,000 specimens of these stropheodonts are in the collections of the University of Missouri and the variations present are remarkable as they all took place while 25 feet of shales and limestones were being deposited. Occurrence—Mineola of Warren, Montgomery, Ralls and Callaway Counties; Calla- way of Warren, Montgomery, Callaway, Boone and Moniteau Counties; Snyder Creek of Montgomery and Callaway Counties. Stropheodonta equicostata Swallow Plate 11, figure 6; plate 12, figures 9-17. 1860. Strophodonta aequicostata Swallow, Trans. St. Louis Acad. Sci., I, p. 639. 1860. Strophodonta quadrata Swallow, Ibid., p. 639. 1897. Stropheodonta callawayensis, quadrata and aequicostata Schuchert, Bull. U. S. Geol. Surv., 87, pp. 420 and 425. Swallow's description—‘‘Shell suborbicular, auriculate, with a sinus on each lateral margin anterior to the ears. Ventral valve subsemihemispherical, regularly convex, but most arched between the beak and the center; ears defined by a depression on this valve and the sinuses on the lateral margins; they are arched and but slightly change the regular contour of the valve; area straight, narrow, vertically striated, and common to both valves; umbo depressed; beak small, depressed. Dorsal valve very concave, following closely the curvature of the opposite valve, much flattened towards the cardinal border; lateral edges depressed and arched to form the concave surface of the ears; cardinal border slightly arched and finely crenulated. Surface marked by numerous small, rounded, granulated, radiating plications, and by very fine concentric striae, and imbricating plications of growth. Length, 1.18; breadth, 1.45; depth, .53; cardinal line, 1.20.”’ Supplementary descriptuon—The specimens which come nearest to other parts of Swallow’s description do not have projecting auriculations and as his measurements show the hingeline about 1/6 shorter than the maximum width of the shell, he probably meant only that the auriculations are distinct. The sinus anterior to the ear is not present on the most typical specimens of the group but occurs on a variety which grades towards S. cymbiformis Swallow. The most typical.examples have the hingeline about the same width as the shell but the variations seem to be towards shorter hingelines in every case. Three typical examples give the following measurements: Length, 24, 24, 26 mm.; length of hingeline 26, 28, 26 mm.; convexity 12,12,1444mm. Thegreatest width of specimen 3 is 2 mm. more than the width of the hingeline. One specimen of the cymbiformis type has a hingeline length of 17 mm. and a greatest width of 21 mm. A specimen with a hinge length of 13 mm., and a maximum width of 19 mm. is inter- mediate between S. cymbiformis Swallow and S. equicostata Swallow. The fine plica- tions are rounded to subangular and vary from 14 to 20 to the centimeter. None of the specimens has fine concentric striae though a few lines of growth are present. The ‘plications appear granulated on account of numerous very small pores. The varieties of this species grade toward S. cymbiformis Swallow but the typical forms are quite distinct and none of them has the umbo projecting prominently back of the hingeline. In another direction it grades toward S. demissa (Conrad) but differs from it in the much more strongly arched valves and shorter hingeline. Remarks—Schuchert uses the name S. callawayensis Swallow for this species, but callawayensts can not be positively identified among the Snyder Creek specimens from Swallow’s description and equicostata is easily identified. No specimens among our 1,000 80 THE DEVONIAN OF MISSOURI. has a very convex valve flattened near the anterior and lateral margins as described by Swallow for callawayensis. Swallow describes callawayensis as having “ears large, well defined, and arched towards the cardinal border’’ and as having ‘‘numerous small, rounded, granulated, radiating costae.’’ The specimens having ears of this description do not have fine plications but the plications run 8 to 14 to the centimeter with an average of about 10. Occurrence—Snyder Creek shale, Callaway and Montgomery Counties. Stropheodonta inequiradiata Hall Plate 11, figure 15; plate 14, figures 10 and 11. 1857. Strophomena (Strophodonta) inaequiradiata Hall, Tenth Rep. N. Y. State Cab. Nat. Hist., pp. 113-114, figs. 1-3. 1861. Strophomena inaequistriata Billings, Canadian Jour. Sci., Arts, VI, p. 338, fig. HHL 1863. Strophomena inaequistriata Billings, Geol. Canada, p. 367, fig. 375. 1867. Strophodonta inequiradiata Hall, Pal. New York, IV, p. 87, pl. 11, figs. 24-31 pl. 12, fig. 12; pl. 13, figs.-6-11. 1874. Strophomena inaequiradiata Billings, Pal. Fossils, II, p. 24, fig. 13; pl. 2, figs. 4 and 4a. 1883. Strophodonta inaequiradiata Hall, Second Ann. Rep. New York State Geol., pl. 45, figs. 13 and 14. 1884. Strophodonta inaequiradiata Walcott, Mon. U. S. Geol. Survey, VIII, p. 120, pl. 11, fig. 11. 1892. Stropheodonta inaequiradiata Hall and Clarke, Pal. New York VIII, pt. 1, pl. 14, figs. 13 and 14. ‘ 1897. Stropheodonta inaequiradiata Schuchert, Bull. U. S. Geol. Survey, 87, p. 422. 1909. Stropheodonta inaequiradiata Grabau and Shimer, North American Index Fossils, I, p. 216, fig. 259. Haill’s description—Shell semielliptical or ees oes more or less sabhais approaching a hemispheric form; cardinal extremities sometimes salient, but often rounded, and the cardinal line less than the width of the shell below. The ventral valve varies from moderately convex to gibbous, often forming a somewhat regular arch from beak to front, usually with the greatest convexity above the middle, depressed and often concave between the umbo and the cardinal extremities, which (in perfect shells) are somewhat salient; beak a little elevated above the hingeline, and incurved; area very narrow, linear, and finely crenulate. The dorsal valve is concave, often in a less degree than the convexity of the ventral valve; the disc sometimes very slightly concave, and abruptly deflected or almost geniculate towards the front. The surface presents much variety of character and aspect, both in the original shell and in its partial or entire exfoliation. The striae on the ventral valve are often coarse and uneven, somewhat fasciculate, and often rising in ridges which in the ex- foliated shell do not show the divisions. Some specimens have the striae sharp and slender, and nearly equal, with wider plain intermediate spaces. On the dorsal valve the striae are pretty uniform; the stronger ones being distant, sharp and elevated, with wide intermediate spaces marked by extremely fine regular striae, from the midst of which, as the shell increases, the elevated striae arise, dividing the space in which the smaller striae are constantly increasing by intercalation.” Remarks—The Mineola specimens are all internal casts of pedicle valves and are not well preserved. Only one shows the fine striations between plications as shown in figure 15 of plate 11. The most characteristic features of this shell are the increase of plications near the middle of the pedicle valve by implantation, and the fine striae that mark the spaces between the plications. Muscular impressions are preserved on all of the specimens but they are of little aid in identification. Occurrence—Mineola of Montgomery County. a a BRACHIOPODA. 81 Stropheodonta inflexa Swallow Plate 13, figures 13-17 1860. Strophodonta inflexa Swallow, Trans. St. Louis Acad. Sci., I, p. 637. 1897. Stropheodonta navalis boonensis Schuchert, Bull. U. S. Geol. Surv. 87, p. 425. Swallow's description—‘‘Shell semiellipsoidal, but a little wider in front, regularly arched and coarsely costated. Ventral valve very convex, semiellipsoidal, wider in front, highest near the center—regularly arched to the anterior margin, more abruptly at the posterior extremity, and somewhat flattened near the beak—very regularly arched transversely, but most abruptly on the obsolete mesial fold; ears very small, or obsolete; beak small, depressed; area straight, narrow, impressed, and common to both valves; umbo large and prominent. Dorsal valve semielliptical, less convex, slightly depressed in front; lateral edges recurved and slightly arched where they meet the cardinal line; cardinal line as long or shorter than the width of the shell, situated about one-third of the length of the shell from the posterior extremity. Surface marked with large sub-- angular, unequal, irregular, granulated costae, increased by implantations and sub- divisions; structure punctate. Length, 1.41; breadth, 1.21; depth of asmera valve, .83.”’ Rie aieneniary description—The specimens show the cardinal line about 1/5 the length of the shell from the posterior extremity rather than 1/3 as stated by Swallow but in other respects Swallow’s description is good. The species seems good and is easily distinguished from S. cymbiformis Swallow by its coarser plications, much broader arching, and broader form (length compared to breadth 9:10 to 10:10), and from SS. boonensis Swallow by its smaller plications, projecting umbo, shorter hingeline, and~ greater convexity. The plications run 8 to 12 to the centimeter as compared with 12-to 18 in S. cymbiformis Swallow and 6 to 12 in S. boonensis Swallow. It differs fron S. equicostata Swallow in having a much thicker shell, coarser plications, less prominent auriculations, and greatest convexity directly below the hingeline- Occurrence—Snyder Creek shale, Montgomery and Callaway Counties. Stropheodonta mineolaensis n. sp. Plate 12, figures 18-21 Shell of medium size, plano-convex to strongly concavo-convex, cardinal extremi- ties blunt, hingeline little longer than the greatest width of the shell. Pedicle valve with point of greatest convexity near the umbo, surface concave toward cardinal extremities, area narrow. Brachial valve flat to strongly concave, area very narrow. The plications constitute the distinctive feature of the species. Three or four plica- tions originate at the beak, and these form the dominant plications across the shell. By bifurcation these give rise to about 8 or 9 each and they remain in distinct groups. Outside these groups, on the cardinal extremities, the plications are faint or obsolete. The shells of greater convexity have stronger oe nearer the cardinal extremities than the less convex shells. The largest specimen in our collection measures 38 mm. in width, 24 mm. in length and 6 mm. in height. A convex specimen measures 22 mm. wide, 20 mm. long and 8 mm. in height. Hall described S. plcata from Iowa and this species poate it very closely. In the Snyder Creek shale are young specimens that would be referred to S. plicata Hall without question but the mature forms are S. callawayensis Swallow. Figures 2, 4 and 5 of plate 14 are of immature forms of S. demissa (Conrad), while figure 6 of plate 13 seems to be an immature specimen of S. boonensis Swallow. How- ever, it is always difficult and in many cases impossible to refer the immature specimens from the Snyder Creek shale to their proper species. In:S. plicata Hall, 6 to 8 plica- tions originate at the beak and as they pass outward and bifureate they do not form 82 THE DEVONIAN, OF MISSOURI. bundles as in S. mineolaensis. The major plications are subequal in size in S. plicata Hall, while about three plications are much the largest in S. mtneolaensts. The specimen figured by Kindle in the 25th Annual Report of the Indiana Depart- ment of Geology and Natural Resources, figure 2, of pee 6, may belong to the Mineola species rather than to S. plicata Hall. Occurrence—Mineola of Ralls County: The variation toward coarse plications was common with S. demissa (Conrad) but seems to have gone so far as to produce well-marked species with distinguishing features other than coarse plications in only a few cases. Three of these were in the Snyder Creek shale and one in the Mineola limestone. Stropheodonta navalis Swallow Plate 11, figure 7; plate 12, figures 4-8; plate 14, figure 12. 1860. Strophodonta navalis and subnavalis Swallow, Trans. St. Louis Acad. Sci., I, pp. 635. 1897. Stropheodonta navalis Schuchert, Bull. U. S. Geol. Surv. 87, pp. 424-425. Swallow's description—‘‘Shell rather large, thick semielliptical, carinate, punctate, costate. Ventral valve very convex, obtusely carinated, somewhat flattened towards the lateral margins; strongly arched from the beak to the middle, with a more gentle curve towards the anterior margin, where the carina is somewhat depressed and rounded; beak small, incurved slightly beyond the cardinal border; umbo large, projecting slightly beyond the cardinal border; ears distinctly defined and strongly arched towards the area; area straight, linear, common to both valves and vertically striate. Dorsal valve very concave, closely following the curvatures of the ventral, recurved along the cardinal margin, forming the concave surface of the ears; cardinal line as long or longer than the width of the shell. Surface marked by numerous subirregular, rounded, granular, radiating plications; but few originate at the beak of the ventral valve; the number is increased by subdivisions and implantations. The punctate structure is very obvious - where the shell is worn or exfoliated. Length, 1.40; breadth, 1.44; depth of ventral valve, .61.” Supplementary descrittion—The shell is rather thin in small specimens. The flat- tening toward the anterior margin is indistinct to obsolete. The umbo.is small in comparison with S. inflexa Swallow and S. cymbiformis Swallow. The plications are intermediate in size between S. boonensis Swallow and S. egutstriata Swallow averaging fewer than 10 to the centimeter. Some are rounded and some subangular. The dimensions of one average and one large specimen are: Length 28 and 39 mm.; breadth 32 and 42 mm.; height 15 and 18 mm. The width in each case is along the hingeline, both ends of eres are missing. The probable width exceeds the measure- ments by about 5 millimeters. This species resembles S. callawayensis Swallow, from which it differs in greater convexity, carinate pedicle valve, greater length compared to width, and more a nent umbo. Occurrence—Snyder Creek shale, Montgomery and Callaway Counties. Genus Pholidostrophia Hall and Clarke Pholidostrophia towaensts (Owen) Plate 11, figure 9 1852. Chonetes (?) iowensis Owen, Geol. Survey Wisconsin, Iowa, Minnesota, p. 584, pl. 3a, fig. 7. 1867. Strophodonta nacrea Hall, Pal. New York, IV, pt. 1, p. 104, pl. 18, fig. 1. 1897.. Pholidostrophia iowaensis Schuchert, U.S. G. S, Bull. 87, p. 308. bee BRACHIOPODA. 83 Hall's description—‘Shell small, semielliptical, having a brilliant nacreous lustre; hingeline crenulated, equalling or a little less than the greatest width of the shell below, and sometimes terminating in more or less distinct angles. Dorsal valve concave. Ven- tral valve sometimes regularly convex, flattened at the margins, often depressed-convex - in the umbonal region and abruptly arched towards the front; beak very small and de- pressed; area very narrow, linear, without foramen. The area of the dorsal valve is often nearly as wide as that of the ventral valve. Surface apparently smooth, but under a lens showing very faint concentric lines of growth, with sometimes obscure traces of radiating lines. The muscular impressions in the ventral valve extend more than half the length of the shell. The divaricator muscular imprints are deeply depressed, elongate-ovates narrowing above and somewhat widely separated below; while the occlusor impressions are narrow-ovate spots on the thickened portion of the shell, and below these extends a narrow elevated band separating the other impressions. In the dorsal valve, the anterior and posterior occlusor muscular impressions are small and not strongly defined. The cardinal process is slender, bifurcating, with a narrow rounded ridge extending from its base down the middle of the valve. The interior of the shell, excepting the muscular impressions, is studded with prominent scattered granules or papillae.. The crenulations on the hingeline are rather distant, but conspicuous.” Occurrence—Specimens of this species are rare in the Mineola limestone of Mont- gomery County. Genus Strophonella Hall Strophonella crassa Rowley Plate 11, figures 12, 13 and 14. 1894. Strophonella crassa Rowley, Am. Geologist, XIII, p. 153, figs. 4-6. 1897. Sitrophonella crassa Schuchert, U.S. G. S. Bull. 87, p. 438. 1909. Strophonella crassa Greger, Am. Jour. Sci., X XVII, p. 377. ; Rowley's descriptton—‘‘Shell semicircular, slightly eared at the cardinal extremities. Heavy and thick for a species of this genus. Dorsal valve slightly concave from the obsolete beak to the middle, convex beyond. Striae numerous, rather small and indis- tinct on both valves, probably due in part to the state of preservation of the type. Ven- tral valve low-convex behind the beak, flat toward the circumference. Beak not in- curved, slightly elevated, giving a wide, low, triangular cardinal area. Both valves have areas but there is no deltidium. This species is apparently nearly related to S. reversa Hall, but is much larger form, with less concavity to the dorsal valve and less convexity to the ventral valve.” Remarks—The writer has examined only one specimen of this species, one of Mr. Rowley’s paratypes. The pedicle opening is about twice as high in the pedicle valve as in the brachial and is completely closed by stony matter in both. Occurrence—Snyder Creek shale, localtity 1, Callaway County. Genus Schuchertella Girty Schuchertella arctostriata (Hall) Plate 15, figures 8, 9, 12; plate 24, figures 18-23. 1843. Strophomena arctostriata Hall, Geol. N. Y., Rept. Fourth Dist., p. 266, fig. 3. 1897. Orthothetes chemungensis arctistriatus Schuchert, Bull. U. S. Geol. Surv., 87, pl. 296. 1909. Schuchertella arctostriata Grabau and Shimer, North American Index Fossils, I, pp. 229-230, figs. 280 a and b. 1911. Schuchertella chemungensis arctistriata Cleland, Bull. 21, Wisconsin Geol. Surv., p. 91, pl. 16, fig. 15. 84 THE DEVONIAN OF MISSOURI. Hall's description—“Shell semicircular or semielliptical, frequently unsymmetrical, the proportions of length and breadth varying in different individuals; hingeline straight, nearly or quite equal to or greater than the greatest width of the she'l; sides nearly rectangular to the hingeline, or curving inwards. Ventral valve more or less convex towards the umbo and sometimes in the middle, curving downwards or flattened towards the front and sides of the shell; beak often distorted; area vertical or inclined forwards or backwards, usually unequal on the two sides of the foramen, which is closed by a strong convex deltidial plate. Dorsal valve depressed convex, sometimes nearly flat and sometimes very convex, with a narrow linear area; socket-plates strong, and sup- porting the cardinal process, which is double and has sometimes a faint ridge between the two divisions, which are themselves very short. Surface marked by sharp close radiating crenulated striae, which increase mainly by interstitial additions.” ‘ Remarks—The interiors are not preserved in any of the specimens from Missouri. The outstanding features of the shells are the crenulated striae which increase by interstitial additions, the shape of the valves, and the strong convex deltidium. It differs from Schuchertella parva from the Iowa Devonian in having a low area with the shell not distorted. Specimens of a Schuchertella from the Lime Creek shale of Iowa agree in every respect with the Missouri specimens but not with Hall’s description of S. parva. It is possible that a large’series of specimens from the Lime Creek would show that S. parva (Hall) isa synonym of S. arctostriata (Hall). Hall used only one specimen for illustration and description. Occurrence—Snyder Creek shale of Callaway County. Schuchertella cf. pandora (Billings) Plate 11, figures 5 and 14. | 1860. Streptorhynchus pandora Billings, Canadian Jour., V, p. 226, figs. 12, 13. 1863. Streptorhynchus Pandora Billings, Geol. Canada, p. 369, fig. 384. 1867. Streptorhynchus pandora Hall, Pal. New York, IV, pp. 68-70, pl. 4, figs. 11-19; pl. 9, figs. 18-25, 27. 1874. Streptorhynchus pandara Nicholson, Pal. Prov. Ontario, p. 70. 1883. Streptorhynchus chemungensis var. pandora Hall, Second Ann. Rep. N. Y. State Geol., pl. 40, figs. 1-6. 1892. Orthothetes chemungensis var. pandora Hall and Clark, Pal. New York, VIII, pt. 1, p. 255, pl. 9, fig. 30; pl. 10, figs. 1-6. ; 1897. Orthothetes pandora Schuchert, U.S. Geol. Surv., Bull. 87, p. 298. 1909. Schuchertella pandora Grabau and Shimer, North American Index Fossils, I, p. 229, fig. 279. 1912. Schuchertella pandora Kindle, Bull. U. S. Geol. Surv., 508, p. 76, pl. 3, figs. 7 and 8. Hall's description—‘‘This shell, in its symmetrical form is somewhat semioval, the length and width being about as four to five. A well-formed specimen, of one inch in length, measures one and a quarter inches in width; hingeline equal to the greatest width of the shell, and forming right angles with the sides, which are usually nearly straight; the front broadly rounded; cardinal extremities sometimes a little salient, and sometimes rounded. Ventral valve convex on the umbo, the greatest convexity being at the apex, from which the surface slopes in a regular plane to the sides and middle of the shell, becoming slightly concave below the middle of the shell, becoming slightly con- cave below the middle and along the front; area large triangular, extending the entire length of the hingeline, and inclining over the dorsal valve at an angle of about 110°. The foramen has been large, about twice as wide at the base as the height, and is closed by a convex deltidium. Dorsal valve moderately convex, a little flattened towards the cardinal extremities, and curving towards the sides and front; area narrow and linear. eee ae BRACHIOPODA. 85 Surface striated by numerous fine strongly elevated striae, which are increased by bifurcation and interstitial additions, and crenulated by fine closely arranged con- centric striae. The interior of the ventral valve is marked by strong dental lamellae and a broad flabellate muscular impression, which, in well-preserved specimens, shows the cordiform imprint of the adductors, and a short low mesial septum in the upper part. The interior of the dorsal valve preserved deep dental sockets, with thick secket- plates which support the duplicate cardinal process, each division of which is grooved at the extremity. There is likewise a small process between the two branches of the cardinal process; and below the hingeline, the flabelliform muscular impression is divided by a low rounded mesial longitudinal ridge or obsolete septum. Remarks—The specimens identified with S. pandora are so rare, and imperfectly preserved that a comparison is more nearly the correct word than identification. Occurrence—Rare in the-Mineola of Warren and Montgomery Counties. Famiiy Productidae Genus Productella Hall Productella callawayensis (Swallow) Plate 11, figures 10 and 16; plate 15, figures 10, 11, 13 and 14 1860. Productus Callawayensis (Swallow), Trans. St. Louis Acad. Sci., [, p. 640. 1894. Productella marquessi Rowley, Am. Geologist, XIII, p. 153, figs. 7 and 8. 1894. Productella subalata Keyes. Geol. Survey Missouri, V, p. 52. 1897. Productella marquesst Schuchert, Bull. U. S. Geol. Surv., 87, p. 316. 1909. Productella marquessi Greger, Am. Jour. Sci., XX VII, p. 376. 1909. Productella callawayensis Greger, Am. Jour. Sci., XXVII, p. 376. Swallow's description of P. callawayensis—‘‘Shell small, thin, depressed, spinose, varying from semiorbicular to suborbicular. Ventral valve very regularly convex, but most so on the umbo, flattened towards the ears; break small, incurved to or slightly over the cardinal line; umbo small, prominent, projecting a little back of the cardinal line; ears large flattened triangular, slightly arched towards the cardinal line, rounded on the outer angle; mesial sinus obsolete, or entirely wanting. Dorsal valve regularly concave, most depressed in the middle in adult specimens, but nearer the beak in the young; ears well defined, triangular, slightly arched; cardinal line as long or shorter than the width of the shell; curved at the extremities towards the lateral margins and down towards the center of the ventral valve. Surface marked with small, irregular, iterrupted corrugations and striae; both valves thickly set with depressed spines, whose bases are more or less prolonged into longitudinal plications; spines on the dorsal valve, smaller. Length, .85; breadth, 1.12; thickness, .40.” Rowley’s description of P. marquessi—‘‘This small shell is subcircular in outline. Cardinal line of a little less length than the greatest width of the shell. Ventral valve without striae but provided with a few slender spines, convex. Beak incurved. Cardinal area very narrow, scarcely appearing more than a line. Dorsal valve deeply concave, apparently without striae or spines. Lines of growth cross both valves. This little Productella resembles P. pyxidata Hall from the Lithographic limestone, but is much smaller and from a lower horizon. Length of type 5/16, width 6/16 of an inch.” Description—Shell usually small but ranging to large, the small shells about equi- dimensional but the large ones wider than long, the hingeline a little shorter than the greatest width. Average specimens are about 7 mm. wide by 7 mm. long with a con- vexity of the pedicle valve of about 3 mm. The largest specimen in the collection of 86 THE DEVONIAN OF MISSOURI. the University of Missouri if 40 mm. wide, 28 mm. long, with a convexity of the pedicle valve of 13 mm. . Pedicle valve strongly convex in small specimens, moderately convex in large, great- est convexity posterior to the middle; the umbonal region projecting considerably beyond the hingeline; cardinal extremities well differentiated in large specimens, not differentiated in small; no mesial sinus; beak small and strongly incurved. Brachial valve moderately concave, with the surface slighly deflected towards the cardinal extremities. The cardinal process is small, bifid, each division excavated longi- tudinally on its outer surface. From the base of the cardinal process a pair of shallow furrows extends outward at an angle of about 80° from the median line of the shell to near the cardinal extremities and back of the furrow a low ridge forms its boundary. From the base of the cardinal process an illdefined furrow runs forward for about one- fourth the length of the shell, where it is replaced by a sharp-topped narrow low median — septum which extends about one-third the length of the shell. The brachial impressions are weak and extend about three-fourths the width and length of the shell. The inner surface is covered by radiating papillae. Surface of both valves marked by a few lines of growth. Spines slender, numerous, arranged in irregularly concentric and radiating lines. A specimen 19 mm. wide has one spine 1/8 mm. in diameter and 214 mm. long preserved. The spines are recumbent and often against the shell for one or two millimeters. The brachial valve spines are not infrequently missing, but all well preserved specimens have them. Remarks—This species differs from P. subalata Hall of the Cedar Valley limestone in the abundance of spines, slenderness of spines, recumbency of spines, much less con- vexity, and greater comparative width of large specimens. Rowley’s P. marquessi seems to belong with Swallow’s species. The absence of spines on the brachial valve would be sufficient to differentiate it, but many of the specimens of P. callawayensis Swallow show only very faint spines owing to poor preservation. This is shown in figure 13 of plate 15. : Occurrence—Snyder Creek shale of Callaway County. Productella spinulicosta Hall 1854. Productus subaculeatus Norwood and Pratten (non Murchison), Jour. Acad. Nat. Sci., Philadelphia, III, p. 21. 1857. Productus spinulicostac Hall, Tenth Rep. N. Y. State Cab. Nat. Hist., p. 173. 1867. Productella spinulctosta Hall, Pal. New York, IV., pt. I, p. 160, pl. 23, figs. 6-8, 25-34. 1897. Productella spinulicosta Schuchert. U. S. Geol. Surv., 87, p 318. 1901. Productella spinulicosta Kindle, Indiana Dept. Geol. Nat Res., 25th Ann. Rept., pp. 629-630, pl. 6, figs. 9 and 9a. 1903. Productella spinulicosta Clarke, N. Y. State Mus., Bull. 65, p. 292. 1909. Productella spinulicosta Grabau and Shimer, North American Index Fossils, I, p. 241, figs. 293c, d. 1913. Productella cf. spinulicosta Prosser and Kindle, Maryland Geol. Survey, Middle and Upper Devonian, ppl. 162-163, pl. 13, figs. 17-20. Hall’s description—‘‘Ventral valve gibbous, length and breadth about as seven to eight; hinge extremities angulated, and the margins being contracted a little below form small ears, while below this contraction the sides are regularly curved and the front is broadly rounded. The umbo is considerably elevated above the hinge line and the apex incurved. Surface marked by closely arranged concentric striae and studded with slender rounded spines. On the upper part of the shell and on the ears these spines are round at the base, and rise directly from the surface. On the middle and lower part of the valve there is a slight elevation of the surface a little above the base of the spine, BRACHIOPODA. 87 but not a defined ridge. The number of spines on the individual figured has been sixty or more.” Remarks—The specimens identified as P. spinulicosta Hall are rare and in most cases not well preserved. They are all small. Occurrence—Mineola of Montgomery and Warren Counties. Superfamily Pentameracea Family Pentameridae Genus Pentamerella Hall Pentamerella arata (Conrad) Plate 16, figure 16; plate 17, ftgures 17-23 1841. Atrypa arata Conrad, Fifth Ann. Rep. Geol. Survey N. Y., p. 55. 1867. Pentamerella arata Hall, Pal. New York, IV, pt. 1, p. 375, pl. 58, figs. 1-21. 1897. Pentamerella arata Schuchert, U.S. G. S. Bull. 87, p. 302. 1901. Pentamerella arata Kindle, Indiana Dept. Geol. Nat. Res., 25th Ann. Rept., p. BiS.ipk 7, fp. 2. 1909. Pentamerella arata Grabau and Shimer, North American Index Fossils, I, pl. Did, S357. Hall's description—‘‘Shell ovate, more or less convex or gibbous, becoming arcuate ovoid in old shells; the width greater or less than the length; hingeline variable. Ventral valve gibbous and somewhat regularly convex in the young shells, becoming ventricose in old shells, with a mesial sinus which is more or less developed. In old shells the form is extremely arcuate and the beak strongly incurved; in shells of medium size the beak is _ obtuse, limiting the apex of the triangular fissure. There is a narrow area bordering the fissure and the space on either side between the hingeline and its apex is often flat- tened and sometimes distinctly limited by a faint elevation; fissure large and nearly covered by the beak of the opposite valve. Dorsal valve in young shells more or less convex, and sometimes gibbous in the upper part, and often moderately convex in older shells; mesial fold usually well defined in the lower half of the valve, sometimes reaching nearly to the apex; in young shells there is rarely a short sinus in place of the mesial elevation. Surface plicated by rounded or angular plications, which sometimes reach nearly or quite to the beak but are often only developed below the first third of the length; plications usually bifurcated; the bifurcations irregular or unequal. The interior of the ventral valve has an elongate spoon-shaped pit, the inner extremity of which. is free for a considerable extent and the upper part supported on the central septum which usually extends less than half the length of the shell from the apex. In the dgrsal valve the crura or lamellae are joined at their bases, making a V-shaped trough or pit, which is attached to the valve in its upper part and continues sessile for about one-half _the length of the shell.” Remarks—This species is abundant in the Mineola. It is extremely variable in size, shape and plications. The largest specimen is 28 mm. long by 35 mm. wide, while average specimens are about 14 mm. long by 14 mm. wide. Some specimens have no more than 8 plications to a valve while others have 25; in some the plications are very strong (see figure 18) while in others they are scarcely visible (see figure 22). In some the plications extend two-thirds the length of the shell while in others they are confined to the margin. Occurrence—Abundant in the Mineola of Montgomery and Ralls Counties. 88 THE DEVONIAN OF MISSOURI. Pentamerella missouriensis n. sp. Plate 24, figures 1-4; plate 23, figure 5S. Descriptsuon—General outline of the shell ovate, narrower at the pedicle end, width 16 mm., length 16 mm. Pedicle valve moderately convex with the greatest convexity directly above the hingeline. A shallow sinus originates about the middle and occupies a little less than half the width of the shell at the front margin. The back two-fifths of the valve is narrow and projects more than one-third the length of the shell back of the hingeline. The beak is strongly incurved but not over the hingeline. Two faint plications extend back from the margin in the sinus for about one-fourth the length of the shell. Strong plications form the margins of the sinus for about one-fourth the length of the valve. On one side of the sinus there are two strong plications and on the other side three that are not so strong. The plications bounding the sinus are the strongest. The sinus part projects 6 mm., or three-eights the length of the valve in front of the rest of the valve. The hingeline is 6 mm. long, three-eights the width of the shell The brachial valve is elliptical in outline. Along the top of the fold it is nearly straight. The fold originates about the middle of the valve and in a distance of 6 mm. rises to a height of 5mm. The sides are very abrupt and the top is rounded. Outside the fold the valve slopes gently to the margins. The right half of the valve is missing. On the left there is one plication 3 mm. long and another very faint one of about the same length. Holotype, one imperfect specimen. Snyder Creek shale of Callaway County. Pentamerella fultonensts n. sp. Plate 16, figures 21-23; plate 24, figures 10-12 Descri ption—General outline of the shell subovate, narrower toward the pedicle end, gibbous, width and length subequal. Pedicle valve strongly convex, with the greatest convexity slightly in front of the hingeline. A shallow sinus originates near the middle and occupies more than one-third the width of the shell at the front margin. The beak is strongly incurved but not over the hingeline. A very short median septum is present. The brachial valve is much less convex than the pedicle. The beak projects beyond the hingeline and the greatest convexity is a short distance in front of the hinge- line. A fold that is inconspicuous in some specimens, and strong in others, appears near the front of the valve. Faint indications of rather small plications appear. on both valves but are not apparent to the naked eye. The interior of the pedicle-valve has a spoon-shaped pit that extends about one-half the length of the shell. In the brachial valvg the crura are united at their bases, making a V-shaped or U-shaped trough which is attached to the valve at the upper part and extends for about one-half the length of the shell. The most striking peculiarity of the shell is the lack of plications visible to the naked eye, and it should, perhaps, be referred to the genus Clorinda. Occurrence—Callaway limestone, Callaway County. — BRACHIOPODA. 89 Fig. 6. Sections of Pentamerellas. 1-5. Pentamerella arata (Conrad). Sections of a small specimen from the Mineola . The brachial valve was 1144 mm. long and the sections were made 1 mm., 31% mm., 4.5 mm., 46 mm. and 5.2 mm. from the beak. The septae continue for less than one millimeter in front of the last section. 6. Pentamerella arata (Conrad). Section near the beak of a specimen from the Jeffersonville beds of Indiana. 7-12. Pentamerella fultonensis Branson. Sections of a specimen with a brachial valve 14 mm. long. The sections were made 1.5 mm., 2.1 mm., 3.2 mm., 5 mm., 5.7 mm. and 6.3 mm. from the beak. All sections are arranged in series with the smaller numbers nearer the beak. Genus Gypidula Hall Gypidula marionensis Greger Plate 16, figures 17-20. 1920. Gypidula marionensis Greger, Am. Jour. Sci., vol. 50, p. 24. Description—Shell small subglobose, the pedicle valve much more convex than the brachial. In old specimens the convexity of the pedicle valve is proportionately much greater than in young specimens. The beak of the pedicle valve is strongly. in- curved but ordinarily not overlapping the beak of the brachial valve. A very short median septum. The shell is smooth and has no indication of fold or sinus. The brachial valve is much less convex than the pedicle. It is smooth and has no fold or sinus. The crural plates and septae extend about half the length of the valve and are nearly parallel, though the septae converge to form a point at their anterior end. The dimensions of an average specimen are: Length 10 mm., width 9 mm., thick- ness 9.5 mm. A specimen with an unusually large pedicle valve measures: Length 9 mm., width 10 mm., thickness 12 mm.; in this specimen the height of the pedicle valve is 9 mm. The distinguishing feature of this species are its smoothness, small size, and unusual height of the pedicle valve. Greger published no description or figure. Occurrence—Abundant in the Cooper of Monroe County. 90 THE DEVONIAN OF MISSOURI. Fig. 7. Sections of Gypidula marionensis Greger. 1-3. Gypidula marionensis Greger. Sections of the brachial valve showing the extent of the loop. Fig. 1 is of a different specimen than figs. 2 and 3, and is cut near the top of the valve. The dotted areas represent the cut edge of the shell. 4and 5. Gypidula marionensis Greger. Transverse sections in front of the short median septum of the pedicle valve, showing the spondylia. Gypidula mineolaensis n. sp. Plate 23, figures 6, 10, 11 Description—Pedicle valve moderately convex, the summit of the convexity directly above the hingeline, from which the sides slope abruptly to the beak and cardinal margins and gently to the other margins. The umbo projects strongly beyond the hingeline. The beak is small and only slightly incurved. A very short median septum is present. The cardinal area is small and rounds imperceptably to the rest of the shell. The delthyrium is wide and low. There is no fold or sinus on the specimens collected. The valve is marked by about 30 low angular plications which extend more than half way to the beak in the middle of the shell but a much shorter distance near the margins. Only two brachial valves are in our collection, and they are imperfect. The shell is much less convex than the pedicle valve. It is marked by similar plications and has no fold or sinus. Remarks—The species resembles Gypidula multicostata Dunbar but the plications extend only a short distance on the shell; fold and sinus are not present; the plications extend to the cardinal margins, and the shell is much wider compared to the length. Occurrence—Mineola of Ralls County. — Order Telotremata Superfamily Rhynchonellacea Family Rhynchonellidae Genus Camarotoechia Hall and Clarke Camarotoechia depressa (Kindle) Plate 24, figure 16. 1901. Rhynchonella depressa Kindle, Ind. Dept. Geol. Nat. Res., 25th Ann. Rept., pp. 589-590, pl. 7, figs. 5, 5a, Sb. Kindle’ s description—‘‘Shell small, flattened, trigonoid-subovate in outline; cardinal lines forming nearly a right angles at the beak, the front uniformly rounded; length BRACHIOPODA. 91 and breadth about equal. Ventral valve most convex at the umbo from which it slopes regularly to the front and sides; sinus wide and very shallow or entirely obsolete, marked by five or six plications; beak acute extended and slightly incurved. Dorsal valve very slightly convex, beak incurved beneath the umbo of the opposite valve. Mesial fold obsolete or represented by a very low broad elevation near the front, marked by five or six plications.’ Surface covered by from 16 ue 25 plications on each valve. These are crossed by numerous fine concentric striae.’ Remarks—Only one specimen of this species has been calllenegd during the present investigation. It is slightly crushed but seems to differ in no respect from Kindle’s species though its occurrence so much higher in the geologic column is remarkable. Occurrence—Snyder Creek shale of Callaway County. Camarotoechia gregert n. sp. Plate 24, figures 5-9 Description—Shell of medium size, subquadrate in outline, usually wider than long; proportions of width to length 6-5 to 5-5. The dimensions of three specimens are: Length 16 mm., 15 mm., 12 mm., breadth, 17 mm., 17 mm., 12 mm.; height 10 mm., 9 mm., 8 mm. Pedicle valve slightly convex; beak pointed and HD tecse sinus of moderate depth, originating slightly back of the middle and projecting prominently in front of the rest of the valve. Three or four rounded plications occur in the sinus in most specimens, one on each slope, and 6 or 7 on either side of the sinus. The total number of plications ranges from 17 to 20. - Brachial valve regularly convex from beak to front. The fold originates about the middle and is sharply set off from the rest of the shell near the front. It forms part of the regularly convex surface. There are four plications which occur on the top of the fold, and usually, one on each flank. The usual number of plications on the valve is 18 and none of our specimens vary more than 2 from that number. This species resembles Camarotoechta contracta Hall but differs from it in the project- ing fold, in having plications on the sides of the fold and sinus, and in the quadrate shape with the top of the beak forming one angle of a rectangle. Greger! seems to identify the Snyder Creek specimens with Camarotcechia scitulus Cleland, but that species has 24 plications, not including those on the fold and sinus, while this species has only 14 or 16 at the most. Occurrence—Rare in the Snyder Creek shale of Callaway County. Genus Hypothyris King Hypothyris gregeri n. sp. Plate 17, figures 5-7, 11-14 Description—Shell small, subglobose; width equal to the length in young forms, greater than the length in old. Four specimens give the following measurements in millimeters; 1 width, 2 length, 3 thickness. 11-9.5-8.7; 12.2-11, 9.5; 9-9-7; 9-9-7.3. In the pedicle valve the sinus affects only the front margin of the shell. It isshallow, occupies more than half the width of the shell and is flat on the bottom. Beak pro- jecting slightly back of the hingeline, not incurved. Plications rounded, simple, fairly strong on the margin but become faint and obsolete about the middle of the shell; four are present in the sinus and four on each lateral slope. The dental plates are short and the median septum extends about 1/3 the length of the valve, as shown in figure 7 of plate 17. 1Am. Jour. Sci., 49, p. 266. 92 THE DEVONIAN OF MISSOURI. In the brachial valve the fold originates about the middle of the shell in young specimens and is low and inconspicuous. The beak is short and incurved against the opposite valve. The plications are similar to those on the opposite valve—five plica- tions on the fold. The median septum extends forward about 1/3 the length of the shell. Occurrence—Rare in the Callaway limestone of Callaway County. Genus Pugnoides Weller Pugnoides altus (Calvin) Plate 16, figures 10-12 1875. Ryhnchonella alta Calvin, paper read before the Iowa Acad. Sci., and a named photographic plate distributed. 1890. Rhynchonella pugnus, var. alta Williams, Bull. Geo. Soc. wes I, pl. 12, figs. 5-7. 1894. Pugnax altus Hall and Clarke, Pal. New York, VIII, pt. 2, p. 203, pl. 60, figs. 1-5. 1897. Pugnax pugnus alta Schuchert, Bull. U. S. Geol. Surv. 87, p. 335. 1909. Pugnax altus Greger, Am. Jour. Sci., 27, p. 376. 1913. Pugnax pugnus var. altus Clarke and Swartz, Maryland Geol. Survey, Middle . and Upper Devonian, pp. 583-584, pl. 54, figs. 17-22. Description—Shell subelliptical to subcircular; length and breadth subequal; greatest width near the middle. Pedicle valve slightly convex near the hinge, with a sinus beginning near the middle and becoming deep at the front. Beak prominent, slightly incurved, projecting slightly beyond that of the opposite valve. Brachial valve more convex than the pedicle; fold beginning near the front and only slightly elevated. Plications coarse, usually 2 in the sinus, 3 on the fold and 2 or 3 on each lateral slope. In most specimens the plications are marginal but in some they extend to the middle of the valve. Remarks—This is a rare form and during the investigation it has been collected only from the Craghead Creek locality from a thin bed of shale near the top of the Snyder Creek shale. As it has a median septum in the pedicle valve, it belongs to Weller’s genus Pugnoides. Pugnoides swallovi n. sp. 3 Plate 16, figures 13-15 Description—Shell small, subtriangular in outline, usually slightly longer than wide, the greatest width anterior to the middle, usually thin but in some cases thick. The dimensions of three specimens are: Length 8 mm., 7mm., 6 mm.; width, 8 mm., 6 mm., 7 mm.; thickness, 7 mm., 5 mm., 3 mm. Pedicle ete slightly convex; beak panied and slightly incurved; sinus shallow and present only on the anterior margin; a projection of the front of the sinus reaching far into the brachial valve; median septum about one-third the length of the valve. Brachial valve slightly convex, highest at the front margin; beak small, incurved below that of the pedicle valve; mesial fold low and present only near the front margin; a well developed median septum for about half the length of the valve. Plications on the smaller shells inconspicuous, on the larger 2 to 3 in the sinus, 3 on the fold, and 3 to 5 each side of the fold and sinus. The best developed plications extend less than half the length of the shell. No other surface markings appear on the specimens studied. Remarks—This is a rare form, only 5 specimens having been collected. It does not resemble closely any other species from the Devonian of America. Occurrence—Mineola of Montgomery and Ralls Counties. ee ee ual Pan se — BRACHIOPODA. 93 Superfamily Terebratulacea Family Centronellidae Genus Newberria Hall Newberria missouriensis Swallow Plate 18, figures 1-4 1891. Newberria missouriensis (Swallow MS.) Hall, Tenth Ann. Rep. N. Y. State Geol., p. 7, extract, pl. 5, figs. 10-12. 1894. Newberria Missouriensis Hall and Clark, Pal. New York, VIII, pt. 2, p. 263, pl. 78, figs. 21-23. 1897. Newberrya missouriensis Schuchert, Bull. U.S. Geol. Surv., 87, p. 272. Swallow's description—‘Shell elongate oval; valves convex, usually gibbous in the umbonal region, sometimes depressed. Brachial valve equaling if not exceeding in convexity the opposite valve. The convexity of both valves is greatest in the median axis, the slopes to the lateral margins being quite abrupt; over the pallial region there may be a slight median flatten- ing on both valves. . Umbo of the pedicle-valve quite pronounced, more so than in the other species. Surface of both valves smooth, without evidence of concentric wrinkles. Interior markings, muscular scars and vascular ridges and furrows having about the same degree of development as in N. Johannis. This species is a larger, more robust and rotund shell than N. Johannis and is less elongate and more turgid than R. Jaevis.” Supplementary description—Shell a little longer than wide; greatest width about one-third the length of the shell from the back; narrowing slightly towards the hinge- line from the widest part.- The convexity of the pedicle valve varies considerably, the highest part usually appearing about one-third the length of the shell from the back but in some cases being in front of the middle; large specimens measure 10 cm. long, 10 cm. wide, and 7 cm. thick. The smaller specimens are more easily collected than the larger and those figured by Hall were small. The specimens figured in this report are of medium size. Remarks—Specimens of this species have been found, during the present investi- gation, only along Cedar Creek from about 7 miles southeast of Ashland up creek for about 6 miles. It occurs near the bottom of the Callaway and is abundant enough to make up the larger part of a limestone.about 10 feet thick. Specimens are so abundant and so badly crushed together that few good ones have been found. This is the largest of the Devonian brachiopods of Missouri. Occurrence—Lower part of Callaway limestone, eastern Moniteau, western Calla- way and eastern Boone Counties. Family Terebratulidae Genus Eunella Hall and Clarke Eunella lincklaeni (Hall) Plate 20, figures 12-16 1860. Terebratula lincklaeni Hall, Thirteenth Rep. N. Y. State Cab. Nat. Hist., p. 88. 1861. Cryptonella lincklaeni Hall, Fourteenth Rep. N. Y. State Cab. Nat. Hist., p. 101. 1867. Cryptonella (?) lincklaeni Hall, Pal. N. Y., IV, pt. 1, p. 397, pl. 60, figs. 49-65. 1867. Terebratula lincklaeni Hall, Pal. N. Y., 1V, Corrigenda. 1894. Eunella Lincklaeni Hall and Clarke, Pal. N. Y., VIII, pt. 2, p. 290, pl. 80, figs. 28-32. 94 THE DEVONIAN’ OF MISSOURI. 1897. Eunella lincklaeni Schuchert, Bull. U. S. Geol. Surv., 87, p. 223. 1901. Eunella lincklaeni Kindle, Ind. Dept. of Geol. and Nat. Res. 25th Ann. Rept., p. 658, pl. 12, figs. 3, 3a. 1909. Eunella lincklaent Grabau and Shimer, North American Index Fossils, I, p. 303, fig. 378. . 1911. Eunella licnkiaent Cleland, Wisconsin Geol. and Nat. Hist. Survey, Bull. No. Piles ous 12k 1913. Ewunella lincklaeni Prosser and Kindle, Maryland Geol. Survey, Middle and Upper Devonian, pp. 179-181, pl. 15, figs. 18-25. Hall’s description—‘‘Shell ovate or subelliptical, usually broader below’the middle, varying from moderately convex to very gibbous and sometimes subcylindrical; front rounded subtruncate or a little depressed. Ventral valve varying from moderately convex to gibbous, somewhat regularly arcuate in longitudinal outline, sometimes a little flattened towards the front or marked by a narrow mesial depression. Beak more or less abruptly incurved and truncated by a foramen of moderate size; umbonal slope rounded or subangular, and concave towards the cardinal margin. Dorsal valve vary- ing from moderately convex to gibbous; the greatest convexity about the middle of the length, and thence curving regularly to the sides and base. Surface marked by fine con- centric striae of growth, which are sometimes crowded together towards the front, causing a thickening of the shell. Shell structure distinctly punctate. This species presents some variety of form from subelliptical to broad ovate. The length of a large individual is a little more than three-fourths of an inch, with a width of five-eighths of an inch and a depth of three-eighths; while another form which I[ refer to the same has a length and width of half an inch with a depth of a little more than a quarter of ‘an inch. Some of the smaller individuals are a little more than a quarter of an inch in length.” , Remarks—Eunella lincklaent is abundant in the Mineola of Callaway and Mont- gomery Counties. Most of the specimens are small, averaging less than 13 mm. in length, though the largest specimens are as large as Hall’s largest. Many specimens were ground so as to show the loop and other internal structures. No specimens were preserved in such a way as to show such structures without grinding. Occurrence—Mineola of Montgomery, Callaway and Ralls Counties. Genus Cranaena Hall and Clarke Cranaena calvini (Hall and Whitfield) Plate 16, figures 3-5; plate 18, figure 5 1873. Cryptonella Eudora Hall and Whitfield (non Hall, 1867), 23rd Rep. New York State Cab. Nat. Hist., p. 225. 1875. Cryptonella Calvint Hall and Whitfield, Ibidem, p. 239. 1891. Cryptonella Calvini Whiteaves, Cont. Canadian Pal., I, pp. 235-236. 1894. Dielasma Calvinia Hall and Clarke, Pal. New York, VIII, pt. II, pp. 294-296, pl. 80, figs. 20-22. 1897. Duzelasma calvini Schuchert, U.S. G. S. Bull. 87, p. 212. 1908. Cranaena mors Greger, Am. Jour. Sci., XXV, pp. 313-314, figs. 1-7. 1909. Cranaena morsit Greger, Am. Jour. Sci., X XVII, p. 376. Greger’s description of Cranaena morsii—‘Shell large for the genus, subcircular, valves nearly equally and uniformly convex. Marginal line along the lateral and anterior juncture of the valves, forming a sharp, thin edge. No defined fold or sinus. Surface covered with very faint, even, concentric lines of growth; otherwise the surface - is smooth. Shell structure abundantly punctate, the punctae very minute and ar- ranged as in the related Cranaena iowensis (Calvin). .. = _ ee a i i a ad a BRACHIOPODA. 95 Brachial valve similar in degree of convexity to the opposite valve, slightly ridged from beak to near the center. Beak obtuse and but slightly incurved. Pedicle valve regularly convex, most prominent near the center sloping gently to the front and sides. Beak elevated, slightly incurved and truncated by a circular fora- men. Deltidial plates conspicuous. A slight auriculation in the posterio-lateral region gives a shouldered appearance to some individuals, but it is not a constant character. Brachial valve similar in degree of convexity to the opposite valve, slightly ridged from beak to near the center. Beak obtuse and but slighly incurved. Measurements: The average of a number of mature individtals give the following: Length, 42 millimeters; breadth, 40 millimeters; thickness, 17 millimeters.” Remarks—The material from Missouri is fragmentary, but there seem to be no well-marked differences between Greger’s Cranaena morsti and Hall and Whitfield’s Dielasma calvini. Greger’s figures show a wider hingeline and a brachial valve less tapering near the hingeline, but some of the Missouri specimens have this valve of the same shape as the Iowa species. The most characteristic feature of the species is the slight convexity of the valves. The retention of the color pattern was mentioned by Greger, and the pattern is shown in figure 5 of plate 18, Occurrence—Snyder Creek shale of Callaway County. Cranaena iowensts (Calvin) Plate 20, figures 20-22 1890. Terebratula (Cryptonella) iowensis Calvin, Bull. Lab. Nat. Hist. Univ. Iowa, I. p. 174, pl. 3, fig. 4. 1894. Cranaena Iowensis Hall and Clarke, Pal. New York, VIII, pt. II, p. 297, pl. 80, figs. 36-39; pl. 83, fig. 4. 1897. Cranaena iowensis Schuchert, U.S. G. S. Bull. 87, pl. 188. 1911. Cranaena towensis Cleland, Wisconsin Geol. Nat. Hist. Surv. Bull. 21, pl. 72, pl. 13, figs, 8-11. 1914. Cranaena iowensis Weller, Mississippian Brachiopoda, p. 249, figs. a.-j. Calvin's description—‘‘Shell large, ovate, widest at or below the middle, adult specimens very convex, greatest convexity a short distance in front of the umbo; front margin regularly rounded, truncate or slightly sinuate. Dorsal valve convex, curving gradually in all directions from a point situated at a variable distance behind the middle of the valve. Ventral valve, like the dorsal, sloping from a point behind the middle line, the curvature increasing most rapidly toward the beak; beak only moderately in- curved, perforated by a relatively small foramen; cardino-lateral slopes rounding gradu- ally, without the usual subangular ridge toward the deltidial plate; deltidial plate wide, its sides meeting beneath the foramen in an obtuse angle; muscular scars of ventral valve elongated and bounded by sharp ridges that leave three grooves extending beyond the middle of the shell in the exfoliated cast, middle groove deeper than the other two and extending in some instances almost to the front margin; sometimes the middle groove widens from the beak to about the middle of the valve, then narrows abruptly and is continued toward the front as a slender furrow. Muscular markings on the dorsal valve very variable; in general, the scars were long and separated by a narrow carina. The other details, however, are far from being constant. Dental laminae forming two short septa in the umbonal cavity of ventral valve, nearly parallel or slightly diverging where their lower margins join the shell, but curving at their upper margins so as to conform nearly in direction to the lateral margins of the deltidial plate. Surface smooth, marked only by obscure lines of growth. Shell very finely punctate. Internal loop unknown. Large specimens are an inch and a quarter in length, more than an inch in width, and three-fourths of an inch in thickness. Immature forms are very common.”’ 96 THE DEVONIAN OF MISSOURI. Remarks—Many of the Missouri specimens of Cranaena iowensis are large. The largest is 36 mm. long, 31 mm. wide, and 22 mm. thick. Sections of the interior differ from those published by Weller, but sections of some specimens from Jowa are similar to those from Missouri. The main difference between the sections is the greater strength of the curual ridges on the hingeplate of the Missouri specimens. Occurrence—Callaway limestone, Callaway County. : 7 O ae Fig. 8. Sections of Cranaena iowensis Hall. 1. Cranaena iowensis Hall. Section of a brachial valve showing the extent of the loop. : 2. Cranaena iowensis Hall. Cross-section of the pedicle valve in front of the median septum and behind the beak of the brachial valve. : 3-7. Cranaena iowensis Hall. Cross-sections of a brachial valve 33 mm. long 3 mm., 4 mm., 5.5 mm., 7 mm. and 8 mm. from the beak. Cranaena romingeri (Hall) Plate 20, figures 17-19 1863. Terebratula romingeri Hall, 16th Rep. New York State Cab. Nat. Hist., p. 48, figs. 22 and 23. 1867. Terebratula romingeri Hall, Pal. New York, IV, pt. 1, p. 389, pl. 60, figs. 17-25, 66, 67. 1889. Terebratula romingeri Nettleroth, Kentucky Fossil Shells Monograph, Kentucky Geol. Survey, pp. 155-156, pl. 16, figs. 20-22. 1894. Cranaena romingeri Hall and Clarke, Pal. New York, VIII, pt. 2, p. 297, fig. 215; pl. 80, figs. 13-19. 1897. Cranaena romingert Schuchert, U.S. G. S. Bull. 87, p. 188. 1901. Cranaena romingeri Kindle, Indiana Dept. Geol. Nat. Res., 25th Ann. Rept., pp. 660-661, pl. 12, figs. 4 and 4a. 1909. Dielasma romingeri Grabau and Shimer, North American Index Fossils, I, p. 302, figs. 376a-c. Hall's description—‘‘Shells ovate, more or less gibbous, truncate or slightly sinuate in front. Ventral valve gibbous above the middle; umbo gibbous, inflated; beak promi- nent, incurved over the opposite beak, and truncated by a round foramen which is often mainly anterior to the apex, and completed on the lower side by two deltidial plates; cardinal slopes rounded, often depressed in the middle towards the front. Dorsal valve extremely gibbous, little longer than wide; the greatest convexity at the middle or above. ee ~~ BRACHIOPODA. 97 Surface marked by fine concentric striae which are often crowded into prominent - wrinkles towards the front. Shell-structure finely punctate. The interior shows a short terebratuliform loop, which is abruptly recurved at its lower extremities.” Remarks—The Cranaena romingeri from Missouri are somewhat more ventricose than average and most of them have no indication of a sinus. The preservation is not such as to retain the loop so that it can be definitely determined. Occurrence—Mineola of Montgomery and Ralls Counties. Superfamily Spiriferacea Family Atrypidae Genus Atrypa Dalman Atrypa gregeri Rowley Plate 18, figures 7-9 1900. Aérypa gregeri Rowley, Am. Geologist, XXV, p. 264, pl. 5, figs. 9-11. 1909. Atrypa gregeri Greger, Am. Jour. Sci., XXVII, p. 376. Rowley’s description—"‘Shell ovoid, gibbous, length and breadth nearly equal. Brachial valve almost circular, convex. Pedicle valve convex, with an extended, slightly incurved, perforate beak. Neither mesial elevation nor sinus is apparent on any of the five specimens examined. Surface marked by numerous, fine radiating striae crossed by rather strong con- centric lines of growth. It may be possible that an examination of the inside of the valves of this shell will place it in some other genus, but externally it is apparently very close to Atrypa.” Remarks—Atrypa gregert has about four plications per millimeter, while small — specimens of A. reticularis (Linnaeus) have about two. The fineness of plications is about the only distinguishing character of the species. In lacking fold and sinus it agrees with many specimens of A. reticularis (Linnaeus). Occurrence—Rare in the Snyder Creek shale of Callaway County. Atrypa reticularis (Linnaeus) Plate 21, figures 6 and 7; plate 23, figures 12, 13 1767. Anomia reticularis Linne, Systema Nature, ed. XII, 1, p. 1132. 1842. Atrypa chemungensis Conrad, Jour. Acad. Nat. Sci., Philadelphia, VIII, p. 265. 1842. Atrypa chemungensis Vanuxem, Geol. New York, Rep. Third Dist., p. 182, fig. 4. 1858. Altrypa reticularis Hall, Geol. Survey Iowa, vol. I, part II, p. 515. 1867. Aérypa reticularis Hall, Pal. New York, IV, pp. 316-321, pl. 52, figs. 1-3, 7-12; pl. 53, figs. 3-19; pl. 53a, figs. 22, 23. 1894. Atrypa missouriensis Miller, Indiana Dept. Geol. Nat. ee 18th Ann. Rept., p. 315, pl. 9, figs. 19-21. 1897. Altrypa reticularis Schuchert, Bull. U. S. Geol. Surv., 87, pp. 154-155. 1901. Atrypa reticularis Kindle, Indiana Dept. Geol. Nat. Res., 25th Ann. Rept., p. 598, pl. 6, fig. 10. : 1909. Aérypa reticularis Greger, Am. Jour. Sci., XXVII, pp. 376, 377. 1909. Altrypa reticularis Grabau and Shimer, North American Index Fossils, I, p. 310, figs. 389a, b. 1911. Atrypa reticularis Cleland, Wisconsin Geol. and Nat. Hist. Surv., Bull. 21, p. 74, pl. 13, figs. 12, 13. 1913. Atrypa reticularis Prosser and Kindle, Maryland Geol. Survey, Middle and Upper Devonian, pp. 183-185, pl. 16, figs. 4-6; and Clarke and Swartz, pp. 586-587, pl. 55, figs. 6-11, 98 THE DEVONIAN OF MISSOURI. 1915. Alérypa reticularis Butts, Kentucky Geol. Survey, ser. 4, III, pt. 2, p. 115, pl. 39, figs. 1-3. Hall's description—‘‘Shell depressed, suborbicular in its young state, becoming gibbous and sinuate in its mature condition; hingeline often nearly straight and almost equaling the width of the shell; valves nearly equally convex in the young state, the dorsal valve becoming more gibbous as the shell advanced in age, and sometimes ac- quiring an undefined mesial lobe down the center. The ventral valve in the young state has the beak nearly straight and perforate at the apex, becoming incurved and finally closely bent over the beak of the opposite valve; a narrow false area is sometimes observ- able. Shell broadly and deeply sinuate in front.’ Remarks—Atrypa reticularis is the most abundant form in the Callaway and Snyder Creek, and is highly varied, ranging from a small form with fine plications which Rowley has called A. gregeri Rowley, to large forms with coarse plications. The A. gregeri Rowley have about 4 plications to the millimeter, while the large forms may measure more than one millimeter per plication. Specimens 45 mm. wide are not un- usual, though at some horizons specimens as large as 25 mm. wide are rarely found. Near the top of the Snyder Creek shale large specimens are about the only ones found and these have seven or more concentric ridges which are strongly spinose, giving to — the individuals a very rough appearance. Near the top of the Callaway one member is largely made up of medium sized A. reticularis and more than 1,000 fairly good specimens have been counted from 1/100 of a cubic yard of weathered limestone of this member. Occurrence—Abundant i in sae and Snyder Creek, common in Mineola, rare in Cooper. Atrypa spinosa Hall Plate 20, figures 8-11; plate 23, figures 8-9. 1897. Atrypa spinosa Schuchert, Bull. U. S. Geol. Surv., 87, p. 156. 1901. Atrypa spinosa Kindle, Indiana Dept. Geol. Nat. Res., 25th Annual Report, p. 599, pl. 6, fig. 11. 1909. Alérypa hystrix occidentalis Greger, Am. Jour. Sci., XXVII, p. 376. 1909. Aérypa spinosa Grabau and Shimer, North American Index Fossils, I, p. 311, fig. 392d. 1913. Atrypa spinosa Clarke and Swartz, Maryland Geol. Surv., Middle and Upper Devonian, pp. 587-589, pl. 55, figs. 12, 13. Hall's description—“Shell robust, suborbicular or ovoid; width greater or less than the length; radiatingly costate and concentrically lamellose or spinose; hingeline often nearly straight, a little less than the width of the shell. Ventral valve depressed-convex, becoming more convex in the upper part; nearly flat and often a little concave towards the lateral margins, and cardinal extremities de- pressed or broadly sinuate in front; beak abruptly rounded; apex truncate and perforate, closely appressed and overlapping the umbo of the opposite valve. Dorsal valve convex, becoming gibbous in old shells, flattened or slightly concave towards the cardinal angles, regularly curving to the sides and basolateral margins, and a little elevated in front, but without any distinct mesial fold. Surface marked by strong rounded radiating costae bifurcating at unequal intervals, which are much stronger in the middle of the valve, and become obsolete or appear as gentle undulations toward the cardinal angles. In the middle of the valves there are about seven or eight of these costae in the space of half an inch. The shell is also marked by strong concentric lamellae, which are often about a line apart. In perfect shells these lamellae, at the crossings of the costae, are often produced into tubular spines, which, when worn off, leave the ordinary lamellose surface. The spaces between these projecting lamellae are marked by fine thread-like striae. BRACHIOPODA. 99 In the separated valves, the hingeline is often nearly straight, the muscular area of the ventral valve is short and broad, the length from the apex being about equal to the width. There is a slight thickening of the shell at the base of the rostral cavity. The surface around the muscular area is papillose, and limited by a thickened border, except in front, where it is discontinued. Fine vascular markings are sometimes visible near the margin. In the dorsal valve there is a thickened septum in the upper part of the muscular area. The spires of full-grown individuals show about fifteen turns in each.” Remarks—Specimens from the Snyder Creek have usually been identified as A. hystrix var. occidentalis Hall by Missouri collectors. They differ from that species in their larger number of plications, 17 to 25 as compared to 8 to 14, in the plications remaining distinct to the margin, and in the brachial valve being less gibbous. No specimens with spines are in the collections examined. On plate 23, figure 7, the Airypa is inserted for comparison with typical A. spinosa from the Snyder Creek shale. Occurrence—Rare in the Snyder Creek shale of Montgomery County. Family Spiriferidae Genus Spirifer Sowerby Spirifer annae Swallow Plate 19, figures 13, 15-17; plate 24, figure 17 1860. Spirifer annae Swallow, Trans. St. Louis Acad. Sci., I, p. 641. 1860. Spirifer amarus Swallow, Trans. St. Louis Acad. Sci., I, p. 642. 1897. Spirifer annae Schuchert, Bull. U. S. Geol. Surv., 87, p. 381. 1897. Spirifer amarus Schuchert, Bull. U. S. Geol. Surv., 87, p. 381. 1909. Spirifer amarus Greger, Am. Jour. Sci., XXVII, p. 377. Swallow's description—‘Shell very small, sub-semipyramidal. Ventral valve semi-pyramidal; slightly arched from the beak to the anterior and lateral margins; area high, arched, triangular; sides shorter than the base on the cardinal line; beak small, pointed, and slightly incurved; mesial sinus simple, well defined, concave, or flattened at the bottom, foramen narrow. Dorsal valve semicircular, slightly convex, flattened towards the cardinal extremities; mesial fold sharply defined, depressed, simple beak small, slightly incurved over the cardinal line; cardinal line as long or shorter than the width of the shell. Surface marked with from six to ten plications on each side of the mesial sinus and fold, and by numerous concentric imbricating lamellae. Length, .25; breadth, .33; thickness, .20.”’ Revised description—Shell very small for the genus, angular, semiconical, wider than long, the greatest width usually along the hingeline. Resembles Cyrtina in shape and dimensions. Usual dimensions: Length 5 to 6 mm., breadth 6 to 7 mm., thickness 3to4mm. The largest specimen observed measured: Length 11 mm., width 15 mm., height, 9 mm. Shells 2/3 as large as the largest given are not uncommon. Pedicle valve very convex and Cyrtina-like in shape; beak small, pointed, slightly to strongly incurved; cardinal area very high, slightly to quite strongly arched, lateral margins sharply defined; lateral slopes each marked by 5 to 8 simple rounded plica- tions; mesial sinus shallow, rounded at the bottom, originating at the beak and in- creasing gradually in width to the front margin. Brachial valve slightly convex, with the greatest convexity near the back; mesial fold low, not rising above the rest of the shell, separated from the lateral plications by a slightly deeper furrow than those between the other plications, an incipient groove near the front on the larger specimen; plications similar in number and shape to those on the other valve. The surface is marked by numerous imbricating lines of growth. Very fine radiating striae are the most striking peculiarity of the shell surface. 100 THE DEVONIAN OF MISSOURI. Remarks—Swallow’s S. annae and S. amarus are, without question, the same. Specimens are abundant in some places and the differences displayed are in size, number of plications, and height of cardinal area. All have the radiating striae and the varia- tions in other respects are not striking. The resemblance in shape to Cyrtina triquetra Hall which occur with Spirifer annae is so close that in most cases one must look for the striae to distinguish them. Occurrence—Snyder Creek shale of Montgomery and Callaway. Counties. Spirtfer asper Hall Plate 19, figures 19-23; plate 23, figure 4. 1858. Spirifer aspera Hall, Geol. Survey Iowa, I, pt. 2, pp. 508-509, pl. 4, fig. 7. 1882. Spirifer (Cyrtena) aspera Whitfield, Geol. Wisconsin, IV,:p. 331-332, pl. 26, TCO ae eae 1894. Spirifer usper Hall and Clarke, Pal. New York, VIII, pt. 2, pp. 29, 31, 32, 39, pl. 25, figs. 20-25. 1897. Spirifer asper Schuchert, Bull. U. S. Geol. Survey, 87, p. 382. 1909. Spirifer asper Grabau and Shimer, North American Index Fossils, I, p. 331. 1909. Spirifer asper Greger, Am. Jour. Sci., XXVII, p. 377. 1911. Spirifer asper Cleland, Wis. Geol. and Nat. Hist. Surv., Bull. 21, pp. 76-77, pl. 16, figs. 1-5. Hall's description—"‘Shell semielliptical, width about twice the length; hingeline equaling the greatest width of the shell, and abruptly angular at the extremities. Ventral valve triangular pyramidal, extremely elevated at the umbo, and sloping abruptly to the lateral and anterior margins; mesial sinus shallow, strongly defined at its margins, equal or less in height than the length of the valve, transversely and vertically striate; foramen proportionally narrow, extending to the beak, and partially closed within by a pseudo-deltidium; beak not incurved. Dorsal valve nearly flat or moderately convex; mesial fold strongly defined at the margins, and rounded above. Surface, in full-grown specimens, marked by twenty or more simple rounded and moderately elevated plications on each side of the mesial fold and sinus. Plications often fifteen to eighteen in ordinary specimens, four or five only of which reach the beak, the others running out along the hingeline and margins of the area; concentrically marked by fine imbricating lines of growth, which are sometimes very conspicuous. Entire surface granulose; granules closely arranged, sometimes visibly following the concentric striae, and in other parts apparently scattered without order.”’ Remarks—Specimens from Missouri are not as large as average specimens from Iowa and the number of plications on either side of the fold and sinus is usually 15 or 16 rather than more than 20. ; Occurrence—Rare in Snyder Creek shale and Callaway limestone of Callaway County. Spirtfer euryteines Owen Plate 22, figures 1-12; plate 23, figures 2 and 3 1844, Delthyris euruteines Owen, Rep. Geol. Expl. Iowa, Wis. and IIl., p. 69, pl. 12, aioe oe 1852. Spirifer euruteines Owen, Geol. Survey, Wisconsin, Iowa and Minnesota, p. 586, pl. 3, figs. 2-6. 1858. Spirifer parryanus Hall, Geol. Survey Iowa, I, pt. 2, p. 509, pl. 4, fig. 8. 1858. Spirifer capax Hall, Geol. Survey Iowa, I, pt. 2, pp. 520-521, pl. 7, fig. 7. 1861. Spirifera Parryana Billings, Canadian Jour., VI, p. 261, figs. 77, 78. 1863. Spirifera Parryana Billings, Geol. Canada, p. 386, fig. 422. 1868. Spirifer fornacula Meek and Worthen (non Hall), Geol. Survey Illinois, III, p. 433, pl. 13, fig. 8. BRACHIOPODA. 101 1883, Spirifer parryana Hall, Second Ann. Rep. N. Y. State Geol., pl. 52, figs. 8, 9. 1883. Spirifera capax Hall, Second Ann. Rep. N. Y. State Geol., pl. 52, figs. 15-17. 1884. Spirifera Parryana Walcott, Mon. U.S. Geol. Surv. VIII, p. 137, pl. 14, fig. 10. 1888. Spirifera parryana Calvin, Bull. Lab. State Univ. Iowa, p. 19. 1894. Spirifer Parryanus Hall and Clarke, Pal. New York, VIII, pt. 2, pp. 29, 31, 39, pl. 22, figs. 8, 9, 15-17. 1894. Spirifera parryana Keyes, Geol. Surv. Missouri, V, p. 77, pl. 40, fig. 4. 1897. Spirifer euryteines Schuchert, Bull. U. S. Geol. Surv., 87, p. 389. 1909. Spirifer euryteines Greger, Am. Jour. Sci., XXVII, p. 377. 1909. Spirifer eursteines Grabau and Shimer, North American Index Fossils, I, pp. 326-327. 1911. Spirifer euryteines var. milwaukeensis Cleland, Wisconsin Geol. and Nat. Hist. Surv.; Bull. 21, pp. 77-78, pl. XV, figs. 1-6. Owen's description—‘‘Shell nearly semi-elliptical; cardinal area very wide, slightly concave and finely striated; narrow perforation; beaks sometimes more than half an inch apart, smooth, with eighteen to twenty ribs on either side of the bourrelet, finely striated longitudinally, sometimes studded with small granulae, bourrelet rather narrow with a shallow sinus in the median line, finely striated, and crossed by fine concentric lines of growth, and sometimes by fine granulae. Sinus of the dorsal valve also some- times finely granulated. Length, one inch, breadth one and a half inches.” Revised description—Shell large, nearly twice as wide as long, greatest width along the hingeline; dimension of an average sized pedicle valve, length 25 mm., width 40 mm., convexity 14 mm. Dimensions of average brachial valve, length 21 mm., breadth 40 mm., convexity 10 mm. Thirty-one specimens of 220 measured were more than 50 mm. along the hingeline. The largest specimen in a collection of more than 300 is 70 mm. along the hingeline, the longest pedicle valve is 43 mm., the longest brachial valve is 35 mm. Pedicle valve with greatest convexity near the middle; beak acute, projecting slightly beyond the*hingeline; cardinal area high and wide, average height about 8 mm., greatest height observed 35 mm. Each lateral slope marked by about 15 to 25 rounded plications. Mesial sinus shallow, broad near the front. Brachial valve about half as convex as the pedicle; greatest convexity near the front. Fold low, well defined, broad near the front. The most characteristic structure of this Spirifer is fine radial lines which covér plications, fold, sinus, and cardinal area. On perfectly preserved specimens minute granules appear along the lines. Occurrence—Abundant near the top of the Snyder Creek shale in Callaway and Montgomery Counties, rare in the Callaway limestone of Montgomery, Callaway and Boone Counties, rare in the Mineola of Ralls and Warren Counties. Spirifer subvaricosus Hall and Whitfield Plate 20, figures 6 and 7; plate 24, figur: 13 1873. Spirifera subvaricosa Hall and Whitfield, 23rd Ann. Rept. New York State Cabinet of Nat. Hist., p. 237, pl. 11, figs. 12-15. 1897. Spirifer subvaricosus Schuchert, U. S. G. S. Bull. 87, p. 406. 1911. Spirifer subvaricosus Cleland, Bull. 21, Wis. Geol. Nat. Hist., pp. 81-82, pl. 16 figs. 6-11. Hall and Whitfield’s description—‘‘Shell small, seldom more than five-eighths of an inch on the hingeline. Valves highly convex, the ventral somewhat gibbous, with an incurved cardinal area of moderate height, divided by a triangular foramen which is higher than wide; cardinal angles slightly rounded, plications subangular, eight to ten on each side of the ventral valve, with one moderately strong in the bottom of the sinus not always extending to the apex; on the dorsal valve this mesial fold consists of two strong equal plications with a deep angular groove between. Surface marked by 102 THE DEVONIAN OF MISSOURI. somewhat strong, rugose, zigzag lines of growth, which are sharply bent backwards as they cross the plications.” Remarks—This species occurs in the Mineola of Ralls County associated with S. varicosus Hall. None of the specimens is perfect. The distinguishing features are: Plications more angular on subvaricosus than on S. varicosus Hall, cardinal area higher and narrower, entire shell narrower, a well defined angular plication in the bottom of the sinus. A larger series might show all gradations between the forms. Occurrence—Mineola of Ralls County. “Spirifer varicosus Hall Plate 19, figure 18; plate 21, figures 4 and 5; plate 24, figures 14 and 15. 1857. Spirifer varicosa Hall, Tenth Rep. N. Y. State Cab. Nat. Hist., p. 130. 1861. . Spirifera varicosa Billings, Canadian Jour., VI, p. 255, figs. 63, 64. 1863. Spirifera varicosa Billings, Geol. Canada, p. 960, fig. 467. 1867. Spirifera varicosa Hall, Pal. New York, IV, pt. 1, pp. 205-206, pl. 31, figs. 1-4. 1883. Spirifera varicosa Hall, Second Rep. N. Y. State Geol., pl. 59, figs. 4-8. 1884. Spirifera varicosa Walcott, Mon. U. S. Geol. Survey, VIII, p. 136. 1889. Spirifera varicosa Nettleroth, Kentucky Fossil Shells, Monograph Kentucky Geol. Survey, p. 134, pl. 10, figs. 11-20, 23-25. 1894. Spirifer varicosus Hall and Clarke, Pal. New York, VIII, pt. 2, pp. 17, 36, pl. 34, figs. 4-8. 1897. Spirifer varicosus Schuchert, U. S. Geol. Survey, 87, p. 408. 1901. Spirifer varicosus Kindle, Ind. Dept. Geol. and Nat. Res., 25th Ann. Rept., p. 644, pl. 9, fig. 3. 1909. Spirifer varicosus Grabau and.Shimer, North American aes Fossils, I, p. 325, figs. 413, a-c. . 1912. Spirifer varicosus Kindle, U. S. Geol. Surv., Bull. 508, p. 82, pl. 6, fig. 16. Hall's description—‘‘Shell somewhat semi-circular or semi-elliptical; length equaling or less than half the width; hingeline equal to the greatest width of the shell, and-ter- minating in salient angles or mucronate extensions. Surface plicated. Ventral valve much the more convex; greatest elevation at the umbo, and regularly curving to the front and lateral margins; mesial sinus strongly defined, rather flat in the bottom; beak slightly arcuate. Area high, nearly flat below and slightly concave towards the apex. Dorsal valve moderately convex, with a prominent abruptly elevated mesial fold, which is flattened on the summit and sometimes slightly depressed along the centre; the beak projecting a little above the hingeline, and with a narrow area gently incurved. The surface is marked by from eight to ten simple-and somewhat abruptly elevated plications on each side of the mesial fold and sinus; these are crossed by strong lamellose imbricating lines of growth, which givea varicose character to the surface, and where the shell is exfoliated the plications are nodose. In some specimens, distinct fine radiating striae can be observed. There is often a retral curving of the concentric striae in the centre of the mesial sinus, and sometimes a slight elevation along that line.” Remarks—This is one of the common species in the Mineola fauna though few. good specimens have been collected. All of the specimens are small, the largest measur- ing 24 mm. along the hingeline. The average width is 13 to 15 mm. along the hingeline. The number of plications on either side of the fold and sinus ranges from 8 to 11, most specimens having 8, 9 or 10. The median fold in some cases has a well defined groove that forms two plications, while in some specimens the groove is scarcely distinguishable. ‘Only one specimen is well enough preserved to retain the concentric lines that gave the species its name. The beak of the pedicle valve projects slightly farther back of the hingeline than in ordinary S. varicosus. Occurrence—Mineola of Montgomery and Warren Counties. BRACHIOPODA. 103 Genus Syringothyris Winchell Syringothyris occidentalis (Swallow) Plate 20, figures 3-5; plate 21, figures 1-3; plate 23, figure 1 1860. Cyrtia occidentalis Swallow, Trans. St. Louis Acad. Sci., I, pp. 648-649. 1889. Cyrtina occidentalis Miller, North American Geology and Pal., p. 343. 1894. Syringothyris occidentalis Keyes, Missouri Geol. Surv., V, p. 86. 1897. Cyrtina ? occidentalis Schuchert, U.S. G. S. Bull. 87, p. 199. 1909. Cyrtia occidentalis Greger, Am. Jour. Sci., X XVII, p. 378. 1910. Syringothyris occidentalis Schuchert, Am. Jour. Sci., XXX, pp. 223-224. 1918. Syringothyris occidentalis Branson, Geology of Missouri, pp. 100-101, fig. 7. 1920. Syringothyris occidentalis Greger, Am. Jour. Sci., L, p. 23. Swallow's description—‘‘Shell of medium size, semi-conical. Ventral valve high, semi-conical, slightly curved from the beak to the anterior and lateral margins; sinus well defined, very wide and flattened in front; area slightly concave, high and tri- ~ angular—base but little longer than the slightly curved sides; foramen extending from the beak to the cardinal line, much wider at the base, and not closed in the specimens observed; beak pointed and slightly incurved; dorsal valve convex, somewhat quad- rangular, much broader than long; lateral edges rounded towards the cardinal extremi- ties; mesial fold broad and convex in front; cardinal line shorter than the greatest width of the shell. Surface marked with some fifteen or twenty rounded plications on each side of the mesial fold and sinus, and numerous concentric lamellose lines, which often become very conspicuous towards the margins; shell punctate.” Revised descriptton—Shell wider than long, the greatest width along the hingeline or a little in front of it, height about the same as the length. An average specimen measures 30 mm. wide, 23 mm. long and 24 mm. high, cardinal area 17 mm. high, greatest width of cardinal area 20 mm., width of delthyrium at hingeline 8 mm. Pedicle valve high, sinus wide and shallow; cardinal area gently arched, margin angular to subangular, meeting the sides in almost a right angle; each iateral slope of the valve marked by about 16 rather faint plications. The dental lamellae extend about 1/3 the length of the valve. They diverge considerably in passing outward along the sinus and their outer ends are against the third plication from the sinus margin. The delthyrial plate extends about half way down the delthyrium and the syrinx extends only a short distance below. No syrinx is developed excepting at the lowest part of the plate, as shown in figures 12 and 14. The upper part is much like a long delthyrial plate in a Spirifer. Spirifer euryteines Owen, in some cases, has a plate comparable to the upper part of this. The syrinx part is not in contact with the edge of the delthyrium and it seems to be solid. Muscular scars well developed, subovate in outline. The adductor scars narrow and elongate and not sharply distinguished from the diductor. Brachial valve moderately convex; fold originating at the beak and widening rapidly toward the margin; cardinal area narrow, practically at right angles to the area of the pedicle valve; beak extending sharply beyond the cardinal margin; plications similar to those on the pedicle valve. The muscle scars are of medium size. They extend about 3 times the width of the fold near the hingeline but are confined to the fold at their anterior ends. The scars are not deeply impressed. Remarks—This is the oldest species of the genus that has been described, but S. n. sp. of this volume is from an older formation. During Middle and Upper Devonian the Spirifers evolved toward high areaed forms and the syrinx was one of the results. Occurrence—Generally rare in the Callaway but abundant in some places in Boone and Callaway Counties. 104 THE DEVONIAN OF MISSOURI. Syringothyris n. sp. Plate 20, figures 1 and 2 One specimen of Syringothyris has been collected from the Mineola. It is an internal mould and imperfectly preserved. The following notes on the specimen are from a letter of Prof. J. E. Hyde: . ‘Specimen is an interior mould of a new species of Syringothyris, properly a Pseudo- syrinx if that genus proves of permanent value. It is a pedicle valve with high, flat cardinal area standing at between 80 degrees and 87 degrees to the plane of the valve. “Ly BY, .64, Length of pedicle valve, 22.7 mm., brachial valve about 14.5 mm. Ratio L2 Pee Height of cardinal area 17.3 mm., breadth of cardinal area, 23 mm. Greatest breadth of pedicle valve 28 to 29 mm. Width of delthyrial opening at hinge about 8 mm. From this it would be seen that the hinge line is narrower than the greatest width of the valve. Greatest width of valve about half way between cardinal area and anterior margin. Width of sinus at anterior margin 13 mm., or nearly half the greatest width of the valve. Sinus broadly concave, its margins rather abruptly bent into the strongly convex sides of the valve which are rounded to meet the cardinal area at an obtuse angle. Dental lamellae, where attached to the cardinal area but moderately divergent to form a high, narrow delthyrial opening, the whole essentially flat, and parallel to the plane of the cardinal area or but slightly pointing into the valve, but slightly sunken below the . plane of area. The free end isa flat, or very slightly concave, triangular point, one-third the total length of plate, with no upturned edges, exactly the stage of the syrnix made by Weller characteristic of his genus Pseudosyrinx. As in many other species examined, the triangular tip shows what appears to be a clearly defined muscle scar. This Pseudo- syrinx or flat-plate stage is commonly found in the older species of Syringothyris, is clearly primitive, and this mid-Devonian species runs true to form in its possession. Some years ago I examined a suite of authentic Syringothyria occidentalis Swallow from the Callaway limestone of Missouri. This Devonian form, as I now recall it, is wholly distinct from the one you present. That species is possessed of a high, flat area bending by sharp angles into the flattened sides of the valve, and these in turn rather abruptly into the shallow, broad sinus; there is very little curvature along any line from the beak to the free margin, and the result is a high, pointed, rigid, sub- pyramidal aspect that is characteristic. Syringothyris chemungensis Cushing, from the Ohio Chagrin, which is Upper Devonian, has its greatest width at the hinge and acute or 90-degree cardinal angles, transverse plate much larger, occupying half the length of the delthyrial opening or more, syrinx on whole a little more advanced in type, with recurved edges suggesting begin- ning of a tube, though occasional individuals show same stage as yours. . Your specimen with its delicate transverse plate, sunken but slightly below the cardinal area, has almost nothing in common with those early Syringothyri from Warren, Pa., described by Simpson as S. vandalli and angulata, with their narrow arched areas and thick, massive, spine-like, highly-inclined, transverse plate, sunken far below the plane of the area.” Remarks—Schuchert’s! earlier supposition that Syringothyris originated in the At- lantic province rather than the Cordilleran is supported by the presence of this speci- men in the Mineola. However, the two provinces were not as distinct as was supposed. 1Am. Jour. Sci. XXX, p. 223. EE BRACHIOPODA. 105 Fig.9. Sections of Spirifers. 1-4. Spirifer asper (Hall). Sections 3 mm., 4 mm., 4% mm., and 5.3 mm. from the beak. 5-7. Spirifer euryteines Hall. Sections 14% mm., 4 mm., and 7.3mm. from the beak. 10. Syringothyris hannibalensis (Swallow). Section 9 mm. from the beak. 11-14. Syringothyris occidentalis (Swallow). Sections 3 mm., 4 mm., 5 mm. and 1842. 1897. 1901. 1903. 1909, git. 1912. 1913. 6 mm. from the beak. Spirifer annae Swallow. Section 1 mm. from the beak. Spirifer subvaricosus Hall and Whitfield. Section 2 mm. from the beak. Genus Reticularia McCoy Reticularia fimbriata (Conrad) Plate 16, figures 1 and 2. Delthyris fimbriatus Conrad, Jour. Acad. Nat. Sci., Phila., VIII, p. 263. Reticularia fimbriata Schuchert, Bull. U. S. Geol. Surv., 87, p. 342. Reticularia fimbriata Kindle, Ind. Dept. Geol. Nat. Res., 25th ane Rept., 651-652, pl. 7, fig. 11. Spirifer fimbriaius Clarke, N. Y. State Mus., Bull. 65, p. 316. Relicularia fimbriata Grabau and Shimer, North American Index Fossils, I, p. 338, figs. 431a, b. Reticularia fimbriata Cleland, Wisconsin Geol. and Nat. Hist. Surv., Bull. 21, p. 82, pl. 17, figs. 1-2. Reticularia (cf.) fimbriata Kindle, Bull. U. S. Geol. Surv., 508, p. 82. Spirifer (Relicularia) fimbriatus Prosser and Kindle, Maryland Geol. Surv., Middle and Upper Devonian, pp. 197-198, pl. 19, figs. 10-12. Hall's description—‘‘Shell transversely subelliptical, gibbous; hinge line less than the width of the shell; cardinal extremities rounded. 106 THE DEVONIAN OF MISSOURI. Ventral valve gibbous in the upper half, regularly curving to the front and sides; sinus well defined, usually shallow and rounded, sometimes deep and angular, and much produced in front; beak small and incurved over the area, which is high and coneave and extending about half the entire width of the shell; foramen often limited by a sharp ele- vated border, which appears to be a projection of the dental plates. Dorsal valve gibbous, regularly convex on the sides, a little flattened at the airtel extremities; mesial fold abruptly elevated in the lower part, often but little elevated or scarcely defined in the upper part; beak small, slightly arched over the sublinear area, which is somewhat concave. Surface marked by from three or four to eight or nine low, rounded, often setae : plications on each side; these are crossed by imbricating lamellose striae, which are sometimes wide or distant, and often crowded. The concentric striae are studded with elongated nodes or tubercles, which are thus arranged in parallel bands, more or less contiguous, according to the distance of the concentric striae. The elongate tubercles may perhaps more properly be regarded as interrupted radiating striae, which, in the perfect condition of the shell, have doubtless extended in slender. spines or setae. (They are termed Be Mr. Conrad short pss oar striae. ) The area is strongly striated vertically.” Remarks—This is a rare species in the Mineola eee of Missouri and most of the specimens are imperfectly preserved. On one specimen the fine undulating lamellose striae are well preserved and two specimens show the radiating lines which represent the elongated nodes or tubercles. Occurrence—Mineola of Montgomery and Warren Counties. Genus Martinia McCoy Martinia halli n. sp. Plate 16, figures 6-8 Description—Shell small, subcircular in outline, cardinal extremities rounded. The dimensions of two nearly perfect specimens are: Length of pedicle valve 7.7 mm., 6 mm.; width 8 mm., 6.7 mm.; thickness 6 mm., 4 mm.; length of brachial valve, 7 mm., 5.4 mm. Pedicle valve strongly and uniformly convex, the greatest convexity a little in front of the hinge line; umbo prominent and projecting beyond the hinge line; curve to the beak a little stronger than that toward the front of the shell; a faint indication of a mesial sinus on the anterior half of the shell. Cardinal area small, strongly arched, the lateral margins rounded; delthyrium small. ; Brachial valve about two-thirds as convex as the pedicle, the greatest convexity near the hinge line, the surface sloping almost uniformly in all directions. No indi- cation of a mesial fold. Beak small, cardinal area very narrow. Both valves seem to be smooth. The description is based on six specimens, three of which are excellently preserved and show no markings. . Occurrence—Callaway limestone of Moniteau County. The species is named for Mr. Roy H. Hall, who mapped the Devonian of Moniteau County and collected the first specimens of the species. Family Suessiidae Genus Cyrtina Davidson Cyrtina hamiltonensis (Hall) Plate 19, figures 5-8 1857. Cyrtia hamillonensis Hall, Tenth Rep. N. Y. State Cab. Nat. Hist., p. 166. 1861. Cyrtia Hamiltonensis Billings, Canadian Jour., VI, p. 262, figs. 80-82. 1863. Cyrtina Hamiltonensis Billings, Geol. Canada, p. 384, fig. 415. : | BRACHIOPODA. 107 1867. Cyrtina hamiltonensis Hall, Pal. N. Y., IV, pt. 1, p. 268, pl. 27, figs. 1-4; pl. 44, ~ figs. 26-33; 38-52. 1868. Cyrtina hamiltonensis Meek, Trans. Chicago Acad. Sci., I, pt. 1, pp. 99-100, pl. 14, figs. 5, 7?, 10. 1889, Cyrtina hamiltoniae Nettleroth, Kentucky Fossil Shells, Mon. Kentucky Geol. Survey, p. 96, pl. 13, figs. 4-12. 1889. Cyrtina hamiltonensis Miller, North American Geol. Pal., p. 343, fig. 558. 1891, Cyrtina hamiltonensis Keyes, Johns Hopkins Univ. Circ., XI, p. 29. 1891, 1892. Cyrtina Hamiltonensis Whiteaves, Cont. to Canadian Pal., I, pt. 3, pp. 226-227, pt. 4, p. 288. 1894. Cyrtina Hamiltonensis Hall and Clarke, Pal. N. Y. VIII, pt. 2, p. 46, pl. 28, ' figs. 23-33, 43, 45, 46, 53. 1896. Cyrtina hamiltonensis Kindle, Bull. American Pal., 6, p. 35. 1897. Cyrtina hamiltonensis Schuchert, Bull. U. S. Geol. Surv. 87, p. 198. 1903. Cyrtina hamiltonensis Clarke, N. Y. State Mus., Bull. 65, p. 224. 1909. Cyrtina hamiltonensis Grabau and Shimer, North American Index Fossils, I, p. 313, figs. 393 a-c, 1911. Cyrtina hamiltonensis Cleland, Wisconsin Geol. Nat. Hist. Surv., Bull. 21, p. 75, pl. 15, figs. 7-10. 1912. Cyrtina hamiltonensis Kindle, Bull. U. S. Geol. Surv., 508, p. 81, pl. 5, fig. 4. 1913. Cyrtina hamiltonensis Prosser and Kindle, Maryland Geol. Survey, Middle and Upper Devonian, pp. 185-187, pl. 17, figs. 1-9; Clarke and Swartz, pp. 591-592, pl. 56, figs. 1-3. Hall's description—‘‘Shell more or less triangular-subpyramidal; hinge line equal to the greatest width of the shell; proportions of length, breadth and height variable, but frequently the width is equal to the length of the ventral valve, and the height of area is equal to the length of the dorsal valve; surface plicate. Ventral valve quadrilateral in outline, obliquely subpyramidal, most prominent at the break, which is very variable in elevation and straight or a little arched over the area, and not infrequently attenuate and distorted or turned to one side; mesial sinus wide and strongly defined, rounded or subangular in the bottom; area variable, large and elevated, plane or arcuate in different degrees with the lateral margins angular, distinctly striate in both directions; fissure narrow, closed by a convex pseudo-deltidium, which is perforated above by an oval or narrowly ovate foramen. Dorsal valve depressed-convex, with a broad more or less prominent mesial fold, which is bounded by broader furrows than those between the plications, and is sometimes extremely elevated in front; beak scarcely rising above the hinge line; area narrow linear, but quite distinct. Surface marked by about six to eight (rarely one or two more) simple rounded plications on either side of the mesial fold and sinus, and these are crossed by very fine concentric lines of growth, which at intervals become crowded and subimbricate, es- pecially towards the margins of older shells. The finer surface-marking is minutely granulose or papillose, and the shell-structure distinctly punctate. In some of the larger individuals there is an obscure elevation on each slope of the sinus, resembling an obso- lete plication. The longitudinal median septum extends for more than half the length of the ventral valve, and is continued into the cavity beneath the pseudo-deltidium. These features are shown in the casts and in transverse sections of the valve. The dorsal valve shows a double or bilobed cardinal process, with the strong crural bases supporting spiral arms, which are directed into the two compartments of the ventral valve, and, making numer ous turns, terminate in the rostral part of the shell.”’ Remarks—The species is common in the: Mineola and, though good specimens are rare, a few beautifully preserved ones have been collected. Most of the specimens are 108 THE DEVONIAN OF MISSOURI. smaller than average C. hamiltonensis but some are large. Many of the small speci- mens have only 5 plications on each side of the fold and sinus. Occurrence—Mineola of Callaway, Montgomery and Warren Counties. Cyrtina missouriensis (Swallow) Plate 16, figure 9; plate 19, figures 1-4 1860. Cyrtia Missouriensis Swallow, Trans. St. Louis Acad. Sci., I, pp. 647-648. 1889. Cyrtina missouriensis Miller, North American Geol. Pal., p. 343. 1894. Cyrtina umbonata Keyes, Missouri Geol. Surv., V, p. 90. 1897. Cyrtina missouriensis Schuchert, Bull. U. S. Geol. Surv. 87, p. 198.: 1909. Cyrtina missouriensis Greger, American Jour. Sci., XXVII, p. 378. Swallow's description—‘‘Shell small, angular, beak and cardinal extremities salient. Ventral valve very prominent, regularly arched from the beak to the front and anterior portions of the lateral margins; beak pointed and incurved; sinus well defined, becoming deep and broad in front where it projects into the fold of the dorsal valve; area somewhat regularly concave, triangular; the hinge line but little longer than the sides, and about equal to the greatest width of the shell; foramen rather large, widening regularly from the beak to the hinge-line, closed by a convex pseudo-deltidium, which is perforated above the middle. Dorsal valve semi-elliptical, convex, flattened towards the cardinal extremities, which are somewhat produced; mesial fold convex, well defined and bounded by grooves larger and deeper than those separating the plication; beak incurved against the lower extremity of the deltidium. Surface marked with rounded plications, seven to nine on each side of the mesial fold, and eight to ten on each side of the mesial sinus. There is also one plication, somewhat smaller than the others, on each slope of the mesial fold and sinus. The plications bounding the mesial sinus are larger than the others; the internal casts of the shell show all the plications less distinctly. The shell is also marked with fine imbricating concentric lamellae and numerous small punctures. This species is more nearly allied to the Cyrtia umbonata of Prof. Hall than to any other. It differs, however, from that in having plications on the mesial fold and in the sinus of the ventral valve; the plications are more numerous and extend to the beak; the foramen is wider at the base.” Supplementary descripiion—Shell usually small but some as large as large specimens of C. hamiltonensis Hall. Pedicle valve regularly arched or straight from the beak to the front. Beak pointed and straight or incurved. Area plane or concave. Delthyrium of about the same proportions as in C. hamiltonensis Hall, wider near the hinge line in| some specimens. Brachial valve moderately convex to almost flat; mesial fold usually well-defined but in some specimens indistinct. Surface marked by 7 to 11 rounded plications on each side of the fold and sinus. The plications bounding the fold and sinus are usually slightly larger than those on the sides of the shell. Remarks—Swallow’s description seems to have been based on a selected group of specimens that omitted the variations. The supplementary description is based on speci- mens from the type region. The species differs from C. hamiltonensis Hall in the presence of plications on the fold and sinus; in the fold and sinus being less distinct; and in the plications being more numerous and uniform. Occurrence—Abundant in the Callaway of Callaway, Montgomery and Warren Counties. Cyrtina triquetra (Hall) Plate 19, figures 9-12 1858. Cyrtia triquetra Hall, Geol. Survey Iowa, I, pt. 2, pp. 513-514. 1868. Cyrtina triquetra Meek, Trans. Chicago Acad. Sci., I, p. 99. 1868. Cyrtina triquetra Meek and Worthen, Geol. Survey Illinois, III, p. 436, pl. 13, fig. 4. | : : 5 ‘ ‘ ; . > oe BRACHIOPODA. - 109 1894. Cyrtina triquetra Hall and Clarke, Pal. New York, VIII, pt. 2, pl. 28, figs. 34, 35. 1897. Cyrtina triquetra Schuchert, Bull. U. S. Geol. Surv., 87, p. 199. 1909. Cyrtina triquetra Greger, Am. Jour. Sci., XXVII, p. 376. Hall's description—‘‘Shell small, pyramidal; cardinal extremities somewhat salient. Ventral valve extremely elevated, the beak slightly incurved; sinus deep, angular or subangular, bounded on either side by strong plications; area large, forming a nearly equilateral triangle, the base being scarcely longer than the sloping sides; foramen narrow, slightly open at base, and closed for half its length by a pseudo-deltidium. Dorsal valve depressed convex, semi-circular or semi-oval, with a strongly elevated mesial fold which is bounded by a deeper groove than those separating the plications. Surface marked by seven or eight plications on either side of the mesial fold, and by nine on either side of the mesial sinus, and these are crossed by fine imbricating lamellose striae; the entire surface granulose or punctate.” Remarks—Specimens identified as Cyrtina triquetra are rare in the Snyder Creek shale. The area is somewhat higher than in the type of C. triquetra, the number of plications is 6 to 8, and occasion: ll; 9 on either side of the fold and sinus, the outer ones usually poorly defined. On the type of C. triquetra the outer plications on the brachial valve are poorly defined. In most of the Snyder Creek specimens the pseudo-deltidium extends about half the height of the delthyrium, but in the one shown in figure 12, it nearly closes it. Family Athyridae Genus Athyris McCoy Athyris fultonensis (Swallow) Plate 17, figures 1-4. 1860. Spirigera Fultonensis Swallow, Trans. St. Louis Acad. Sci., I, p. 650. 1860. Spirigera minima Swallow, Ibid. p. 649. 1894, Athyris vittata Keyes, Geol. Survey Missouri, V, pt. 2, p. 90, pl. 41, fig. 1. 1897. Athyris fultonensis Schuchert, Bull. U. S. Geol. Surv., 87, p. 147. : 1909. Athyris fultonensis and Athyris minima Greger, Am. Jour. Sci., XXVII, pp. 376-377. Swallow's description—‘‘Shell small, lenticular, flattened towards the anterior and lateral margins, forming there a thin sharp edge at the junction of the valves. Ventral valve suborbicular, moderately convex, highest near the beak; mesial sinus obsolete or entirely wanting; beak short, incurved; perforation small, orbicular. Dorsal valve smaller, orbicular, most convex near the beak; beak small, incurved, breaking the periphery of the perforation of the opposite beak. . Surface regularly marked with numerous, concentric, lamellose, granular plications and fine concentric striae; the striae are observed on well preserved specimens only. Length, .50; breadth, .53; thickness, .28. This fossil is most like Sp. hirsuta of Prof. Hall; but it may be distinguished by its greater thickness near the beaks, and by the sharp thin edge found at the junction of the valves. Abundant in some beds of the Hamilton rocks of Callaway County.” Remarks—Most paleontologists use Athyris vittata Hall as a synonym for A. fultonensis (Swallow) and the writer followed that precedent until he had collected hundreds of specimens of both species. Swallow described two species of Athyris from Callaway County, Missouri. A. fultonensis and A. minima. Both are listed from the Hamilton rocks of Callaway County. As the types were burned it is impossible to compare with them, but there can be no question about the species. The writer has examined more than 500 good specimens of Athyris from Callaway County. The small specimens grade into the large with no perceptible differences save in size, and A. minima becomes a synonym of A. fultonensis. 110 THE DEVONIAN OF MISSOURI. A. fultonensis (Swallow) shows decided and constant differences from A. vittata Hall. An average specimen of A. vittata Hall from the Cedar Valley of Iowa gives the following measurements: Length, 11 mm.; breadth, 12 mm.; thickness, 7.5 mm. An average A. fultonensis (Swallow) from Callaway County gives: Length, 7.5 mm.; breadth, 6.5 mm.; thickness, 4.5 mm. . The ratio of length to breadth of the Iowa form is 11:12, of the Missouri form 15-13. The greater width compared to length is constant with the Iowa form while the reverse is true of the Missouri form. The largest specimen examined by the writer is 9 mm. wide by 8.8 mm. long, and measurements have been made of only two specimens that are wider than long. Swallow must have selected unusually large specimens for his description. Some of the largest specimens have fairly well defined fold and sinus which are much narrower than in fowa specimens of A. vittata Hall. The beak of the pedicle valve is much narrower and projects farther behind the hinge line than in A. vittata Hall. Callaway limestone specimens of A. fultonensis may be distinguished from Snyder Creek specimens on account of being thinner and broader, but this seems to be due to flattening from pressure. The average size is larger in the Callaway. Occurrence—Abundant in the Snyder Creek shale of Callaway County, particular- ly near New Bloomfield. Most of the Snyder Creek specimens are less than 8 mm. in length. Rare in the Callaway limestone of Callaway, Montgomery and Boone Counties. Athyris vittata (Hall) Plate 17, figures 8-10, 15, 16. 1860. Athyris vittata Hall, Thirteenth Rep. New York State Cab. Nat. Hist., pp. 89-90, 1897. Athyris fultonensts Schuchert, Bull. U. S. Geol. Surv., 87, p. 147. 1901, Athyris fultonensis Kindle, Indiana Dept. Geol. Nat. Res., 25th Ann. Rept., - pp. 597-598. 1909. Athyris fultonensis Grabau and Shimer, North American Index Fossils, I, pp. 352-353, fig. 460. : 1911. Athyris fultonensis Cleland, Wisconsin Geol. Nat. Hist. Surv., Bull. 21, pp. 83-84, pl. 14, figs. 1-4. 1915. Athyris fultonensis Butts, Geol. Surv. Kentucky, ser. 4, III, pt. 2, pl. 45, figs. 3, 4. Hall's description—‘‘Shell ovate, subquadrate, gibbous with the mesial fold and sinus distinct; front conspicuously sinuate; hinge line short; cardinal extremities rounded. Ventral valve gibbous above, more convex than the dorsal; umbo prominent; the beak incurved and truncated in the plane of the longitudinal axis by a round foramen, curv- ing very abruptly to the cardinal and cardino-lateral margins; the center marked by a well-defined mesial sinus, which is continued nearly or quite to the beak and becoming much deeper and subangularly margined towards the front. Dorsal valve a little less gibbous than the ventral, sides regularly curving; the middle of the upper part distinctly prominent, and developed below in a strong mesial fold which is abruptly elevated in front. Surface marked by regularly imbricating lamellose lines of growth, which on the better preserved surfaces are finely crenulated on their edges and intermediate spaces striate.” ; Remarks—Specimens from the Mineola of Missouri show several variations from the Iowa specimens though the differences are not important. The greatest convexity of the pedicle valve is nearer the front margin in the Mineola specimens. The beak of the pedicle valve does not project as far back of the hinge line in the Missouri speci- mens as in the Iowa specimens. In most cases the fold and sinus are somewhat broader in the Iowa specimens than in the Missouri. The Missouri specimens are thicker com- pared to Iength than the Iowa specimens. Occurrence—Mineola of Ralls and Montgomery Counties. Abundant in Ralls County. — PELECYPODA. 111 MOLLUSCA Class PELECYPODA Order Prionodesmacea Family Solemyacidae Genus Clinopistha Meek and Worthen Clinopistha? rowleyi n. sp. Plate 25, figures 7 and 8 Description—Shell of medium size, suboval; height about two-thirds the length; basal margin gently and almost uniformly curving; posterior end rounded to truncate; anterior end rounded to pointed; part in front of the beaks about half as long as the part behind the beaks. Valves moderately to strongly convex. Surface marked with moderately coarse concentric lines of growth. No specimen has the hinge well preserved and the generic reference is, of course, uncertain. The species differs from Clinopistha antiqua Meek, in the greater length anterior to the beaks and shorter length posterior: Occurrence—Near the top of the Snyder Creek shale of Callaway County. Family Grammysiidae Genus Grammysia Verneuil Grammysia elliptica Hall Plate 25, figures 15 and 16 1870. Grammysia elliptica Hall, Notice Lamellibranchiata, II, p. 53. 1885. Grammysia elliptica Hall, Pal. of N. Y., V, pt. 1, pp. 365-366, pl. 58, figs. 1-12. 1913. Grammysia elliptica Clarke and Swartz, Maryland Geol. Survey, Middle and Upper Devonian, p. 606, pl. 59, figs. 11-12. Hall's description—‘‘Shell of medium or large size, transversely elliptical; length varying from one-sixth to one-third greater than the height; basal margin broadly curving, slightly sinuate about the middle; posterior margin abruptly rounded below and curving into the cardinal line ‘above, sometimes more or less truncate. Cardinal line arcuate. Anterior end narrow and abruptly rounded below the lunule. Valves regularly convex below, becoming more or less gibbous above the middle and in the umbonal region. ; Beaks sub-anterior, very prominent, strongly incurved, rising considerably above the hinge line. Umbonal slope rounded, arcuate. Cincture consisting of a fold and furrow, extending downward in a curving direction to the base of the shell, producing a gentle sinuosity in the basal margin. The fold is more strongly developed in the left valve and the furrow in the right one. Test thick, marked on the posterior and middle portions of the shell by fine, irregular, concentric striae, which become aggregated into fascicles on the middle of the shell; and on the anterior part marked by strong concentric undulations. No radiating striae have been observed. The hinge of the right valve shows 2 thickened plate bearing a single angular fold just beneath the beak. Nothing is satisfactorily known about the muscular impressions. Four specimens measure respectively 31, 57, 65 and 93 mm. in length, and 23, 36, 46 and 63 mm. in height.” . Remarks—This form is rare-and all specimens in the collections are imperfect. The identification, however; is fairly certain. Oceurrence—Snyder Creek shales of Callaway County, location 2. 112 THE DEVONIAN-‘OF MISSOURI. Superfamily Nuculacea Family Nuculidae Genus Nucula Lamarck Nucula cf. lirata (Conrad) Plate 25, figures 13 and 14 1842. Nuculites lirata Conrad, Jour. Acad. Nat. Sci., Phila., vol. VIII, p. 250, pl. XV, fig. 7. 1870. Nucula lirata Hall, oe Notice Lamellibranchiata, 2, p. 3. 1885. Nucula lirata Hall, Pal. N. Y., vol. V, pt. I, Lamellibranchiata II, p. 316, pl. XLV, figs. 5,°11, 15, 17-22;-24°25:\ply SEI) figs 5, 1903. Nucula lirata Clarke, N. Y. State Mus. Bull. 65, p. 462. 1909. Nucula lirata Grabau and Shimer, N. Am. Index Fossils, vol. I, p. 395, fig. 503d. 1913. Nucula lirata Prosser and Kindle, Maryland Geol. Surv., Middle and Upper Devonian, pp. 229-30, pl. 25, figs. 6-8 and 9, 10 (?). Description—‘‘Shell of medium size, ovate-triangular; length from one-third to one- fourth greater than the height; basal margin regularly curving, more abruptly rounded at the posterior extremity; cardinal margin slightiy arcuate, graduaily sloping toward the posterior; anterior end short, subtruncate, usually abruptly rounded. Valves very gibbous, ventricose in the umbonal region; beaks, at the anterior third or fourth of the length of the shell, distant, elevated, rising considerably above the hinge-line; umbo very prominent. Test thick, marked by regular, strong, subangular concentric undula- tions, which are crossed by extremely fine radiating striae.’’ Hall, 1885. Remarks—One internal mould from the top of the Snyder Creek shale agrees with ‘NN. lirata in shape and muscular impressions. The dentition is not preserved. It is much smaller than ordinary specimens of N. lirata, No exteriors have been collected. The identification is uncertain at the best. Occurrence—Snyder Creek shale, Cow Creek, Callaway County. Nucula snyderensis n. sp. Plate 25, figures 17 and 18 Description—Shell small, ovate; length about one-third greater than breadth; basal margin regularly curving, more abruptly rounded at posterior and anterior ex- tremities. Cardinal margin nearly straight, sloping gently toward the posterior; anterior end short, symmetrically rounded; part behind beaks about twice as long as in front. Valves thin; beaks only slightly elevated. Muscular scars small, deep; palial line dis- tinct. All of the specimens in the collections are internal moulds, and the surface markings are not preserved. The dentition is not preserved. The specimens differ from those identified as Nucula lirata (Conrad) in being much longer compared to the height, much less ventricose, and beaks less prominent. Occurrence—Snyder Creek shale, Cow Creek, Callaway County. Superfamily Pteriacea Family Conocardiidae Genus Conocardium Bronn Conocardium ohioense Meek Plate 26, figures 1-7 . 1873. Conocardium Ohioense Meek, Geol. Surv. Ohio, I, pt. II, Paleontology, pp. 203-206, pl. 18, fig. 9. 1885. Conocardium Ohioense Hall, Pal. N. Y., V, pt. I, Lamellibranchiata II, p. 411, pl. 68, figs. 2-3. lll PELECYPODA. 13 1901. Conocardium ohioense Kindle, 25th Ann. Report Indiana Dept. Geol. Nat. Res., pp. 686-687, pl. 15, fig. 7. _ 1909. Conocardium ohioense Grabau and Shimer, North American Index Fossils, I, p. 438, fig. 575. 1911. Conocardium ohioensis? Cleland, Wisconsin Geol. Nat. Hist. Surv., Bull. 21, p. 109, pl. 21, figs. 7, 8. Hall's description—‘‘Shell small, ovate, subtrigonal, ventricose behind the middle of its length; length one-third greater than the height. Posterior end prominent, produced in the middle and sloping abruptly to the post-cardinal angle. Anterior end abruptly contracted in front of the middle and prolonged, nasute, with the extremity narrowly rounded. The body of the shell is marked by about six strong radiating plica- tions on the ventricos2 portion of the value, and on each side more numerous and smaller plications. The interspaces between the ribs are marked by lamellose concentric striae. A specimen of this species has a length of 15 mm. and a height of 10 mm. This species differs from C. cuneus in being more narrowly ventricose, and the body of the shell marked by fewer plications, with a distinct constriction in front; the umbonal slope is more rounded and less oblique, while the posterior extremity is more produced than in the usual forms of C. cuneus and C. trigonale.”’ Remarks—This species is abundant in the Mineola of Montgomery and Ralls Counties, and has been collected from the Callaway of Moniteau County. The speci- mens are small and display considerable variations. Most of the specimens show about six strong plications and all others much smaller but in some speci- mens the plications are nearly equal in size. Ordinarily the plications on the anterior slope of the ventricose part are the stronger but on some specimens those on the posterior slope are larger than on the anterior. Commonly a longitudinal groove marks or divides each plication but some specimens have simple plications. Commonly the anterior end projects to form a dorso-ventral ridge with both sides of the ridge convex, but some speci- mens are produced to a point and the front is concave in all directions from the point. The writer attempted to describe the most ventricose form, the one with the most pointed ends, as a new species, but the descriptions all led back to C. ohioense. Occurrence—Abundant in the Mineola of Montgomery and Ralls Counties. Two specimens have been collected from the Callaway of Moniteau County. Superfamily Trigoniacea Family Trigoniidae Genus Schizodus King Schizodus chemungensis (Conrad) Plate 27, figures 4-7 1842. Nuculites Chemungensis Conrad, Jour. Acad. Nat. Sci., Phila., VIII, p. 247, pl. 13, fig. 13. 1885. Schizodus Chemungensis Hall, Pal. N. Y., V, pt. 1, Lamellibranchiata sec. 2, pp. 453-454, pl. 75, figs. 37-40, 41, 45. 1891. Schizodus Chemungensis Whiteaves, Cont. to Canadian Pal., p. 241, pl. 30, figs. 5, 5a. 1909. Schizodus chemungensis Grabau and Shimer, North American Index Fossils, I, p. 482, fig. 642b. 1913. Schizodus chemungensis Clarke and Swartz, Maryland Geol. Survey, Middle and Upper Devonian, pp. 644-645, pl. 64, figs. 3-5. Hall’s description—Shell large, rhomboid-ovate; length one-fourth greater than the height. Anterior margin broadly rounded, curving into the basal margin, which is sometimes. nearly straight posteriorly. Post-inferior extremity angular. Posterior margin obliquely truncate. Cardinal line straight, less than half the length of the shell. 114 THE DEVONIAN OF MISSOURI. Valves depressed-convex below, becoming gibbous in the middle and above. In its usual condition of preservation the shell is very much depressed. Beaks at about the anterior third, prominent. Umbenat mle cob-anguler, defined above, less prominent below. Surface marked by fine concentric striae of growth, which are partially pier in the cast. Three DERERS measure respectively 33, 35 and 43 mm. in length, and 25, 29 and 30 mm. in height.” Remarks—This species is abundant on Cow Creek, near the top of the Snyder Creek shales, but is rare at other places. It exhibits considerable variation. The pos- terior margin varies from obliquely truncate to a nearly regular curve; in some speci- mens the length is one-half greater than the height. In the longer shells the beaks are proportionately nearer the anterior end. All of the specimens are interior moulds and © do not retain the surface markings._ The series seem to include forms described by Clarke and Swartz as Schizodus trigonalis. Superfamily Mytilacea Family Modiolopsidae Genus Modiomorpha Hall Modiomor pha bisitingeenets n. sp. Plate 25, figures 3-6, 10 and 11 Description—Shell small; length little greater than the height; basal margin gently curved; posterior margin rounded in about the same way above and below, narrow at the extremity; cardinal margin oblique; nearly straight though diverging slightly from a straight line at the beaks. Anterior end projecting in front of the beaks, rounded much like the posterior end. Valves moderately and regularly convex: Hinge line extending little more than one-third the length of the shell though its length is about half that of the shell. Beaks small, pointed, directed forward. Umbonal region not sharply set off from the rest of the shell. Test marked by strong, irregularly spaced concentric striae. This form differs from M. concentrica (Conrad) in the termination of the hinge © line a short distance in front of the beaks and the regular downward curve from this point’ to the anterior end of the shell. The concentric ridges are much coarser than in M. concentrica (Conrad); the shell is comparatively shorter and thicker. Occurrence—Snyder Creek shale of Callaway County. Genus Goniophora Phillips Goniophora hamiltonensis (Hall) Plate 25, figures 1 and 2 1870. Sanguinolites hamiltonensis Hall, Prelim. Notice Lamellibranchiata, 2, p. 36. 1877. Goniophora hamiltonensts Miller, Cat. Amer. Pal. Fossils, p. 192. 1885. Goniophora Hamiltonensis Hall, Pal. N. Y., V, pt. 1, Lammellibranchiata 2, pp. 296-297, pl. 43, figs. 8-15, 17-21. 1901. Goniophora hamiltonensis Kindle, Indiana Dept. Geol. Nat. Res., 25th Ann. Rept., pp. 684-685, pl. 16, figs. 4 and 5. 1903. Gonitophora hamiltonensis Clarke, N. Y. State Mus., Bull. 65, p. 390. 1909. Goniophora hamiltonensis Grabau and Shimer, North American Index Fossils, I, p. 519, fig. 699c. , ==. .7 == Pee. PELECYPODA. 185 1913. Goniophora hamiltonensis Prosser and Kindle, Maryland Geol. Survey, Middle and Upper Devonian, PP. 271-272, pl. 33, figs. 11-13; Clarke and Swartz, p. 651, pl. 65, fig. 3. Hall's description—'‘Shell large, trapezoidal; length more than twice the height; basal margin gently curving, sometimes nearly straight and slightly affected by the sinus. Posterior margin obliquely truncate. Anterior margin concave below the beak and abruptly rounded below. Cardinal line very slightly arcuate, extending for two- thirds the length of the shell; margins inflected, forming a long, deep escutcheou. Valves moderately convex below the umbonal ridge, and concave above it to the cardinal line. Beaks sub-anterior, small, closely incurved, situated from one-fourth to one-sixth the length of the shell from the anterior margin. Umbonal ridge angular, strongly de- fined, arching over the beaks and extending in nearly a direct line to the post-basal ’ extremity. Umbonal region scarcely gibbous, separated from the anterior end by a broad undefined sinus, which becomes obsolete in some specimens, owing to compression. Test of moderate thickness, marked by regular, prominent, lamellose striae.”’ Remarks—This is a rare form in the Snyder Creek shale and only eight specimens are in the University of Missouri Collections. The specimens differ in no essential details from those from other localities. A small part of the posterior end is missing from each specimen. Occurrence—Snyder Creek shale of Callaway County. Order TELEODESMACEA Superfamily Lucinacea Family Lucinidae Genus Paracyclas Hall Paracyclas elliptica Hall Plate 36, figure 1. 1843. Paracyclas elliptica Hall, Geol. N. Y., pt. IV, Rep. Fourth Dist., p. 171, te Os ie... 1872. Lucina (Paracyclas) elliptica, var. occidentalis, Hall and Whitfield, Twenty- fourth Ann. Rep. N. Y, State Mus. Nat. Hist., p. 189. 1883. Paracyclas elliptica Hall, Pal. N. Y. vol. V, pt. I, pl. 72, figs. 23-30. 1885. Paracyclas elliptica Hall, Pal. N. Y., vol. V, pt. 1, Lamellibranchiata 2, p. 440, © pl. 72, figs. 23-33, pl. 95, fig. 18. 1889. Paracyclas elliptica Nettleroth, Kentucky Fossil Shells, pp. 209-210, pl. 2, figs. 1-3. 1909. Paracyclas elliptica Grabau and Shimer, North American Index Fossils, I, pp. 554-555, fig. 760d. 1911. Paracyclas elliptica Cleland, Wisconsin Geol. Nat. Hist. Surv., Bull. 21, p. 117, pl. 25, figs. 3-5. Hall's description—"'Shell large, sub-circular or broadly sub-elliptical (subject to great variation in form from compression); length and height about equal. Pallial margin regularly curving from the extremities of the hinge. Cardinal line short, more than one-third the length of the shell, slightly arcuate. Valves regularly convex, some- what regularly gibbous in the middle. Beaks a little anterior to the middle, small, appressed and closely incurved, rising but little above the hinge line. Umbonal slope defined above by a depression extending from the beaks to about the middle of the pos- terior extremity, distinctly limiting the post-cardinal slope of the valves. Test thin, Surface marked by fine concentric striae, which are aggregated into fascicles at irreg- ular distances. Ligamental groove narrow and elongate. Posterior musclar impression just within the post cardinal margin and below the ligamental groove. Pallial line parallel with the basal margin, marked in the cast by a row of elongate nodes, which are the 116 THE DEVONIAN OF MISSOURI. terminations of low ridges from above. Interpallial area pustulose on the cast. Five specimens measure respectively 30, 32, 40, 44 and 48 mm. in length, and 29, 33, 37, 40 and 44 mm. in height.” Remarks—This species is abundant in some places in the Snyder Creek shale, and _ especially so on Cow Creek at locality 2. The variety in size and shape is remarkable and if the varieties were collected from several localities they might be referred to two or more species. Some specimens are 1 14 times as long as wide, while others are nearly as wide as long. Some are 2/3 as thick as wide, while others appear thin and are less than half as thick as wide. Occurrence—Callaway limestone and Snyder Creek shale. Paracycles lirata (Conrad) Plate 25, figures 9 and 12 1838. Posidonia lirata Conrad, Geol. Surv. N. Y., Ann. Rept., p. 116, pl. (unnumbered), fig. 12. 1872. Posodonia (Paracyclas) lirata Hall and Whitfield, Twenty-fourth Ann. Rept. N. Y. State Mus. Nat. Hist., p. 200. 1885. Paracyclas lirata Hall, Pal. N. Y., V, pt. 1, Lamellibranchiata 2, pp. 441-442, pl. 72, figs. 2-19; pl. 95, fig. 19. 1901. Paracyclas lirata Kindle, Indiana Dept. Geol. Nat. Res., 25th Ann. Rept., pp. 673-674, pl. 15, fig. 10. 1903. Paracyclas lirata Clarke, N. Y. State Mus., Bull. 65, p. 483. 1909. Paracyclas lirata Grabau and Shimer, North American Index Fossils, I, p. 555, fig. 760b. 1911. Paracyclas lirata Cleland, Wisconsin Geol. Nat. Hist. Survey, Bull. 21, p. 118, - pl. 25, figs. 6 and 7. 1913. Paracycles lirata Prosser and Kindle, Maryland Geol. Survey, Middle and Upper Devonian, pp. 277-278, pl. 34, figs. 11-14. Hall's description—‘‘Shell of medium size, subcircular or broadly elliptical; length a little greater than the height; margins regularly rounded; cardinal line short, less than half the length of the shell. Valves moderately convex below, becoming gibbous on the middle and above; beaks anterior to the center, small, appressed, rising but little above the hinge line; post-cardinal slope not defined. Surface marked by fine concentric striae, and by strong subangular concentric ridges, which are more or less sharply defined, depending upon the condition of the specimen and the nature of the matrix in which the fossil is imbedded.” Remarks—The specimens from central Missouri, though numerous, are all some- what worn and specific reference is somewhat uncertain. The surface markings are not as prominent as on Indiana and New York specimens but this may be due entirely to wear. A well-marked difference between this species and P. elliptica Hall is the much greater proportional thickness of P. elliptica Hall. P. lirata is a much smaller form. Occurrence—Abundant near the top of the Snyder Creek shale in Callaway County. ~ OO OO ’ aie mae GASTROPODA. Le Class GASTROPODA SUBCLASS STREPTONEURA Order Aspidobranchia Suborder Docoglossa Family Bellerophontidae 7 Genus Bellerophon Montfort _ Bellerophon sp. Plate 27, figures 2 and 3; plate 30, figure 9 Bellerophon is represented by only one mould from the Mineola and by several small specimens from the Snyder Creek. The specimens are too imperfect to warrant specific identification. Savage identifies specimens from the Grand Tower of Illinois as B, pelops Hall. The specimen from the Mineola agrees with B. pelops in shape. Suborder Rhipidoglossa Family Pleurotomariidae ‘Genus Pleurotomaria Sowerby Pleurotomaria sp. undet. Plate 28, figure 2 A large gastropod too imperfect for specific determination. The shell is preserved only on a small part of the outer side of the body whorl. It is not possible to determine whether a slit was present. The figure on plate 28 does not show clearly the flatness of the tops of the whorls or the nodes on the margins of the flat places. Only one specimen has been collected. Occurrence—Mineola of Ralls County. Pleurotomarita isaacsi Hall and Whitfield Piate 28, figures 1, 10, 11 1873. Pleurotomaria Isaacsi Hall and Whitfield, New York State Cab. Nat. Hist. 23d Ann. Rept., p. 238, pl. 12, figs. 6 and 7. Hall and Whitfield’s description—‘‘Shell depressed, suborbicular, with moderately elevated spire and rapidly increasing volutions, three to four in number, flattened or slightly convex on the upper surface, rounded below, obliquely truncate on the periphery. Umbilicus very broad and open. Surface of shell apparently destitute of ornamentation. This species bears much resemblance to the P. arata Hall, from the Schoharie grit of New York and may be considered as a western representative species appearing to hold a very similar geologic position. It differs in the absence of the transverse fur- rows, crossing the upper side of the volutions, which characterize P. arata Hall.” Remarks—This is a common form in the Snyder Creek shale, but most of the specimens are misshapen, and the shape of the shell is the only means of identification. 118 THE DEVONIAN OF MISSOURI. Pleurotomaria providencis Broadhead Plate 26, figures 19 and 20 1896. Pleurotomaria Previdencis Broadhead, Am. Jour. Sci., 4th Ser. II, pp. 237-239, figs. 1-7. ; 1918. Plewrotomarta providencis Branson, Geology of Missouri, pp. 100-101, pl. 3, fig. 12. : ; Broadhead’s description—‘‘Shell subglobose, depressed, spire moderately elevated. Volutions three or four, the last whorl much expanded. Aperture circular. Surface marked by numerous striae or lines of growth which are occasionally imbricated, strongly marked and unevenly fasciculated. A sulcus one-tenth of an inch broad and about one-half as deep divides the upper and lower part of each whorl. The striae as they pass from the suture curve backwards increasing in curvature as they approach the median sulcus, where they are so much crowded as to form a low border to the sulcus. In crossing the sulcus they are concave in front. On the lower side of the sulcus they also curve backward and form a sharp border to the sulcus similar to that formed above. In average-sized specimens there is a row of prominent nodes about half way between the sulcus and the suture. These nodes at their upper and lower portions are elongated into a low ridge which follows the direction of the lines of growth of the shell, but in soon blended into the body whorl. There is also another range of nodes below the sulcus and sometimes a faint appearance of a second row. The shell also presents a somewhat nodular appearance just below the suture. The suture is well defined. Genus Diaphorostoma Fisher ° Diaphorostoma genevievensis n. sp. Plate 39, figures 7, 8 and 9. Description—Shell small. Spire elevated above the body whorl; one to two volu- tions above the body whorl. The body whorl expands rapidly. The aperture seems to be nearly circular though it is not well enough preserved in the specimen to determine its outline positively. Surface marked by fine concentric striae about 10 to the milli- meter. The cotypes measure 8 mm. as greatest width of body whorl. and 6 mm, as greatest height of shell. The apical angle is 96 degrees. i The shell is remarkable for its small size and perfection of minute striae. Occurrence—Grand Tower limestone of Little Saline Creek. CEPHALOPODA. 157 Subclass EUTHYNEURA Order Opisthobranchia Suborder Conulariida Family Tentaculitidae Genus Tentaculites Schlotheim Tentaculites sp. undet. Plate 39, figure 6. Fragments of Tentaculites are common in the St. Laurent limestone and are present in the Beauvais sandstone. The fragments are too imperfect for specific reference. The specimen which shows best is an impression .9 of a millimeter in diameter with 3 annulations per millimeter. The annulations are closer together than in any described species and take up more of the space. This specimen is from the Beauvais sandstone. The same species is found in the St. Laurent but another species in that formation has much less prominent annulations. : Class CEPHALOPODA Subclass Tetrabranchiata Order Nautiloidea Suborder Orthochoanites Famiiy Orthoceratidae Genus Orthoceras Breynius Orthoceras cf. subulatum Hall Plate 37, figure 10. 1843. Orthoceras subulatum Hall, Geol. New York, Rept. Fourth Dist., p. 180, fig. 1. 1861. Orthoceras subulatum Hall, Descriptions of New Species of Fossils, etc., p. 49. 1862. Orthoceras subulatum Hall, 15th Rep. N. Y. State Cab. Nat. Hist., p. 77: 1879. Orthoceras subulatum Hall, Pal. New York, vol V, pt. 2, pp. 283-284, pl. 38, fig. 3; pl. 84, figs. 1, 2, 4, 6-10; pl. 86, figs. 1, 2. 1910. Orthoceras (Geisonoceras) subulatum Grabau and Shimer, North American Index Fossils, II, pp. 52-53, fig. 1252, b. 1912. Orthoceras cf. subulatum Kindle, Bull. U. S. Geol. Surv., 508, p. 106. 1913. Orthoceras subulatum Prosser and Kindle, Maryland Geol. Surv., Middle and Upper Devonian, pp. 308-309. pl. 39, figs. 1, 2. Hall's description—‘‘Shell straight, regularly enlarging from the apex to near the aperture. Transverse section circular. Apical angle varying, in normal and com- pressed specimens, from six to nearly eight degrees. Initial extremity observed, but the characters are obscure. Chamber of habitation well developed, having a length equal to about three times its diameter at the last septum, regularly expanding to a point near the aperture where it is slightly contracted. Air chambers numerous, increasing in depth from the apex to the outer chamber, where the depth is about three mm. Septa smooth, thin, having a concavity equal to an arc of about 125 degrees. Sutures straight and horizontal, but little impressed on the internal mould. 158 THE DEVONIAN OF MISSOURI. Siphuncle small, subcentral, only observed at the septa, where its diameter is one mm., the tube having a diameter of fifteen mm. at the same point. Test thin, usually showing a thickness of .2 mm.; sometimes it is considerably stronger over the anterior portion of the chamber of habitation. Surface marked by very fine, irregular, lamellose striae of growth. Some of the specimens show longitudinal striae, and more rarely very fine, filiform, longitudinal markings.” Remarks—Fragments from Missouri agree with O. subulatum Hall, but as the iving chamber is not present and a constriction in the living chamber is the main difference between this species and O. constrictum Vanuxemi the reference is uncertain. The location of the siphuncle has not been positively determined and the larger specimens may belong to O. exile Hall. Occurrence—Grand Tower limestone of Little Saline Creek. Family Rhadinoceratidae Genus Nephriticeras Hyatt Nephriticeras Plate 37, figure 8, 9; plate 38, figure 4. Fragmentary specimens of two species of this genus from the Grand Tower lime- “stone are in the collections of Walker Museum. Suborder CYRTOCHOANITES Family Phragmoceratidae Genus Gomphoceras Sowerby Gomphoceras nae emeanee n. sp. Plate 37, figures 6 and 7. Descripiton—Shell of medium size, nearly straight; transverse section oval; place of greatest diameter the chamber adjoining the living chamber. Living chamber with the sidés convex and contracting gradually to a place 22 mm. from the base. From this constricted band outward the sides are nearly straight. The aperture is narrowly oval. The average depth of the air chambers is 4 mm. 14 chambers are preserved in the type specimen and there is little difference in their depth. - The septae are slightly curved backward on the less convex surfaces. Siphuncle not observed. The specimen is remarkable for its symmetry. Occurrence—Grand Tower limestone of Little Saline C reble Gomphoceras hyatti Whitfield Plate 38, figure 1. 1882. Gomphoceras Hyatti Whitfield, N. Y. Acad. Aci., 2nd Ann. Report, p. 206. 1893. Gomphoceras Hyattt Whitfield, Ohio Geol. Surv., vol. VII, pp. 427-428 pl. 4, fig. 1; pl .5, figs. 1-2. 1910. Poterioceras hyatti Grabau and Shimer North American Index Fossils, II, p. 128° fig, 137442), Bs, : Whitfield’s description—‘‘Shell large and robust, slightly arcuate throughout, but more strongly curved below than in the upper part; somewhat rapidly expanding from below upward to near the middle of the outer chamber, where it is suddenly contracted to the aperture, and on the lateral margins again slightly expanding. The rate of increase in diameter, as compared with the increased length is about as one and two, when meas- CEPHALOPODA. 159 ured on the inside curvature. Transverse section of the shell obtusely subtriangular, flattened or but slightly convex on the inner surface, rounded on the lateral surfaces, and obtusely rounded on the back; the dorso-ventral and lateral diameters are about.as four and five, and the triangular form is more perceptible in the earlier stages of growth, owing to the greater convexity of the inner face in the upper portion and on the outer chamber. Outer chamber comparatively short, being about two-thirds as high as wide. Aperture large, irregularly tri-lobed, straight on the inner face and about four-fifths as wide as the entire width of the shell, and apparently about two-thirds as wide in a dorso-ventral direction as laterally. The exact form of the aperture on the outer side cannot be ascertained, owing to the imperfection of the specimen in this part. Septa moderately concave, very closely arranged in the lower part but more distinctly dis- posed above; the rate of increase in distance somewhat gradual to near the upper portion, where two or three‘of the septa are slightly more crowded. [n the more distant portions three chambers occupy the space of one inch, but in the lower part of the specimen, where the transverse diameter is a little more than one and a half inches, they are less than one-twelfth of an inch apart. Siphuncle of moderate size and subcentrally situated. Surface of the shell unknown.”’ Remarks—A specimen from the Grand Tower limestone probably belongs to this species though the lack of diagnostic characters of the group makes positive identifica- tion impossible in most cases. The specimen is larger than the one figured by Whitfield and it does not show as much curvature as that specimen. More of the smaller end is missing than in the Ohio specimen. The aperture, shape, size, and living chamber are much alike in the specimens from Ohio and Missouri. The depth of the smaller chambers is not as smaH on the Missouri specimen, but the transverse diameter at the small end is 114 inches in the Ohio specimen and more than two inches in the Missouri specimen. Occurrence—Grand Tower limestone, 3 miles south of St. Marys. Fig. 10. Outline of the aperture of Gomphoceras hyatti Whitfield. Gomphoceras cf. impar Hall Plate 37, figure 1. 1879. Gomphoceras impar Hall, Pal. New York, vol. V, pt. 2, p. 332. * 1888. Gomphoceras impar Hall, Pal. New York, supplement to vol. V, pt. 2, in vol. VII, pl. 120, fig. 4; pl. 121a, fig. 1. Hall’s description—‘‘Shell straight, exogastric. Transverse section broadly oval. Point of greatest transverse section near the base of the chamber of habitation. Tube regularly enlarging to the last septum, where it is slightly constricted. Apical angle about 30°. Chamber of habitation large, with a length equal to the greatest ventro-dorsal di- ameter. The dorsal side slopes somewhat more abruptly toward the aperture than the 160 THE DEVONIAN OF MISSOURI. ventral side. The tube gradually enlarges back of the aperture, and suddenly expands to the point of the greatest transverse section. The crenulated band in the cast forms a deep, narrow fossa at the base of the grand chamber, and is crossed by furrows, of which there are about four in the space of twelve mm. Aperture sub-oval, having a length equal to the greatest ventro-dorsal diameter, or about twice its transverse diameter. The small aperture is indicated by a sinus in the margins of the large aperture. Air-chambers numerous, regularly increasing in depth from the apex to near the base of the outer chamber, varying in depth from four to six mm. in the length of seventy mm. The last two air-chambers are shallower than the preceding. Septa not observed. Sutures straight and horizontal. Siphuncle, test and surface-markings unknown.” Remarks—One Missouri specimen has many of the characters of G. impar. The shell is constricted at the base of the living chamber. The outer two air-chambers are much shallower than the others. The depth of the air-chambers ranges up to 7 mm. rather than to 6 mm. as inthetype. The shapes of the living is and of the aperture are indistinct. Occurrence—Grand Tower limestone of Little Saline Creek. Gomphoceras missouriensts n. sp. Plate 37, figures 2, 3, 4 and 5; plate 38, figure 2. Descrittion—The known specimens of this species are all moulds of living chambers. The living chambers are small. They range in size from 18 mm. in greatest diameter to 38 mm. As the outer ends are missing the length of the chamber cannot be de- termined. Ina specimen 18 mm. in diameter 23 mm. of length is preserved, and in the specimen 38 mm. in diameter the length is 38 mm. The peculiarity of the chamber is in its almost straight sides of 12 to 14 mm.; abrupt narrowing from 18 to 13 mm.; and the much narrowed part proceeding outward at an angle of about 145 degrees from the outer part. The aperture of the only specimen that retains it nearly complete is subangular at the sides and has a diameter of 13 mm. in one direction by 10 mm. in the other with regularly curving sides from the subangular parts. The siphuncle is small and located subcentrally. One specimen, which is referred to the same species, retains four air chambers. These slope apexward at an angle of 38 degrees. This specimen differs from the others in the restriction of the living chamber being much more pronounced. It narrows abruptly from a diameter of 31 mm. to 22 mm. In this specimen the shoulder forms almost a right angle while the others slope in much more gradually. Occurrence—Grand Tower limestone of Little Saline Creek. Gomphoceras plenum? Hall Plate 38, figure 3. 1886. Gomphoceras plenum Hall, Fifth Ann. Rept. State Geologist, Expl. pl. (121a) 6, figs. 3, 4. 1888. Gomphéceras plenum Beecher, Pal. New York, supplement to vol. V, pt. 2, in vol. VII, pp. 33-34, pl. 121a, figs. 3, 4. Beecher's description—‘‘Shell large, stout, sub-fusiform. Transverse section circu- lar; point of greatest gibbosity at about the tenth septum from the chamber of habita- tion. Axis nearly straight. Tube rapidly enlarging to the point of greatest transverse section, more gradually contracting to the outer third of the grand chamber, and ab- ruptly constricted at the aperture. Chamber of habitation as long as the diameter of the tube at the last septum. Aper- ture obscurely trilobate. Air-chambers from 6 to 7 mm. in depth over the larger portion of the shell; the last three being shallower. Sutures slightly curved. eo eh CRUSTACEA. 161 Siphuncle situated near the ventral side of the tube; its elements in the interseptal spaces have not been observed. Test not preserved. Internal mould smooth.” Remarks—The only specimen in the Missouri collections of Walker Museum is a fairly perfect living chamber 68 mm. by 56 mm, at the detached end; 75 mm. long. The center of the siphuncle is 7 mm. from the lower edge of the chamber. The aper- ture is subtriangular with its greatest diameter about 43 mm.- The outline of the aperture is indistinct. Occurrence—Grand Tower limestone of Little Saline Creek. ARTHROPODA Class CRUSTACEA Subclass Trilobita Order Opisthoparia Family Proetidae Genus Proetus Steininger Proetus crassimarginatus Hall and Clarke Plate 39, figure 4 Pl. 21, figs. 8-10; pl. 30, figs. 6-8 Description and synonomy on pages 125 and 126. Remarks—A few fragmentary pygidia of this species are in the collections. Occurrence—Grand Tower limestone of Little Saline Creek. Proetus haldemanz ‘Hall Plate 39, figure 12. 1861. Proetus Haldemani Hall, Descriptions New Species of Fossils, etc., p. 74. 1888. Proetus Haldemant Hall and Clarke, Pal. New York, VII, pp. 113-116, pl. 21, figs. 7-9; pl. 23, figs. 13-15. Description abbreviated from Halli—‘‘Outline sub-elliptical or elongate-ovate. Sur- face convex, distinctly and equally trilobate. Length to width as 1.7. Cephalon semicircular or semi-lunate in outline; border broad, flat and rounded at the edge; widest in front and narrowing toward the genal angles, where it is very faintly produced. Surface evenly convex. Facial sutures normal, rapidly approximating on the frontal margin. D Glabella broadly conate, constricted opposite the anterior angles of the eyes. Sur- face depressed-convex. Length and greatest width about equal; the anterior extremity scarcely reaching the marginal sulcus, the posterior margin ending abruptly at the occi- pital furrow. Theanterior and lateral margins are bounded by shallow and inconspicuous furrows. Lateral furrows, as shown upon the cast of the lower surface, in. four pairs, accompanied by the posterior accessory depressions. Of these furrows the first pair is very short and transverse, the other three pairs and the accessory pair inclined obliquely backward. The fourth pair is strong and reaches to the posterior margin, but does not © open into the occipital furrow. Upon the surface of the test these lateral furrows would undoubtedly be less conspicuous, but no specimen has been observed in which the crust of the glabella is retained. Occipital lobes nfoderately strong; occipital furrow 6 . 162 THE DEVONIAN OF MISSOURI. narrow, impressed and scarcely widening upon the cheeks; occipital ring moderately broad, somewhat flattened and of about the same width along the posterior margin. Eyes relatively large and somewhat elevated above the surface of the glabella. Thorax composed of ten segments. ‘Pygidium rounded sub-triangular, slightly produced at ves extremity; length to width as 1 to 1.5. Surface convex, sloping evenly to the lateral and posterior margins. Composed of eleven or twelve flattened, transverse annulations, Pleurae broad and evenly rounding to the margins; bearing from eight to eleven annulations, each being grooved by a faint impressed line, which is most distinct near the axis and toward the margins. The border is moderately broad and thickened, widening to the posterior extremity, the annulations, with the exception of the first three or four becoming extinct upon reaching its inner margin. Surface smooth or minutely granulose.” Remarks—Three imperfect cephala and several nearly perfect pygidia have been collected in Missouri. The pygidia differ slightly from Hall’s figures in the glabella not narrowing so abruptly toward the front. The pygidium proportion is about 1 to 1.3 rather than 1 to 1.5 as in Hall’s specimens. Occurrence—Grand Tower limestone of Little Saline Creek, Ste. Genevieve County. Proetus sp. undet. Fragments of two other species of Proetus from the Grand Tower of southeastern Missouri are in the collections of Walker Museum, but it is impossible to make specific determinations from them. Order PROPARIA Family Calymenidae Geuus Homalonotus Koenig H seeomnies sp. undet. A few fragments of this genus have been collected from 3 miles south of St. Marys, Perry County, St. Laurent limestone. Family Phacopidae Genus Dalmanites Barrande Dalmanites sp. undet. Fragments of this genus have been collected from the Grand Tower limestone on Little Saline Creek. Genus Cryphaeus Green Cryphaeus boothi Green Plate 39, figure 10. 1837. Cryphaeus Boothtti Green, Am. Jour. Sci., XXXII, p. 343 and figure. 1888. Dalmanites (Cryphaeus) bootht Hall and Clarke, Pal. New York, VII, pp. 42-45, pl. 16, figs. 1-4; pl. 16a, figs, 3-8. 1910. Cryphaeus boothi Grabau and Shimer, North American Index Fossils, II, p. 329, fig. 1648 a-b. 1913. Dalmanites (Cryphaeus) boothi Prosser and Kindle, Maryland Geol. Surv., Middle and Upper Devonian, pp. 333-334, pl. 44, figs. 1-4. Prosser and Kindle’s description—‘‘General form suboval, laterally and posteriorly fimbriate; length about one-half.greater than the width; surface depressed-convex, ; : : ‘. CRUSTACEA. 163 distinctly trilobate; axis prominent, elevated. Cephalon relatively large; outline semi- elliptical, faintly produced on the frontal margin; length to width as 1 to 2; margin thick- ened by a broad doublure which is produced at the genal angles into broad, thin and blunt spines that normally reach to the sixth thoracic segment; glabella elongate sub- pentagonal, length and width equal and nearly equal to length of the cephalon; three pairs of transverse furrows conspicuous; eyes large, elevated, exceeding the height of the glabella; visual surface lunate with 206 lenses for each eye. Thorax length to width as 1 to 1.5; axis arched, widest at the fourth segment, tapering thence evenly to the pygidium; pleurae flattened, gently deflected along the fulcrum. Pygidium subtri- angular, depressed convex; axis tapering with slightly incurved margins, and ending ab- ruptly just within the posterior border, with from ten to fourteen annulations; the pleurae each bear five sulcate annulations, the anterior limbs.of which are flattened, thickened and produced beyond the margin as short, flat and closely set spines; a similar spine, but shorter and relatively broader, is produced in the axial line, thus making eleven spines in the pygidial fimbria. In the normal forms the entire surface is covered with granulations which become quite strong on the axial region of the glabella and thorax, and the surface of the pygidial fimbria, where the granules become elongate and pustuliform, often crowded and more conspicuous than upon the surface of the shield itself.” Remarks—Three pygidia are in the Walker Museum, and the identification is based on these specimens, Occurrence—Sandstone member of the St. Laurent, 144 miles west of Lithium, Perry County. Genus Phacops Emmrich Phacops cristata Hall Plate 39, figures 1 and 2. 1861. Phacops cristata Hall, Descriptions of New Species of Fossils, etc., p. 67. 1861. Phacops bombifrons Hall, Descriptions of New Species of Fossils, etc., p. 67. 1888. Phacops cristata Hall and Clarke, Pal. New York, VII, pp. 14-19, pl. 6, figs. 1-13, 16-29; pl. 8a, figs. 1-4. 1901. Phacops cristata Kindle, Indiana Dept. Geol. Nat. Res., 25th Ann. Rep. p. 744. 1910. Phacops cristata Grabau and Shimer, North American Index Fossils, II, pp. 322- 323, fig. 1637. 1912. Phacofs cristata Kindle, Bull. U. S. Geol. Surv., 508, pp. 107-108, pl. 10, figs. 6-8. 1913. Phacops cristata Kindle, Maryland Geol. Surv., Middle and Upper Devonian, pp. 331-332, pl. 43, figs. 13-15. Hall gives the following brief characterization of the species: ‘‘The diagnostic characters of this species are very clearly defined, and may be summarized as follows: (a) the axial row of spines extending as far as the pygidium, (b) the short, stout spines on the genal angles, (c) the strongly protuberant glabella, (d) the comparative absence of tuberculations, except on the glabellar surface, (e) the ten or eleven crenulations upon each side of the sub-marginal furrow of the cephalon, (f) the dichotomous annulations of the pygidium.” Remarks—The specimens collected in Missouri are all imperfect cephala and pygidia. One cephalon has a spine preserved on the genal angle. The annulations on the pygidia are faintly to not at all dichotomous. The largest specimen is 22 mm. across the widest part of the cephalon, and the small size of the specimen suggests the variety P. cristata pipa Hall. Occurrence—Grand Tower limestone of Little Saline Creek. Phacops rana (Green) Plate 39, figure 5. 1832. Calymene bufo var. rana Green, Monograph of the Trilobites of North America, p. 42. 164 THE DEVONIAN OF MISSOURI. 1861. Phacops rana Hall, Descriptions of New Species of Fossils, etc., p. 55. 1868. Phacops rana Meek and Worthen, Geol. Surv. Illinois, III, pp. 447-449, pl. 11, figs. 1 a-e. 1910. Phacops rana Grabau and Shimer, North American Index Fossils, II, p. 323, fig. 1638, 1913. Phacops rana Prosser and Kindle, Maryland Geol. Surv., Middle and Upper Devonian, pp. 329-331, pl. 43, figs. 8-12. 1913. Phacops rana Clarke and Swartz, Maryland Geol. Surv., Middle and Upper Devonian, p. 699, pl. 72, figs. 8, 9. Description by Prosser and Kindle—‘‘General form elongate suboval; greatest width (measured at the posterior margin of the cephalon) to axial length as 1 to 2; the cephalon, thorax and pygidium are to one another in length as 1.5 to 2 to 1. Cephalon subsemi- circular, the regularity of the outline interrupted by the slight protrusion of the glabella ° and the genal extremities, frontal margin obscure, concealed’ by the overhanging gla- bella; facial sutures rarely discernible; glabella large, gibbous outline subpentagonal, greatest width anteriorly, posterior furrow extending clear across the glabella; cheeks abruptly sloping to the margin, narrowing anteriorly and reflected ventrally to form the doublure; eyes prominent, scarce reaching the height of the glabella in uncompressed specimens, visual area lunate, separated from the cheek by a strong smooth sulcus, aver- age number of lenses in normal adults is between forty and fifty for each eye. Thorax subquadrate, lateral margins slowly tapering, surface strongly trilobate; axis flattened at the margins, evenly convex in the middle, widest at the third or fourth segment, tapering very slowly to the ninth, and thence much more rapidly to the pygidium; pleurae flat for about one-third their width from the axis and thence abruptly deflected to the margin, each segment bears a furrow which becomes obsolete at the fulcrum. Pygidium relatively small, regularly and evenly rounded margin the posterior part of which forms | the arc of a circle; axis composed of nine annulations, rapidly and evenly tapering from the last segment of the thorax, reaching an acute termination just within the posterior margin; pleurae seven in number, broad depressed-convex, and sloping evenly to the posterior margin. Surface of the test ornamented with tubercles, which are largest and most closely set upon the glabella.”’ Remarks—Fragments from the sandstone member of the St. Laurent have been referred to P. rana though no specimen is complete enough to make it possible to deter- mine that it does not belong to P. cristata Hall. The reference is made to P. rana on account of the age of the rocks in which it occurs. Occurrence—St. Laurent formation, 1144 miles west of Lithium, Perry County. VERTEBRATA Class PISCES Subclass Teleostomi Order Crossopterygii Family Onychodontidae Genus Onychodus Newberry Onychodus sigmoides Newberry Plate 39, figure 3. 1857. Onychodus sigmoides Newberry, Proc. National Institute, Washington, D. C., new series, 1, p. 124. 1889. Onychodus sigmoides Newberry, Monograph U. S. Geol. Surv., 16, pp. 56-57, pl. 36, figs. 1-4a; pl. 37, figs. 1-11. PISCES. . 165 1902. Onychodus sigmoides Hay, Bull. U. S. Geol. Surv., 179, p. 363. 1908. Onychodus sigmoides Eastman, Iowa Geol. Surv., 18, pl. 1, figs. 4, 11. 1908. Onychodus sigmoides Eastman, New York State Museum, Memoir 10, pl. 1, fie. 3; pl. 3, fig. ‘2. Newberry’s description—‘‘Fishes of large size; head at least eighteen inches long, composed of numerous angular and rounded plates, supported on a cartilaginous brain- - box, and so imperfectly united that in the fossil state they are usually disconnected and scattered. Of the head plates, the operculata are from three to five inches in diameter, nearly circular, but with a produced anterior angle. The maxillaries are triangular in outline, the anterior and posterior angles much produced, the lower margin nearly straight, and set with a large number of conical, pointed teeth. The dentary bone of the mandibles is often more than a foot in length, curved gently upward at its anterior extremity, which is rounded. Its posterior extremity is thin and flattened running off to a pointed edge, where it was overlain by the articular portion of the mandible. The upper margin of the dentary bone is thickly set with conical, pointed teeth. Embraced within the anterior extremities of the mandibles is an arch of bone, which supports a series of large, conical, sigmoidally curved teeth seven or eight in number, set vertically, and projecting downward, forward and upward. These teeth show several prominent roots, which: partially embrace the bases of the adjacent teeth. The ex- terior surfaces of the cephalic plates and the exposed portions of the maxillaries and mandibles are thickly set with small enameled tubercles, which have the form of ap- pressed, striated, or sulcated cones. The body was covered with relatively thin, highly ornamented scales. These have a circular or elliptical outline; the under surface is smooth, or faintly marked with concentric lines, and often bears a central elevated tuber- cle or ridge. The exterior surface shows an anterior semi-lunar space, occupying about half its area, where adjacent scales were superimposed. This space is comparatively smooth, but is delicately ornamented with radiating lines of pits. The posterior and exposed portion of each scale is roughened with appressed, striated tubercles, similar to those on the cephalic plates, and with branching, somewhat foliated ridges of enamel.” Remarks—Two sigmoidal teeth have been collected from the Grand Tower lime- stone of southeastern Missouri, but they are complete enough to make the identification satisfactory. Two specimens have been collected from the Callaway limestone of Moniteau County. 3 Unidentified fish remains ragments of bone indicate the presence of other fishes besides Onychodus sigmoides Newberry, but the fragments are too imperfect for generic identification. 166 é THE DEVONIAN OF MISSOURI. CHAPTER III THE FAUNA AND THE CORRELATION OF THE BAILEY LIMESTONE IN THE LITTLE SALINE CREEK AREA OF STE. GENEVIEVE COUNTY, MISSOURI, BY VS aS eee The Bailey limestone was named by Ulrich from its exposure at the former Bailey’s Landing on the Mississippi River, Perry County, Missouri. Fossils obtained from it at Bailey’s Landing have been described by Meek and Worthen;! and its occurrence together with fossils collected from it along the Mississippi River in Jackson and Union Counties, Illinois, and at a point across the riversin Perry County, Missouri, have been noted by Savage.? Its occurrence in Ste. Genevieve County, southeastern Missouri is described in a forthcoming repart on that county by Stuart Weller. Of the 64 or 65 species of fossils from the Bailey limestone in the Little Saline Creek area of Ste. Genevieve County, Mis- souri, 42 of the 49 accurately determined have been described from Lower Devonian strata of other localities. That the Bailey limestone of this region is essentially of New Scotland age—based on the New York Helderberg; and that it is related essentially to the New Scotland of Maryland, and to the Coeymans-New Scotland of the Helderberg of New Jersey is evident from the following tables 1 and 2. Table 1 gives the fauna of the Bailey limestone in the Little Saline Creek area, and the occurrence of contained species in New York, New Jersey, Maryland, Tennessee, Oklahoma, Gaspe, Quebec, and Dalhousie, New Brunswick. Table 2 is a numerical summary, based on Table 1, of the species of the Bailey limestone as they - occur in New York, New Jersey, and Maryland that brings out the relation of the Bailey limestone to the Helderberg of those States. The description of the Bailey limestone in the Little Saline Creek region and of related strata outside of the New York- New Jersey-Maryland area are given in the following table 3 while the substantiating faunal data for such relationship is included in tables 1, 2, 4, and 5. Table 4 gives the occurrence in Ii]. Geol. Surv., vol. III, 1868. *T1l. Geol. Surv., Bull. 8, pp. 112-113, 1907. | ‘a ‘ : Table L New York. New Jersey. Maryland Gas- —s aS = pe, Dalhou- a | Tennessee. Oklahoma. Que- sie Helderberg. Helderberg. Helderberg bec, N. B. Fauna of the Bailey limestone in the Little Saline * = a = = - Creek area, Ste. Genevieve County, w Q be z cs ca w Q af Zz 9. o = es - Q Tr Zz e e 2 > Q 2 cs 4 3 2 = es y z 2 2 iS) SSO S| 2 [aaa 8 | 8 |e | & Iasi ee | eo [ie Se | Se Sel Be ys se | ee We ee J 8 jeeel A fo | S 1 Wace ot PME sel ab lo Veal ool Seon ia we | ie no CS 2 lay (a) || Ssh Ge o |42e8 qa) pe o B a S 5 9 a& st eS Ss cae ee | el PS Sl ie) ae se Pa ont Sl Be 5 SS D ot 2 Be : S iT |} 2 a La es 5 es oo 5 n D a Sponges. Hindia fibrosa (Roemer)............ Me aye ORR ee : x x x 3 » N) = My * x Corals M 2. Streptelasma strictum Hall.............. Seer son x x x x : : 3. Favosites helderbergiae Hall..................... ae) x x x ‘ Ww 4 x x x x x x x 4. WFavosites conicus Hall.................. Give aero x ? , ’ : 5. Striatopora missouriensis M. & W. ?.............. gic tan J SRIBENOOD, LIE, SIEMNZ5 oo Onc ob eo oesanunbonoduduoeN 7. Pleurodictyum lenticulare (Hall)?.............. Crinoids. Seyphocrinus sp HAMOCHINMS As Dern enemies Seon Oba Roots Alsopocrinus anna n. sp....... Bryozoans. HISbulipOra; ZASD ye cisciswrars cis wapelerstemensesteeevare thas, eee Ones bellaeteSD or ques cee Ween eek rms erareeiee eta ett Brachiopods. Oraniazalsopiemntsp yee eee ro Si a wy 7 . - Dalmanella planoconvexa (Hall).................... X x Dalmanella perelegans (Hall).................... ; x x x x x 3 ms ‘8 > Dalmanella quadrans; (Hall), .-. 5.2245... eee ~ x = < : x . 5 Rbipidomel)l aro })la tay (ell) eee eran ener x x x x x a * x Rhipidomella discus (Hall).......... Adam, si Situs voyeh enees x Rhipidomella ellsworthi n. sp....................-. Rhipidomella melvillei n. sp......... POT OLS . Bilobites varica (Conrad)...... Ee ; se x aS a8 : : Pp ‘ e x : x x % Leptaena rhomboidalis (Wilekens)................. x x x x x x x x x x x : x 3 3 } Stropheodonta arata (Hall)........ disks patie x *S 3 ‘ & 2 Stropheodonta (Leptostrophia) planulata (Hall).... x x x bs + » x | e z z % K % Strophonella punctulifera (Conrad)............. aie x x x 3 as ‘i . x x x = e Leptaenisca concava (Hall)........ Pe A re OO x x = a - Anastrophia verneuili (Hall)........................ x . Gypidula multicostata Dunbar... .. Skis Ae ATO aid ; Rhynchotrema formosum (Aall)....... dass Solana x x . as x % ny x x Eatonia singularis (Vanuxem)...... eee ene : x ss ms AW Ee s x = Uncinulus nucleolatus (Hall)...... x as Uncinulus mutabilis (Hall)...... . x * Uncinulus subpyramidatus Weller. . x Wilsonia wadei Dunbar.......... = cA x Rhynchonella transversa Hall... . - Sod ong060 0 x 28 x x x Rhynchonella (?) bialveata Hall...... dc OBO DOO x . 55 x Rensselaerina medioplicata Dunbar................. Rensselaerina medioplicata var. latior Dunbar onda . wy & re Atrypina imbricata (Hall)............... 6.00 O0OnD s : FS x x xs x x x LNON OE) RATTLERS (CUISINE), - 5 oc oa so odo c gene neeee x x x x x BS x < . = Xx x x Delthyris perlamellosus (Hall)..................---- x x 2s < Delthyris missouriensis n. sp...............------::- Delthyris octocostatus (Hall) ?....................-. x x . 2 = x x Slo wiieye CGO MUGAUS IAMS «oon oo an nonececpnscacsne x x 2s x x ; x x x (Cratoines GEierean (SEND) 5 Ganaccaesouossebsnesecnnes x , c% x x x EWN GhOspinastOnmMo salsa) eee een iene x x aS x x Drematospira equistriata MH. & G.-...............-.- = x x x Nucleospira ventricosa Hall.......................- x as x : : x x x x Menistella) laevis) (Vianuxem)s. sss) ese ende oe x aS 38 pS IMI@MSWE) NEY IRIAN, 5 js concn os onnnoeansooacns x x MIAMI, OATES FAW, ooo ooccenenesoavgndedsanne x 2S x x x x MICS, CHORE, ChbZ = ooo panos ce pouusacecascuneue Pelecypods. LOAN Pn ocanosdsaddnsesocsonsoanadéagetor OConocardinmysprrgyeaine vcctor tee ee tateeetes Ayiculopecten ? umbonata (Hall) ?.................. Cypricardinia distincta Billings ?...............-...- Gastropods. Platyceras|pentalobus) Halll... ..5.....s00ssee. ceo. x Blaty Ceras|spr eyes cen sotto ye eo ieee eee anes Blatyceras 2asp renee cn, seta ersten oc ae DIED UCOKONONE) Gs 5-5 4acasenasosannedseoosocesaae Trilobites. x (COHWS lseimEyACh EAN, vga noe cae bose ascse x Dalmanites cf. griffoni Clarke....................-.- Dalmanitesisp repens eet tin ci ier rnin Dalmanites carlwegin. sp............ FACS coats x x x x x JOWEKAD YS laMoleoVMENS TEEN, |G - po pon na eo anon aaeoaees x i : x x x x x Paco NS LaZAM TIM. one yaaranenuquaavenecanane x zs s a - i? r 5 28 2. 7 10 8 DO CAISa a tee ae ee RRA TY Bea NE tie Gat 13 33 11 13 14 10 12 22 6 =) ZA ba : x==occurs. alt fe Under Maryland: W. V., P. = occurs in West Virginia, in Pennsylvania. _ BAILEY LIMESTONE. 167 the New York-New Jersey-Maryland area of those species of the strata—related to the Bailey limestone—of Tennessee, Oklahoma, Gaspe, Quebec, and Dalhousie, New Brunwsick, that are not present in the fauna of the Bailey limestone in the Little Saline Creek area but are in the New York-New Jersey-Maryland region. Table 5 is a numerical summary of species, based on tables 1 and 4, that indicates the extent of equivalence between the Bailey limestone and the related strata of Tennessee, Okla- homa, Quebec, and New Brunswick through the species held in common and through the age indications as judged from the New York section of those species of the beds of Tennessee, Okla- homa, Quebec, and New Brunswick that do not occur in the Bailey limestone but are present in New York. The Bailey limestone in the Little Saline Creek area of south- eastern Missouri is practically equivalent to the Olive Hill formation plus the Birdsong shale plus the Decaturville chert of western Tennessee; it is partially equivalent to the Haragan shale plus the Bois D’Arc limestone of the Arbuckle mountain region of Oklahoma, to the St. Alban beds of Gaspe, Quebec, and to the Dalhousie formation of Dalhousie, New Brunswick. THE DEVONIAN OF MISSOURI. 168 eee ee ee eee ee eee Z I 9 0 L 0 . 9 Ze ZI ez Paes Wy a agai reitane te ‘++ puepAreyr = 5 5 yf 0) £ ‘9 OL FL eL we 2 a6 A ae honk eee a ee Aasiot MONT ij! G cS 0 SI Zz II ee eI 9g © aig = Wes kieh ess ae Re kee eRe, fl yIOX MON ‘qgesrnog | .4yei00g , “qyeI00g pue pue *pueyjoog “‘puryyoog ‘puryjoog ‘ pure puryoog | pueyoos | Mon pue | ‘4yer00gq MON ‘suvursé009 | “4yer09g MON ‘sueutA90H | ‘puepjoog MON MON ° | SUeUTAI0D MON ‘suems000 . ‘suvuls000 “eOly 10} peuguoo oie pur 103 peuyguoo :U M990 4eY} selsads Jo JoquInN UI m9o90 4ey9 seloeds Jo 1equinN ore yey} sotoods Jo zoquinyy ‘3S ON WIV - Break. “lala BAILEY LIMESTONE. 169 TABLE NO. 3. Little Saline Creek Area, Ste. Genevieve Co., Missouri.! Bailey limestone—about 200 feet thick. Upper member—about 100 feet thick. Interbedded chert and limestone; lower portion highly fossiliferous. Crystalline, highly fossiliferous, gray limestone about 5 feet thick. Lower member—about 100 feet thick. Shaly zone with some chert; fossiliferous. Thin-bedded dolomite with nodules of chert a few inches in diameter. Western ‘Tennessee.? Decaturville chert—6 +feet thick. ‘‘Porous gray chert.” Break. Birdsong shale—35-65 feet thick. ‘*Bluish shaly limestone and shale.’’ Olive Hill formation. Flat Gap member—0-53 feet thick. ““Massive pure limestone.”’ Bear Branch—Pyburn member—0-45 feet thick. ‘“‘Massive limestone and oolitic hematite in north—impure cherty limestone in south.”’ Ross member—0-60 + feet thick. “Impure thin-bedded cherty limestone.’’ Arbuckle Mountains, Oklahoma.? Bois d’ Arc limestone—0-90 feet thick, average 60 feet. “Thin-bedded crystalline and non-crystalline limestone with occasional chert lentils and thin beds of intercalated yellowish shale.’’ Hargan shale—0-166 feet thick, average 100 feet. ‘Alternating blue to white shales and thin-bedded earthy limestones which weather into yellowish shales on long exposure.”’ Gaspe, Quebec.* St. Alban beds—160 feet thick. . “‘Greenish calcareo-argillaceous shales, which are interstratified with less calcareous layers, of various shades of red.’’—90 feet. i ‘““Gray limestones in layers of from six to eight inches thick, which are separated by bands of greenish calcareo-argillaceous shale, gradually increasing in amount towards the upper part.’’—70 feet. Dalhousie, New Brunswick.* Dalhousie formation. Feet. “From this point * * the section is concealed * * for a distance of 400 feet * * The total thickness of the sedimentary series * * is * * approximately 430 feet * * 16. Coral reef limestone * * shaly in lower part................cee006 : 35 15. Thin white limestone..... Saas en RR SOE ES Sok wi Bucle lev Battve tes) agi at oe eis Ce), PROVE MER Tea ho aera eS rr eae es Se ee ge we ee ee Aa 15 13. Ash bed with Rensselaeria stewarti..... i ae Oe AER Dee tee Sa i, a Reine are ee 1 12. Blocky calcareous shale with gastropods (Coelidium).................. 2 11. Ash beds alternating with thin limestones and shales all highly fossil- RR Or ea ke ere Tre abe See a peat B= Ee ee ee 30 SMG SE CSaWwati LATCNIT ATIC. cc,2% i .vicrHeiels eraen aa au wld sa Wa@le's'a cen es% 10 ‘ 1Data from forthcoming report on Ste. Genevieve Co., Missouri, by Stuart Weller. :Dunbar, ©. O., ‘tenn. Geol. Surv., Bull. 21, p. 27, 1919. ‘Reeds, C. A., Am. Jour. Sci., vol. 32, 4th ser., pp. 264, 265, 1911. ‘Logan quoted by Clarke, J. M., N. Y. State Mus., Mem. 9, pt. 1, p. 26, 1908. ‘Clarke. J. M.WN. Y. State Mus., Mem. 9, pt. 2, pp. 11-12, 1909. 170 ss ee oe ral THE DEVONIAN OF MISSOURI. Limestones and calcareo-argillaceous shales with profusion of corals and DracChiopoOasis « ic2> pcs 7s got ay ups catecamacepee thers belies ae aC ey ti ea cee ona eee ee eae Soft calcareous shales * * very rich in Leptaena rhomboidalis....:... Compact limestone beds overlying the eruptive; contains corals and other POSSE . acces eS Pes i ee he pec oa ice ae ner ce we ec : Volcanic boss * * near the middle of which lies a : detached mass of hardened and glazed calcareous shale * * 30 feet in transverse thickness, 15 feet in height * * This mass contains corals and brachiopods). 2.2 5.5 s «ceaat serait a Dleine pS ee EN eee Pe ee Compacted:gray blocky dimestane..2 4.55. wie eieds. « « «cas cgaieokasitucce patel seuP ants Coarse:conglomeratic ash bedi ox ree ee ee ale ohtad arapatai ahs unscohs, cata Hard blocky yellowish gray argillaceous limestone.................. “Pe, Gray to yellowish hard calcareous shales with thin beds of limestone..... Calcareous shale with Sieberella pseudogaleata, Leptaena rhomboidalis and in the lowest stratum corals * * No contact metamorphism......... Volcanic boss * * overlain by” 75 20 125 171 BAILEY LIMESTONE. oO a7 =| ° a = « (a) formation St. Alban beds “oaqenge ‘adsey * * * * * * * gg i) q -_ + s 32 a) © om 2s HS 6:5 | 24 —Q en} “euLoye TO ville chert Decatur- S ££ 2) F CHS lee 8 FS SF Ue UD Birdsong shale “9ossouue,, Olive Hill formation ‘YO ‘NO ‘PIN ‘HO Above pd = x e.3 x > oN 24 x om aS pe 214 x b 4 x ‘d PIN | x u a} 8 8 & D g = ry mal ® Os 3 jaa] aie io) “eare “PIN-"f “N-"A “N ‘y ON WTIEAVL ‘DIN te en a ae es (jleH) euUroUOD eyeueMeC PES elt eM Oe ach eects aL EMIT CE (eH) eyeuLeogns eTpueMTeEq ts Riemidtra > eee NED eae me (Tl@H) seprouswuo0ydorys erpdo1soqy10- ‘PIN ay (Oe, wR Bw) Oe ee Oe ee Oe Re Bed Be Sb) ae eee eee leo snjeAo sdopryoyd NCEA Ge CMD mer ect Se ua airtel ao CO w “AD eUIDTIeSe e][oIMeID ii p> sl nvidl ees swt gm sel SORRY el = ot aetna fests ht meee O07 'H eyjeqomnd eIUeIO sige al Ouest alfateh Sole eaas Se Sues ela a Kade, we ae (eH) ey eng ey ed AIQOUOTT Doe age (ele here Me ae) ene veins) = Daeg ie) aes e eee ee (Ile) suesojo10d e10doyeV@O Sp terre (a) RNR ST Ce tatee te ote anew en es meer eM 7O Bye (eH) WINSO|MIJeo SUIO[DOL'T Ssigtetl da et etic eee eT oP ete Ta) Ue an ef te (1eHm) mnso1epu0d eUle [DOr 6. ee oie al ae ny he Fare e on a le in ele ewe oe (eH) erosiquioy.1 e10doyyioO Be Set eis, wa Sina TAS = TS) 8 mis) eign) el Tas eR (eH) ®S001}.109 edAIVOPIIg Rikat SLs id hep a asieh lace! Oy aac itera Oita: wivels aie exw ere (eH) smuey er1odousreyd ‘PIN oie ee) he bitte teenie els Nee ei elem) am (6) ae ourA 9susLIMN{Is uUoAQOTPOOSY ‘oss sss ep sTTessIyO soyMUIOD x TUR et ic CATR ECR ic SO ORS NC 2 eH SNX?] siqiomdg Sead Ma Ryd RMaAH hay kay SL Su hy Wl cy eee ace lle@H sr IOJ[I00d snuLo0Mp A ee ie ch esercctervieveleterwnnse ah alle) = eiais: ehetaters (euurTT) snTzenue9ed seqIsATeH te ee ee EP Pd bs HY ‘G-IN Shomoydstmey soztsoae iy eee wee welds Jhieike te, :aetace, WOW pL ae aM eT a (19Z10}{) TWOATIYS SOJISOAC S nlrattelvele. picts s, pel ehace teh Linge tales eon p ma Taney eee ee AQIED stpni eyTeweounq Rie oe RO Dele Sea Sectlet Soe TuRMenie tau! (eH) aren Ue] man AQo1pomMe}d ‘PIN a: ota tm ete ee bel Boia ba taliwle bale a 1p, teste eim Magn) Ter rit Tee at leH eelreyoyos er10odony “MO1s01 ‘PIN-"f “N-"A “N 9} UE and00 4ey4 YNq “OTN ‘gore YOoIOD OUTTeS O[991'T OY} Ul OUOJseUNT] AOTIET ey} JO PUNY PeAJOsqoO 94} UI peyueseider 4ou soetoeds Below THE DEVONIAN OF MISSOURI. 172 Dalhous: formation ‘ad “N ‘91s “noy[ed beds “oeqond ‘edsexyy Bois d’Are limestone Haragan shale “euLOYe LAO ville chert Birdsong shale “eessouug,], Olive Hill formation e: fe) Above Becraft New Scot- land Coeymans Below “vole “PIN-'f “N-A “N ‘(mexnUe A) STTRIpeu eImOyen “"""(T@H) sngeoyjea sefnurpuyg ‘(peim0H) eyvodrmoes ermoeojo1emreD sseeec"*"“(T2H) eyeetesopnosd (e][e1eqerg) “9 Tees ss" “greqoOnyosg sisueuvulAeod (e][a1EqQeTs) eINpIdéyD OP 6k ieee Salle aie) it Wee le) a . qioqonyos sIsuoAJo£ er do1jsouoqg CPL Sa ee tO ae eae as oe ad Me a ee a . “(1l®H) 9uUSISUL wunipruesg ‘""@MOY OVISIOQJOploy eydouy Gaels 8 ia. 6/6) @leN Soe ke. ae ate ee se ee a) bd ‘H susoseupe eostueey dary Se ay pe re a **(Z1oqueTye A) sipesisAsue.sy seqimoqureyo0[g Riles spe al eM bret tw ares a sare arS, he sae *(moexnue A) snyeipes eTeyzeyonyosg wie Wal isita few ale oo ae wow whe eo. (Tle?) eueyyIOM[OOM eT [99194 on ys ‘“(TI®H) PueqQI0oMueAre] eTjeuoqdong ee Sa O18) 6 er. PRs. we Seta eck ee pee, eyIRIO azofeur (aod Aéyqoei1g) "s ere any Ra eatery mw ee Peer ye a a exIPLO eueyioqonyos (aod Aqoei1g) ‘sg me 8) wae) whale mi ede 6 2 oe) seme Ue . “OHIPIO ere ysiio (erydo.14s0}derq) ‘sg Reo WY 2 Cp Te eS ea a ADR OL eee *(11®H) eogimuseul (erydo14s04de'q) ‘Ss ab eel hee te (11@H) Tex9eq (erydo.4s0}deT) eyuoposydoyg a ey pig alse te 6, eR, al Rg a se ee *(perm0p) eV C1I4STIqoro equopoeydong YW) 8). & 6-8: w Old abn! aha ew is ee ee *(peim09) 2) CLISLIVA e,moposqdo.14g Rie wee oe wee ee ele 6) fe see ele ee *(1l®H) eVelI4siy[nuL elloqdozimog ai © a ale he 8.6 we me ey .0uy Cie ws se *(1l®H) eV euls1euo eT[ouLOprIdiy ye ee eres ee eee, Oe» 1 ee ee Oe ee ee ee ae 7 (1l®@H) sueurma eljouemyeqd *UO1Z01 *PIN-'£ (N-"A ‘N 99 UE M990 4ey9 Inq “OPT ‘eo1e YOOID SUIT’ 91991] O49 Ul ouOysomT AoTIEg 9y} JO VUNLJ PoATOSqO oY) UI poyUeseidoeI you setoedg ‘ponunu0op—Fr “ON WIV. 173 BAILEY LIMESTONE. * i Oo * * * * Co To en} ‘a0 ‘PIN ta w ee n KKK OK ta ww oT ‘N Se ee. am Nps Oh Baw IANO Ces ye, @ le oy aE Tene (10]]9 AA) sIsuosnijueur eIMepIOL ST 5 mm | iain era dada eg NM it a 8 Pp) SUS vehimyenewre, . (meer) st.amaoror soymemyeq SN TORR OC Ae ea ies (weeny) xA4domord soyrmemyeq Se es etter: SEA orca eae a erie Nae ++ -pemop snyemey snmursig 2 SAP reer St nish Lae tete Oey Ace -"CO RH) snamyposo ermeps09 Prey | eure oe Re eee (uoyeq) sNyWUeOeIAS soyMoequo J, ile P Se oe es Fosse eeeceeeessess + THEFT snqnoe soqTMNoe}UeL, Re ee rE et heater acpi oh Tpke Ra eH v4aeT elaeMU0D RWS Se ee eee ee [eH euenuny eaemu09 EI ere Pen RT AES ote co [eH wWnyeAdestoned ses0907310 salud Doeatta: os eee Ri eo ++ TeA snjountsrp snjeyduong Be cd yh aieribig emia nee ie bre anys ioe i tone (eH) ‘eyoeduL09 eosossTOTAL PT OS are ie hath) ort? Oe ae ann ie ce ee eee ae eee eee *(11@H) 4 CITTIG eardsoydo'y Spy [iirc eh eee oti Sse “TRH osuoresera euroysoAgTeg eS a aah wine ab (pem0O) wNsodNyUeA eUTOJSO1OydeIG ode Se yl gid Pen aee Oe ce RE EN * -TyeH, oursoymsun ses0044e1q onermirtice cock cra re Wat: cdi weed ta eran ‘TeH TANSOT[OULeT seIe0A4eI I fe ol & pad Spee Ree, Meee 2 ie eee en eee ‘-greads ses0o 44th bY os AE es adet ghee aera tees --qPeR wUNAeITTMU) seI10949°TE AE VOTER, DECENT te anaes TeH wNyeNUIsHNUT svs9dAITG Bee ately ct has ace ed kak oe ce kan ae nie rina TRH esomqey ereu0jomMeTd a 52a) Poe Bak RY AD ee ae (pemmop) venue erarpavo1dsO ‘DIN DIT fore eee te es ees (eH) stumurur0o vreydounoy 4 o 006) 5,8 LR ante svete! ee eey aid ca 6s 9, Syn .01 6 a5Rye *(11@H) ST]I9X0 ele, dounoy + a0 ce eR ee Se oa eee Rw aN Oe See tee oe . ‘Teo mnyeqey euurdosr[ed ois ik ee, So be 8) he Dm Ne a lt me ben was a ‘OHIO STUIIOJIVUOT eVT]O SIO Sietieunyh, date mae Svein Sig Bee oligm SACO Ml eo ai i (1?) eqgenore VTTOISTIOTAL Ga hope gle vey kew eran 6. eRe ee et araie ela ew x . *(11®H) VAROUOD eooqio|douy feta, 60 ae Ne wa 6 at ES ae VA Ce a Ble eee “TeH 2424800 eardsoqyeu1o. I, ‘DIN Carta ee ie Tae we Bete ere i hth Sera eg (1reH) eSOqols errdsoqouAqy ave en ec aSUne ed esis are! s eat ene acu SLAW Whe Tipate ete (eH) ene 1qsor eunIisO oT "NI Teak Cyn, Cel Wiles Gon A eye eee, ele a, ee . “Teo snuujou0o seytuidg ‘EN Pye ke. OS, Wea Ai we el else bak mis ae ge. B . *(perm0p) sn.moe]doroeu sayradg BE A er atow (2 Wels Ny al Sci grind nt alts eas 6 oe ge 9m eae *(11e@H) e)e113sOpou ed £19 EF eR I ya ee ieee Ty [eH vorpurpéreu vpsovpessuey a tet THE DEVONIAN OF MISSOURI. 174 6T ZT Dalhousie formation ‘aN ‘OIs -noyq[eq St. Alban beds ‘gaqoned ‘edsex) Bois d’ Are limestone Haragan shale Decatur- ville chert “euney 044 Ul JUsSeIg = “AoSaef MON JO ‘puepAreyn jo AuUeysuO 943 Ul SMdO= “fF -°N “WO “PIN "10 ‘yIOX MON JO eSepuouG oY} UI SINdIO= ‘AO ‘yIOX MON JO 411s ol1eyoyIS oy} Ul smMoIO= *“H§ "yIOX MON JO AWeYSIIO 9} UL snaaG = a) “eTOISIT, TA 989M “erueatAsuuog ‘Aosior MON ‘pueyTAreyl UT SIMDIO= “A “M ““d “Cf 'N “PIN ‘(RTUISITA SOM IO eraeAyAsuueg ‘AOSIO£ MON JOJ WOATS SI 4F ‘puryArey, Ul Queseid Jou JI ‘pueyAIey JOJ pozeys: St 41 ose FOIA Ut ‘yuosord yOu ssoyuN ATWO YIOK MON JOJ WOATS ODMGIINIOO) YIOX MON Ul SMIIO= X “BIURATASUUOg PU VIUISITA ISOM ‘PULLAIeI ‘AosJof MON ‘HIOA MON = ore “PI-f£ ‘“N-"A “N i Oks | ies Pn | en | Mew eee Re rR Cae lye CI oege. aera Sig ase oe (souop) eonreApésuued epeuepscry Siac enn ee a ene ae oe eee (sero P) TILed BTeEnepoopsE a a acne eae a (seT/9M) sIsuaxcEsns epropsoly a0 =| § 3 a q jea| = » (5) 2 S| of £ ‘S fe 3 E z 7 “m01d01 Eales | 38 8 | os] 8 3 ‘PIN-'£ “N-"A “N 9) UT mo00 4k} Inq “OTT x © < eal A o a ‘eoIe YOOIO OUT[VE O[}4ITT Oy} Ul oMO}sSeUNT] ATE 94} Jo VUNRE Poarosqo oY} UT peyuaserdes you soroedgy eassouud,y, “"eore ‘PIN-f “N-"X “N “eulOyeLAO eee ‘ponutjuoO—FPr “ON ATAV i 175 BAILEY LIMESTONE. mt oD ms T CNN HHA ho ZT LT OWMWAMNE-W HMA MAN hin HA | OL LG LG LG ah & 0 OANA Dalhousie formation St. Alban beds ‘aN ‘aqend ‘aisnoyieq | ‘edsexy £ Li T G 0° 0 it Or 0 0 P Tt ¢ “S € G 9 GT le € 0 P OT 0G FI £ LI VS 9% GP O€ cP GE 6F zg ato i= 3 @ & © 2g Sa ye} 6 a Ses i “‘euloye yO on eProowenwtoono ville chert Decatur- NAN Nn a oe nok Hm rm 0 on m oo Birdsong shale “g0Ssouud,L, an AMONNMOONS il re aor new wu in| & 0 m oO op) st Olive Hill formation ‘qyeis9g pue pueT}OOg MON OY} 0} pougUoD une bitbaiwem ete Sats, ae tnbw. alle cnMindip ie tet. 0 leit) a ataies os pury -j00§ MON pue suUeUIAI0H oY) 0) poupU0D 5 IANS op ee SRS Cee MOR Cee qyes09g ot} 01 pougu0g ote par Ves eee puryjoog MeN oy) 0} pouguoD era “+++ +++ssuemrée09 ey} 09 peugu0g “yIO.K A Ra iege S aay ee eae AUCYSIIO 94} MOTEG JON | AON UL Mod00 9eq9 yng SIN ROSIE Soh b ihes eet hg qyeroog ey} eAoqy | “oy ‘vare yoord ouy ee Sit ties ens on ag Ae ce qyesoog ey} UT|-eg eT9ITT Ot} UI oMO4S Sere AON Wwe rte qr a Ck Ea Oi puepoos MONT em} Ur -9ull] AoTIeg eq} utr J0N Re APN Te ants soe A sueusa09 ot} Uy ose, Eee ape = yee (sl a,/eln as ‘oe suemAs0D eq} MOTOG vole “‘PIN-"f “N-"X ‘N OW} UE mov0 yeq9 9Nq “OJ ‘WOISe1 YOIID OUITeS O199IT O49 UL 9UOJseMT AoTIe_G 949 UI ION “OT ‘ROIe HII SUTLeS [441] OY} Ul oMOysomT] AoTIeg 94} UI M990 4eyAL CEA ARE caked GiEK Jeon csi AERC, SEALS eR se yIOK MON UT aN900 YeUL Bn Ge ee oe erry A ate oe Poss pare ‘PIN'f (N-"X “N 04} UL mMo00 4eTL aT aed eo ay MeO R Ce UWOIZEI IO 0929S OY} 09 P9z0II}sed YOU e1e YeULL ‘soreds pourmisjop jo 1oquinyy SON WTEVL 176 THE DEVONIAN OF MISSOURI. DESCRIPTION OF SPECIES. Porifera Class SPONGIAE Order Lithistida, Suborder Eutaxicladina Genus Hindia Duncan Hindia fibrosa (Roemer)! 2S ise Ml aeen epee deal Clamopora fibrosa F. Roemer (not Goldfuss), 1860, Sil. Fauna des Westl. Tenn., p. 20, pl. Il, figs2; Astylospongia inornata Hall, 1863, 16th Ann. Rept. N. Y. State Cab. Nat. Hist., p. 70. Hindia sphaeroidalis Duncan, 1879, Ann. & Mag. Nat. Hist., ser. V, vol. IV, p. 84, pl. IX. -Hindia fibrosa Hinde, 1883, Cat. Foss. Sponges.Brit. Mus.,:p. 57, pl. XIII, fig. 1. Hindia sphaeroidalis Rauff, 1894, Palaeospongiologie, pt. 1, p. 335, pls. 15-17, figs. 1-4,? , Hindia sphaeroidalis Girty, 1899, U.S. Geol. Surv., 19th Ann. Rept., pt. III, p. 552. .-Hindia fibrosa Weller, 1903, Pal. N. J., vol. III, p. 297, pl. XXXII, figs. 1, 2. Hindia fibrosa Clarke, 1908, N. Y. State Mus., mem. 9, pt. 1, p. 116. ' Hindia fibrosa Clarke, 1909, N. Y. State Mus., mem. 9, pt. 2, p. 50. Hindia spiaeroidalis Swartz, 1913, Md. Geol. Surv., L. Dev., p. 195, pl. XVII, figs. 1-4. Description—‘‘Spherical, consisting of minute spicules uniting to form a series of delicate, straight canals which radiate from the center of the sponge and increase by bifurcation. The canals open upon the surface by polygonal orifices. The minute struc- ‘ture of this species was worked out by Rauff, and subsequently discussed critically by Hinde, Ulrich and Girty. ‘“‘Rauff showed that it consists of spicules, each of which bears 4 rays which diverge from a common center. Three of the rays are stout, slightly curved, concave on the inner side denticulate on the outer side and have expanded denticulate extremities. The fourth ray is small and directed towards the exterior. It is often abortive. The ° whole structure consists of superimposed series of these spicules. The manner in which they unite to form the cancals is illustrated diagrammatically in fig. 3 [p. 196]. Three spicules, whose centers form the angles of the cell, lie on one level while three alter- nating spicules, whose centers are dotted in the diagram, lie at a slightly higher level in the structure, their rays descending obliquely upon the rays of the first set, the third layer repeating the first, etc. In this manner walls are built up around the canals which are perforated by openings, placing the interior of the adjacent canals in communication. The form of an individual spicule and the manner in which it articulates with its neigh- bors is shown in fig. 4 [p. 196] while the manner in which they unite to form the walls of the canal is shown in fig. 5 [p. 197]. Excellently preserved specimens showing the inner structure are found at Keyser, West Virginia. ~ “Position of the genus has been much discussed. Steinmann regarded it as a form of Favosites. Rauff determined its true character, showing that it is a sponge and regarded it as one of the siliceous sponges. “Diameter of spheres, 25 mm. or at times a little greater. They are frequently somewhat distorted by compression.’’—Swartz, 1913. Dimensions—Mean diameter of sponges 7.8 to about 48 mm, - 1See Clarke, J. M., N. Y. State Mus., Mem. 9, pt. 2, pp 50-51, 1909. :For additional references through 1895, see Md. Geol. Surv., L. Dev., p. 195. ANTHOZOA. Li, COELENTERATA Class ANTHOZOA Subclass Tetracoralla Family Zaphrentidae Genus Streptelasma Hall Streptelasma strictum Hall Plate 40, figures 5-11 Streptelasma (Petraia) stricta Hall, 1874, 26th Ann. Rept. N. Y. State Mus. Nat. Hist., p. 114. Streptelasma stricta Hail, 1879, 32nd Ann. Rept. N. Y. State Mus. Nat. Hist., p. 142. Streptelasma strictum Hall, 1883, Rept. State Geol. N. Y. for 1882, pl. I, figs. 1-10. Streptelasma strictum Hall, 1887, Pal. N. Y., vol. VI, p. 1, pl. I, figs. 1-10. Streptelasma strictum Girty, 1895, 48th Ann. Rept. N. Y. State Mus. Nat. Hist., vol. II p. 300. Enterolasma strictum Simpson, 1900, N. Y. State Mus., Bull. 39, p. 203, figs. 11, 12 (p. 204). Streptelasma strictum Weller, 1903,-Pal. N. J., vol. III, p. 298; pl. XXXII], figs. 3, 4. Enterolasma (Streptelasma) strictum Shimer, 1905, N. Y. State Mus., Bull. 80, p. 235. Streptelasma strictum Swartz, 1913, Md. Geol. Surv., L. Dev., p. 198, pl. XVII, figs. 5-9. _ _Description—‘‘Corallum simple, conicai, very gradually and regularly enlarging; straight or very slightly curved, except at the apex, which is sometimes more abruptly bent. Exterior marked with strong undulations of growth and numerous fine concentric striae; external rays very prominent, from forty-five to fifty at a point where the diameter of the corallum is 15 mm.; the increase in number taking place peaey at three distinct points, but sometimes at ate two “Calix deep, sides thin and nearly erect; a flat space at the bottom. In one calix, having a diameter of 20 mm., there are fifty-four lamellae; alternate lamellae extending only a short distance from the walls at the base of the calix and frequently coalescing with the primary lamellae. For some distance below the calix-margin the lamellae are of the same size, their edges smooth and rounded, becoming sharp below, and their sides often distinctly granulose or spinulose. The primary lamellae unite and coalesce at the center of the calix, forming an indistinct plate or vesiculose core from 3 to 5 mm, in diameter. Fossette obscure or obsolete.’’—Hall, 1887. Dimensions—Figured specimens indicate range in size of coralla. Subclass Tabulata Family Favositidae Genus Favosites Lamarck Favosites helderbergiae Hall Plate 40, figures 12-17; plate 41, figure 1 . ' Favosites helderbergiae Hall, 1874, 26th Ann. Rept. N. Y. State Mus, Nat. Hist., p. 111, Favosites helderbergiae Hall, 1879, 32nd Ann. Rept. N. Y. State Mus, Nat. Hist., p. 145.~ ’ Favosites helderbergiae Hall, 1883, Rept. State Geol. N. Y. for 1882, pl. IV, figs. 1, 2; pl. V, figs. 1-3; pl. VI, figs. 1-8. Favosites helderbergiae Hall, 1887, Pal. N. Y., vol. VI, p. 8, pl. IV, figs. 1, 2; pl. V, figs. 1-3; pl. VI, figs. 1-8. 178 THE DEVONIAN OF MISSOURI. Favosites helderbergiae Girty, 1895, 48th Ann. Rept. N. Y. State Mus. Nat. Hist., vol. HM, pl.-302, ; Favosites heldevbergiae Weller, 1903, Pal. N. J., vol. III, p. 270. Favosites helderbergiae Shimer, 1905, N. Y. State Mus., Bull. 80, p. 235. Favosites helderbergiae Clarke, 1908, N. Y. State Mus., mem. 9, pt. 1, pp. 113, 218. Favosites helderbergiae Clarke, 1909, N. Y. State Mus., mem. 9, pt. 2, p. 49. Favosites helderbergiae Grabau and Shimer, 1909, N. Am. Index Foss., vol. I, p. 85, fig. 138. Favosites helderbergiae Swartz, 1913, Md. Geol. Surv., L. Dev., p. 208, pl. XXII, fig. 1. Description—‘‘Corallum consisting of large, lenticular, depressed convex or hemis- pherical masses; base covered by a strongly wrinkled epitheca. Cell tubes polygonal; their inner surface showing evidence of a few strong longitudinal striae. Septa frequent, from ten to fifteen in the space of 10 mm.; thickness equal to that of the cell walls. Mural pores in one or two ranges, comparatively large, circular, with margins distinctly ele- vated. Cell walls thin, but frequently much thickened near the syrface by silicification, and sometimes granulose or spinulose on the inner face. On some specimens the cells, at the surface, are nearly equal, having a diameter of about 1.5 mm.; on other speci- mens the diameter varies from .66 mm. to 1.5 mm. “On many specimens some of the cell tubes are larger and less angular than those surrounding them, being a little more than 2 mm. in diameter. A single specimen from Coeymans Landing has slightly larger tubes on one portion, while on all the other parts the cells have the ordinary characters.’’—Hall, 1887. Dimensions—Figured specimens indicate variation in size of coralla. Range in greatest internal diameter of corallites of the various specimens about 0.25 to 2.25 mm.; maximum range for any one specimen 0.7 to 2.25 mm. Remarks—The specimens represent coralla of various shapes. Hall figures a specimen of F. helderbergiae from New York ‘‘which differs from the prevailing specimens in having numerous and somewhat regularly distributed larger cells which are subcircular at their apertures.’’! This character prevails among the Missouri specimens. The arrangement of the tabulae is accurately determinable only on portions of two of the specimens. The disposition of the mural pores is accurately determinable, and the septal spines are observable (to the unaided eye) on portions of all of the specimens. Two of the specimens show epitheca. Favosites conicus Hall Plate 41, figures 2-7 ; Favosites conica Hall, 1874, 26th Ann. Rept. N. Y. State Mus. Nat. Hist., p. 112. Favosites conica Hall 1879, 32nd Ann. Rept. N. Y. State Mus. Nat. Hist., p. 146. Favosttes conicus Hall, 1883, Rept. State Geol. N. Y. for 1882, pl. III, figs. 4, 6-13. Favosites conicus Hall, 1887, Pal. N. Y., vol. VI, p. 9, pl. III, figs. 4, 6-13. Favosites conicus Girty, 1895, 48th Ann. Rept. N. Y. State Mus. Nat. Hist., vol. II, p. 302. ; Favosites conicus Girty, 1899, U. S. Geol. Surv., 19th Ann. Rept., pt. III, p. 560. Favosites conicus Swartz, 1913, Md. Geol. Surv., L. Dev., p. 212, pl. XXIII, figs. 5-7. Description—‘‘Corallum forming conical. masses; flattened at the base, which is covered by a strong epitheca, marked with concentric wrinkles and undulations and ' radiating undulations formed by the cell tubes. Cells arising from the center of the base and from an undefined central axis and quite abruptly curving to the surface, increasing by interstitial additions; polygonal, from four to eight-sided; diameter at the surface varying from 1.5 to 3.5 mm.; walls comparatively strong; interior with evidences of numerous spinules or small nodes. Tabulae of about the same strength as the walls, 1Pal. N.Y... vol. Vispli Vij few lssve a ANTHOZOA. 179 irregularly arranged, varying from eight to fifteen in the space of 10 mm. Mural pores comparatively large, circular, with distinctly elevated margins, disposed in one, two and sometimes three ranges. Where one or two ranges occur the pores are regularly arranged one above the other; where three ranges occur the disposition is more irregu- lar.”’—Hall, 1887. Dimensions—Variation in size of coralla indicated by specimens figured. Range in greatest internal diameter of corallites of the various specimens and maximum range for any one specimen 0.8 to 3.5 mm. Remarks—The arrangement of the tabulae is accurately determinable on portions of part of the specimens. The disposition of the mural pores is accurately determinable, and the septal spines are observable (to the unaided eye) on portions of all of the speci- mens. Epitheca is shown on all of the specimens. Genus Striatopora Hall Striatopora missouriensis Meek and Worthen? Plate 42, figures 1-4 Striatopora missouriensis Meek and Worthen, 1868, Ill. Geol. Surv., vol. III, pl. 369, pl. 7, fig. 4. Striatopora missouriensis Keyes, 1894, Mo. Geol. Surv., vol. IV, pt. I, p. 121. Description—‘‘Corallum slender, ramose; branches cylindrical; cells obfiquely ascending from an imaginary axis, rather distantly separated, slender and rounded with- in, but enlarging and curving outwards to the surface, where they terminate in com- paratively large, transversely oval, or subrhombic mouths, alternately arranged, and directed more or less obliquely upwards, with a sharp, rather prominent lip below; striae distinct, ascending from each cell, and continued up the upper side of the en- larged opening, to the lower margins of the succeeding openings above. “Length unknown; diameter of an imperfect branch, about 0.20 inch.’—Meek and Worthen, 1868. Remarks—Meek and Worthen’s figure of S. missouriensts is too poor to permit more than doubtful reference of the material at hand to this species from the Helderbergian of Missouri. The specimens might be assigned to S. issa. Halll. A description of the material at hand follows: Corallum ramose, composed of closely united corallites (whose orifices are polygonal and unequal in diameter) which ascend obliquely from axis, rapidly increase in size, and end obliquely upon surface. Calyces funnel-shaped, sides marked by prominent longitidinal ridges that produce crenulation of thin calyx-edges, walls pierced by comparatively large mural pores. Mean diameter of brariches 6.5 to 15.0mm. Range in greatest diameter of corallites of the various specimens, and maximum range for any one specimen 1.0 to 4.0 mm. The specimens differ from S. bella Swartz in that the calyces narrow more rapidly downward and the calyx-ridges are more prominent. Striatopora bella Swartz Plate 42, figures 5-8 Striatopora bella Swartz, 1913, Md. Geol. Surv., L. Dev., p. 215, pl. XXV, figs. 1, 2. Description—"Corallum branching, dendroid, consisting of closely united prismatic corallites which ascend along axis and then bend abruptly, terminating obliquely upon surface; corallites quite unequal in diameter, more or less irregular in cross-section. Calyx funnel-shaped, its base formed by a broad, flat tabula, its sides striated by twelve low ridges, its edges thin and slightly crenulated.by the termination of the ridges. Walls of calyx perforated by large scattered pores. An occasional pore is seen to pierce the tabulae in the single specimen observed. 126th Ann. Rept. N. Y. State Mus. Nat. Hist., p. 114, 1874. 180 THE DEVONIAN OF MISSOURI. “Diameter of corallum 5to 10mm. Diameter of orifices varying with maturity of corallite from 1 to 2.5 mm. “This species differs from S, issa Hall in its less conical calyx with less prominent furrows. It differs from S. cavernosa Rom. which has more funnel-like calyces with obtuse edges.”—Swartz, 1913. Dimensions—Mean diameter of branches 6.5 to about 13.5 mm. Range in greatest diameter of corallites of the various specimens, and maximum range for any one speci- men 0.8 to 3.5 mm. Genus Pleurodictyum Goldfuss Pleurodictyum lenticulare (Hall) ? Plate 42, figure 9 Michelinia lenticularis Hall, 1874, 26th Ann. Rept. N. Y. State Mus. Nat. Hist. p. 113. Michelinia lenticularis Hall, 1879, 32nd Ann. Rept. N. Y. State Mus, Nat. Hist. p. 145. Michelinia lenticularis Hall, 1883, Rept. State Geol. N. Y. for 1882, pl. III, figs. 1-3, 5. Michelinia lenticularis Hall, 1887, Pal. N. Y., vol. VI, p. 7, pl. III, figs. 1-3, 5. Pleurodictyum lenticulare Beecher, 1891, Trans. Conn., Acad. vol. VIII, p. 207. Pleurodictyum lenticulare Girty, 1895, 48th Ann. Rept. N. Y. State Mus. Nat. Hist., vol, II, p. 305. Pleurodictyum lenticulare Swartz, 1913, Md. Geol. Surv., L. Dev., p. 218, pl. XXVI, fig. 1. Description—‘‘Corallum forming small lenticular bodies, the lower surface usually the less convex and covered with a strongly wrinkled epitheca. Cells large and few, usually from seven to twelve; broadly campanulate. Partition walls about 1 mm. thick; strongly marked longitudinally by nodose striations; denticulate on the margins. The number of striations and denticulations varies with the size of the cell. “In a characteristic specimen 20 mm. in diameter, there are eight cells, the central one having a diameter of 11 mm., and the peripheral cells measuring from 6 to 8 mm. ‘across. The entire height of this specimen is 9 mm. ‘“‘TRemarks|—This is a very small species, seldom attaining a diameter, of more than 25 mm., and is distinguished by its large cells and their strongly granulose-striate character. A small individual 10 mm. in diameter shows one large central cell and six smaller ones around the margin, also an incipient seventh cell. Occasionally there are two central cells in large individuals, and the number of peripheral cells in such speci- mens is from ten to twelve.’’—Hall, 1887. Dimensions—Diameter of corallum undeterminable. Remarks—On a fragment of rock are two detached groups of corallites which probably are parts of one corallum; one group shows portions of nine corallites, the other of four corallites. The nature of the base of the corallum represented is unde- terminable. ECHINODERMATA | Class CRINOIDEA Order Camerata Family Melocrinidae Genus Scyphocrinus Zenker Scyphocrinus sp. Plate 42, figure 10; platé 43, figures 1-6 Description—This genus is represented by several parts of calyces and root-bulbs that are provisionally regarded as of a single species.! ‘The “‘inflated or bulbous root’’ of Scyphocrinus was described as Camarocrinus by Hall and as Lobolithus by Barrande. See von Zittel’s Text-book of Pal., vol. I, pp. 160 and 190, 1913. : BRYOZOA. 181 Dimensions—Specimens figured indicate range in size of calycés. Greatest trans- verse diameter of root-bulbs about 35 to about 130 mm. Order Inadunata Suborder Fistulata Family Poteriocrinidae Genus Alsopocrinus n. g. Description—Dorsal cup obconic. Infrabasals three, affected by disk-like depres- sion for reception of column. Radials with straight facet and transverse ridge. Radianal rests upon one face of posterior basal and one face of right posterior basal. Anal un- known, in line with radials. Tegmen, arms and column unknown. Remarks—This genus and the following species are founded upon a single, in- complete dorsal cup. The character of the facet, and the ‘transverse ridge is determinable only on the anterior, right anterior, and left posterior radials. Alsopocrinus anna n, sp. Plate 44, figures 4-6 Description—Dorsal cup obconic. Infrabasals three, affected by disk-like depres- sion for reception of column, extend beyond periphery of column; two pentagonal, with truncate distal margins; one that lies in part below posterior basal and in part below right posterior basal smaller, quadrangular, with angular distal margin. Basals, pos- terior and right posterior ones hexagonal, others pentagonal. Radials with straight facet and transverse ridge,’ four pentagonal, shape of right posterior one unknown. Radianal rests upon one face of posterior basal and one face of right posterior basal. Anal unknown, in line with radials. Tegmen, arms and column unknown. Dimensions—Dorsal cup: Height 6.0 mm., proximal diameter 3.25 mm., distal diameter about 8.0 mm. Remarks—The shape of the anal, Tee ial. and right posterior radial are unde- terminable because the anal is missing, and the radianal and right posterior radial are incomplete. Genus Edriocrinus Hall Edriocrinus ? sp. Plate 44, figures 1-3 | Description—A portion of a calyx is doubtfully referred to this genas. MOLLUSCOIDEA Class BRYOZOA Order Cyclostomata Suborder Ceramoporoidea Family Fistuliporidae Genus Fistulipora M’Coy Fistulipora ? sp. Plate 44, figure 7 Description—A silicified portion of a zoarium is doubtfully referred to this genus. 1See remarks under Alsopocrinus n. g. 182 THE DEVONIAN OF MISSOURI. Order Cryptostomata Family Fenestellidae Genus Fenestella Lonsdale Fenestella ? sp. Plate 44, figure 8 Description—The specimen is a silicified fragment of a zoarium which shows only the non-celluliferous surface. CLASS BRACHIOPODA: Order Neotremata Superfamily Craniacea Family Craniidae Genus: Crania Betzius Crania alsopi n. sp. Plate 44, figures 9-11 Description—Dorsal valve prominently elevated; surface ornamented with radiat- ing costae, that increase toward margin, crossed by concentric growth lines. One speci- men with diameter of about 7 mm. has about 112 radiating costae at margin. Remarks—The relation between the diameter of the dorsal valve and the number of radiating costae is determinable on but one of the two specimens (attached to a specimen of Meristella atoka) observed. Order Protremata Sub Orthacea Family Orthidae Genus Dalmanella Hall and Clarke Dalmanella planocenvexa (Hall) Plate 44, figures 12-17 Orthis planoconvexa Hall, 1859, Pal. N. Y., vol. III, p. 168, pl. XII, figs. 1-6, 1861. Dalmanella planocenvexa Hall and Clarke, 1892, Pal. N. Y., vol. VIII, pt. 1, pp. 207, 224, Daimanella planoconvexa Clarke, 1909, N. Y. State Mus., mem. 9, pt. 2, p. 145° Dalmanella planiconvexa Schuchert, 1913, Md. Geol. Surv., L. Dev., p. 298, pl. LIV, figs. 1-6. Description-—‘‘Shell plano-convex; outline somewhat circular or transversely oval; length and breadth about as ten to twelve. Dorsal valve nearly flat, slightly prominent near the beak on either side of the faint central depression, and quite flat towards the margins. Ventral valve convex, sometimes scarcely subangular towards the beak; greatest convexity a little above the middle of the shell, and thence sloping uniformly to the lateral and basal margins; beak small, acute, incurved. Area linear, its length 1For each species, the range in size of the shells is indicated by the figured specimens. a ee aaa . BRACHIOPODA. 183 greater than half the width of the shell. Striae fasciculate, much curved upwards to- wards the cardinal and lateral margins. “i [Remarks] * * * * * * a = In the dorsal valve the lamellae bordering the muscular areas which diverge abruptly, and then becoming almost obsolete, curve so as to enclose a broad oval space with a depressed line through the center * * In the ventral valve the lamellae are broadly divergent and, becoming gradually obsolete, are nearly lost and leave scarcely an impression in the cast. The imprint of the adductor muscles forms a small scar towards the upper part of the vascular area * = * . - * oY Raa bei Dalmanella perelegans (Hall) Plate 44, figures 18-26 é Orthis perelegans Hall, 1857,10th Ann. Rept. N. Y. State Cab. Nat. Hist. p. 44, fig. 1. Orthis perelegans Hall, 1859, Pal. N. Y., vol. III p. 171, pl. XIII, figs. 4-12, 1861. Orthts perelegans Hall, 1883, Rept. State Geol. N. Y. for 1882, pl. XX XV figs. 32, 33. Dalmanella perelegans Hall and Clarke, 1892, Pal. N. Y., vol. VIII, pt. I, pp. 207, 224, pl. VC, figs. 34, 35. Dalmanella perelegans Clarke, 1900, N. Y. State Mus., mem. 3, p. 57. Dalmanella perelegans Weller, 1903, Pal. N. J., vol. III, pp. 305, 327, pl. XX XV, figs. 5-8. Dalmanella perelegans Shimer, 1905, N. Y. State Mus., Bull. 80, p. 243. Dalmanella perelegans Schuchert, 1913, Md. Geol. Surv., L. Dev., p. rae pl. LIV, figs. 14-23. Dalmanella perelegans Dunbar, 1919, Tenn. Geol. Surv., Bull. 21, pl. “4 fig. 9. _ Description—‘‘Shell transversely oval; valves nearly equally convex. Dorsal valve subventricose, more or less depressed along the middle from near the beak to the front; beak small little elevated above the hinge line. Ventral valve elevated along the middle from the beak towards the front and sloping laterally; beak small, pointed, incurved, extending beyond that of the opposite valve. Cardinal margin generally sloping a little from the beaks, and rounding imperceptibly into the lateral margins. Area narrow, nearly half as long as the width of the shell. Foramen broad triangular, extending nearly to the apex of the beak. Surface marked by fine irregular bifurcating longitudinal striae, crossed by concentric lines of growth. ““T Remarks] ‘5 - The ventral valve, although strongly elevated in the centre towards the beak, is not subcarinate 7 ss and this gibbosity is lost before reaching the base. Along the middle of the dorsal valve there is a broad unde- fined depression, which is more conspicuous in the upper part, from the beak half way to the base; below which point, it becomes scarcely marked as a distinguishing character of the shell 53 * . The striae of this species are often fasciculate; the stronger ~ ones separated by three, four, five or six smaller ones * = ¥ * 4S * “ - * —Hall, 1859. Dalmanella quadrans (Hall) Plate 44, figures 27-31 _ Orthis“quadrans Hall, 1859, Pal. N. Y., vol. III, p. 170, pl. XII, figs. 9-12, 1861. Dalmanella quadrans Hall and Clarke, 1892, Pal. N. Y., vol. VIII, pt. I, p. 224. Description—Shell subquadrangular, valves unequally convex, anterior border emarginate, anterior line of junction of valves sinuate. Ventral valve more convex than dorsal valve, most convex in middle, with prominent mesial elevation from beak nearly, or quite, to anterior margin; beak conspicuous, incurved. Cardinal area about 3 width of shell, delthyrium comparatively large. Dorsal valve with pronounced mesial depression from beak to anterior margin; beak inconspicuous, incurved. Surface orna- mented with radiating, bifurcating, fasciculate costae—4 to 5 in 1 mm. at anterior border—crossed by concentric growth lines. 184 THE DEVONIAN .OF MISSOURI. Family Rhipidomellidae ° Genus Rhipidomella Oehlert | Rhipidomella oblata (Hall) Plate 44, figures 32, 33; plate 45, figures 1-8 Orthis oblata Hall, 1857, 10th Ann. Rept. N. Y. State Cab. Nat. Hist., p. 41, figs. 1-5 Orthis oblata Hall, 1859, Pal. N. Y., vol. III, p. 162, pl. X, figs. 1-17, 19-22, 1861. Orthis oblata Whitfield, 1882, Geol. Wis., vol. IV, p. 320, pl. 25, figs. 1, 2. Rhipidomella oblata Hall and Clarke, 1892, Pal. N. J., vol. VIII, pt. I, pp. 210, 225, pl. Via, figs. 3, 4. Rhipidomella oblata Girty, 1899, U. S. Geol. Surv., 19th Ann. Rept. 5 Sy III, p. 562, pl. LXX, fig. 3a. Rhipidomella oblata irks: 1900, N. Y. State Mus., mem. 3, p. 58, pl. 8, figs. 14, 15. Rhipidomella oblata Weller, 1903, Pal. N. J., vol. III, pp. 304, 350, pl. XX XV, figs. 9-13; pl. XLVI, figs. 5-7. Rhipidomella oblata Shimer, 1905, N. Y. State Mus., Bull. 80, p. 244. Rhipidomella oblata Schuchert, 1913, Md. Geol. Surv., L. Dev., p. 303, pl. LV, figs. 9-16 Rhipidomella oblata Dunbar, 1919, Tenn. Geol. Surv., Bull. 21, pl. I, fig. 1. Descriptton—‘‘Shell in the young state longitudinally subovate, and varying from circular to transversely oval in its stages of growth, resupinate. Ventral valve convex © at the beak, flatteged in the middle, and concave towards the front. Dorsal valve very convex in the middle and towards the beak; beaks of the two valves nearly equally elevated; that of the ventral valve pointed; area very small; foramen large. Surface finely striated; striae frequently bifurcating and curving towards the lateral and cardinal “margins, concentrically marked by finer striae and stronger lines of growth, which are ~ numerous in the older shells. “Internally the ventral vaive is marked by a large foliate vascular impression; impressions of the adductor muscles rarely well preserved, except in the casts. Teeth _ prominent, and, when entire, rounded and thickened at their extremities. Dorsal valve with a prominent cardinal process and divergent brachial lamellae; a central ridge, more or less prominent, extends from beneath the beak to near the base. “TRemarks | ‘5 * The ventral valve is marked by a broad undefined depression down the centre, making the entire valve broadly concave from a little below the beak, and producing a sinuous outline in front. The dorsal valve maintains a gener- ally uniform convexity, its greatest height being towards the beak, “Tn young and half-grown shells the length and height are nearly equal, while in older pera the propartions of length and breadth ane. often as three to four * * . * Hall, 1859. Remarks—In the case of the observed specimens, either the convexity of the dorsal valve is uninterrupted, or the valve i is slightly flattened, medially, from oe beak to the anterior margin, Rhipidomella discus (Hall) ° Plate 45, figures 9-16 Orthis discus Hall, 1859, Pal. N. Y., vol. III, p. 165, pl. Xa, figs 7-12, 1861, Rhipidomella discus Hall and Clarke, 1892, Pal. N. Y., vol. VIII, pt. I, pp: 210, 225. Descripltion—“‘Shell circular; valves moderately and nearly equally convex. Dorsal valve flattened or slightly depressed in the centre near the beak, the depression becoming broader and undefined below the middle of the shell, Ventral valve regularly convex, . becoming flattened towards the lateral and basal margins, sometimes a little eleyated i in . the middle. Area narrow; length peseets to or greater than half. the. width of t the. shell., BRACHIOPODA. 185 Foramen large, usually filled with the trifid cardinal process. Surface finely striated; striae somewhat in fascicles, abruptly bending upwards towards the hinge line. Ventral valve with a small vascular impression.’’—Hall, 1859. Rhipidomella ellsworthi n. sp. Plate 45, figures 17-39, Orthis hybrida? Meek and Worthen, 1868, [ll. Geol. Surv., vol. III, p. 371, pl. 7, figs. 7a-d. - 5 Description—Shell subquadrangular to transversely suboval in outline, valves about equally convex, anterior border uninterrupted to emarginate, anterior line of junction of valves straight to sinuate. Dorsal valve marked, medially, from beak to front by a distinct, rounded depression flanked on each side by a distinct, rounded ridge; beak inconspicuous, incurved. Ventral valve most convex posterior to middle; either marked, medially, from beak toward, or to, anterior margin by an indistinct, rounded ridge bordered on each side by an indistinct, rounded depression—ridge corresponds in posi- tion with depression in dorsal valve, and depressions correspond with ridges on dorsal valve, or marked, medially, from anterior margin posteriorly by a shallow depression whose width at anterior margin approximates distance between apices of ridges of dorsal valve at anterior border; beak prominent, incurved. Length of cardinal area half to less than half width of shell, delthyrium comparatively large. Surface ornamented by radiating costae—3 to 4 in 1 mm. at anterior border—that increase by bifurcation, crossed by concentric growth lines. Remarks—This species‘most closely resembles R. discus (Hall). Meek and Worthen’s material was obtained from the Bailey limestone at Bailey’s Landing, Perry County, Missouri. Rhipidomella melvillet n. sp. -Plate 46, figures 1-17 Description—Shell subpentagonal in outline, valves about equally convex, anterior line of junction of valves straight to sinuate. Ventral valve most convex posterior to middle; convexity of valve uninterrupted, or valve flattened, or shaliowly depressed, medially, from anterior margin posteriorly; beak prominent, incurved over that of dorsal valve. Dorsal valve flattened, or shallowly depressed, medially, from beak toward, or to, anterior margin; beak inconspicuous, incurved. Cardinal area equal to or greater than half width of shell, delthyrium relatively large. Surface marked by radiating costae—4'in 1 mm. at anterior margin—that increase by bifurcation, crossed by con- centric lines of growth. Remarks—This species is quite distinct. Genus Bilobites Linn Bilobites varica (Conrad) Plate 46, figures 18-25 Delthyris bilobata Conrad (not Orthis bilobata Sowerby), 1838, 2nd Ann. Rept. N. Y. Geol. Surv., pp. 112, 118. Delthyris varica Conrad, 1842, Jour. Acad. Nat. Sci., Philadelphia, vol. VIII, p. 262, pl., 14 fig. 20. ; . Orthis varica, Hall 1859, Pal. N. Y., vol. III, p. 179, pl. XXIV, figs. 1a-i, k, 1861. Orthts (Dicoelosia) varica Hall, 1883, Rept. State Geol. N. Y. for 1882, pl. XXXV, figs. 38-40. 186 ‘-THE DEVONIAN OF MISSOURI. Bilobites varicus Beecher, 1891, Am. Jour. Sci., 3rd ser., vol. XLII, p. 52, pl. I, figs. 3-27. Bilobites varcius Hall and Clarke, 1892, Pal. N. Y., vol. VIII, Pt. I, pp. 204, 205, 223, pl. Vb figs. 15-19. Bilobites varica Weller 1903, Pal. N. J., vol. III, p. 306, pl. XXXYV, figs. 14-18. Bilobites varicus Dunbar, 1919, Tenn. Geol. Surv., Bull. 21, pl. 2, fig. 4. Description—‘‘Shell subcordiform ventricose, deeply bilobed at the base, with a deep sulcus upon each valve reaching to the beaks; hinge line short. Area common to both valves; that of the ventral valve higher. Foramen high and narrow. Ventral valve acuate, ventricose on each:side of the sinus. Dorsal valve gibbous on éach side the mesial sinus; each lobe becoming angular towards the beak, and compressed toward the cardinal extremities. Surface unequally striated; a few distant striae being visible to the naked eye, while under a lens the interspaces are seen to be distinctly striated. Fine concentric striae cross the radiating striae, and become conspicuous towards the base of the shell.’’—Hall, 1859. Superfamily Strophomenacea Family Strophomenidae Genus Leptaena Dalman Leptaena rhomboidalis (Wilckens) ‘ Plate 46, figures 26- 32 Conchita rhomboidals Wilckens, 1769, Nachricht von selten Nbc Satedaee ony A pl. VIII, figs. 43, 44. Strophomena rugosa Hall, 1859, Pal. N. Y. vol. III, p. 195, pl. XIX, figs. la-y, 1861. Leptaena rhomboidalis Hall and Clarke, 1892, Pal. N. Y., vol.. VIII, pt. I p. 279, pl. VIII figs. 17-31; pl. XVa, figs. 40-42; pl. XX, figs. 21-24. Plectambonites rhomboidalis Keyes, 1894, Mo. Geol. Surv., vol. V, p. 70, pl. XX XIX, fig. 6.1 Leptaena rhomboidalis Girty, 1899, U. S. Geol. Surv., 19th Ann. Rept., pt. III, p. 563. Leptaena rhomboidalis Clarke, 1900, N. Y. State Mus., mem. 3, p. 57. Leptaena rhomboidalis Weller, 1903, Pal. N. J., vol. III, pp. 278, 302, pl. XXVII, fiz. 9 pl. XXXIITI, fig. 10. Leptaena rhomboidahs Shimer, 1905, N. Y. State Mus., Bull. 80, p. 240. Leptaena rhomboidalis Clarke, 1908. N. Y. State Mus., mem. 9, pt. 1, pp. 111, 116, 183, pl. 34, figs. 1-3. Leptaena rhomboidalis Clarke, 1909, N. Y. State Mus., mem. 9, pt. 2, pp. 45, 122, pl. 10, figs. 1-6. Laptaena rhomboidalis Maynard, 1913, Md. Geol. Surv., L. Dev., p. 308, pl. LVI, figs. 13-17. Laptaena rhomboidalis Dunbar, 1919, Tenn. Geol. Surv., Bull. 21, pl. 2, fig. 17. Description—‘‘Shell varying from semioval to semicircular. Hinge line equalling or greater than the width of the shell below; cardinal extremities often much extended. Dorsal valve flat or slightly concave in the upper part, and abruptly curving or inflated towards the front; beak prominent, perforate at its apex, and filling a deep sinus in the opposite valve. Ventral valve slightly convex or nearly flat in its upper part, and some- times even concave; convex upon the umbo, often perforate near the beak; abruptly deflected or geniculate towards the front; cardinal area narrow, linear, partially occupy- ing both valves. Foramen of the ventral valve a broad, shallow sinus, which is filled by the prominent cardinal process of the opposite valve, the latter being perforate or 1For complete bibliography to 1897, see Schuchert, C., U. S. Geol. Surv., Bull 87 p 24°, 1897, _BRACHIOPODA. 187 deeply grooved for the passage of a pedicle. Surface marked by regular, rounded, radi- ating striae, which increase by bifurcation and interstitial addition; the upper part of the valves marked by strong concentric wrinkles which do not extend below the abrupt bending of the valves. “The interior of the shell is striato-punctate, or sometimes simply punctate. The muscular areas of the ventral valve are strong, more or less deeply bilobed, and limited by the extension of the dental lamellae. The interior of the dorsal valve is strongly marked by the muscular impressions; the dental process perforate near its outer surface, or deeply grooved; and there is often a deep cavity below this, extending towards the beak. “Remarks |—This shell exhibits much variety of form, being sometimes nearly flat or but slightly curved near the margin; and the corrugations are variable in number and strength. In very old shells they are often not as prominent as in younger ones, or those of medium size. The area, as usually exposed, is subject to much variation, and not unfrequently the valves are so closed as to leave no visible area. The beak of the dorsal valve, either at or just within its extremity, shows a rounded perforation or groove; and the beak of the opposite valve is marked by a rounded, shallow groove, which, extending downwards, often ends in a perforation both in young and old shells. Some-, times the groove only is visible, the perforation having doubtless once existed, but sub- sequently closed. In some specimens there is a simple indentation on the beak’’—Hall 1859. Genus Stropheodonta Hall Stropheodonta arata (Hall) Plate 46, figures 33-35 Strophodonta varistriata var. arata Hall, 1859, Pal. N. Y., vol. III, p. 183, pl. XVIII, figs. la-i, 1861. Strophodonta varistriata var. arata Hall, 1883, Rept. State Geol. N. Y. for 1882, pl. XLIV, figs. 17, 18. Stropheodonta varistriata var. arata Hall and Clarke, 1892, Pal. N. Y., vol. VILI, pt. I, . pl. XIII, figs. 17, 18. Stropheodonta varistriata var. arata Weller, 1903, Pal. N. J., vol. III, p. 275, pl. XXVII, fig. 3. Stropheodonta varistriata var. arata Shimer, 1905, N. Y. State Mus., Bull. 80, p. 241. Stropheodonta arata Schuchert, 1913, Md. Geol. Surv., L. Dev., p. 311, pl. LVII, figs. 7-10. Description—‘‘Shell semi-elliptical, with the cardinal extremities more or less salient; hinge crenulate. Dorsal valve more or less concave. Ventral valve varying from moderately convex to very gibbous, and sometimes geniculate towards the front. Area narrow. Foramen none, or a narrow elevation or callosity in place of it. Surface marked by very prominent sharp angular ridges and intermediate fine undulating striae, which cover also the slopes of the ridges. Sometimes a few short wrinkles mark the spaces between the ridges, along the cardinal margin towards the hinge extremities.’’— Hall, 1859. Stropheodonta (Leptostrophia) planulata (Hall) Plate 46, figures 36-38; plate 47, figures 1, 2 Strophodonta planulata Hall, 1859, Pal. N. Y., vol. III, p. 184, pl. XVI, figs. 9-12, 1861. Stropheodonta planulata Schuchert, 1897, U. S. Geol. Surv., Bull. 87, p. 426. Stropheodonta planulata Weller, 1903, Pal. N. J., vol. III, p. 276, pl. XXVII, figs. 1, 2. Stropheodonta (Leptostrophia) planulata Schuchert, 1913, Md. Geol. Surv., L. Dev., p. 315, pl. LVHI, figs. 14-16. 188 THE DEVONIAN.OF MISSOURI. Description—‘‘Shell semi-elliptical, width nearly one-half the length, plano-convex; hinge line greater than the width of the shell below; the cardinal extremities often salient. Dorsal valve flat. Ventral valve uniformly and very slightly convex, sometimes flat- tened towards the margins; beak scarcely elevated above the hinge line. Area linear. Foramen unknown. Surface finely and evenly striated; striae of the dorsal valve often flattened. Radiating striae crossed by fine closely arranged concentric striae, and some- times with a few inconspicuous laminae of growth, and towards the wiih gh extremities by a few wrinkles or undulations. “{Remarks] * * * The striae are fine, equal or subequal, gently undulating, and increasing both by bifurcation and interstitial addition. A very slight exfoliation obliterates the concentric striae. The surface, when very slightly weathered, presents numerous punctures arranged i in lines parallel with the striae; and these punctures are often visible upon the fresh unworn surface ¥e y ~ ; . —Hall, 1859. Genus Strophoneiia Hall Strophonella punctulifera (Conrad) Plate 47, figures 3-6 Leaptaena punctulifera Conrad, 1838, 2nd Rept. N. Y. Geol. Surv., pp. 112, 117. Strophomena punctulifera Vanuxem, 1842, Geol. N. Y., Rept. 3rd Dist., p. 122, fig. 5. Strophomena (Strophodonta) punctulifera Hall, 1857, 10th Ann. Rept. N. Y. State Cab. Nat. Hist., p./50, fe“ Strophodonta cavumbona Hall, 1857, 10th Ann. Rept. N. Y. State Cab. Nat. Hist., p. 51. Strophomena punctulifera Rogers, 1858, Geol. Penn., vol. II, pt. ll, p. 825, fig. 648. Strophodonta punctulifera Hall, 1859, Pal. N. Y., vol. III, p. 188, pl. XXI, figs. 4a, b;, pl. XXIII, figs. 4 a-c, 5c, 7e, 1861. Strophodonta cavumbona Hall, 1859, Pal. N. Y., vol. “III. pl. 187, pl. XXI, figs. 1-3, 1861. Strophomena punctuli fire Billings, 1863, Proc. Portland Soc. Nat. Hist., p. 108, pl. 3, fone 3 Strophomena punctulsfera Bilas: 1863, Geol. Canada, p. 957, fig. 448. Sirophomena punctulifera Billings, 1874, Pal. Fossils, vol. II, p. 31, pl. 3, fig. 2. ~ Strophonella punctulifera Hall, 1879, 28th Ann. Rept. N. Y. State Mus. Nat. Hist., p. 154. Strophonella ap oes Hall, 1883, Rept. State Geol. N. Y. for 1882, pl. XLIII, figs. 10-12. Strophodonta punctulifera Walcott, 1884, U. S. Geol. Surv., Mon. VIII, 2p. 1215ipl. 13, fig. 10. Strophonella punctulsfera Hall and Clarke, 1892, Pal. N. Y., vol: VEL, :ptv1, pi292, pl. XII, figs. 10-12. Strophonella cavumbona Hall and Clarke, 1892, Pal. N. Y., vol. VIII, pt. I, pp. 291, 292. Strophonella punctulifera Weller, 1903, Pal. N. J., vol. III, pp. 277, 301, pl. XXVII, figs. 6-8; pl. XX XIII, fig. 9. Strophonella punctulifera Shimer, 1905, N. Y. State Mus., Bull. 80, p. 242. Strophonella punctulifera Clarke, 1908, N. Y. State Mus., Mem. 9, pt. 1, p. 111, pl. 37, figs. 10, 11. Strophonella punctulifera Clarke, 1909, N. Y. State Mus., Mem. 9, pt. 2, p. 45, pl. 9, figs. 16-18. Strophonella punctulifera Schuchert, 1913, Md. Geol. Surv., L. Dev., p. 323, pl. LIX, figs. 8-10. Description—‘‘Shell subsemicircular, about four-fifths as long as wide. Ventral valve concave; beak not projecting beyond the hinge. Dorsal valve concave near the umbo, very convex near the middle; beak not elevated above the cardinal margin; sides somewhat contracted below the extremities of the hinge. Hinge line straight, nearly ay CAF Pees Ve ae, a Po BRACHIOPODA. 189 or quite equalling the greatest width of the shell, finely crenulated. Area narrow, lineai, vertically striated. Foramen nearly closed, with a narrow prominent callosity along the centre. Surface marked by strong sharp striae, which increase by bifurcation and interstitial addition, becoming rapidly more numerous and finer towards the margins, and are distinctly punctate in che best antesenyed Sp pmene. gimemorks) “Kips? z Pipa opie P i The striae, even in those scarcely exfoliated, are marked by one or two rows of elevated pustules, which are punctate at their extremities, and appear to be the bases of small tubular spines. This character, however, is very variable, and in some specimens obscure upon the surface of the shell, while it becomes conspicuous on the exfoliate specimens, and the casts are pone punctate, were the interior of the shell is distinctly Jai . * = is . * + ne rs * 4 x —Hall, 1859. Genus Leptaenisca Beecher Leptaenisca concava (Hall) Plate 47, figures 7-16 Leptaena concava Hall, 1857, 10th Ann. Rept. N. Y. State Cab. Nat. Hist., p. 47. . Leptaena concava Hall, 1859, Pal. N. Y., vol. IIl, p. 197, pl. XVIII, figs. 2 a-f, 1861. Leptaena? (subgenus?) concava Hall, 1883, Rept. State Geol. N. Y. for 1882, pl. XLVI, figs. 30, 31. Leptaenisca concava Beecher, 1890, Am. Jour. Sci., 3rd ser., vol. XL, p. 238, pl: 9, figs. 1-5. Leptaenisca concava Hall and Clarke, 1892, Pal.-N. Y., vol. VIII, pt. I, p. 300, pl. XV, figs. 30, 31; pl. XVa, figs. 19-21. Leptaenisca concava Clarke, 1909, N. Y. State Mus., Mem. 9, pt. 2; p. 46, pl. 10, figs. 7-11. Leptaenisca concava Schuchert, 1913, Md. Geol. Surv., L. Dev., p. 310, pl. LVII, figs. 2-5. Description—‘‘Shell concavo-convex, hemispherical. Ventral valve regularly convex; umbonial region prominent; cardinal margin rounding from the beak towards the lateral extremities. Dorsal valve deeply concave. Hinge line less than the greatest width of the shell. Area of ventral valve broad, that of dorsal valve linear. Foramen triangular, nearly closed above by a thick callosity, the lower part occupied by the promi- nent cardinal process of the opposite valve. Surface marked by very fine close radiating striae, each fifth or sixth one a little more prominent than those between; crossed by fine regular concentric wrinkles, producing a beautiful subcancellate appearance. ”"—Hall, 1859. Remarks—The relative width of the hinge line is determinable on but three of the eleven specimens observed. These have their greatest width along the hinge line. The ventral valves of the observed specimens are either flattened or depressed, medially, from the cicatrix to the anterior margin. The radiating and concentric costae which ornament the shells are wavy. _ Hall and Clarke figure two ventral valves of L. concava from New York whose . greatest width is along the hinge line.! : Clarke says: ‘‘When Beecher described the genus Leptaenisca there was but one species known, the L. concava of the Helderbergian. We subsequently described as additional species from the same fauna two smaller forms, L. adnascens and L. tangens which then seemed to differ from the larger both in form, surface sculpture and degree of attachment or size of cicatrix. We have before us in the Dalhousie fauna shells which at maturity present the characters of L. concava; their deeply convex and concave shells, with a cicatrix well developed, the form arched but frequently distorted in growth and 1Pal. N. Y., vol. VIII, pt. I, pl. XV, figs. 30, 31, 1892. 190 THE DEVONIAN OF MISSOURI. some of these present a median flattening or sinus pretty well defined on the earlier portions of the ventral valves though this disappears in later growth. This median depression is one of the differentials of the smaller species L. tangens and L. adnascens and may indicate the possibility that the latter represent miniature conditions of: L. concava. The presence of Leptaenisca concava in these beds is our first knowledge of the occurrence of the genus outside of the early Devonic of New York. The species are rare members of the Helderbergian fauna. At Dalhousie the shells are quite abundant.””! Schuchert figures a ventral valve from Maryland which is depressed medially, and whose hinge line is less than the greatest width of the valve.* Superfamily Pentameracea Family Porambonitidae Genus Andstrophia Hall ~ Anastrophia verneuili (Hall) Plate 47, figures 17-21; plate 48, figures 1-9 Atrypa lacunosa Vanuxem (not Sowerby), 1842, Geol. N. Y., Rept. 3rd Dist., p. 117, fig. 3 and p. 119. Pentamerus verneuili Hall, 1857, 10th Ann. Rept. N. Y. State Cab. Nat. Hist., p. 104, figs. 1, 2. Pentamerus verneuili Hall, 1859, Pal. N. Y., vol. III, p. 260, pl. XLVIII, figs. 1 a-i, k-p, r-v, x, y, 1861. Pentamerus verneuili Billings, 1863, Geol. Canada, p. 957, fig. 453. Anastrophia verneutl Miller, 1889, N. Am. Geol., Pal., p. 334. Anastrophia verneuili Hall and Clarke, 1893, Pal. N. Y., vol. VIII, pt. II, pp. 224, 225, pl. LXIII, figs. 31-38; pl. LXXXIV, figs. 43, 44, 1894. _ Anastrophia verneuili Girty, 1899, U. S. Geol. Surv., 19th Ann. Rept., pt. III, p. 565. Anastrophia verneutli Dunbar, 1919, Tenn. Geol. Surv., Bull. 21, pl. 2, fig. 14. Description—‘‘Shell subglobose; transverse diameter generally greater than the height. Ventral valve nearly circular or transversely elliptical, more depressed than the opposite, having a distinct sinus, commencing near the beak and regularly widening and deepening to the front, where it terminates in a short truncated extension fitting into a corresponding depression in the front of the other valve; beak shorter than the opposite, perforated by a triangular or subcircular foramen, which is generally covered by the strongly gibbous incurved beak of the other valve. Dorsal valve very much elevated; beak extremely gibbous or ventricose, and strongly incurved. Surface marked by from twenty-four to thirty sharply angular elevated plications, which increase by interstitial addition and bifurcation; from four to six of the plications on the ventral valve usually occupy the sinus; while from five to eight of those on the dorsal valve are very slightly elevated, so as to form a flat rather indistinct mesial fold. “TRemarks| * * The larger valve is the dorsal, and bears the two internal septa; while the smaller valve, or that with the sinus, is the ventral valve, having the triangular cavity beneath the beak, with a perforation at the extremity, and the dental lamellae are produced into the elongated cavity * c and which, from the thickening of the valve, is often affixed to the shell at its base without the intervention of the usual septum, which, when present, is a very subordinate feature. The dental lamellae are lobed on the outside * 2 leaving a space for the interlocking .of the septa or brachial lamellae of the opposite valve. The dorsal valve is marked by two converging septa, which extend scarcely more than one-third of the length of the shell, and terminate in a thickened ridge in the deepest part of the valve. From these IN. Y. State Mus., Mem. 9, pt. 2, p. 46, 1909. 2Md. Geol. Surv., L. Dev., pl. LVII, fig. 5, 1913. ti —————————<>sq9pun “ds soqsoaRy “F A faire aL etn Sustkon: sd caer Oia e tiniest sae sea alene ‘TTeH oerSsequopyey “Jo soyisoaeg “gs ay Wes) el a 6) © wh S gajie hu) Re) la Bw 9 ee, Ones ie **aou “ds SISUSUT[eS siyuemgdez, S n) So. 6) @fm 8) ©) 9) © eiwiisie b) si-4) al die! # ee! * «vim me *-**,ou ‘ds sTur10jnNU.100 sryuemydez, “yi pozoyuUy “sotoeds poyelo1—e ‘90091990 soyOousp—xX ‘aTAVL TVNOVA THE DEVONIAN OF MISSOURI. 216 x x x x x BR Vee seabed ae ere Soe: (a) Sea ee aa aaa his oh tar va ee! Bw neuyjayseo jmosTyo.anur Jeyiaidg UF - x x x r x x x hue eae or oN fe ge my 3 Cheval Waste wwe ep By Lee! 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Saha a eh “Ne Beak UIE NN Py all SO SN ene ates MED ia Fe a) SI ENDL BALL CO pS TS SNE SS EEE | : os 5 2 5 g 2 e 2) 2 wp a wp 7 : os n = ° an x) le Ee et = i a 3 a 2. o 2 ee | Be =6 = 5 eh e 5 a ® os | og ‘gotoods poyejai—e 5 ee rein cee Mpeg) ee Baltes os Me 5 nm ‘90U911NI990 soyouUsp—x “99sseuusd, |, “puelAre yy “yO KR MONT ‘edsex *TANLOSST PAT ‘ponuyjuoO—aATaV IVNOVA 217 LITTLE SALINE LIMESTONE. tal “ al Cs] “x Oo) CM wo Kw aK nw KK ea nw os ia 4a oS 4 al wow ww ww x KKK tal MRK KK eM KK OK OK ww nw KKK KK KM neh AAR artis aR An GER NiO ga ag or (pequog) wnsoo1queA euOysos0yderq “£8 ee RA. Wes BAI SS a RE: elon ee aa Mie TeH wNyeqoy sezooAIV[a °Z8 RRR Pate be Sige Pee eee AY Re usleyO WnomMooqns “Jo se1dAAeTA “18 er ee yee rg San Sep a, TH wnssoyosr sesso44eTq “08 TOE ag. 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AES eS Cag Oe ke atten Aou ‘ds umssoadap seiaoAIe[q "89 peta, Otc Pea eee NE po ae Ria Coan iaciee cr oa oMOY oryNsue seseoAIe[g *29 STR aS EE eet oe RE Kae nO CPE ee TleH vson4103 eDAUOYWO “99 Sra ae ot OE Red er RB CCE Aou ‘ds wmoruosersd eracuoy341Q *S9 Se eM Mme tarts, COP PhS pat Ot. Rete OHILIO Teg emAUOTIIO "FO Se AE Seseteeeeeesssss*,ou ‘ds rueyye snpsysoydong “29 ppodo.isvp : SS, TOAD dos eR ee AA ne BA Re! A a eee ds uajoodojnoray *29 | Seen nnn non occ oO Cnc ds emejdounoy “19 RAR! Stach! MBAR ON ai Sk ee eat. Rance ‘ -gyae[O stusisur eoydouyoy *09 ppodhoajag SPanrit ert atarehs eteaa alts: lami aka ee eos-5+++*(pemmog) seqtjeqey vooyjodouy “6S Bro dabiasa IY ahs fe Le ater aa rare eeene ed cee (eH) eurojoyorp woey,0[douy ‘SS Sa ea iets A Seti oe Bar Re NEON Sane i ee Aou “ds sTTeao eyOsMMeI “LS AOE SAM AE PO ect Pa OS RR TORO --*-aou ‘ds Rode eTOISMOT = *9S caae a Wt alton phe he we hose © PROS ee, Be OP ae *Aou ‘ds 2) RULIeO RB]JOISLIO INT Gg. Bt CRN Ie chs rene epee Meateioee eon Reet eo etiges Wh arenes Aou ‘ds vpdue eypoysoyt FS Ree Tae ee Seat RAED 5 she, mites “ag (eH) vsoorueA ‘Jo eardsoopnny “eS eid too Siac Rent hana Serine AU Shi Rai Ge eae (eH) weLsHTU eadsoyeuerT, “ZS fia i ak techy ete aera eae pene nh sn ee ae Aou ‘ds wyenueyye eardsoyoucgy “1S Oe eit ant RE Rn gge EReS Ct oe TRO A Rs eee eH wesor VUNASO “OS sy neh catia cees AER HE OPES are any Tae TNS “Te eaeprxéd eysepdeqeyy “Jo “6F ey aie Male hs (idee lati Clee. see DS) ey Sees ab eo Naps miele en: ee Lee se eH BSOOMIVA ‘yo sosiaidg ‘SP THE DEVONIAN OF MISSOURI. 218 my Stee | Ab iced Say fel a ie Ee PL ET ee US Pt EN pret SR ER, SE a SS Pe eS SS a p fs ae 8 12 br a se ay \rocett teense Aten SPA iy ae cotleoas tess tae SERRE aT eee s[e0L, Bee RAPES Che ccags 5 Feather, os ahel Nae e's Brera teal Baahes sek eae Naat ea ds sdoseyg “ZOT - a Pe Gece ““TeE eyeqsHIO sdooeya “TOT x Ne? ie NS et CY ee Ue OO Ber |g i aS eb ae a eye oe Lee eee wo ae eee « Sitek@ pele ee ds snovyds1p “OOT g x Sts eel ts) ee pe ee ete ls Boe vse Ws be 8? OLE Bi et . “AOU ‘ds eunuerid soqrImemye qd 66 Sth er re eerste MLS a re slr ae see Bee ee ee oe jopun ‘ds sojraemyeq 86 5 x 5 eltg lt Mas etal TRY PERO ih SMC re OMIL[O SUOSIOAUOD “IVA SNYeUITMOYS “Jo soyTURMATeq “26 re INNS abs ales Big, Ne nto Keba he sa yorn ea Tee By iat ee ee: ‘aou ‘ds TuIOD0;s sopUeUMye Cy ‘96 e e e x ae So wakae tes ei Saw, remap aha) a a) area lacs eRe Te ( mea1y) xAqdoumoyd ‘Jo soyruewmyeq. "C6 e f 7? * rem dea IL lon claheys wha taco 2 Ma aad Wieck Bae te (ueex5) ysnmsorm soyTUeMTEg “FG * ERs lDe nels Ce A ek Ah ee RRO RE Ae OMIRIO SNAVUTISIG “Jo sorTURMMTeG “86 Re x MEW te atk ere ee) En se ee ee eee en wee ee ee ae et ese TOTO M. snsourdse ‘jo soqluemy[eq *S6 x x x ole fe ek olb @ ee ee Beles beara et et Bee ae eee) eis) eee Pe we. lle&H sdA4a3 SVYOTIOVLIIO ‘16 : Spahr atn Ae sf OS tare os tS Rade Pe ae te RANE CAD ake Sea EN Soe ds styort ‘06 i - CMAs sc Rota a ges. Ge Aes ire Cae gece eA + +++ “Tex swesreqnioad snIe0Ig “68 * ae ie tain a cere cae hoe Rae ert ien qqoueg snyeusepAyord “Jo snie01d “88 = - Beh |S Sets DEA tn tcorld Saye ators me neki Lae dee Oa on ere - “TRH Ipequoo smeorg “28 = Sion rh SPOR SER EERE, Puy IM A RR HOM Sa qepun ‘ds sidseproy “98 DPLQOPLLT, : be m4 o Bee AE eh a ie Sea gina te a pats eqn ante wags OEE -<-TeT sngeSuoye soyoeuez es S a EEO ek ORES LOM AREAS, EE ri @MIV[O SAXO “Jo SOUTOAH “FB ppodo1aid ; oot p Pe Beet ah 2 omer ee ak eA B a = ° a bat 32 By ra 2H ® 5. = ae = 5 at = a8 Be | Be =| 5 5 Be sy 5 A os oa | og ‘soloods poqejai—e 2 ® 5 aber Se FS be g 3 we 5 aK *90U91IND00 seJousp—x ‘gossouue,y, “purpsreyAl “yIOX MON ‘edsey “TMOSSTIAL ‘ponuyuoO—aATaViL TYNOVA ee) re Se! Te . ee per pee LITTLE SALINE LIMESTONE. 219 The corals observed from this geological horizon are few, and form a minor portion of the fauna. Only four species have been identified, all from the lower beds. Of these two species belong to new and undescribed forms: Zaphrentis cornuformis, and Zaphrentis salinensis, and they seem to exhibit little resemb- lance to any previously described lower Devonian forms. Thus far but a single well preserved Crinoid base has been - noticed, belonging to the genus Edriocrinus. Most of the bryozoans occur in the upper beds, and the relative abundance of the fenestellids and fistuliporids point to an early Devonian age for the fauna. Of the 11 species identified, 4 are present in the lower beds, and 8 in the upper, only one species, Monotrypa tabulata, ranging through both horizons. They have for the most part been replaced by lime carbonate, and their condition of preservation is such that identification is difficult and more or less uncertain. From a careful study of thin sections it has been possible to identify at least six new species, the others showing affinities with described forms occurring either above or below the Oriskany. The brachiopods are chief among the classes represented, and form a large portion of the fauna, 43 species have been identified, which is approximately 43 per cent of the whole. Of these, eleven species, or about twenty-five per cent belong to new and hitherto undescribed species. Of the remainder, two do not admit of certain determination, twenty-three occur in the Oriskany of New York and Maryland, and the remainder occur either above or below this horizon. The age of the fauna is suggested by the large size of the brachiopods, although generally speaking, they do not attain so large a size as do the New York examples. Rensselaeria ovoides is considerably smaller, although many of the mature forms are larger than Rensselaeria marylandica, which is the southern representative of this species in Maryland. An exfoliated portion of the pedicle valve of an exceptionally large Leptostrophia magnifica has been observed, and many smaller examples. It is particularly noticeable that the brachiopods are for the most part represented by the separate valves only, and except in one or two species entire specimens occur but rarely. Entire speci- mens of Eatonia peculiaris are present in a splendid state of preservation, and are common both in the lower and in the upper beds. 220 THE DEVONIAN OF MISSOURI. The characteristic Atrypa reticularis is but meagerly repre- sented, and only in the upper beds. The cosmopolitan Anoplo- theca flabellites is rarely present, and so far as known is restricted to the lower beds. Spirifer arenosus and Spirifer murchisoni are present in greater abundance. The Meristellid brachipods show distinct differences from described forms, and are represented by at least four new species, which are restricted to the lower beds. The following species of brachiopods range flerouledy both horizons: Rhipidomella emarginata, Dalmanella oriskania, Rhipi- domella musculosa, Leptaena ventricosa, Leptostrophia magnifica, Leptostrophia magniventra, Chonostrophia complanata, Eatonia peculiaris, Plethorhyncha principalis, Rensselaeria ovoides, Rens- selaeria cf. stewarti, Spirifer arenosus and Spirifer murchisoni. A few fragments of Pelecypods occur in the lower beds but these present no diagnostic characters. 3 Quantitatively the gastropods come next in importance to the brachiopods. The assemblage is particularly characterized by the Platycerid type, and they present the characteristic lower Devonian aspect. They are for the most part restricted to the lower beds, 18 species occurring there, while only 6 occur in the. upper. Only 3 species persist through both horizons. These are: Platyceras nodosum, Platyceras planovolvis and Diaphorostoma ventricosa. Of the 21 species which have been identified, five species and one variety are new, or approximately 28 per cent of the whole. Of the remainder, 10 occur in the Oriskany else- where, and 7 in the Helderbergian. One form, Platyceras dumosum, is an Onondagan species. Four of the species range through the Helderberg and the Oriskany. These are: Platyceras gebhardi, Platyceras newberri, Platyceras reflexcum and Diaphoros- toma ventricosum. One form, Platyceras peregrinus, belongs to that type of laterally compressed Platycerid shells, which is so common among the South American faunas. The trilobites, although not represented by numerous indi- viduals, belong to 17 different species. The specimens are all fragmentary, and not one entire example has been observed. Twelve species occur in the lower beds, and 7 in the upper, only 2 of these, Proetus protuberans and Phacops cristata, ranging through both horizons. Two new species have been described. Of the remainder, four occur in the Oriskany of New York and Maryland, seven in the Helderbergian of New York and Mary- land, and two in the Onondagan of New York. ‘we § DESCRIPTION OF SPECIES. 221 The material on which this study is based is preserved in the collections of Walker Museum of the University of Chicago. The writer wishes to acknowledge the helpful criticisms and sug- gestions of Professor Weller under whose constant supervision this paper has ‘been prepared, and especially to acknowledge her indebtedness to him for the assistance given in the photo- graphing of the specimens. DESCRIPTIONS COELENTERATA Class ANTHOZOA Subclass Tetracoralla Family Zaphrentidae Beale Zaphrentis Rafinesque Zaphrentis cornuformis sp. nov. Plate 57, figures 3-7. Description—Corallite of medium size, simple, turbinate, commonly a little curved, rarely straight, the greatest curvature occurring near the apex; sides tapering gradu- ally and uniformily, apex acute. The dimensions of the type specimen which is an average sized individual are: Length 85 mm., diameter of upper part of cup approxi- mately 40 mm. Irregular wrinkled lines of growth give the shell an annulated appear- ance. Septa strongly marked on the exterior of the coral, about 85 in number where the diameter of the coral is 35.mm. A cross-section of the lower part of the cup shows the septa to be of equal length, almost reaching to the centre and not coalescing. A well- developed fossula occurs. Tabulae not observed, probably not well developed, or if present they have been poorly preserved.. Character of cup obscure. Remarks—This species may be distinguished easily from the other simple corals in the fauna, and likewise it is the most abundant. It differs from Zaphrentis salinensis in its more slender and tapering outline, in the distinct curvature of the sides, and it presents a less massive appearance. The septa are generally smaller. Horizon—Lower beds. Holotype and Paratypes No. 27552 Walker Museum. Zaphrentis salinensis sp. nov. Plate 57, figures 1, 2. Description—Corallite simple, large, conical, sides straight, expanding gradually and uniformily. The dimensions of the type specimen are: Length about 80 mm., diameter of calyx approximately 55 mm. Tabulae not observed, possibly not strongly developed. Encircling lamellae are present on the part of the coral preserved. Septa about 90 where diameter of calyx is 45mm. Length of septa, character of upper part of cup, and fossula not observed. Remarks—One large incomplete example, and a smaller one, which appear to belong to this species, have come under observation. Horizon—Lower beds. Holotype and Paratype No 27553 Walker Museum. 222 THE DEVONIAN OF MISSOURI. Subclass Hexacoralla Suborder Tabulata Family Favositidae Genus Favosites Favosites cf. helderbergiae Hall Plate 57, figure 8. 1874. Favosites helderbergiae Hall, N. Y. State Mus., 26th Ann. Rept., p. 111. * 1887. Favosites helderbergiae Hall, Nat. Hist. N. Y. Pal., vol. 6, p. 8, pl. 4; figs. 1, 2; pl. 5, figs. 1-3; pl. 6, figs. 1-8. 1913. Favosites helderbergiae Swartz, Geol. Surv. Md. Low. Dev., p. 208, pl. 22, fig. 1, Description—‘‘Corallum consisting of large, lenticular, depressed, convex or hemis- pherical masses; base covered by a strongly wrinkled epitheca. Cell tubes polygonal; their inner surface showing evidence of a few strong longitudinal striae. Septa frequent, from 10 to 15 in the space of 10 mm.; thickness equal to that of the cell walls. Mural pores in one or two ranges, comparatively large, circular, with margins distinctly elevated. Cell walls thin, but frequently much thickened near the surface by silicification, and » sometimes granulose or spinose on the inner face. On some specimens the cells, at the surface, are nearly equal, having a diameter of about 1.5 mm.; on other specimens the diameter varies from .66 to 1.5 mm. On many of the specimens some of the cell tubes are larger and less angular than those surrounding them, being a little more than 2 mm. in diameter.—‘‘Hall, 1887. Remarks—A few specimens have been observed in the Little Saline limestone which are doubtfully referred to this species. The specimens are fragmentary and in no case show the hemispherical outline which characterizes the corallum of the species. The corralites are prismatic, polygonal, more rarely hexagonal. The mural pores are irregu- larly disposed, at least two rows being present. Longitudinal striae not observed. The diameter of the cell tubes varies considerably; some of them being as large as 2.5 mm. in diameter. Horizon.—Lower beds. Figured specimen No. 27554 Walker Museum. Favosites sp. undet. Plate 57, figures 9, 10 There are present in the collection studied, several impressions of the epitheca of the concave bases of the Favosites. They do not exhibit any diagnostic characters, and are recorded only to show the presence of this type of coral in the Little Saline limestone A tentative comparison may be suggested with Favosites foerstet as figured by Dunbar. from the Tennessee beds, with this difference, that Fave sites foerstet is characterized by convex bases, while the Little Saline form is concave. Horizon—Lower beds. Figured specimen No. 27551 Walker Museum. “ee lil A | le iis aor aan % CRINOJDEA. 223 ECHINODERMATA Class CRINOIDEA Order Indeterminate Family Indeterminate Genus Edriocrinus Hall Edriocrinus cf. sacculus Hall Plate 57, figure 11. 1859. Edriocrinus sacculus Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 143, pl. 87, figs. 1-22, 1861. 1913. Edriocrinus sacculus Ohern, Geol. Surv., Md. Low. Dev. p. 256, pl. 40, figs. 7-12. A single base of the Edriocrinus may be compared with this species. The concave depressions on the upper margin into which the radial plates fit are not clearly defined. Horizon—Lower beds. Figured specimen No. 27559 Walker Museum. MULLUSCOIDEA Class BRYOZOA Order Cyclostomata Family Fistuliporidae : Genus Fistulipora McCoy Fistulipora acutula sp. nov. Plate 58, figures 1, 2. Description—Zoarium massive, under surface with a wrinkled epitheca; cells tubular, apertures somewhat irregular in outline, usually subcircular to oval; lunarium only slight- ly developed, and causing a slight angular protuberance of the peristome, the protuber- ances having the same general direction. Apertures fairly regularly and closely dis- posed, usually distant from one another from .25 to .75 mm. Cell walls thin. Vescicles angular, generally smaller than the cell apertures. Cells tubular, cylindrical, characterized by numerous diaphragms which are oblique to the walls and convex upwards. Interstitial tissue abundaritly developed, composed of vesicles irregularly disposed and not having the appearance of tubes divided by septa. Surface characters not observed. Remarks—This form may be distinguished from Fistulipora variolata by its less massive appearance, by the slighter development of the lunaria, and by the presence of diaphragms in the cell tubes. Horizon—Lower beds. Type specimen No. 27651 Walker Museum. Fistulipora variolata sp. nov. - Plate 58, figures 3, 4. Description—Zoarium massive, under surface with a concentrically wrinkled epi- theca. Cells tubular, without diaphragms, apertures extremely irregular in outline, the 224 ' THE DEVONIAN OF MISSOURI. irregularity depending on the degree of development of the lunarium; disposition of the apertures also irregular, in some cases they are nearly touching, in others being as much as.75mm. apart. Cell wallsthin. Interspaces filled with vesicular tissue, vesicles angu- lar, sometimes as large as the apertures but usually smaller. A longitudinal section shows the abundant development of the interstitial tissue, and the irregularly shaped cell tubes. The vesicles are irregularly disposed in some places, but elsewhere are more regular and have the appearance of cylindrical tubes divided by septa. Remarks—The distinguishing characteristics of this species are the extreme varia- tion in the shape of the cell apertures caused by differences in the amount of develop- ment of the lunaria, and their irregular arrangement. This irregularity in disposition, and the large and numerous vesicles suggests a relationship with Favosites parasitica Hall, but that form is explanate or ramose, while the Little Saline forms are massive. Horizon—Lower beds. Type specimen No. 27650 Walker Museum. Genus Meekopora Ulrich Meekopora sp. Plate 58, figures 5, 6. Description—Zoarium lamellar, explanate, bifoliate; apertures obliquely inclined, apparently toward the distal margin of the branch, uniform in size, regularly spaced, _about three occupying the space of one mm., margin of apertures slightly above the interspaces. Lunaria well developed, walls thin. A longitudinal section shows the bifoliate character of the zoarium, and the convex interspaces between the cell apertures; apertures broader than long. Diaphragms lacking. Remarks—This form is especially characterized by the well developed lunaria. The fact that no diaphragms are present is peculiar since the presence of these struc-, tures is mentioned in the description of the genus. Horizon—Upper beds. Figured specimen No. 27652 Walker Museum. Order Trepostomata : Suborder Amalgamata Family Heterotrypidae _ Genus Heterotrypa Nicholson Heterotrypa undata sp. nov. Plate 58, figures 7, 8. Description—Zoarium ramose, branches bifurcating, their diameter about 20 mm. Zooecial apertures irregularly disposed, varying somewhat in size and shape, generally polygonal in outline, 3 to 4 occupying the space of 1 mm. Walls thick. Mesopores numerous, exhibiting considerable variety in size and shape and having no definite order of arrangement. A longitudinal section shows the mesopores to be well developed in the mature portion of the zoarium, but absent in the younger. The zooecial tubes grow upward from the base, then bend sharply outwards almost at right angles. Numerous diaphragms cross the zooecial tubes in the mature region, for the most part disposed irregularly, and in a few cases concave downward. Mesopore walls commonly undu- lating. Small, scattered, acanthopores are present. * BRYOZOA. 225 Remarks—This species suggests some relationship to Moticulipora ( Heterotrypa) barrandii Nicholson, of the Hamilton, but is characterized by thicker walls, more abund- ant mesopores, and undulating zooecial walls. Also there is a greater variation in the shape and size of the zooecia. Horizon—Lower beds. Holotype No. 27653 Walker Museum. - Suborder Integrata Family Tematoporidae Genus Monotrypa Nicholson Monotrypa cf. tabulata Hall Plate 59, figures 1-3. 1882. Chaetetes? tabulatus Hall, Rept. State. Geol. N. Y., pl. 9, figs. 12-15. 1887. Chaetetes (Ptychonema) tabulatus Hall and Simpson, Pal. N. Y., vol. 6, p. 14, pl. 9, figs. 12-15. 1913. Monotrypa tabulata Ulrich and Bassler, Geol. Surv., Md. Low. Dev., p. 278, pl. 50, figs. 1-4, Description—Zoarium apparently in subspherical masses, having a diameter of from 40 to45 mm. Zooecia closely crowded, irregularly polygonal in outline, sometimes hexagonal, usually about 3 in the space of 1 mm. Walls thin, in longitudinal section appearing extremely wavy, the undulations especially prominent in the mature region; diaphragms sparsely present. Mesopores and acanthopores absent. Remarks—This is the most common bryozoa in the Little Saline limestone. The specimens exhibit the characteristic polygonal zooecia, and the corrugated walls of Monotrypa tabulata Hall, but differ in the presence of the diaphragms, and in having the undulations of the walls less persistent. Horizon—Lower and upper beds. Figured specimens No. 27658 Walker Museum. Order Cryptostomata Family Fenestellidae Genus Unitrypa Hall Unitrypa cf. iat Hall Plate 59, figure 4 / 1883. Fenestella (Hemitrypa) lata Hall, Trans. bay Institute, vol. 10, (abstract 1881, p. 34). 1885. Unitrypa spatiosa Hall (in error), ep of ‘State Geol. N. Y. for 1884, pl. 2, es 12 1887. Fenestella ( Unitrypa) lata Hall and Simpson, Nat. Hist. N. Y. Pal., p. 136, pl. 52, figs. 1-10. Meer itive -Zoariuin apparently infundibuliform, size unknown; branches of medium strength, width above a bifurcation .31 mm., increasing to .51 mm. below a bifurcation, straight, slightly rounded to flat on the reverse side, bifurcations infrequent. Interstices and branches of about equal width. Dissepiments slender, from one-half to the same width as the branches, more rounded, and frequently above the plane of the latter. Fenestrules oval, length from .60 to .75 mm., width from .25 to .30 mm., 11 to 12 peony the space of 1 cm. 226 THE DEVONIAN OF MISSOURI. On the celluliferous side the branches are about the same strength as on the reverse side, 17 occurring in 1 cm. Fenestrules similar to those on the opposite face. Cell apertures in 2 ranges, sometimes 3 just before a bifurcation, slightly oblique to the axis of the branch, 16 in the space of 5 mm., separated by about half the diameter of an aperture, sub-circular in outline, sometimes crowded against fenestrules and indenting their borders. _ A thin section reveals the superstructure, formed by the junction of the carinae and scalae. For a short distance the latter are oblique to the former, then gradually se tt until at the junction they are at right angles. é Remarks—This species resembles very closely Unitrypa lata Hall. - In contrast the nodes common to that species have not been observed in any of the specimens studied, and the scalae are somewhat thicker, and the interstices wider than the scalae. Horizon—Upper beds. Figured specimen No. 27657 Walker Museum. : Unitrypa subcircularis sp. nov. } Plate 59, figures 5-7 Description—Zoarium infundibuliform, frond rapidly expanding, size unknown. Branches straight or slightly sinuous, flat, equal to or less than the width of the fenes- trules, bifurcations frequent. Dissepiments strong, approximately the same width as the branches, slightly rounded on the reverse side, and on the same plane with them or a little depressed, expanded at their junction with the branches, 10 to 11 in the space of 1 cm. Fenestrules longitudinally oval, sometimes sub-circular. On the celluliferous side the branches are straight to slightly sinuous, of equal strength with branches on the reverse side, 12 occupy the space of 1 cm., gradually ex- panding in width from .25 mm. above a bifurcation to .30 mm. below. Dissepiments about the same width as the branches or a little greater. Fenestrules elongate oval, length .75 to .90 mm., width about half as great, 11 occupy the space of lcm. Zooecial apertures in ranges of 2, 12 to 13 in 5 mm., oval in outline, separated by about half the diameter of an aperture. Carinae connected by scalae form the superstructure. Interspaces sub-circular, greatest diameter .50 mm., scalae thick, carinated, 30 in the space of 1 cm., expanded considerably where they join the carinae. Remarks—This species resembles Unttrypa tegulata Hall, but the apertures are more widely disposed than in that species. : Horizon—Upper beds. Holotype No. 27655 Walker Museum. Genus Polypora McCoy Polypora cf. hexagonalis Hall Plate 60, figures 1, 2 1883. Fenestella hexagonalis Hall, Trans. Albany Inst. 10, p. 169, (abstract 1881, Beer) 1887. Fenestella (Polypora) hexagonalis Hall and Simpson, Pal. N. Y., vol. 6, p. 164, pl. 33, figs. 14-20. Description—Zoarium apparently infundibuliform, size unknown. Surface essen- tially smooth on the reverse side. Branches of medium strength, sinuous, rounded, gradually enlarging from .40 mm. above a bifurcation to .90 before. Interstices wider than branches. Dissepiments rounded, about same strength as branches, and on the same plane, 3 present in the space of 5 mm. Fenestrules oval, outer rim hexagonal, length to width in proportion of 3 to 2. a ia lial ii a haall BRYOZOA. 227 On celluliferous side the branches are rounded, of uniform size near base of frond and enlarging gradually, reaching maximum width just before a bifurcation, rarely sinuous or anastomosing, bifurcation occurs regularly usually at intervals of 20 mm., width of branches just before a bifurcation .60 mm. Dissepiments strongly developed. Fenestrules elongate oval, width .45 mm., length approximately three times as great. Cell apertures in from two to four ranges, rarely five, 20 in the space of 5mm. Shape not distinctly determined. Remarks—This form has a greater number of apertures than Polypora hexagonalis ' Hall, and the dissepiments are not so distinctly carinated as in that species. Horizon—Upper beds. Figured specimen No. 27660 Walker Museum. Polypora media sp. nov. Plate 60, figure 3 Descriptien—Zoarium infundibuliform, size unknown. Branches of medium strength on the obverse side, sinuous, rounded, sometimes slightly flattened, equal to about half the width of the interstices. Dissepiments about equalling the branches in - strength, or slightly narrower, width from .60 to .70 mm., 4 in the space of 5 mm., flat to slightly rounded, on a plane with the branches. Surface granular. _Fenestrules elliptical in outline, length usually about 1 mm., width from .50 to .60 mm. On the celluliferous side the branches are less sinuous than on the reverse, gradu- ally increasing in width from_.40 to .80 mm. just before a bifurcation, 16 to 17 occupy the space of 1 cm. Dissepiments about the same strength as branches. Zooecial aper- tures in 2 to 4 ranges, 17 to 18 in 5 mm., separated by half the diameter of an aperture, sub-circular in outline, margins distinct. . Remarks—This species differs from Polypora hexagonalis Hall in having the aper- tures more widely disposed, in having a granular surface on the reverse side, and in showing no carinated dissepiments. Horizon—Upper beds. Holotype No 27659 Walker Museum. Polypora valida sp. nov. Plate 60, figures 4, 5 Description—Zoarium apparently infundibuliform, size unknown. Branches strong, straight, rounded slightly or sometimes almost flat, width above a bifurcation .50 mm., increasing to 1 mm. belowa bifurcation. Dissepiments about one-half width of branches, on same plane as latter or a little depressed on the reverse side, 3 in the space of 5 mm. Fenestrules sub-triangular to oval, width .75 mm., length about twice as great, 6 occupy the space of 1 cm. On the celluliferous side the fenestrules are elongate oval. Branches strong, 6 to 7in1icm. Cell apertures in 4 to 5 ranges just below a bifurcation, and from 2 to 3 just above bifurcation, 20 present in 5 mm., circular to slightly oblong in outline, separated by less than half the width of an aperture. Both branches and dissepiments are covered with nodes, these being arranged regularly in parallel bands. Remarks—This species may be differentiated from Polypora hexagonalis Hall, by the less sinuous branches, and by the greater number of branches. From the other asso- ciated species of this geological horizon it differs in having stronger branches, and in the presence of numerous nodes on the celluliferous side. Horizon—Upper beds. Holotype No. 27658 Walker Museum. 228 THE DEVONIAN OF MISSOURI. Family Cystodictyonidae Genus Cystodictya Ulrich Cystodictya cf. rigida (Hall) Plate 60, figures 6, 7 1881. Stictopora rigida Hall, Trans. Albany Inst., vol. 10, abstract, p. 14. 1883. Stictopora rigida Hall, Report of State Geatosiat for 1882, Expl. 25, figs. 15, 16. 1887. Stictopora rigida Hall and Simpson, Nat. Hist. N. Y. Pal., vol. 6, p. 91, pl. 28, figs. 15, 16. Description—Zoarium consisting of a flattened stipe, with straight, bifurcating branches; width of branches about 4 mm., just below bifurcation width increases. to 5mm. Cell apertures oval, length about .30 mm., width about half as great. When split longitudinally and parallel to zoecial surface, the specimens show the mesathecal sur- face which is marked by sub-parallel, angular, and slightly undulating, longitudinal ridges. * . Remarks—A single specimen showing the mesathecal surface has been observed, which resembles this Onondagan species. It differs in having somewhat wider branches, and in having transverse ridges not shown on specimens figured by Hall. Horizou—Upper beds. Figured specimen No. 27661 Walker Museum. MOLLUSCOIDEA Class BRACHIOPODA Order Neotremata Superfamily Craniacea Family Craniidae Genus Pholidops Hall Pholidops ovata Hall Plate 61, figures 1, 2 1859. Pholidops ovatus Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 490, pl. 103, b, fig. 7. 1903. Pholidops ovatus Weller, Geol. Surv. N. J. Pal., vol. 3, pl. 226, pl. 20, figs. 27-29, p. 300. 1913. Pholidops ovata Schuchert, Geol. Surv. Md. Low. Dev., p. 294, pl. 53, figs. 10-12. Description—Shell small, circular to ovate. The dimensions of a pedicle valve are: length 2.5 mm., width 2mm. Apex excentric. The fine concentric lamellae common to this species have not been noticed in the specimens which have come under my observation. An impression of the pedicle valve shows the well defined anterior muscle markings which extend nearly to the middle of the shell. Remarks—This little form of attached brachiopod is represented by three dorsal valves only, and there appears to be no essential variation from the New York speci- mens. Horizon—Lower beds. Figured specimens No. 27488 Walker Museum. a € at . BRACHIOPODA. 229 Order Protremata Superfamily Orthacea Family Orthidae Genus Dalmanella Hall and Clarke -Dalmanella lenticularis (Vanuxem) Plate 61, figures 9-11 1867. Orthis lentecularis Vanuxem, (non Wahlenberg), Geol. N. Y., Rept. Third Dist., 1842, p. 139, fig. 4. Hall, Nat. Hist. N. Y. Pal., 4, 1867, p. 35, pl. 5, figs. 1, 2. 1843. Orthis lenticularis and O. lentiformis Hall, Geol. New York, Rept. Fourth Dist., p. 17, fig. 4. : 1889. Orthts eboracensis Miller, N. Amer. Geol. Pal., p. 357. 1892. Dalmanella lenticularis Hall and Clarke, Nat. Hist. N. Y. Pal., vol. 8, pt. 1, pp. 207, 224, pl. Sc, figs. 36-41. Description—Shell of medium size, sub-elliptical to sub-ovate in outline, plano- convex, width greater than length or almost equal, the greatest width near the middle of the shell. The dimensions of a large pedicle valve are: Length 17 mm., width 19 mm. A small brachial valve measures 12 mm. in length, and 12.5 mm. in width. Cardi- nal extremities rounded. ' Pedicle valve highly convex, the greatest convexity at or a little anterior to the umbonal region. Shell surface sloping gently to the lateral and anterior margins; beak small, blunt, incurved over the hinge line. Character of foramen not observed. A cast of the interior shows the long, narrow median septum extending from the beak almost to the anterior margin. Brachial valve from depressed convex in the upper part to almost flat at the lateral margins; median portion marked by an ill-defined sinus which broadens out at the an- terior margin forming a wide shallow depression Beak small, projecting slightly beyond the hinge line. Surface of both valves marked by fine, radiating, bifurcating costae of uniform size, the bifurcations as many as four in passing from beak to anterior margin; 5 costae occupy the space of 1 mm. Coarser imbricating concentric growth lines cross the striae. Remarks—This characteristic Onondagan species is represented here by the sepa- rate valves only. In the essential features the specimens observed agree closely with those figured by Hall in the New York reports, with this exception, that in the Little Saline forms the costae maintain a more uniform size. 5 Horizon—Upper beds. Figured specimens No. 27481 Walker Museum. Dalmanella oriskanta sp. nov. Plate 61, figures 12-14 Description—Shell of medium size, length usually slightly greater than width, al- though a number of the specimens have the length and width practically the same. The type specimen, a pedicle valve, measures 20 mm. in length and 19 mm. in width. The shape varies from semi-elliptical to semi-circular. Pedicle valve highly convex, elevated or carinated along the median line, the greatest elevation at the umbonal region. The surface of the shell slopes rather steeply to the lateral and cardinal margins, but more gradually towards the anterior margin. Cardinal margins meet the beak at an obtuse angle, extremities rounded. Beak small and slightly incurved over the hinge line. 230 THE DEVONIAN OF MISSOURI.: Brachial valve sub-convex to flat, characterized by a mesial sinus which is narrow. and deep near the beak, and broad and shallow toward the anterior margin. Cardinal margins make a more obtuse angle with the beak than in the opposite valve. . Beak small and inconspicuous. A cast of the interior shows two elongate and narrow muscle scars separated by a deep groove. Surface of both valves marked by radiating costae of uniform size, which bifurcate frequently; 4 occur in the space of 1 mm at a point midway between the beak and anterior margin. These are crossed by coarser concentric lines of growth. Remarks—This species resembles Dalmanella subcarinata Hall of the Lower Helder- bergian beds, but is smaller, with the pedicle valve more highly convex and more elon- gated, and the cardinal margins meeting the beaks at a sharper angle. Horizon—Lower and upper beds. | Holotype and Paratypes No..27482 Walker Museum. Family Rhipidomellidae Genus Rhipidomella Oehlert : Rhipidomella emarginata (Hall) ‘ Plate 61, figures 3-5 1859. Orthis oblata var. emarginata Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 164, pl. 10a, figs. 4-6, 1861. 1913. Rhipidomella emarginata Maynard, Geol. Surv., Md. Low. Dev., p. 302, pl. 55, figs. 1-8. Description—Shell small, a little broader than long, the ine line less than the greatest width, from subtriangular to subcircular in outline. The dimensions of an average small individual are: Length 10 mm., width just below the middle of the shell 11mm. The brachial valve of a larger form measures 13 mm. in length and 14 mm. in width, sf Pedicle valve convex, the greatest convexity ae ee to the middle, with a mesial sinus which is ill-defined near the beak, but becoming broad and more conspicuous toward the anterior margin. Hinge line straight, cardinal margins sloping abruptly from the beak, extremities rounded, giving the shell a circular outline. Brachial valve more convex than the opposite, without well-defined fold; sur- face sloping uniformly from the middle to the anterior and lateral margins. Beak inconspicuous, slightly incurved below that of the opposite valve. Surface of both valves covered with simple, radiating costae near the anterior margin, 3 occur in the space of 1 mm. These are crossed by coarser concentric growth © lines, which are most prominent close to the anterior margin. fe & Remarks—This Helderbergian species is represented in the collection by one entire specimen, and a few separate valves. These are smaller than the forms figured from the Lower Helderbergian beds of New York, and the beak is less elevated. Horizon—Lower and upper beds. Figured specimens No. 27480 Walker Museum. Rhipidomella musculosa Hall Plate 61, figures 6-8. 1857. Orthts musculosa Hall, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist., p. 46. 1859. Orthis musculosa Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 409, pl. 91, figs. 1-3; pl. 95, figs. 1-7, 1861. 1892. Rhipidomella piiscntoee Hall and Clarke, ibidem, vol. 8, pt. I, pp. 190, 210, 225, pl. 6a, fig. 5. — Te eer wees Se PR A Per a eee ee ee BRACULOPODA. 231 1908. Rhipidomella musculosa Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, p. 201, pl. 42, figs. 1-5; pl. 43, figs. 14, 17, 19, 20, 22. 1913. Rit pldomelia peasblert Sehachert’ Geb Surv., Md. Low. Dev., p. 305, pl. 55, fig. 20; pl. 56, figs. 1-4. Description—Shell attaining a rather large size in mature meget slightly broader than long. The dimensions of an average sized individual are: Length 35 to 36 mm., width 37 mm. Suborbicular in outline, hinge line short. Pedicle valve depressed convex, flattened towards the anterior and lateral margins from the umbonal region. Beak small and slightly incurved above the hinge line. The muscular scars are strongly developed, large, fan-shaped, and extend well beyond the middle of the shell. Pallial region prominent. Brachial valve much more convex than the pedicle, the surface sloping gently toward the lateral margins, and more abruptly toward the anterior margin. Surface of both valves marked by fine radiating costae about 3 occupying the space of 1 mm. Concentric lines of growth also cross both valves, and appear to be more prominent on the pedicle valve, especially near the anterior margin. Remarks—This is one of the less common species of the fauna, and all the speci- mens examined are separate valves. Horizon—Lower and upper beds. Figured specimens No. 27479 Walker Museum. Superfamily Strophomenacea Family Strophomenidae Genus Leptaena Dalman ' Leptaena ventricosa (Hall) Plate 61, figures 15-17. 1857. Strophomena depressa var. ventricosa Hall, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist., p. 55. 1859. SS rugose var. ventricosa Hall, INdt, list... Fal. vol, 3, p. 417, pl. 94, figs. 2e, 2f, 3. 1892. Leptaena rhomboidalis var. ventricosa Hall and Clarke, tbidem, vol. 8, pt. 1, pl. 15a, fig. 43. 1908. Leptaena rhomboidalis var. ventricosa Clarke, N. Y. State Mus., Mem. 9, pt. 2, p. 87, pl. 21, fig. 87. 1913. Leptaena rhomboidalis var. ventricosa Schuchert, Geol. Surv., Md. Low. Dev., p, 309, pl. 56, fig. 18; pl. 57, fig. 1. Description—Shell semi-circular to semi-oval in outline, sometimes attaining large size. Width commonly somewhat greater than the length, but in some examples the dimensions are nearly equal. The hinge line is equal to the greatest width of the shell, and the extremities are extended into conspicuous auricular: projections in some cases. The dimensions of the pedicle valve of a large individual are: Length 39 mm., width 40 mm. A smaller shell measures 32 mm. in length and 34 mm. in width. Pedicle valve extremely ventricose, the greatest convexity anterior to the middle of the shell, and from here the surface slopes abruptly toward the anterior margin, and less abruptly towards the lateral margins; above the maximum convexity the surface slopes uniformly to the hinge line. Surface marked by several large concentric wrinkles, which gradually decrease in size toward the beak, the last two or three being quite indis- tinct. Beak rounded and slightly incurved over the hinge line. A cast of the interior shows the strongly marked, fan-shaped muscular imprints, divided longitudinally by a median depression. 232 THE DEVONIAN OF MISSOURI. Brachial valve slopes gently from the hinge to the front, near which it becomes abruptly deflected causing a deep concavity. Concave area marked by concentric wrinkles which are less pronounced than those on the opposite valve. Beak small and inconspicuous. The interior casts show the strongly-marked, longitudinal muscular impressions. Surface of both valves marked by fine, radiating costae, there being 2 or 3 prea in the space of 1 mm. Remarks—This characteristic Oriskany species occurs abundantly in the Little Saline beds, and is only represented by the separate valves in the collection studied. It differs from Leptaena rhomboidalis Hall, in the greater ventricosity of the pedicle valve, in its larger size, and in the more strongly marked muscular imprints. The same species occurs in the Oriskany sandstone of New York, and in the Oriskany beds of the Gaspe region, Canada. Horizon—Lower and upper beds. Figured specimens No. 27478 Walker museum. Genus Stropheodonta Hall Stropheodonta missouriensis sp. nov. Plate 61, figures 21-22. Description—Shell large, semi-circular in outline, width commonly greater than the length, the greatest width anterior to the middle of the shell. The dimensions of two brachial valves, the holotype and paratype, are: Length 38 mm:, width 45 mm., and length 34 mm., width 40 mm. Brachial salve gently concave to about 8 mm. from the anterior and lateral margins, where it becomes abruptly deflected upwards. This abrupt deflection is distinctly marked on the internal casts of the valves. Hinge line straight, finely crenulated, shorter than the greatest width of the shell. Cardinal extremities rounded. An im- pression of the interior shows part of the cardinal process, and the elongate septum ex- tending more than half way to the anterior margin. Surface marked by fine, closely arranged, radiating striae. Pedicle valve unknown. Remarks—There are present in the collection studied only the interior and exterior impressions of the brachial valve. The form somewhat resembles Strophoedonta linck- laent Hall, but is proportionately smaller, has a more pronounced semi-circular outline, . more extended cardinal extremities, and with the hinge line shorter than the greatest width of the shell, and lacks the curvature of the lateral margins just below the cardinal angles. Horizon—Lower beds. Holotype and Paratype No. 27475 Walker Museum. Stropheodonta cf. demissa (Conrad) Plate 61, figure 18. 1842. Strophomena demissa Conrad, four. Acad. Nat. Sci., Phila., vol. 8, pl. 258, pl. 14, fig. 14. 1867. Strophodonta demissa Hall, Nat. Hist. N. Y. Pal., vol. 4, pp. 81, 101, a 11, figs. 14-17; pl. 12, figs. 1-5. 1913. Sirephaadanks demissa Schuchert, Geol. Surv., Md. Low. Dev., p. 313, pl. 57, fig. 11. Description—The only specimen referable to this species, a pedicle valve, is not entirely preserved and the identification is somewhat uncertain. Shell of medium size, sub-circular in outline, regularly and strongly concave. The dimensions are: Length elt BRACHIOPODA. 233 22 mm., width 26 mm. Hinge line long and straight, and equal to the greatest width of the shell. Surface marked with prominent, radiating, nodose costae, which increase by bifurcation and present a somewhat bunched and uneven appearance. Remarks—This form has the general outline of Stropheodonta demissa Conrad, and the characteristic surface markings, but is more distinctly concave. Horizon—Lower beds. Figured specimens No. 27477 Walker Museum. Stropheodonta cf. inequiradiata Hall Plate 61, figures 19-20. 1887. Strophomena (Strophodonta) inequiradiata Hall, Tenth Rept. N. Y. State Cab. Nat. Hist., p. 113, figs. 1-3. _ 1861. Strophomena inequistriata Billings, Can. Jour. Sci, Arts, 6, p. 338, fig. 113. Geol. of Canada, 1863, p. 367, fig. 375, Pal. Fossils, 2, 1874, p. 24, fig. 13; pl. 2, fig. 4, p. 240. 1867. Strophcdonta inequiradiata Hall, Pal. N. Y. vol. 4, p. 87, pl. 11, figs. 24-31; pl. 12, fig. 12; pl. 13, figs. 6-11. Second Ann. Rept. N. Y. State Geol., 1883, pl. 45, figs. 13-14. Walcott, Mon. U. S. G. S., vol. 8, 1884, p. 120, pl. 11, fig. 11. 1892. Stropheodonta tnequiradiata Hall and Clarke, Nat. Hist. N. Y. Pal., vol. 8, pt. 1, pl. 14, figs. 13-14. Two pedicle valves of a Stropheodonia have been observed which bear a marked resemblance to this Onondagam:species. They are smaller than those figured in the New York reports, but exhibit the same semi-circular outline, high cays and the char- acteristic uneven and variable costae. Horizon—Upper beds. Figured specimens No. 27476 Walker Museum. Genus Leptostrophia Hall and Clarke Leptostrophia magnifica (Hall) Plate 62, figures 1-3. 1857, Strophodonta magnifica Hall, Tenth Ann. Rept, N. Y. State Cab. Nat. Hist., pl 54. 1859. Strophodonta magnifica Hall, Nat. Hist. N. Y. Pal., vol. 3, pp. 414, 482, pl. 93, fig. 4; pl. 94, figs. 2a-2d; pl. 95, fig. 8; pl. 95a, figs. 15-19. 1859. Strophodonta vascularia Hall, ibidem, vol. 3, p. 412, pl. 92, fig. 4; pl. 95, fig. 10 (not pl. 93, figs. 2b, 2c? S. magnivenira), 1861. 1861. Strophomena magnifica Billings, Can. Jour. Sci. Arts, vol. 6, p. 348. 1863. Strophomena magnifica Billings, Geol. Canada, p. 961, fig. 468. 1883. Strophodonta magnifica Hall, Second Ann. Rept. N. Y. State Geol., pl. 44, figs. 27-28. : 1892. Stropheodonta (Leptostrophia) magnifica Hall and Clarke, Nat. Hist. N. Y. Pal., vol. 8, pt. I, p. 288, pl. 13, figs. 27-28. 1900. Ramoatrophia magnifica Clarke, Mem. N. Y. State Mus., vol. 3, No. So; Pp. 55, D. 7, fig. 36. 1908. Te biosropbin magnifica Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, pp. 190- 191, pl. 38, figs. 1-2; pl. 39, figs. 9-10. 1913. Stropheodonta (Leptostrophia) magnifica Schuchert, Geol. Surv., Md. Low. Dev., p. 318, pl. 58, figs. 2-5. _Description—Shell varying in size from medium to large, more or less semi-oval in shape, cardinal extremities usually well rounded, width a little greater than length, 234 THE DEVONIAN OF MISSOURI. or in some examples the length and width equal. The pedicle valve of an average - sized individual measures 45 mm. from beak to anterior margin, and 50 mm. across the greatest width. The largest individual observed measures 75 mm. in length and 80 mm. in width. Pedicle valve regularly convex, without median sinus. Beak flattened, incon- spicuous, scarcely incurved over the hinge line. In the older individuals the surface of the shell in the pallial region is folded to form broad wrinkles. Large longitudinal muscle impressions are conspicuous in the casts of the interior, the divisions being marked off by distinct grooves, the whole scar fan-shape in outline. Brachial valve from flat to slightly concave. The surface of the vascular area is characterized by numerous pustulose elevations, irregularly arranged, and which be- come faint towards the margins. The impressions of the two adductor muscle scars are sub-reniform in outline, and are separated by a low, rounded ridge. The entire surface of both valves is marked by fine, radiating slightly flattened costae, with coarser concentric lines of growth crossing them. The costae vary con- siderably in size, and increase by bifucation and intercalation, the additions being most conspicuous a little below the beak. In exfoliated portions of the shell a distinct pitted structure is apparent, the pits arranged in longitudinal rows parallel to the striae. Remarks—This species occurs abundantly in the Little Saline limestone, and is repre- sented by separate valves only, pedicle valves and their casts being most frequent. The specimens agree closely with those from the Oriskany of New York and attain a similar size. Horizon—Lower and upper beds. Figured specimens No. 27474 Walker Museum. Leptostrophia magniventra Hall Plate 62, figures 4-5. 1857. -Strophodonta magniventra Hall, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist. p. 54. 1859. Strophodonta magniventra Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 411, pl. 92, figs. 2a-2c, 3; pl. 95, fig. 9, 1861. 1859. ?Strophodonta lincklaeni Hall, Nat. Hist. N. Y. Pal., vol. 3, pl. 93, fig. 2a (not figs. 3a, 3b==S. lincklaent). 1859. Strophodonta vascularia Hall, Nat. Hist. N. Y. Pal., vol. 3, pl. 93, figs. 2b, 2c - (not pl. 92, fig. 4; pl. 95, fig. 10—=S. magnifica) 1861. 1861. Strophomena magniventra Billings, Can. Jour. Sci. Arts, vol. 6, p. 349. 1863. Strophomena magniventra Billings, Geol. Can., p. 961, fig. 469. 1874. Strophomena magniventra Billings, Pal. Fossils, vol. 2, p. 22, figs. 10-12, pl. 2, figs. 2-2a. 1892. Stropheodonta (Leptostrophia) magniventra Hall and Clarke, Nat. Hist. N. Y. Pal., vol. 8, pt. 1, p. 288, pl. 13, figs. 25-26. 1900. Strasbeodonta eee Clarke, Mem. N. Y. State Mus., vol. 3, No. 3, p. 52, pli 7; fig: 31. 1913. Sho phendenes (Leptostrophia) magniventra Schuchert, oe Surv., Md. Low. Dev., p. 319, pl. 58, figs. 6-8. , Description—Shell elongate oval to semi-circular in outline, relative length and width variable. The dimensions of the only complete mature pedicle valve observed are: Length 41 mm., width 49 mm. The pedicle valve of a larger and probably older individual measures 50 mm. in length and approximately 60 mm. in width. Pedicle valve of medium convexity, the surface sloping gradually and uniformly to the lateral and anterior margins with no fold or sinus. Hinge line slightly less than the greatest width of the shell, the greatest width a little posterior to the middle of the Pee Nee eS ee BRACHIOPODA. 230 shell. Beak broad, rounded, but little incurved. Crenulations on hinge line obscure. Cardinal extremities obtuse. Surface marked with numerous, fine, rounded, radiating, bifurcating costae, which are separated by broader, flatter interspaces; in the middle of the shell 2 costae occupy the space of 1mm. An exfoliated portion of the shell shows the elongate-oval adductor muscle impressions, and the large, plicated fan-shaped diductor muscular markings. Hall describes the brachial valve as follows: “Dorsal valve (of this species) deeply concave, radiatingly striated, the striae finer than those of the ventral valve. The in- terior of the valve is marked by well-defined muscular areas; and outside of these the vascular and ovarian spaces occupy a large part of the shell, having a well-defined semi- elliptical area of a width little greater than the length, and somewhat contracted at the cardinal angles. The margin outside of the vascular area is striate-punctate.’’—Hall, 1859. Remarks—One complete pedicle valve and three imperfect. ones have come under my observation. None of the specimens show the elongated hinge line which character- izes some of the New York specimens. Swartz says: ‘‘Stropheodonta magniventra is easily distinguished from all associated Stropheodonta by its external ornamentation, i. e., by the few widely separated obscure striae on the ventral valve, and by the very delicate and exceedingly numerous striae of the dorsal valve. Another feature is the very high ventral cardinal area.”"—Swartz, 1913. Horizon—Lower and upper beds. Figured specimens No. 27473 Walker Museum. Genus Brachyprion Shaler Brachyprion cf. majus Clarke Plate 62, figures 6. 7. 1874. Strophomena inequiradiata Billings, Pal. Fossils, vol. 2, pt. 1, p. 24 (not fig. 13), pl. 2, fig. 4. 1900. ekehusricn majus Clarke, Mem. N. Y. State Mus., vol. 3, p. 54, pl. 8, figs. 8-13. 1908. Brachyprion majus Clarke, tes N. Y. State Mus., vol. 9, pt. 1, p. 190, pl. 36, figs. 1-6. Description—Shell of medium size, semi-circular to semi-elliptical in outline; length greater than width. The dimensions of the separate brachial and pedicle valves of different individuals are: Length 20 mm., width 28 mm., and length 16 mm., width 22mm. The hinge line equals the greatest width of the shell, and is finely denticulate for about half its length. Pedicle valve moderately convex, umbonal region broad and sloping abruptly to the posterior margin. Beak slightly elevated, flattened and incurved over the hinge line. Cardinal extremities sharply defined. An interior of the brachial valve shows the valve to be maderstcly concave with a well defined mesial sinus which broadens a little toward the anterior margin. The surface exhibits a regularly marked pustulose character. Surface of both valves marked by fine, radiating, irregular costae. These vary in size and increase by interstitial addition and by bifurcation, producing a fasciculate ‘appearance. These are crossed by fine, concentric markings which have been poorly preserved in the specimens observed. Remarks—The species is sparingly represented by one doubtful pedicle valve, and the internal casts of a few brachial valves. The form bears a stronger resemblance to Brachyprion majus Clarke of the Grand Greve limestone, Quebec, Canada, than to the same species in the Oriskany of Becraft mountain, New York. Inthe apparently mature forms the irregularity of the surface markings still persists giving the fasciculate appear- 236 THE DEVONIAN OF MISSOURI. ance, while in the New York specimens this is a feature of the immature forms only. The Little Saline specimens are considerably smaller than those from Quebec. Horizon—Lower beds. Figured specimens No. 27472 Walker Museum. Brachyprion sp. Plate 62, figures 8-10. Description—Shell small, semi-circular to elongate oval. The dimensions of two brachial valves are: Length 12 mm., width 13 mm., and length 10 mm., width 11 mm. ‘Brachial valve deeply concave, hinge line straight, cardinal extremities rounded. | The hinge line is finely crenulated, the crenulations extending over half the distance to the extremities. A cast of the interior shows the well-defined crural process, and the pustulose character of the surface. Exterior marked by numerous, irregular and unequal ; costae which are crossed by coarser concentric lines of growth. Pedicle valve unknown. 5 Remarks—Impressions of the exterior of the brachial valve, and casts of the interior of the same valve have been observed. The species seems to be distinct from Brachyprion schuchertanum Clarke in that it is proportionately smaller and longer. Horizon—Lower beds. - Figured specimens No. 27471 Walker Museum. Genus Schuchertella Girty Schuchertella sp. Plate 62, figure 11. Description—Shell of medium size, transversely elliptical, broader than long. The dimensions of a brachial valve are: Length approximately 31 mm., width 48 mm., the hinge line equal to the greatest width of the shell. Pedicle valve moderately convex, the maximum convexity anterior to the umbonal region. From the middle, the surface the shell slopes toward the cardinal extremities in a manner to form a gently concave area upon each side. Surface marked by fine radiating costae, which increase by interstitial addition, there being about 20 in the space of 1 mm. ; - Remarks—One incomplete pedicle valve only occurs which is not certainly deter- minable. : Horizon—Lower beds. Figured specimen No. 27470 Walker Museum. Family Productidae Genus Anoplia Hall and Clarke Anoplia nucleata (Hall) . Plate 63, figure 5. 1857. Leptaena nucleata Hall, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist., p. 47. 1859. Leptaena nucleata Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 419, pl. 94, figs. 1a-1d, 1861. 1892. Anoplia nucleata Hall and Clarke, ibidem, vol. 8, pt. 1, p. 309, pl. 15a, figs. 17, 18; pl. 20, figs. 14-17. 1903. Anoplia nucleata Weller, Geol. Surv., N. J. Pal., vol. 3, p. 325, p. 41, fig. 9; p. 349, pl. 46, figs. 8-10. 1908. Anoplia nucleata Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, p. 211, pl. 41, figs. 15-17. BRACHIOPODA.. 237 1913. Anoplia nucleata Schuchert, Geol. Surv. Md. Low. Dev., p. 340, pl. 61, figs. 22-24, A single internal cast of a pedicle valve is the only specimen representative of this common Oriskany brachiopod. The dimensionsare: Length 3 mm., width approxi- mately 4 mm. The valve is extremely gibbous and exhibits the characteristic groove in the beak which extends almost to the middle of the shell.’ Surface features not preserved. Horizon—Upper beds. Figured specimen No. 27469 Walker Museum. Genus Chonostrophia Hall and Clarke Chonostrophia complanata (Hall) Plate 63, figures 6-7. 1857. Chonetes complanata Hall, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist., p. 56. 1859, Chonetes complanata Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 418, pl. 93, fig. 1, 1861. 1892. Chonostrophia complanata Hall and Clarke, ibidem, vol. 8, pt. 1, p. 311, pl. 16, figs. 13-29. 1900. Chonostrophia complanata Clarke, Mem. N. Y. State Mus., vol. 3, No. 3, p. 50, ; pl. 7, figs. 1-13. 1908. Chonostrephia complanata Clarke, N. Y. State Mus., Mem. 9, pt. 1, p. 210, pl. 46, figs. 6-13, 1913. Chonostrophia complanata Schuchert, Geol. Surv., Md. Low. Dev., p. 341, pl. 62, figs. 1-2. Description—Shell of medium size, broadly semi-circular in outline. The dimensions of an average sized pedicle valve are: Length 20 mm., width 24mm. Another pedicle valve with a proportionately longer hinge line measures 17 mm. in length and 31 mm. in width. Hinge line equal to the greatest width of the shell; cardinal extremities acute. Pedicle valve concave to nearly flat, slightly convex in the umbonal region, be- coming gently concave toward the margins. Cardinal margin marked with a row of spines inclined towards the extremities on either side of the beak. Latter small, slightly incurved, scarcely elevated above the hinge line, apex pierced by a round foramen. The interior of the valve shows the strongly defined pustulose character of the surface. On the exterior are fine, radiating, bifurcating costae, which are crossed by indistinct concentric lines of growth. In some cases minute concentric striae are preserved. Remarks—This species is represented abundantly in the Little Saline beds by ie exteriors and interiors of the pedicle valves, but in none of them are the cardinal spines well preserved. The specimens are generally smaller than in the New York Oriskany, resembling in this respect those from the Becraft mountain Oriskany, and those from the Grand Greve limestone, Gaspe, Quebec. Horizon—Lower and upper beds, Figured specimens No. 27468 Waiker Museum. Order Telotremata Superfamily Rhynchonellacea Family Rhynchonellidae Genus Eatonia Hall Eatonia peculvaris (Conrad) Plate 62, figures 12-16. 1841. Atrypa reticularis Conrad, Geol. Surv., N. Y. Fifth Ann. Rept., p. 56. 1859, Hatonia peculiaris Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 244, pl. 38, figs. 21-26; pl. 101, figs. 2a—g; pl. 101, fig. 2; pl. 101a, fig. 1. 238 THE DEVONIAN OF MISSOURI. 1874. Eatonia pecularis Billings, Pal. Fossils, vol. 1, pt. 2, p. 40, pl. 3a, fig.-2, a-c. 1894, Eatonis pecularis Halland Clarke, Nat. Hist. N. Y. Pal., vol. 8. pt. 2, pl. 61, figs. 17-26. 1908. Eatonia pecularis Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, p. 172, pl. 29, figs. 1-13. 1913. Eatonts pecularis Schuchert, Geol. Surv., Md. Low. Dev., 2 372, pl. 65, figs. 23-28. Description—Shell commonly small, and a little longer than scicdes but in some speci- » mens the length and breadth are the same. An average individual measures 17 mm. in length, and 15 mm in width. The dimensions of the largest specimen observed are: Length 25 mm., width 22 mm. Shell distinctly ovate in outline, the cardinal margins diverge from the beaks and form a flattened oval area on each side of the shell. _ Pedicle valve depressed convex posteriorly from the middle of the shell toward the beak, but gently concave toward the margins of the cardinal slopes, where it be- comes abruptly inflected. Anteriorly the valve is prolonged into a long ieee extension. . Brachial valve convex, the surface sloping abruptly to the lateral margins. To- ward the anterior margin the middle is elevated into a fold. Margins of both valves serrated, the serrations on the brachial more prominent than those on the pags valve. Surface of entire shell covered with fine, bifurcating striae, 5 to 6 of which occupy’ the space of 1 mm. Remarks—This form, next to the Spirifers, is perhaps the most dude fossil in the Little Saline beds, and it is the only species which occurs commonly with the two valves in articulation, complete specimens being found in a splendid state of preserva- tion. Many of the shells are larger than those from the Oriskany beds of New York, and resemble rather in size those from the Grand Greve limestone of Gaspe, Canada, exhibiting a similar variation in shape and size. This species is characterized by the linguiform projection of the anterior margin, the strong inflection of the pedicle valve along the cardinal slopes, and the serrated margins of the valves. Horizon—Lower and upper beds. Figured specimens No. 27467 Walker Museum. Eatonia plicata sp. nov. Plate 63, figures 1-4. Description—Shell small, relative length and width variable, although the length is commonly greater than the width. The holotype which is an average-sizéd individual measures 13 mm. in length and 11 mm. across its greatest width which is slightly anterior to the middle of the shell. The form is elongate oval in outline, with the cardinal margins converging abruptly to the beak. Anterior margin serrated. Pedicle valve depressed convex in the umbonal region, and flattening out towards the middle into a sinus which is prolonged into a long linguiform extension of the anterior margin. Toward the lateral margin the shell becomes inflected somewhat abruptly. Umbonal region scarcely differentiated; beak small, acute, incurved slightly, the apex pierced by a round foramen. Brachial valve rather highly convex; near the anterier margin the middle becomes elevated into'a fold. Umbonal region arched; the beak larger than in the opposite valve and more rounded. Surface of both valves marked by simple radiating, coarse, angular plications, from 16 to 18 present on each valve, which are separated by deep narrow interspaces. The BRACHIOPODA. : 239 plications increase rapidly in size toward the anterior margin. Near the postero-lateral margins the last two or three become obsolete. Remarks—The exteriors of the separate valves occur. This species differs from Eatonia peculiaris Conrad, in its smaller size, in the presence of coarse angular plica- tions, in the more broadly extended pedicle valve, and in the sharper mesial fold of the brachial valve. Horizon—Lower beds. Holotype and Paratypes No. 27466 Walker Museum. Genus Uncinulus Bayle Uncinulus parvus sp. nov. Plate 63, figures 11-12. Description—Shell small, sub-pentagonal in outline, length and width nearly equal, the postero-lateral margins meeting at the beak in an angle of 90 degrees or a little less. The dimensions of a perfect specimen, the hologype, are: Length 17 mm., width 17.5 mm., the greatest width midway between the beak and anterior margin. ee Ee ereniities rounded. Pedicle valve moderately convex, the most A convexity in the region of the umbo; depressed anteriorly into a broad ill-defined sinus. Beak,small, acute, elevated over the beak of the opposite valve. Brachial valve a little more convex than the pedicle, elevated anteriorly into a scarcely perceptible mesial fold; beak incurved below that of the other valve. Surface of each valve marked by about 18 simple, rounded plications, which become obsolete in the umbonal region, 6 of them included in the fold and sinus. Fine con- centric striae and irregular lines of growth cross the plications. Lateral and anteriors margins of contact sharply serrated. Remarks—Only one entire specimen of the above species, the holotype, has come under observation, but a separate pedicle valve is doubtfully referred to the same species. The species has been observed only in the upper beds, and is distinct from all the other Uncinulae present because of its small size, and the slight development of the fold and sinus. For these reasons one cannot be reasonably sure that it is a mature individual. The form resembles somewhat closely the figured specimen of Uncinulus. convexorus! Maynard, fig. 14, but is entirely dissimilar to figs. 9-13 of the same species on which presumably the description is based. ‘ Horizon—Upper beds. Holotype No. 27463 Walker Museum. iMaynard, T. P., Geol. Surv., Md. Low. Der., pl. 65, figs. 9-14. Uncinulus salinesis sp. nov. Plate 63, figures 8-10 Description—Shell of medium size, sub-pentagonal in outline; width slightly greater than the length. The dimensions of the holotype are: Length 32 mm., width 35 mm., the maximum width anterior to the middle of the shell. The lateral margins conspicu- ously flattened and sharply serrated. The postero-lateral margins slope abruptly to the beaks, and are gently concave forming oval areas. Pedicle valve depressed convex in the umbonal region, gradually flattening out to form a broad shallow sinus at the anterior margin, which projects in a linguiform ex- tension, fitting into the mesial fold of the opposite valve. The surface slopes gradually to the lateral margins, where it turns abruptly forming a sharp angle, and meeting the brachial valve’at right angles. Beak triangular, with acute apex, and apparently a 240 THE DEVONIAN OF MISSOURI. little elevated above the opposite. A cast of the interior shows a broad shallow de- pression extending half way to the anterior margin. Brachial valve larger than the pedicle, and strongly convex to gibbous. Near the anterior margin it is elevated into a broad, sharply defined fold. At the lateral margins the shell becomes abruptly inflected, forming a flat area corresponding to a similar one on the other valve. Surface of each valve marked with about 40 angular plications, the last two or three near the hinge becoming almost obsolete. Ten of the plications occupy the sinus. Indistinct concentric lines of growth are present. Remarks—Two specimens referable to this species have been observed, one a nearly complete individual, the other a cast of the interior of the pedicle valve. Horizon—Lower beds. Holotype and Allotype No. 27464 Walker Museum. Uncinulus welleri sp. nov. Plate 63, figures 13-14. Description—Shell of medium size, elongate oval, sub-pentagonal in outline. The dimensions of the holotype are: Length 30 mm., width 27 mm. Some specimens are larger, as much as 35 mm. in length, and 30 mm. in width. Shell characterized by flat and serrated lateral margins, and by gently concave postero-lateral margins which slope steeply to the beak. Pedicle valve arched in the umbonal region, becoming strictly concave toward the anterior margin and forming a broad shallow sinus which becomes extended into a linguiform projection. Lateral margins inflected, forming flat lateral areas. Beak small, and incurved closely over that of the opposite valve. Brachial valve highly convex, the anterior margin elevated into a scarcely percep- tible fold. Toward the lateral margins the shell surface slopes abruptly, forming con- tinuous flat areas with those produced by the inflection of the opposite valve. Beak sharply pointed, incurved below the other. Surface of both valves marked with 40 to 50 simple angular plications, which are separated by deep, narrow furrows. Seven plications occupy the sinus. Remarks—Only a few examples of this species have been observed. It may be dis- tinguished from Uncinulus salinensis by its more elongate form, and by the less promi- nent fold and sinus. The species resembles Uncinulus nobilis Hall from the Helder- bergian of New York, and may be a later development of that form, but it differs in being larger, in having a greater number of plications, and a flatter and less sharply marked mesial sinus. Horizon—Lower beds. Holotype and Paratype No. 27465 Walker Museum. Name—This fossil has been named after Professor Stuart Weller, of the Depart- ment of Paleontology, University of Chicago. Genus Plethorhyncha Hall and Clarke Plethorhyncha barrandii (Hall) Plate 63, figures 15-16. 1857. Rhynchonella barrandw Hall, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist., p. 82, figs. 1-3; pl. 84, fig. 4. 1908. Plethoryncha barrandii Clarke, Mem. M. Y. State Mus., vol. 9, pt. 1, p. 171, pl. 28, figs. 16-17. 1913. Cancels (Plethoryncha) barrandti Schuchert, Geol. Surv., Md. Low. Dev. zn p. 359, pl. 64, figs. 2-3. Et ea Sa BRACHIOPODA. 241 Description—Shell large, sub-oval in outline, strongly convex, length usually greater than the width. A medium sized brachial valve measured 53 mm. in length and 40, mm. in width. The dimensions of the pedicle valve of another individual are: Length 45 mm., width 36 mm., the greatest width anterior to the middle of the shell. The lateral margins of both valves are conspicuously flattened. Pedicle valve depressed convex, the greatest convexity just below the umbonal region. Near the anterior margin a broad shallow sinus is developed. Whether this is extended into a linguiform projection as described by Hall cannot be ascertained from the imperfect material at hand. The sides of the sinus curve upwards forming sharp lateral margins, the sides of which slope abruptly to meet the opposite valve. Beak pointed and only slightly incurved. Brachial valve convex to gibbous. The shell surface slopes uniformly from the middle towards the lateral margins, then turns abruptly, meeting the other valve at right angles. Beak incurved more than that of the pedicle valve. Surface of each valve marked with about 40 radiating, angular plications, and several indistinct ones near the postero-lateral margins. Intervening spaces narrow. Remarks—A limited number of separate valves have come under observation. They are distinguished from the other species of Plethorhyncha with which they are associated by their larger size, and their coarser plications. With the exception of one fragment none of the specimens attain the proportions of the larger New York speci- mens. Horizon—Lower beds. Figured specimens No. 27461 Walker Museum. Plethorhyncha princtpalis (Hall) Plate 64, figures 1-3. 1856. Rhynchonella principals Hall, Regents Rept., p. 84, Paleozoic Fossils, 1857, p. 44. 1859. Rhynchonella principalis Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 443, pl. 106, fig. 4, Description—Shell large, elongate oval, relative length and width variable. The dimensions of an average sized pedicle valve are: Length 45 mm., width 38 mm., the greatest width anterior to the middle of the shell. Pedicle valve depressed convex, arched in the umbonal region, in some specimens forming a broad median ridge, the surface gradually flattening out toward the anterior margin to form a broad, shallow sinus. The shell surface slopes uniformly from the middle and forms sharp, lateral margins as it becomes abruptly inflected to produce flat, lateral areas. Beak flat, acute, slightly incurved. Brachial valve convex to gibbous, flattening somewhat towards the anterior margin. Lateral margins abruptly incurved to meet the opposite valve at right angles. Beak arched and incurved more strongly than the beak of the pedicle valve. Surface of each valve marked with from 60 to 80 radiating plications, which are exceedingly fine near the beak. _ These are crossed by faint, concentric growth lines. Remarks—This species occurs abundantly in the Little Saline limestone, and is commonly represented by somewhat fragmental separate valves. This species is closely allied to Plethoryncha barrandii Hall, and in many cases it is almost impossible to draw a line of demarcation between the two species, one grading imperceptibly into the other. In general, however, this species may be distinguished by its smaller size, by the finer plications, and by the proportionately broader brachial valve. Horizon—Lower and upper beds. Figured specimens No. 27460 Walker Museum. 242 THE DEVONIAN OF MISSOURI. Superfamily Terebratulacea Family Centronellidae Genus Centronella Billings Centronella glansfagea (Hall) Plate 64, figures 4-7. : 1857. Rhynchonella glansfagea Hall, N. Y. State Cab. Nat. Hist., Ba ‘Kh ai Pit p. 125, figs. 1-6. 1867. Centronella glansfagea Hall, Nat. Hist. N. Y. Pal., vol. 4, p. 399, ol. 61a, figs. 1-21, 25-26. 1908. Centronella glansfagea Clarke, Mem. N..Y. State Mus., vol.-9, pt. 1, p. 163, pl. 25, figs. 1-4. Description—Size of shell variable, small to medium, sub-quadrate or ,spoon- shaped, the cardinal margins sloping abruptly to the beaks; length greater than the width, the maximum width about midway between the beak and anterior margin. The dimensions of two different individuals are: Length 20 mm., width 14 mm. and length 14 mm., width 10 mm. Pedicle valve larger than the brachial, convex, usually sub-carinate along the middle, the surface sloping steeply to the lateral margins. Beak considerably elevated above that of the opposite valve, abruptly curved, and extended in a horizontal plane so that the apex lies well beyond the brachial valve. Brachial valve smaller than the pedicle, depressed convex, towards the anterior margin becoming flatter and forming a faintly defined mesial sinus which includes the entire width of the shell. A small extremely carinated specimen shows a well defined sinus extending from beak to anterior margin. Beak small, incurved below the opposite. Surface smooth, shell substance very finely punctate. The concentric lines of growth are especially prominent on the brachial valve. Remarks—The few specimens studied seem to be fairly constant in their char- acters, and show no marked deviation from the New York examples. Horizon—Upper beds. - Figured specimens Ne. 27507 Walker Museum. Genus Rensselaria Hall Rensselaeria: cvoides (Eaton) Plate 64, figures 8-12. 1832. Terebratula ovoides Eaton, Geological Textbook, p. 45. 1859. Rensselaeria ovoides Hall, Nat. Hist..N. Y. Pal., vol. 3, p. 456, pl. 104, sae 1-4; pl. 105, figs. 1-6. 1900. Rensselaeria ovoides Clarke, Mem. N. Y. State Mus., vol. 3, No. cae p. 39, pl. 5, figs. 17-19. Dasmenai on alls varying in size from medium to large, but in no case do they attain the large proportions of the New York examples. Some specimens are extremely gibbous, others less so. Both valves are incurved toward the lateral margins, and pro- duce a conspicuous flattening of the shell. There is a distinct variation from elongate- oval or spatula-shaped gibbous forms to shorter and less gibbous ones. An average mature specimen is considerably longer than broad and measures about 62 mm. in length, and 40 mm. across its greatest width which is well above the middle of the shell. The dimensions of a smaller individual, and this size seems to be abundant, are: Length 35 mm., width 20 mm. BRACHIOPODA. 243 Pedicle valve commonly strongly convex transversely, the greatest convexity in the region of the greatest width. Shell surface sloping uniformly from the middle to- wards the lateral margins to near the edge where it becomes abruptly inflected, and bends almost at right angles toward the other valve. Beak fairly high, closely in- curved over the umbo of the opposite valve. Brachial valve less convex than the pedicle, the surface sloping more gently to the lateral margins, but near the edge being deflected in a similar manner. Beak less ele- vated than the beak of the pedicle valve. Surface of both valves marked by fine, radiating costae, 3 occupying the space of 1 mm. These are crossed by conspicuous concentric growth lines, which show clearly the outline of the shell at various ages. Remarks—This species which occurs abundantly in the Little Saline limestone, is represented by both entire specimens and by the separate valves. Due to the condi- tion of preservation the punctate shell structure so characteristic of this genus has not been observed in any of the specimens studied. The species is distinguished by the ’ distinct spatula-shaped shell, the high convexity of both valves particularly the pedicle, and the flattened character of the lateral margins in mature individuals. Horizon—Lower and upper beds. Figured specimens No. 27506, Walker Museum. Rensselaeria cf. stewarti Clarke Plate 64, figures 13-15 1907. Rensselaeria stewarts Clarke, Mem. N. Y. State Mus. No. 107, p. 239. 1908. Rensselaeria stewart: Clarke, Mem. N. Y. State Mus. No. 9, pt. 2, p. 38, pl. 7, figs. 10-20. eS Descriptton—Shell of medium size, usua!ly broader than long, semi-circular in out- line. An average individual measures 29 mm. in length and 31 mm. in width. Hinge line equal tothe greatest width. ‘Cardinal margins sloping abruptly from the beaks, and terminating in rounded extremities. Pedicle valve convex, the maximum convexity in the umbonal region, from which the surface slopes uniformly, gradually flattening out toward the anterior and lateral margins. Reak high, triangular, incurved over the hinge line. Surface marked with simple radiating plications, these gradually diminish in size toward the posterior margin until well above the middle of the shell they become obscure and apparently disappear. In some specimens the plications persist throughout the whole length of the shell. In general one plication occupies the space of 1 mm., at the anterior margin. Posterior to the middle, there are two and sometimes even three in 1mm. The plications are crossed by coarser, concentric growth lines. Remarks—This species is represented by the exteriors of the pedicle valve. It resembles Rensselaeria stewarti Clarke, from the Dalhousie beds of New Brunswick, Canada, but has a less convex pedicle valve, and a less prominent umbonal region. The species also resembles Rensselaeria atlantica Clarke, which occurs in the Chapman sandstone immediately above the Dalhousie beds and it may prove to be more closely allied to this form than to the former. Since many of the Little Saline species are identified with forms in the Grand Greve limestone which is a higher horizon than the Chapman, it would seem plausible that the present form may agree more closely with the form in the higher horizon. ; - Horizon—Lower and upper beds. Figured specumens No, 27505, Walker Museum. 244 THE DEVONIAN OF MISSOURI. Genus Beachia Hall and Clarke Beachia suessana (Hall) Plate 64, figures 16, 17 1857. Meganteris suessana Hall, Tenth eae Rept. N. Y. State Cab. Nat. Hist. - De 100. 1859. Rensselaeria suessana Hall, Nat. Hist. N. Y. Pal. vol: 3, p. 459, pl. 107, figs. 1-15, 1861. 1913. Rensselaeria (Beachia) suessana Schuchert, Geol. Surv., Md. Low. Dev.;p. 387, pl. 67, figs. 7-15. Rancepaae= shel of medium size, a little longer than wide, elongate oval in outline, both shape and size being somewhat variable. The dimensions of an average sized indi- vidual are: Length 27 mm., width-25 mm., the-greatest width well below the hinge line. Posterior margins sloping somewhat abruptly from the beaks, and terminating in rounded cardinal extremities. Lateral margins of both valves abruptly inflected. Pedicle valve moderately convex, the greater convexity across the middle of the shell. From the median line the shell slopes uniformly to the margins. Beak small, angular, and well elevated above the opposite valve; apex pierced by a round foramen. Brachial valve about equally convex with the pedicle, the beak small, incon- spicuous, and incurved slightly. The radiating markings which characterize Beaskas suessana Hall, from the New York Oriskany seem to be almost always absent in the specimens studied, probably due to the condition of preservation, but a few obscure ones have been noticed. Concentric growth lines mark the shells, these being most prominent near Ge anterior margin. Punctuate shell structure poorly preserved. Remarks—Entire specimens and the separate valves occur. These correspond closely to Beachia suessana Hall, but differ in having more distinctly rounded anterior margins. There is also a close resemblance to Beachia amplexa Clarke, from the Grand Greve limestone of the Gaspe region, but all the specimens which have come under observation are considerably smaller than the former. This species in characterized by the inflected lateral margins, and the depressed convex valves. ; Horizon—Lower beds. Figured specimens No. 27504, “Walker Museum. : . Beachia ovalis (Hall) Plate 65, figure 1 1857. Meganteris ovalis Hall, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist., p. 101. 1859. Rensselaeria ovalis Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 458, pl. 106, fen 2a-l, 1861. 1913. Rensselaerta (Beachia) ovalis Schuchert, Geol. Surv., Md. Low. Dev., p. 389, pl. 67, figs. 17-19. Description Shell longitudinally ovate, with a well-rounded anterior margin. The dimensions of an nearly perfect specimen are: Length 42 mm., width 36 mm.,; the great- est width anterior to the middle of the shell. Lateral margins of both valves stroeely inflected. Pedicle’ valve depressed convex, the most prominent depression along the middle. Beak well elevated above the hinge line and over the beak of the opposite valve. Brachial valve about equally convex with the pedicle, but less prominent along the middle. Beak lower than that of the opposite valve and incurved below it. The simple, radiating costae, which are characteristic of the New York specimens have not been observed. Due to the absence of the original shell surface and the punc- tate shell-structure has also been destroyed. * ae ii - _ BRACHIOPODA. 245 Remarks—Only one imperfect specimen occurs in the collection. In contrast with the New York specimens it has a more broadly extended anterior margin, and more acute cardinal angles. Horizon—Lower beds. Figured specimen No, 27503, Walker ibiashains Superfamily Spiriferacea Family Atrypidae Genus Atrypa Dalman Airypa reticujaris (Linne) Plate 65, figure 2 1767. Anomia reticularis Linne, Systema Naturae, ed. 12, tome i, p. 1132. : 1852. Altrypa reticularis Hall, Nat. Hist. N. Y. Pal., vol. 2, p. 72, pl. 23, fig. 8; pl. 270. pl. 55, fig. 5: 1913. Altrypa reticularis Maynard, Geol. Surv., Md. Low. Dev., p. 393, pl. 67, figs. 26-28. This very common Silurian and Devonian brachiopod has not been found in the lower beds of the Little Saline limestone. It is represented in the upper beds by a few imperfectly preserved brachial valves.. The dimensions of the largest valve observed are: Length 30 mm., width 29 mm. Other examples are considerably smaller. The valves are moderately convex, and the surface is marked by radiating costae which in- crease by intercalation. These are crossed by concentric lamellae, usually indistinctly preserved, and giving the characteristic reticulated or decussated appearance. The characters of the few specimens observed seem to be fairly constant. Horizon—Upper beds. Figured specimen No. 27502, Walker Museum, Family Spiriferidae Genus Spirifer Sowerby Spirifer arenosus (Conrad) Plate 65, figures 6-8 1839. Dethyris arenosus Conrad, Third Ann. Rept. N. Y. Geol. Surv., p. 65. 1859. Spirifer arenosus Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 425, pl. 98, figs. 1-8; pl. 99, figs. 1-10; pl. c, figs. 1-8. 1908. Spirifer arenosus Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, p. 179, pl. 33, figs. 1-10. 1913. Spirifer arenosus Schuchert, Geol. Surv., _ Md. Low. Dev., P. 415, pl. 71, figs. 1-9; pl. 72, fig. 1. Deicriphion— Shell attaining large size, usually broader than igen The dimensions of an average individual are: Length 50 mm., width 60 mm. Umbonal region wide, beak considerably elevated above the hinge line; in the younger forms this elevation is not so conspicuous. The cardinal extremities in the older individuals commonly well rounded. Pedicle valve convex, with a wide shallow mesial sinus, which is almost obsolete, in some specimens being little more than a flattening of the surface along that part of the shell. At the apex it includes a single plication, which dichotomizes, until at the anterior margin it is occupied by 5 or 6 plications. Brachial valve about equally convex with the pedicle. It is characterized by a mesial fold, which presents a more prominent feature than thesinus. The fold startsasa 246 THE DEVONIAN OF MISSOURI. single plication near the apex, which dichotomizes until at the margin it is represented by 5 or 6 plications. Surface on each side of the fold and sinus marked by 15 to 20 broad, flattened, simple ribs, separated by flat interspaces. The ribs decrease in size as the cardinal margins are approached. Remarks—This common Oriskany species occurs abundantly in the Little Saline limestone. The plicated fold and sinus are a distinguishing characteristic of the species. The shells do not display so great variability as does the associated Spirifer murchisoni and there seems to be no important differences from the New York examples. Horizon—Lower and upper beds. Figured specimens No, 27501, Walker Museum. Spirifer murchisoni Castelnau Plate 65, figures 9-11 1843. Spirsfer murchisoni Castlenau, Essai Syst. Sil. l’Amer. Septent., p. 41, pl. 12, oe figs daz: : 1859. Spirifer arrectus Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 422, pl. 97, figs. 1a-1h, 2a-ai, pl. 430, 1861. 1908. Spirifer murchisoni Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, pl. 177, pl. 32, figs. 1-10. 1913. Spirsfer murchisoni Schuchert, Geol. Surv., Md. Low. Dev., p. 411, pl. 70, figs. 1-5. Description—Shell of medium size or larger, width greater than length, the greatest width along the hinge line. The most common type is a rather broadly extended shell, with regular curving sides. The dimensions of a complete individual are: length:25 mm., width 45 mm. Pedisle valve convex, characterized by a Fairley wide, shallow, mesial sinus, which flattens out toward the anterior margin. Brachial valve equally convex with the pedicle, the middle portion elevated into an acute fold; beak incurved beyond the hinge line. Eight or nine strong, regularly rounded plications, with two or three indistinct ones near the cardinal angles are present on each lateral slope of the valves. The inter- vening grooves are also rounded. Surface ornamented by fine, closely arranged, radiat- ing striae, which are crossed by concentric striae. Remarks—The separate valves usually occur, entire individuals are uncommon. The shells exhibit considerable variation in the size, width and depth of sinus, height of fold, angularity and strength of plications, but these differences do not seem to be constant enough to warrant a division into separate species. In general the Little Saline specimens correspond with the same species occurring in the Grand Greve lime- stone of the Gaspe region. Horizon—Lower and upper beds. Figured specomens No. 27500, Walker Museum. Spirifer cf. varicosa Hall Plate 65, figure 12 1857. Spiriier varicosa Hall, Tenth Rept. on the State Cab., p. 130. 1867. Spirifer varicosa Hall, Nat. Hist. N. Y. Pal., vol. 4, p. 205, pl. 31, figs. 1-4. Description—Two Reaswieatay brachial valves have been SieeRgeA which may be compared with this Onondagan species. The strongly elevated mesial fold with flattened summit, and the characteristic surface markings constitute the distinguishing marks of the species. Horizon—Upper beds. Figured specimens No. 27499, Walker Museum. ee BRACHIJOPODA. 247 Genus Metaplasia Hall and Clarke cf. Metaplasia pyxidata Hall Plate 65, figure 14 1859. Spirifer pyxidata Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 428, pl. 100, figs. 9-12, a. 1861. 1913. Metaplasia pyxidata Schuchert, Geol. Surv., Md. Low. Dev., p. 422, pl. 72, figs. 11-12. Description—Shell small, length less than the width, the hinge line equal to the greatest width of the shell; sub-elliptical in outline. The dimensions of a pedicle valve are: Length 6 mm., width approximately 7 mm. Pedicle valve highly convex, elevated along the middle line into a pronounced median fold with narrow sinus along the summit. Beak prominent, blunt and incurved. Sur- face essentially smooth. ~ Remarks—The pedicle valve of a small brachiopod resembles this species some- what closely, but since there is nothing’ present in the collection to represent the brachial valve, and since the specimen is incomplete no certain identification can be made. This specimen studied differs from the figured specimens from New York and Maryland. (1) in being considerably smaller, (2) in having a more prominent beak, (3) in having steeply sloping postero-lateral margins, and (4) in having a total absence of surface striations. Hortzon—Upper beds. Figured specumen Nc. 27498, Walker Museum. Family Suessidae Genus Cyrtina Davidson Cyrtina rostrata Hall Plate 65, figure 13 1857. Cyrtia rostrata Hall, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist., p. 64. 1859. Cyrtia rostrata Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 429, pl. 96, figs. 1-6; pl. 98, figs. 8a-8b, 1861 tae 1908. Cyrtina rostrata Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, p. 183, pl. 31, figs. 25-28. 1913. Cyrtina rostrata Schuchert, Geol. Surv., Md. Low. Dev., p. 423, pl. 71, figs. 10-16. Description—The only example at hand is an incomplete brachial satu which un- doubtedly belongs to this species. Shell small, semi-circular in outline. The dimensions are: Length 10 mm., width approximately 17 mm., the hinge line being equal to the greatest width of the shell. Shell almost flat, or depressed convex, with a conspicuously marked, slightly flattened mesial fold, which increases in width from the beak to, the anterior margin. Beak small and incurved a little over the hinge line. The surface on each side of the fold is marked with 6 or 8 radiating plications, which are crossed by finer, concentric, sharply zigzag lines. Remarks—Sufficient portion of the brachial valve is present to demonstrate the outstanding features of this species—the semi-circular outline of the shell, the long, straight hinge line, and the coarse, radiating plications. Horizon—Lower beds. Figured specimen No. 27495, Walker Museum. 248 THE DEVONIAN OF MISSOURI. Family Rhynchospiridae Genus Rhynchospira Hall Rhynchospira attenuata sp. nov. ' Plate 65, figure 3 ; Descrittion—The collection contains a single nearly complete pedicle valve of a Rhynchospira, which belongs to an undescribed species. Shell of medium size, longi- tudinally subovate, postero-lateral margins converging gradually to the beak. The dimensions are: Length 14 mm., width 11 mm. Beak elongate, acute, apex perforated by a round foramen. Surface marked by 10 to 12 simple, coarse, angular plications. . Brachial valve unknown. : Remarks—This form is unlike any described species of the genus in the extremely elongate and attenuate beak, and the more coarsely plicate surface. Horizon—Upper beds. Holotype No. 27497, Walker Museum. Trematospira multistriata (Hall) Plate 63, figures 4, 5 1857. Spirifer multistriata Hall, Tenth Acie Rept. N. Y. State Cab. Nat. Hist., p. 59, figs. 1-6. 1859. Trematospira multistriata Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 209, pl. 24, figs. 3a-3f; pl. 28a, figs. 5a-5f. 1900. Trematospira multstriata Clarke, Mem. N. Y. State Mus., vol. 3, No. 3, p. 43, pl. 6, figs. 1-4. 1913. Trematospira multistriata Schuchert, Geol. Surv., Md. Low. Dev., p. 428, pl. 73, figs. 3, 4. Description—Shell of medium size, transversely oval in outline, cardinal extremities rounded. The dimensions of two separate valves are: Pedicle, length 19 mm., width 25 mm.; brachial, length 18 mm., width approximately 22 mm., the greatest width a little in front of the hinge line. Pedicle valve moderately convex, with an ill-defined mesial sinus, which is broad and shallow at the anterior margin, but towards the beak becomes narrow and almost obsolete. Beak small, blunt, incurved over that of the opposite valve; apex pierced by a round foramen. Brachial valve slightly more convex than the pedicle, the middle portion elevated into a scarcely perceptible fold which broadens anteriorly. Beak small, closely incurved below the other. Surface of both valves marked by numerous prominent, angular, radiating plica- tions; these bifurcate at regular intervals, each one usually twice in passing from the beak.to the anterior margin, hence giving the surface a fasciculate appearance. Con- centric lines of growth across the shell. Remarks—This characteristic Helderbergian form is represented in the Little Saline fauna by a few separate valves but among the specimens studied none attain the large size of the full-grown New York examples as figured by Hall. In size, and in the number and coarseness of the plications, they seem to be more eee. allied with the southern examples figured in the Maryland reports. Horizon—Upper beds. Figured specimens No. 27496, Walker Museum. ro. =. a i ool _ wee oh eT hye pee? ‘. he BRACHIOPODA. 249 Family Meristellidae Genus Nucleospira Hall Nucleospira cf. ventricosa (Hall) Plate 66, figures 1-3 1857. Spirifer ventricosa Hall, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist., p. 57. 1859. Nucleospira ventricosa Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 220, pl. 14, fig. 1; pl. 28b, figs. 2-9, 14, 1861. 1913. Nucleospira ventricosa Schuchert, Geol. Surv., Md. Low. Dev., p. 430, pl. 73, figs. 10-12. Description—Shell small, transversely oval in outline. The dimensions of an im- perfect brachial valve are: Length approximately 9 mm., width 11 mm. A smaller brachial valve measures 6 mm. in length and 8 mm. in width. The cardinal margins slope abruptly from the beaks, and terminate in well rounded extremities. Brachial valve convex, median portion most elevated, and marked with a shallow sinus extending from the beak to the anterior margin. Beak pointed, moderately ele- vated. Surface marked by indistinct concentric growth lines. Concerning the pedicle valved#lall says: ‘Ventral valve having a narrow sinus extending down the centre from beak to base; beak projecting above the other, strongly incurved and pointed (in many specimens the beaks are nearly equal)’’—Hall, 1859. Remarks—Three or four fragmentary brachial valves have been observed in the collection, which resemble Nucleospira ventricosa Hall, from the New Scotland beds of New York, and they are undoubtedly a later expression of that species. Except that the specimens observed possess more steeply sloping cardinal margins there seems to be no important variation from this New Scotland species. Horizon—Lower beds. Figured specimens No. 27494, Walker Museum. Genus Meristella Hall Meristella ampla sp. nov. Plate 66, figures 9-11 Description—Shell from medium size to large, sub-quadrate in outline, relative length and width variable, but generally the width slightly greater than the length. The dimensions of the holotype, which is an average sized brachial valve are: length 36mm., width 37 mm. Cardinal margins slope steeply to the beaks, extremities rounded. Pedicle valve moderately convex, the greatest convexity in the umbonal region, apparently flattened anteriorly. Beak broad and flat, incurved slightly. A cast of the interior shows a large, strongly defined muscular area which is longitudinally striate. A long narrow process projects from the muscular platform to the beak. The region surrounding the muscular area is rugose. Brachial valve more convex than the opposite, maximum convexity in the umbonal region, and a flattening occurs anteriorly similar to that of the opposite valve. Beak incurved slightly. Surface of both valves essentially smooth with faint lines of growth. Remarks—This form is represented by the separate valves only. It resembles Meristella sub-quadrata Hall, but has a less distinctly quadrate outline, the pedicle valve is less convex, and the anterior margin more broadly rounded. It differs from associated species in the larger size of the full-grown examples, and in the greater tendency to quadrate outline. Horizon—Lower beds. Holotype and Paratypes No. 27487, Walker Museum. 250 THE DEVONIAN OF MISSOURI. Meristella carinata sp. nov. Plate 66, figures 12-21 Description—Shell of medium size, sub-quadrate in outline, relative length and width variable, sometimes equal. The dimensions of a perfect individual, the holotype, are: Length 23 mm., width 24 mm. Hinge line less than the greatest width of the shell. Cardinal margins gently concave, forming depressed oval areas on both sides of the beak; extremities rounded. he Pedicle valve sub-quadrate in outline, arched from beak to base, depressed convex to about the middle, and then becoming somewhat concave to form a broad, shallow sinus, which at the anterior margin is projected into an acute linguiform extension. Beak elevated, rounded, and closely incurved over the brachial beak. An impression of the interior shows the large and strongly defined, fan-shaped muscular impressions. Brachial valve strongly convex to gibbous, the median portion elevated into a sharply sub-carinated or rounded fold, which in some specimens is especially well defined at the anterior margin. From the fold the sides slope steeply to the lateral margins. Beak incurved below that of the opposite valve. The interior shows the im- pression of a narrow median septum extending over half way to the base. Surface of both valves marked by concentric‘lines of growth, which are paralleled by numerous finer striations. Remarks—This is a common species in the collection, and is represented by entire specimens and by individual valves. It approaches Meristella lata Hall, of the New York Oriskany, but differs in its smaller size, in the more sharply defined median portion of the brachial valve, in the more depressed pedicle valve, and in the projection of the sinus into linguiform extension. This form is especially characterized by the carinated brachial valve, and this feature distinguishes it from associated species. Horizon—Lower beds. Holotype and Paratypes No. 27492, Walker Museum. Meristella elliptica sp. nov. Plate 66, figures 4, 5 Description—Shell of medium size, elongate elliptical in outline, length considerably greater than the width. The dimensions of two perfect pedicle valves are: Length 28 mm., width 22 mm., and length 23 mm., width 19 mm., the maximum width midway beracen the beak and anterior margin. Pedicle valve moderately convex, no “indication of sinus, but a slight flattening of the shell is visible toward the rounded anterior margin. Beak prominent, incurved, apparently acute. Surface marked by fine concentric growth lines which are especially prominent near the base. Brachial valve unknown. Remarks—The species approaches Meristella laevis Hall, but differs in its more- elongate form, and in the absence of a sinus. Horizon—Lower beds. Holotype and Paratypes No. 27490, Walker Museum. Meristella ovalis sp. nov. Plate 66, figures 6-8 Description—Shell of medium size, transversely oval in outline, usually broader than long. The dimensions of two separate valves are: Length 21 mm., width 25 mm., and length 14 mm., width 16 mm., the maximum width midway betwen the beak aie anterior margin, ae slightly anterior to the middle. BRACHIOPODA. 251 Brachial valve moderately convex, the greatest convexity in the umbonal region. Surface of the shell sloping uniformly to the lateral and broadly rounded anterior margins. Beak broad and incurved a little. Surface smooth except for the fine lines of growth which become-more prominent near the base of the shell. Pedicle valve unknown. Remarks—The species of Meristella present a somewhat perplexing problem be- cause the variation within each species is so great, and the gradation from one to another is so complete that a separation of the forms is difficult. The difficulty of separating the species is increased because so few entire specimens occur, the separate valves being most common, and no pedicle valve can at present be linked with the brachial valve here described with any degree of certainty. These brachial valves bear a marked resemblance to those of Meristella bella Hall, but differ in being less gibbous, and in the absence of a mesial sinus which is a feature of that species, and which causes an emarginate outline of the front, not noticeable here. Horizon—Lower beds. Holotype and Paratypes No. 27489, Walker Museum. Family Coelospiridae Genus Anoplotheca Sandb. Anoplotheca dichotoma (Hall) ‘Plate 66, figures 22-25 1859. Leptocoelia dichotoma Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 452, pl. 103, b, figs. 3a-3c. : 1913. Anoplotheca dichotoma Schuchert, Geol. Surv., Md. Low. Dev., p. 435, pl. 73, figs. 24-26. Description—Shell small, concavo-convex, generally ovate. The dimensions of a somewhat imperfect pedicle valve are: Length 8 mm., width approximately 9mm. The brachial valve of a different individual measures 7 mm. in length and 8 mm. in width. Pedicle valve strongly convex, the middle elevated into a fold, from which the surface slopes abruptly to the lateral margins, and less steeply to the anterior margin. Greatest elevation in the umbonal region. Beak elevated above the hinge line, and notably incurved. Brachial valve flattened at the postero-lateral margins, and near the beak depressed into a narrow sinus which becomes broad and shallow near the base of the shell. Surface of both shells marked by radiating plications, which are imperfectly pre- served. According to Hall ‘‘The surface is marked by dichotomizing plications, the central one of the dorsal valve becoming tripartite, and the three lateral, which are simple to their original, bifurcating and making 6 at the margin of the shell. On the central valve there are two smaller plications in the centre, and a dichotomizing one on each side; concentrically marked by a few imbricating lines of growth.’’—Hall, 1859. Remarks—About half a dozen separate valves have been observed. They are smaller than the New York forms, and show the surface characters only indistinctly. The ovate outline, the highly convex to sub-carinate pedicle valve, and the plano-convex brachial valve with broad shallow sinus, are distinct features of the species which the specimens exhibit. Horizon—Lower beds. Figured specimens No. 27484, Walker Museum. Anoplotheca flabellites (Conrad) Plate 66, figures 26, 27 1841. Atrypa flabellites Conrad, Fifth Ann. Rept. N. Y. Geol. Surv., p. 55. 1859. Leptocoelia flabellites Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 449, pl. 106, figs. la-1f; pl. 103b, figs. 1a-1f, 1861. 252 THE DEVONIAN OF MISSOURI. 1913. Anoflotheca (Leptocoelia) flabellites Schuchert, Geol. Surv., Md. Low. Dev., p. bea 438, pl. 73, figs. 29-33. < Tiasivep hing =Shiall of medium size, usually broader than long, from sub-oval to semi-circular in outline. The pedicle valve of an-average sized individual measures 11 mm. from beak to anterior margin, and 13 mm. along the hinge line which is equal to the greatest width. Pedicle valve convex, the maximum convexity along the middle. Beak slightly incurved above the hinge line, perforation in apex not observed. Cardinal extremities rounded. Surface marked with ten coarse, angular plications, the middle plication somewhat smaller than the two adjacent ones. ‘Dorsal valve flat; beak straight; hinge line sloping from the beak at an angle of 110 to 160 degrees, rounded at the extremities............On the dorsal valve the two middle plications are a little closer together, and slightly more ‘prominent near the front than the others; while the depressions separating them from these, each side, are a little wider and deeper than those between the other plications.’’—Hall, 1859. Remarks—This characteristic lower Devonian species is represented in the Little Saline limestone by very few examples. There is a slight individual variation in the shape, the degree of slope of the cardinal margins, and the amount of rounding of the cardinal extremities, but on the whole the characters seem to be fairly constant. The specimens observed are smaller than those of this species figured from the Grand Greve limestone, and compare more closely in size with those from the Moose River sand- stone, New Brunswick. Horizon—Lower beds. Figured specimens No. 27486, Walker Museum. ; MOLLUSCA Class PELECYPODA Order Prionodesmacea Superfamily Pteriacea Family Pteriidae Genus Actinopteria Hall Actinopteria insignis Clarke Plate 67, figures 1, 2 1900. Actinopteria insignis Clarke, Mem. N. Y. State. Mus., vol. 3, No. 3, pl. 35, pl. 4, figs. 10-13. Description—Clarke discusses this species as follows: ‘‘In form and proportions this shell resembles a young Actinopteria communis, but its habit is always small, and _ its exterior profoundly cancellated. It is oblique, with large and much depressed posterior wing, and small but nasute anterior wing, separated from the body of the shell by a broad sulcus distinctly extending to the umbo. The principal radial striae are strong and rounded, each interspace bearing from one to three very much smaller ones, making a more marked contrast in the size of the radii than is exhibited by the species Actinop- teria communis. These lines are crossed by close concentric lamellae cancellating the entire surface, though both series of lines are quite obscure on the posterior wing. To a certain degree this shell presents in miniature the characters of the species Actinopteria — textilis, which is mainly distinguished from its associate, Actinopteria communis, in the stronger cancellation and interruption of the radii.’’—Clarke, 1900. : Remarks—A single well-preserved small specimen referable to this species has been observed and a larger one is doubtfully referred to the same species. Horizon—Lower beds. Figured specimens No. 27555, Walker Museum. eS —— or —=):- sas es + és OE ee re Pee Pry ow ~ GASTROPODA. 253 Actinopteria ? Plate 67, figures 3, 4 The Little Saline limestone affords a few fragmentary examples which are tenta- tively referred to this genus. The pelecypods in general are represented by mere frag- ments, and constitute a subordinate part of the fauna. Horizon—Lower beds. Figured specimens Nos. 27556, 27557, Walker Museum. Family Pectinidae Genus Aviculopecten M’Coy Aviculopecten sp. undet. Plate 67, figure 5 A fragment of an Aviculopecten has been observed which is unsuitable for certain determination. The surface is characterized by the presence of coarse distinct ribs, with each intervening space divided by a lower less prominent rib, and the interspaces — marked by fine, indistinct striae. Concentric, undulating markings cancellate the ribs; these are uniformly spaced at a distance of from 1.5 to 2 mm. apart. Horizon—Lower beds. _ Figured specimen No. 27558, Walker Museum. Class GASTROPODA Subclass Streptoneura Order Aspidobranchia Suborder Rhipidoglossa Family Trochonematidae Genus Strophostylus Hall Strophostylus allant sp. nov. Plate 70, figures 9-15 Description—Shell of medium size to large. The dimensions of the holotype which isa large specimen are: Height 50 mm., width 40 mm. Shell consisting of three rapidly expanding whorls, the inner one rising considerably above the outer; spire of medium height; suture distinct; upper surface of volutions convex, sides obliquely rounded. Aperture entirely sub-circular to broadly oval, and slanting obliquely backward below. Character of inner lip cannot be determined from specimens observed. Surface marked by coarse, irregular lines of growth, and on the outer volution these are crossed at right angles by faintly defined striations. Remarks—The species resembles Strophostylus transversus Hall, from the New York and Maryland Oriskany, but is distinguished by the higher spire, and the more distinctly irregular and imbricating lines of growth. Horizon—Lower beds. Holotype and Paratypes No. 27509, Walker Museum. 1This species has been named after Professor J. A. Allen, head of the Department of Geology, University of Alberta, Edmonton, Alberta, Canada. 254 THE DEVONIAN OF MISSOURI. Order Ctenobranchiata Suborder Platypoda Superfamily Ptenoglossa Family Capulidae Genus Orthonychia Hall Orthonychia belli Clarke — Plate 67, figure 6 1908. Platyceras (Orthonychia) belli Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, ps» 147, pl. 14, figs. 20, 21. ' Description—Shell erect, of medium size. The dimensions are: Length about 45 mm., width of aperture 30 mm. Outline of shell conical, expanding very gradually but uniformly for about half its length. The expansion becoming more abrupt for the remainder of the distance. Apex missing. Aperture essentially circular, peristome undu- lating. Surface features obscure. 2 Remarks—An incomplete specimen only has come under observation. The apex of the shell is lacking, and its character unknown, but the remainder of the specimen seems to conform in all details with the form occurring in the Grand Gréve beds at Gaspé. Horizon—Upper beds. Figured specimen No. 27512, Walker Museum. Orthonychia praeconicum sp. nov. Plate 68, figures 1, 2 Description—Shell of medium size, erect, conical to pyramidal, apex missing; height approximately 35 mm., maximum width of aperture 26 mm. Body volution entirely straight, expanding rapidly and becoming extremely ventricose, marked with four or five well-defined longitudinal ridges and depressions, which become obsolete about one-third of the distance from the apex. The depressions are broad and shallow _in the middle of the shell, and become still broader and more conspicuous near the aperture; ridges round.and prominent. Aperture having a sub-triangular outline; peristome apparently deeply sinuous. Remarks—This species approaches: Platyceras (Orthonychia) conicum Hall, but has a more pronounced pyramidal outline, and the aperture is more distinctly quadrangular. On the small patch of shell which remains attached to the casts, no trace of nodose striae such as characterize the above-mentioned species has been observed. It is of interest to note that the Little Saline specimens show a closer resemblance to the Hamil- ton examples that have been figured than to those from th'e Onondagan. Horizon—Upper beds. Holotype No. 27528, Walker Museum. Orthonychia jarfuose (Hall) Plate 67, figures 7-10 1859, Platyceras tortuosum Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 472, pl. 113, figs. 1-5 TObn. oo 1908. Platyceras tortuosum Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, p. 146, pl. 14, figs. 22-25. ne eC e e e ae tp ete Ai fal i ee, Cee GASTROPODA. 255 1913. Orthonychia tortuosa Ohern, Geol. Surv., Md. Low. Dev., p. 469, pl. 79, figs. 10-12. Description—Shell erect, elongate, conical, ascending spirally and forming slightly more than one volution; whorls widely separated and expanding regularly to the aper- ture. Inner side of spire distinctly corrugated spirally. Aperture sub-circular, peristome undulated. Surface marked with fine concentric striae, which are closely crowded, wavy and parallel the undulations of the peristome. Remarks—This species presents considerable variety in shape, rapidity of expansion of volutions, and in the distinctness of the corrugations. An average individual meas- _ures from 45 to 50 mm. from apex to peristome, while larger forms measure as much as 65 mm. in height, hence displaying a closer relationship in size to the Gaspe forms than _ tothose of New York. Internal casts only occur, in a few cases with portions of the shell attached. The corrugations apparently are not a persistent feature, in some examples they are strongly marked, in others practically absent. Horizon—Lower beds. Figured specimen No. 27513, Walker Museum. Genus Platyceras Conrad Platyceras angulare Rowe Plate 68, figures 3, 4 1913. Platyceras angulare Rowe, Geol. Surv., Md. Low. Dev., p. 476, pl. 85, fig. 3. Description—Shell moderately elevated, sub-conical, sides sloping regularly from aperture to apex, one whorl. Apex incurved but free; aperture elongate oval in outline. The shell substance is missing, but the cast shows from 4 to 6 angular, longitudinal ridges occurring at irregular distances from each other, and separated by broad, shallow depressions, and extending from the aperture to very near the apex where they become obsolete. Indistinct elongate nodes mark the ridges. The dimensions are: Length from beak to outer edge of aperture 37 mm., length of aperture 27 mm., width of aper- ture 25 mm. Remarks—One specimen, a cast of the interior has been observed. The general depressed appearance, and the sharp angular ridges separated by broad shallow grooves, suggest its affinity with the species described by Rowe. The specimen reveals in addi- tion the character of the-apex, and the ei outline of the aperture. Horizon—Lower beds. Figured specimen No. 27514, Walker Museum. Platyceras depressum sp. nov. Plate 69, figures 15, 16 Descri¢tton—Shell of medium size, depressed ovoid, consisting of three closely contiguous whorls; spire depressed below plane of body volution whose upper side is inclined toward the depressed spire. Lateral surface sloping obliquely downward, slightly concave, giving rise to a ridge-like lateral border. Whorls gradually expanding from apex to aperture, the aperture not well shown, but apparently vertical, and from triangular to sub-quadrilateral in outline. Suture lines deeply impressed. Basal view showing a wide, deep umbilicus. Surface characters obscure; a small portion of shell adhering near the umbilicus exhibits indistinct transverse striae which have a tendency to sinuosity: Exterior surface rough, but not nodose as in Platyceras nodosum Conrad. Surface of the cast generally rough, possibly indicating a rough or somewhat nodose shell surface. Remarks—There are present in the collection two entire casts and a fragmentary portion of a third. This species is distinguished from all the other Platycerids present 256 THE DEVONIAN OF MISSOURI. in the fauna by the depressed spire, the inclination of the upper side of the body whorl - toward the spire, and the obliquely sloping lateral sides which make, with the upper side, a moderately sharp angle. Horizon—Lower beds. Holotype and Paratypes No. 27518, Walker Museum. Platyceras dumosum Conrad Plate 68, figure 5 1840. Platyceras dumosum Conrad, Third Ann. Rept. Pal. Dept. N. Y. Surv., p. 205. 1879. Platyceras dumosum Hall, Nat. Hist. N. Y. Pal., vol. 5, pt. 2, pl. 14, pl. 5, figs. ~ 11-16 and pl. 6, fig. 1. : Description—Shell small, subevoid, consisting of about three ‘whorls, the first two contiguous, and the third or body whorl becoming free and expanding rapidly; spire depressed below the plane of the body volution. Character of aperture obscure. Sur- face marked by closely spaced, concentric, sinuous striae. At irregular intervals on the longitudinal ridges there are projecting nodes which are extended into spines of uncer- tain length. : Remarks—One imperfect specimen may be referred to this Onondagan species. The form is smaller than those figured in the New York reports and may possibly be an immature individual. The spinose character of the surface is very distinctive of the species. Horizon—Upper beds. Figured specimen No. 27527, Walker Museum. Platyceras elongatum var. parvum n. var. Plate 68, figure 6 Description—Shell erect, elongate conical, slightly curved, curvature near the apex most pronounced. One or two curving undulations are present near the aperture; aperture not fully preserved, but presumably sub-circular to circular in outline. Sur- face essentially smooth. Remarks—One specimen only has come under observation. It resembles the young specimen of Platyceras elongatum Hall, with the exception’ that the longitudinal and transverse striations are absent. The curving undulations give the shell a twisted appearance not noticeable in Platyceras elongatum, but such irregularities might be considered as an accidental feature in growth, rather than a diagnostic specific char- acter, and it seems best to consider this form as a variety of the above species. Horizon—Lower beds. Holotype No. 27525, Walker Museum. » . Platyceras gebhardt Conrad Plate 68, figures 7-10 1859. Platyceras gebhardi Conrad, Nat. Hist. N. Y~ Pal., vol. 3, p. 312, pl. 56, figs. 5a, 5b, 6, 7, 9; pl. 55, figs. 6a-b. ; Description—Shell small, volutions expanding obliquely and rather rapidly. Spire composed of three or four contiguous volutions, apex in general plane of body whorl or slightly below. Suture line deeply marked; aperture rounded or subovate, in some specimens expanded. Surface finely striate transversely. The dimensions of an average sized individual are: Height 13 mm., height of aperture approximately 11 mm., width 10 mm. GASTROPODA. 257 Remarks—This form is represented chiefly by casts; and only fragments of the shell substance are preserved. The specimens are smaller than ie from the Oriskany - of New York, but in other respects agree with them. Horizon—Lower beds. Figured specimens No. 27522, Walker Museum. Platyceras cf. gracile Ohern Plate 68, figures 11-13 1913. Platyceras gracile Ohern, Geol. Surv., Md. Low. Dev., p. 478, pl. 85, figs. 10-13. Description—Shell small, sub-conical, ascending spirally, whorls a little more than one, free; shell expanding regularly from apex to aperture; aperture circular to sub- circular in outline; peristome not observed. The dimensions of a large specimen are: Height 30 mm., greatest diameter of aperture 16 mm. The proportionate height and breadth in individuals varies to a marked degree. A fragment of shell substance ad- hering to the cast shows the surface marked by irregular, transverse striations. Most of the specimens have distinct spiral corrugations extending from the aperture up to or almost to the apex. Apex missing in all specimens examined. Remarks—This shell bears.a close resemblance to Platyceras gracile Ohern, from the Maryland Oriskany, but it is considerably smaller, and does not have the apex so nearly in the plane of the right side of the aperture. Also some of the Little Saline forms are more nearly eréct than those from Maryland. Horizon—Lower beds. Figured specimens No. 27523, Walker Museum. Platyceras magnificum Hall Plate 68, figures 14-17 1859. Platyceras magnificum Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 476, pl. 119, figs. 1-6, 1861. 1913. Platyceras magnificum Ohern, Geol. Surv., Md. Low. Dev., p. 472, pl. 82, figs. 1-6. Description—‘‘Shell obliquely subovate. Spire depressed below the plane of the outer volution; volutions two or three, very rapidly expanding and becoming extremely ventricose below, usually free or with the first one contiguous, aperture expanded sub- circular, campanulate, and often with the margin reflexed, particularly on the left side. Surface marked by distinct, transverse, lamellose, undulating striae.’’—Hall, 1859. Remarks—The specimens in the collection‘are all casts of the interior, but patches of shell are attached and display sinuous lines of growth. The species differs from Diaphorostoma ventricosum Hall, in the more rapid expansion of the whorls, in the free- dom of the volutions, and in the wider and more expanded aperture. Character of : peristome obscure in all specimens observed. Horizon—Lower beds. Figured specimens No. 27529, Walker Museum. Platyceras cf. multisinuatum Hall Plate 69, figure 1 1859. Platyceras multisinuatum Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 319, pl. 58, figs. 8a, b, c and 9a, b, 1861. 1913. Platyceras multisinuatum Ohern, Geol. Surv., Md. Low. Dev., p. 477, pl. 85. figs. 4-6, Descriptuon—‘‘Shell subdiscoid in the young state; apex nearly on a plane with the ica volution; volutions about three, the first one minute; outer one becoming ; F 3 { j E 4 258 . THE DEVONIAN OF MISSOURI. free, ventricose, rounded or scarcely angular below, somewhat flattened on the upper side, marked by several ridges and shallow depressions on the upper and dorsal sides; aperture somewhat longitudinally oval; peristome sinuate, with a deeper sinuosity on the anterior margin. Surface marked by fine, transverse striae, which are strongly undulated on the inequalities of the shell, and crossed by fine longitudinal or revolving striae.’’—Hall, 1859. Remarks—Only a single fragmentary cast has come under hesecaiun The general shape of the specimen corresponds closely to the above species, and the dorsal side exhibits the characteristic longitudinal ridges. Apex, surface striae, and character of peristome not observed. Aperture probably longitudinally oval or subcircular. Horizon—Lower beds. Figured spectmen N 6. 27515, Walker Museum. Platyéeras cf. newberryi Hall Plate 69, figure 2 1859. Biaiscokes newberryi Hall, Nat. Hist, N. Y. Pal., vol. 3, p. 333, pl. 63, figs. 14a-c, 1861. 1913. Platyceras newberryi Ohern, Geol. Surv., Md. Low. Dev., p. 479, pl. 86, fig. 4. Description—Shell small, subdiscoidal, with about three volutions, the last one expanding rapidly and becoming almost ventricose, the first two small and closely coiled; aperture not well preserved, probably circular or transversely oval. Surface marked by widely and irregularly spaced, transverse, sinuous plications. These are crossed by closely packed, and regular longitudinal striations. Remarks—The one specimen present in the collection is fragmentary, but near the apex a portion of the shell substance is preserved, which shows the surface markings in fine detail. In shape there is a close resemblance between this specimen and P. newberryi, but the surface ornamentation differs; the transverse plications being more widely spaced, more distinct, and more sinuous than in the specimens figured by Hall. The transverse ridges are lacking, although there is a suggestion of them in the plica- tions, which on thé lower part of the portion of shell adhering, become distinctly coarse and lamellose. There is no suggestion of flattening in the preserved part of the shell. This specimen is evidently not identical with P. newberryi, although the general shape and strong development of the longitudinal striae suggest a close relationship. Horizon—Lower beds. Figured specimen No. 27519, Walker Museum. Platyceras nedosum Conrad Plate 69, figures 3-6 1841. Platyceras nodosum Conrad, Ann. Rept. Pal. N. Y., p. 56. 1859. Platyceras nodosum Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 473, pl. 115, figs. 1-6; pl. 116, figs. 1-4, 1861. 1913. Platyceras nodosum Ohern, Geol. Surv., Md. Low. Dev., p. 469, pl. 79, figs. 13, 14. Description—Shell of medium size. The dimensions of an average individual are: Height 45 mm., diameter 25 mm. Spire depressed, consisting of three or four rapidly expanding volutions. In cross-section the whorls present an oval outline, the upper side convex, the lateral side also convex and obliquely inclined to the upper. Surface marked with spinose nodes, having no definite arrangement. Original shell present in one small patch shows transverse, strongly marked, sinuous lamellae. Character of aperture and peristome obscure. Remarks—This species is represented sparsely in the lower beds, but somewhat more abundant in the upper. In general the specimens are smaller than those from the GASTROPODA. 259 ~ New York Oriskany, but very similar in size to the ones occurring at Cumberland, Maryland. Horizon—Lower and upper beds. Figured specimens No. 27521, Walker Museum. Platyceras peregrinus sp. nov. Plate 69, figures 13, 14 Descraption—Only a fragmentary portion of one shell has been observed. Shell depressed, discoidal, whorls probably not more than one; apex of spire incomplete, but apparently obtuse; younger portion of the shell less compressed than later stages, the more pronounced compression beginning rather suddenly about one-third the dis- tance from the apex. Suggestions of parallel transverse undulations are present in the older part of the shell. Character of aperture not observed. Remarks—This form may be distinguished from all the other Platycerids present in the fauna because of the strong lateral compression. In general shape the specimen - agrees best with Platyceras ccmpressum Clarke and Swartz, from the Chemung of Maryland, but expansion of the whorl is more rapid in that form, and compression begins closer to the apex. Some resemblance to Platyceras whitit Clarke, from the Devonian of Para, is also suggested, but the dorsal ridge of that form is absent here. Horizon—Lower beds. Holotype No. 27517, Walker Museum. _ Platyceras planovolvis sp. nov. Plate 70, figures 1-5 Description—Shell medium to large, discoidal, consisting of 3 or 4 gradually but rapidly expanding whorls, which in the majority of the specimens are closely coiled in one plane; whorls contiguous with the exception of one or two specimens and in these the outer volution is free; spire in same plane or very slightly depressed below body volution. In cross section the whorls present a circular to an oval outline. Aperture entire, shape varying from sub-circular or transversely oval to longi- tudinally oval, expanded, almost campanulate; outer lip of peristome extended, inner contiguous with body volution. Upper side of body whorl slightly flattened to gently and evenly convex. Surface marked by transverse striae, closely packed, and undulating. A few of the specimens show traces of transverse ridges. ? Remarks—This is the most abundant species of the genus in the Little Saline limestone and is distinct from all the associated species by reason of the character of coiling in one plane. It is represented by the internal casts only; rarely these have por- tions of the shell attached which reveal the surface features. The specimens present a distinct variation in size, in outline of aperture, in rapidity of expansion of whorls, and in amount of depression of spire, but all exhibit the same even manner of coiling in one plane, and the expanded aperture. Horizon—Lower and upper beds. Holotype and Paratype No. 27526, Walker Museum. Platyceras reflexum Hall Plate 69, figures 7-9 1859. Platyceras reflecum Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 477, pl. 120, figs. 1-7, ' 1861. 1913. Platyceras reflexum Ohern, Geol. Surv., Md. Low. Dev., p. 473, pl. 83, figs. 5, 6; pl. 84, figs. 1, 2. 260 THE DEVONIAN OF MISSOURI. Description—Shell of medium size, spirally ascending, sub-conical in outline; apex - consisting of two or three closely coiled but free volutions. Body whorl expanding regularly, and towards the aperture somewhat rapidly; aperture almost circular and rather broadly expanded; character of peristome obscure. Fine, undulating, and closely crowded transverse striae mark the surface. Remarks—This species is represented by some small specimens which are ap parently young individuals, and by several incomplete large forms which are doubt- fully referred to the same species. They display a considerable variation in the rapidity of expansion of the body whorl, and in the amount of expansion of the aperture, but in general they closely approximate the above species. ; : Horizon—Lower beds. Figured specimens No. 27530, Walker Museum. Platyceras retrorsum Hall Plate 69, figure 10 1859. Platyceras retrorsum Hall, Nat. Hist. N. Y. Pal., p. 320, pl. 58, figs. 10a, b, 6c; pl. 59, figs. 9a, b. ~ Description—Shell of medium size, depressed, ascending spirally, whorls about me free; the first whorl nearly smooth, while the second or body whorl is marked with widely spaced, spiral ridges or corrugations, which are absent on the ventral side of the shell. Dorsal side flattened, the apex a little elevated above the outer volution of the shell. Surface marked transversely by fine, closely spaced, sinuous striae. Aperture not definitely “known, probably subcircular with undulating peristome. Remarks—One exfoliated individual occurs which has portions of the shell attached. Apart from its smaller size, there seems to be no essential difference from the specimens in the Lower Helderberg of New York. Horizon—Lower beds. Figured specimens No. 27524, Walker Museum. Platyceras cf. subconicum Ohern Plate 69, figure 11 1913. Platyceras subconicum Ohern, Geol. Surv., Low. Dev., p. 479, pl. 86, figs. 1-3. Description—Shell small, obliquely conical, whorls probably one; shell expanding fairly rapidly from apex to aperture; apex broken but it appears to have been blunt and twisted slightly to the right. Aperture and peristome obscure; surface features not preserved. ' Remarks—The specimens are entirely too fragmentary for certain determination, and the reason for referring the specimen to this species is because of the evident cor- respondence in shape with authentic specimens in the collection of Walker Museum. Horizon—Lower beds. Figured specimen No. 27520, Walker Museum. Platyceras trilobatum Hall Plate 69, figure 12 1859. Platyceras trilobatum Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 316, pl. 57, ceo 3a; b, c, 1861. 1913. Platyceras trilobatum Ohern, Geol. Surv., Md. Low. Dev., p. 475, pl. 84, ie he ids Description—‘‘Body of shell obliquely or arcuately ovoid, trilobate; volutions three or four, the last one (or more) becoming free, gradually expanding to the aperture; the apex closely involved and rising above the plane of the outer volution, or sometimes See CTCTCLCUC Siena ONO t me GASTROPODA. 261 on the same plane, concave toward the suture; aperture subangularly ovate, sinuate on the right and left sides, and the shell extended in front. Surface marked by two strong, spiral depressions corresponding to the sinuosities of the aperture, and crossed by lamellose striae which are strongly undulated on the sinuosities of the last volution, and are marked by other undulations on the earlier volutions, indicating former sinuosities in the margin of the aperture.’’—Hall, 1859. Remarks—An incomplete and exfoliated specimen is the only example representing this species. The apex is missing, hence the character of the complete specimen cannot be definitely determined. The distinctly trilobate form, and the clearly defined: spiral depressions are the characters used to identify the species. Surface is irregular, lumpy, or nodose in character. Shell surface unknown. Horizon—Lower beds. Figured specimen No. 27516, Walker Museum. Genus Diaphorostoma Fisher Diaphorostoma ventricosum (Conrad) Plate 70, figures 6-8 1859. Platyostoma ventricosa Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 300, pl. 55, fig. 9a, b, c; p. 469, pl. 112, figs. 1-10; pl. 113, figs. 7, 8; pl. 115, fig. 8, 1861. 1892. Platyostoma ventricosa Conrad, Jour. Acad. Nat. Sci., Phila., vol. 8, p. 275, pl. tee fie. 5. 1900. Diaphorostoma ventricosum Clarke, Mem. N. Y. State Mus., vol. 3, No. 3, p. 30, pl. 3, figs. 25-28. 1913. Diaphorostoma ventricosum Ohern, Geol. Surv., Md. Low. Dev., p. 482, pl. 87, figs. 1, 2. ‘ Description—Shell globose, spire slightly elevated, in a few cases depressed; whorls three, closely coiled, expanding rapidly until the last one or body whorl becomes hishly ventricose; volutions flattened on upper side, curving obliquely on the lower, giving the shell a twisted appearance. Aperture subcircular, greatest diameter 40 mm., inner. lip of peristome reflexed. - Surface of shell marked by indistinct transverse striae, which parallel the lines of growth. je Remarks—This species is fairly abundant in the collection, both mature and im- mature individuals being present. The flattened upper surface, and the pronounced ventricosity of the body volution characterize all the specimens, Some of the smaller ones may be readily confused with Diaphorostoma depressum Conrad, and the only apparent distinction is the greater tendency to ventricosity in the outer volution. ' Horizon—Lower and upper beds. Figured specimens No. 27508, Walker Museum. Order Opisthobranchia Suborder Pteropoda Family Hyolithidae Genus Hyolithes Eichwald Hyolithes cf. oxys Clarke Plate 69, figure 17 1908. Hyolithes oxys-Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, p. 143, pl. 12, figs. 10-13. Description—Shell large, conical, sides tapering gradually, length approximately 42 mm., diameter of aperture 16 mm. Dorsal face strongly convex; ventral face not 262 -THE DEVONIAN OF MISSOURI. obseived. Surface marked by concentric striae which bend slightly upwards towards the aperture. At irregular, but wide intervals there are shallow depressions paralleling the striae; these are especially noticeable near the aperture. Remarks—The interior of the dorsal side has been observed. The form bears a close resemblance to the large specimen of Hyolithes oxys Clarke, with this difference, that the longitudinal grooves present in that form are lacking here, and the concentric striae bend towards the aperture instead of towards the apex. Horizon—Lower beds. Figured specimen No. 27510, Walker Museum. Suborder Conulariida- Family Tentaculitidae Genus Tentaculites Schloth Tentaculites elongatus Hall Plate 69, figure 18 1859. Tentaculites elongatus Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 136, pl. 6, figs. 16-21, 1861. 1908. Tentaculrtes elongatus Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, p. 118, pl. 12, figs. 8, 9. 1913. Tentaculites elongatus Ohern, Geol. Surv. Low. Dev., p. 485, pl. 87, figs. 8-10. Description—A few fragmentary specimens belonging to this:species occur. The elongate and tapering form, and the strongly marked annulations are unmistakable evidence of their identity with this common Oriskany species. The absence of the - fine, closely arranged annular striae which are characteristic of this species, is doubtless due to the condition of preservation. Horizon—Lower beds. Figured specimen No. 27511, Walker Museum. ARTHROPODA Class CRUSTACEA Subclass Trilobita Order Opisthoparia Family Odontopleuridae Genus Acidaspis Murchison Acidaspis sp. undet. Plate 71, fig. 1. Description—This species is represented by a single fragmentary cranidium, ap- parently semi-circular in outline, glabella convex, elongate and narrow, sides straight, separated from lateral lobes by distinct longitudinal furrows. Posterior lateral lobes well defined, small, suboval, anterior pair obsolete or missing entirely. Occipital furrow broad and shallow, but behind the posterior lateral lobes depressed into deep, circular pits. Occipital segment well defined, covered with pustules. Surface of glabella and lateral lobes also marked with pustules which vary considerably in size. Cheeks, thorax and pygidium unknown. CRUSTACEA. 263 Remarks—The material present in the collection is entirely too fragmentary for certain determination, but the form corresponds fairly closely with Acidaspis tubercalatus Hall. It differs in the obsolescence of the anterior lobes, and the better definition of the occipital segment. Horizon—Lower beds. Figured specimen No, 27548, Walker Museum. Family Proetidae Genus Proteus Steininger ‘Proetus conradi Hall Plate 71, figure 2 1900. Proetus conradi Clarke, N. Y. State Mus., Mem. vol. 3, No. 3, p. 25, pl. 2, figs. 11-16. 1908. Proetus phocion Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, p. 135, pl. 9, figs. 14-16. Description—An incomplete cephalon is the only example representing this species. The-specimen possesses a subtriangular, strongly convex glabella with both extremities . well rounded, the anterior portion forming the apex of the triangle. Length slightly greater than the width. The species is characterized by a flat marginal border which is separated from the rest of the cephalon by a shallow groove. Cheeks gently convex, borders flattened. . Remarks—The strongly convex subtriangular glabella, together with the flattened marginal border, are the characters used for the determination of this specimen. Horizon—Lower beds. Figured specimen No. 27550, Walker Museum. Proetus cf. pachydermatus Barrett Plate 71, figure 3 1903. Proetus pachydermatus Weller, Pal. N. J., vol. 3, p. 248, pl. 22, figs. 16-21. 1913. Proetus pachydermatus Maynard, Geol. Surv., Md. Low. Dev., p. 489, pl. 89. fig.*1. Description—This species is represented by several fragmentary, exfoliated cephala. Cephalon small, semi-circular, with a broad, depressed convex, marginal border. Gla- bella elongate oval, or subtriangular, moderately convex, anterior margin rounded, posterior margin straight, the whole set off from the rest of the cephalon by a distinct bordering furrow, or sulcus. The two anterior pairs of glabellar furrows are obsolete, the third pair is pronounced, and curving to connect with the occipital furrow, thus forming two distinct lobes at the base of the glabella. Cheeks poorly preserved, free cheeks entirely lacking. Facial sutures and other characteristics not shown in the incomplete specimens. Remarks—The form resembles Proetus pachydermatus Maynard from the Helder- -berg of Maryland, but lacks the small basal lobes situated posterior to the glabella basal lobes. Horizon—Lower beds, Figured specimen No. 27549, Walker Museum. Proetus protuberans Hall Plate 71, figures 4-7 1859. Proetus BaD Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 351, pl. 73, figs. 5-8, 1861. 264 THE DEVONIAN OF MISSOURI. 1902. Proetus protuberans Weller, Geol. Surv. N. J., vol. 3, p. 296, pl. 32, fig. 2. 1913. Proetus cf. protuberaus Ohern, Geol. Surv., Md. Low. Dev., p. 490, pl. 89, figs. 2-4. Descriptuon—Pygidium small, semi-circular, axis conical, conspicuously, elevated, having 7 or 8 annulations. Lateral lobes with 4 or 5 depressed pleura. Distinct, flat- tened marginal border present. Two glabellae occurring in the upper beds apparently belong to this species. These are prominent, broadly rounded in front, with indistinct lobing, tapering gradually to frontal margin, only a slight portion of which is preserved. Remarks—With the exception of the smaller size, the specimens do not show any essential: differences from those figured from the New York Oriskany. Horizon—Lower and upper beds. Figured specimens No. 27546 Walker Museum. Proetus sp. A number of pygidia of Proetus are present in the upper beds too imperfectly pre- served to be identified. Family Lichadidae Genus Lichas Dalman Lichas sp. Plate 71, figures 8, 9 A few fragments of the cephalon of a large Lichad occur which are not determinable. The surface is covered with prominent pustulae of variable size, and might suggest such a species as Lichas pustulosus Hall. Horizon—Lower beds. Figured specimens No. 27544, Walker Museum. Genus Ceratolichas Hall and Clarke Ceratolichas gryps Hall . Plate 71, figures 13-15 1876. Acidaspis n. sp? Illustrations of Devonian Fossils, pl. 19, fig. 1 (not figs. 2 and 3). : ! 1888. Lichas (Ceratolichas) gryps Hall, Pal. of New York, vol. 7, p. 84, pl. 19b, figs. 7-13. Description—Glabella large, embracing nearly the entire cephalon. Frontal lobe elliptical, convex or tumid, elevated behind, sloping abruptly to the sides and the pos- terior margin, and becoming obsolete at or just behind the centre of the shield. It bears at its summit two strong, diverging, recurved spines, which nearly equal the glabella in length. Longitudinal furrows subparallel, diverging near the frontal margin. Lateral- lobes depressed, becoming obsolete; the members of the first and second pairs have coalesced, and the third pair can be detected only as low, obsolescent nodes bearing a faint tubercle. Near the outer edge of the lateral lobes, and just within the eye lobes, are slender erect pines, usually represented by the broken bases. The anterior slope of the glabella is broad and nearly vertical, the occipital furrow narrow, and the occipital ring broad upon the axis, arched and bearing at its centre two long, divergent spines which are curved downward and slightly inward toward their tips. In the single specimen observed which retains one spine apparently entire, its length is nearly equal to the length of the cephalon. Eye lobes small, inconspicuous. ia _— = ey eae CRUSTACEA. , 265 Surface bearing tubercles which are closely disposed over the frontal lobes, but are scattered or obsolescent.on the lateral lobes. On the posterior slope of the frontal lobe these tubercles appear to be arranged in two longitudinal rows of three or four each. The spines of the head shield are covered with acute pustules and granules..........”’ Hall, 1888. Remarks—A fragmentary glabella corresponds with the descriptions and illustra- tions of this species as shown in the New York Palaeontology. Horizon—Upper beds. Figured specimen No. 27543, Walker Museum. Order Proparia Family Phacopidae Genus Dalmanites Barrande Dalmanites cf. aspinosus Weller Plate 71, figures 10, 11 1908. Dalmanites aspinosus Weller, Pal. N. J., vol. 3, p. 252, pl. 22, fig. 15. 1913. Dalmanites aspinosus Maynard, Geol. Surv., Md. Low. Dev., p. 499, pl. 91, fig. 16. Description—Three incomplete pygidia comprise the only material available for study. The dimensions of the largest specimen are approximately: Length 18 mm., width 26 to 27 mm. Semi-elliptical in outline, posterior pointed. Axis only partly preserved, tapering uniformily, and reaching to within 2 mm. from the posterior margin; the portion preserved divided into 10 annulations which posteriorly become obscure. Lateral lobes with 8 curved pleural, angular and prominent, oblique to the lateral margins; shallow grooves separate the pleura. Remarks—With such inadequate material the identification of these specimens with Dalmanites aspinosus Weller, is uncertain, but the sharp angular pleural ribs extending to the lateral margins of the pygidium, and the absence of any marginal border, strongly suggest this species. From the incomplete pygidia neither the number of pleural ribs, nor the axial annulations can be certainly determined. In size the specimens are com- parable to those from the Maryland Oriskany. Those from New Jersey as figured by Weller are considerably larger. Hortzon—Lower beds. Figured specumens No, 27541, Walker Museum. Dalmanites cf. bisignatus Clarke Plate 71, figure 12 1903. Dalmanites bisignatus Clarke, Mem. N. Y. State Mus., vol. 3, No. 3, p. 19, pl. 2, figs. 6-8. Description—Pygidium distinctly triangular, length greater than width, pleural lobes sloping steeply to the lateral margins; posterior margin apparently extended into a flattened spine. Axis convex, tapering, sides straight or slightly concave; portion preserved divided into 12 segments. Lateral lobes strongly convex, with 14 segments, separated by broad, flat grooves. Ribs flat, well defined to lateral margin and divided longitudinally by fine median depressions. No marginal border present. Surface ornamentation indistinct, consisting of a few, nearly obsolete pustules on the axial portion. Remarks—This form is represented by a single imperfect pygidium which hardly merits specific determination. It resembles Dalmanites bisignatus as figured by Clarke 266 etry THE DEVONIAN OF MISSOURI. from the Becraft Mountain Oriskany, New York, State, and may be compared with that species. Incontrast it hasa greater number of axial annulations, and lacks the character- — istic surface ornamentation of that species. Horizon—Lower beds. Figured specimen No. 27538, Walker Museum. Dalmanites micrurus ? (Green) Plate 71, figure 22 1832. Asaphus micrurus Green, Monograph, Trilobites, N. Amer., p. 56, fig. 3. 1859. Dalmania micrurus Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 359, pl. 74, figs. 13-20. 1908. Dalmaniies micrurus Clarke, Mem. N.Y. State Mus., vol. 9, pt. 1, p. 120, pl. 9, . figs. 1-3. ; : 1913. Dalmanites micrurus Ohern, Geol. Surv., Md. Low. Dev., p. 507, pl. 91, figs. 10-11. Description—A few incomplete cephala exhibit certain definite characters of this species. Frontal lobe large, showing transverse subrhombohedral! outline, three pairs of lateral lobes sharply defined; eyes prominent, large; cheeks separated from glabella by deep, strongly marked dorsal furrows. Entire surface finely pustulose. Because of the absence of the frontal border which is a feature of the species, one cannot be reas- onably sure of the correctness of the identification, but the general shape, and complete separation of the lateral lobes together with the pustulose surface strongly suggest D. micrurus. Hortzon—Upper beds. Figured specimen No. 27542, Walker Museum. Dalmanites cf. pleuroptyx (Green) Plate 71, figure 16 1832. Asaphus pleuroftyx Green, Mon. of Trilobites of North Amer., p. 55. 1888. Dalmanites (Hausmania) pleuroptyx Hall and Clarke, Nat. Hist. N. Y. Pal., vol, 7, p. 28, pl. 11a, figs. 1-3. 1913. Dalmania (Hausmania) pleuroptyx Ohern, Geol. Surv., Md. Low. Dev., p. 510, » pl. 93, figs: 6-10. Descruption—One incomplete pygidium may be compared with this species. It is depressed convex, triangular in outline with the axis depressed-in the posterior region, 8 annulations present in part preserved; the intermediate furrows are deep and narrow, obsolete down the center of the axis. Pleural lobes with broad segments, total number unknown, divided longitudinally by faint median depressions, intermediate furrows narrow and shallow. Ribs strongly oblique posteriorly; lateral margins flattened, indistinct. Remarks—The specimens observed are too fragmentary to permit certain deter- mination, but the characters preserved strongly suggest D. pleuroptyx. ; Horizon—Lower beds. Figured specimen No. 27540, Walker Museum. Dalmanites slocomi sp. nov. Plate 71, figure 20 Description—Pygidium broadly triangular, moderately convex, ending posteriorly in a caudal spine. The dimensions of the type specimen are: Length 35 mm., width 45mm. Axis depressed, conical, margins tapering uniformly, apex rounded, extending to within 5 mm. from the posterior margin, marked by 15 or 16 low, somewhat flat CRUSTACEA. 267 annulations, which are separated by broad, shallow grooves. Surface ornamentation consisting of two rows of tubercles which become obseolete on the last three or four posterior annulations. Lateral lobes with 12 pleura which slope obliquely to the lateral ‘margins, the 7 or 8 anterior ones divided by distinct longitudinal furrows which persist to the end of each rib; extremities of ribs flattened to form a marginal border having:a uniform width of 2 mm., intervening furrows broad. Surface marked by indistinct pustules. ‘ Cephalon and thorax unknown. © Remarks—The form resembles Dalmanites multiannulatus Ohern, from the Mary- land Oriskany, but is smaller, has fewer axial and pleural segments, less distinct sur- face ornamentation, and it is especially characterized by the presence of a caudal spine. Horizon—Lower beds. Holotype No. 27535, Walker Museum. Name—This fossil is named after Mr. A. W. Slocom, of Walker Museum, Uni- veristy of Chicago. Dalmanites cf. stemmatus var. convergens Clarke Plate 71, figure 17 1892. Dalmanites sp. nov. A. var., Amer. Jour. Sci. 1892, p. 412. 1900. Dalmanites (Synphoria) stemmatus var. convergens Clarke, Mem. N. Y. State, Mus., vol. 3, No. 3, p. 19, pl. 2, figs. 3-5. Description—Pygidium triangular, slender and tapering, width greater than length. Axial * region with 12 flattened annulations, the posterior two scarcely discernible; intervening grooves narrow; pleural segments 10, each one divided by a narrow, faintly defined median furrow. Lateral margins gradually converging posteriorly, apparently terminating in a short caudal spine. Remarks—A single incomplete pygidium resembles the above species. The only difference observed is the presence of the faint median grooves on the pleural segments. Horizon—Upper beds. Figured specimen No, 27539, Walker Museum. Dalmanites sp. undet. Platé 71, figure 18 There is present in the collection a single specimen of the frontal margin of an unknown species of Dalmanites. The outer edge is coarsely denticulate, with 7 or 8 serrations, the two central ones being larger than the others. A resemblance is noted with the frontal margin of Dalmanites multiannulatus Ohern, but the Little Saline form is smaller, more evenly dentated, and the bifurcating process is less conspicuous. Horizon—Lower beds. ments Figured specimen No. 27537, Walker Museum. Dalmanites praenuntia sp. nov. Plate 71, figure 19 Description—Pygidium of medium size, broadly triangular in outline. The dimen- sions of the holotype are: Length 14 mm., width 20 mm. Axis attenuate, depressed convex, marked by 12 to 14 annulations; intermediate furrows narrow arid shallow. Lateral lobes with a corresponding number of ribs also separated by shallow furrows, each rib divided longitudinally by a fine median groove which bends posteriorly as it approaches the dorsal furrow. At the lateral margins the ribs are slightly flattened 268 THE DEVONIAN OF MISSOURI. forming a faint border. Posterior margin of pygidium terminating bluntly, and showing the beginning of two rudimentary spines. Cephalon and thorax unknown. Remarks—This species is represented by a single complete pygidium. It may be differentiated from all other associated Dalmanites by the character of the posterior margin of the pygidium. In this feature it seems to be a forerunner of such species as Dalmanites (Odontocephalus) aegeria Hall, Dalmanttes (Odontocephalus) coronatus Hall, or Dalmanites (Odontccephalus) selenurus Hall, of the New York and Ohio Onon- dagan fauna, which have the two posterior spines developed in a conspicuous manner. Horizon—Lower beds. Holotype No. 27536, Walker Museum. Genus Cryphaeus Green Cryphaeus sp. Plate 71, figure 21 Descriptton—Pygidium small, sub-oval, wider than long; the dimensions are: Length 9 mm., width 11°‘mm. The axial region is characterized by 7 well defined annulations, broad and rounded, each one bearing in the middle a faintly defined node; intervening grooves narrow and shallow. Pleural lobes moderately broad, sloping gradually toward the lateral margin to near the edge where they turn and bend dorsally; each lobe bears 5 annulations which terminate in spines, the character of which cannot be determined from the specimen. Each pleural segment is marked at the abrupt turn by a circular depression which probably represents the base of a short node. Two additional ones are present at the posterior of the pygidium, and from the base of each extends a short spine. Remarks—A single incomplete pygidium in the collection apparently represents an undescribed species of this genus. In general shape, character of pleura and spines, it resembles Dalmanites (Cryphaeus) comis, but differs in the larger size, in having an additional axial annulation, and in the presence of nodes at the ends of the pleural seg- ments. Horizon—Upper beds. Figured specimen No. 27547, Walker Museum. Genus Phacops Emmrich Phacops cristata Hall Plate 71, figures 23-25 1888. Phacops cristata Hall and Clarke, Nat. Hist. N. Y. Pal., vol. 7, p. 14, pl. 6, figs. 1-31, 16-29; pl. 8a, figs. 1-4. 1913. Phacops cristata Kindle, Geol. Surv., Md. Mid. Dev., p. 331, pl. 43, figs. 13-15. Descriptuon—Cephalon of medium size, semi-circular in outline, genal angles rounded. The dimensions of a nearly perfect head are: Length 16 mm., width 26 mm. Glabella large, width greater than length, moderately convex, narrow posteriorly, and rapidly expanding anteriorly, giving a subpentagonal outline. Anterior margin promi- nent and projecting beyond the frontal margin. Laterally the glabella is separated from the cheeks by deep, narrow furrows. The surface is marked by three pairs of glabellar furrows, the anterior and middle two scarcely perceptible, the posterior pair strongly marked, extending about half way across the glabella, and almost cutting off a narrow segment at the base of the head. Cheeks small, confined to the posterior portion of the cephalon, and bounded by a convex margin. Occipital furrow distinct, extending to, and merging in the marginal border. BIBLIOGRAPHY. ; 269 Eyes large, less elevated than the glabella, and not extending back to the line of the occipital furrow; composed of numerous rows of vertical lenses with hexagonal outline. Surface of glabella coarsely and strongly pustulose. Thorax not observed. A few fragmentary pygidia occur in the upper beds which are doubtfully referred to this species. They are semi-circular in outline, moderately convex, with axial lobe elevated and marked with 7 or 8 annulations. Pleural lobes with from 5 to 6 coarse ribs. Remarks—This species occurs more abundantly in the upper than in the lower beds, and is represented by numerous cephala, and by a few exfoliated pygidia. The _ characteristic stout spines of the genal angles have not been observed in the specimens examined. Their absence is probably due to the condition of preservation. Horszon—Lower and upper beds. Figured specimens Nos. 27541 and 27532, Walker Museum. Phacops sp. Plate 71, figure 26 Description—Pygidium small, semi-circular in outline. The dimensions are: Length 8 mm., width 13 mm. Axis prominent, narrow and tapering, with 7 rounded annulations, the two posterior ones indistinct; intermediate depressions shallow. Pleural lobes with 6 rounded segments also separated by shallow grooves. Horizon—Upper beds. Figured specomen No. 27533, Walker Museum. ‘ BIBLIOGRAPHY BY E. B. BRANSON. The titles of books and articles that bear directly on the Devonian of Missouri are included in this bibliography. The literature having to do with the fossils is listed in the synonomy to the various species. | Branson, E. B. The Devonian fishes of Missouri. Univ. of Mo. Bull., vol. 15, number 31 (Sei. series, vol. 2, number 4) pp. 59-74, 1914. . A four-mile section along the Missouri River south of Columbia, Mo. Abstract. Science, new series, vol. 37, p. 459, 1913. Devonian of central Missouri. -Abstract. Bull. Geol. Soe. Am. vol. 26, number 1, pp. 112-ff. 1915. Geology of Missouri: Mo. Univ. Bull., vol. 19, No. 15, 172 pp., 59 figs., May, 1918. >) A geologic section from 40 miles west of St. Louis to Jackson County, : Missouri. Am.-Jour. Sci., vol. 49, pp. 267-278, Apr., 1920. Branson, E. B. and Greger, D. K. Devonian of central Missouri (abstract): Geol. Soc. America, Bull., vel, 26, No. 1 p.112, 1915. Broadhead, G. C. Geological report on the country adjacent to the Pacific Railroad, from Sedalia to Kansas City: Geol. Survey Missouri, pt. 2 (p. 158), 1873. Warren County: Geol. Survey Massouri, Report, 1855-71, pp. 37-64, (46-48), 1873. Geol. Survey Missouri: 1873-1874 (pp. 27 and 324), 1874. 270 THE DEVONIAN OF MISSOURI. On the well at the insane asylum, St. Louis County, Missouri: St. Louis Acad. Sci., Trans., III, pp. 216-223, pl. 16, 1878. The geological history of the Ozark uplift: . American Geologist, III, No. 1, pp. 6-13, January, 1889. 3 A critical notice of the stratigraphy of. the Missouri Paleozoic: American Geologist, XII, pp. 74-89, 1893. Geological history of Missouri Paleozoic: American Geolopist, XIV, pp. 380-388, 1894. . <7 The Ozark uplift and growth of the Missouri Paleozoic: Geol. Survey Missouri, XII, pt. 3, pp. 391-409, 1898. The geology of Boone County: Geol. Survey Missouri, XII, pt. 3, pp. 375-388, pls. 12-13, 1898. Buckley, E. R. Geology of the disseminated lead deposits of St. Francois and Washington counties: Missouri Bureau Geol. and Mines, 2nd ser., IX, pt. 1, p. 65. Buckley, E. R., and Buehler, H. A. Quarrying industry of Missouri: Missouri Bureau Geol. and Mines, 2d ser., II, pp. 52-60 (57), 1904. : Buehler, H. A. Lime and cement. resources of Missouri: Missouri Bureau Geol. and Mines, 2d ser., VI, 255 pp., 36 pls. (229), 1907. Crane,G. W. ‘ The iron ores of Missouri: Missouri Bureau Geol. and Mines, X, 2d ser. (p. 48). Dake! CA Ti The sand and gravel resources of Missouri. Missouri Bur. Geol. and Mines, vol. 15, 1918. Dunbar, Carl O. Stratigraphy and correlation of the Devonian of Western Tennessee: Am. Jour. Sci., 4th series, vol. 46, pp. 732-756, December, 1918. Tennessee State Geol. Survey, Bull. 21, pp. 1-127, 1919. New species of Devonian Fossils from Western Tennessee: Trans. Conn. Acad. Aci., vol. 23, pp. 109-158, 1920. Emerson, F. V. ; Geography of Missouri: Univ. of Missouri Bull., Educational series, I, No. 4, 74 pp., 1912. Gallaher, drAn= Preliminary report of the Wetontecaits and economic geology of Missouri: Missouri Bureau Geol. and Mines, 259 pp., pls. 1-58, figs. 1-6, and 9 vertical sections, Geol. Surv. Missouri, XU, (pp. 151-154, pls. 41-43), 1900. Grabau, A. W. j ; Types of sedimentary overlap: Geol. Soc. America, Bull., XVII, pp. 567, 17 figs., 1906. Physical and faunal evolution of North America during Ordovicie, Silurie and early Devonic time: Jour. Geol., XVII, pp. 209-252, 11 figs., 1909. Principles of ateneuariigs if ee pp., 263 figs., New York, A. G. Seiler & Company, 1913. North American continent in upper Devonie time (shistenesy: Science, new ser., XLI, pp. 509-510 (abstract and discussion) Geol. Soc. America, Bull., XX VI, No. 1, pp. 88-90, 1915. f : ¥ j y i BIBLIOGRAPHY. 271 Grabau, A. W., and Shimer, H. W. North American index fossils: invertebrates: New York, A. G. Seiler & Company, I, Protozoa, Hydrozoa, Anthozoa, Bryozoa, Brachipoda, Pelecypoda, Scaphopoda, and Gastropoda, VIII, 853 pp., 1,210 figs., 1909. North American index fossils; invertebrates: II, New York, A. G. Seiler & Company, XV, 909 pp., 726 figs., 1910. Greger, D. K. A new Devonian brachiopod retaining the original color markings: Am. Jour. Sci., 4th ser., XXV, pp. 313-314, 7 figs., 1908. The Devonian of central Missouri: Am. Jour. Sci., 4th ser., XXX, pp. 374-378, 1909. On the retention of the original color ornamentation in fossil brachiopods: Nautilus, XXVIII, No. 8, pp. 93-95, 1914. Devonian of central Missouri (abstract): See Branson and Greger, 1915. Devonian of central Missouri: Fauna of the Cooper Limestone.—Bull. Geol. Soe. Am., XXVIII, p. 209 (abstract), 1917. The Devonian of Central Missouri, IJ, Am. Jour. Sci., 4th ser., XLIX, 1920, pp. 265-266. 2 The Devonian of central Missouri (III): The Cooper Limestone, Am. Jour. Sci., 4th ser., L, 1920, pp. 20-24. Hall, James. Preliminary notice of Newberria, a new genus of brachiopods: ING OY. State Geol., 10th Ann. Rert., pp. 91-98, pl. 5, 1891. Hall, James, and Clark, John M. An introduction to the study of the genera of Paleozoic Brachiopoda: Nat. Hist. of N. Y., Paleontology, VIII, pt. 2, pp. 1-394, pls. 21-84, (pl. 78, figs. 21-23), 18938. Hall, James, and Whitfield, R. P. Descriptions of new species of fossils from the Devonian rocks of Iowa. New York State Cabinet of Nat. Hist. 23d Ann. Rept. pp. 223-243, pls. 9-12, 1873. Mienshay. Osear H. The Devonian series in southwestern Missouri: American Geologist, XVII, pp. 294-300, 1895. Keyes, C. R. Principal Mississippian section: Bull. Geol. Soc. America, III, pp. 283-300, 1892. Classification of Lower Carboniferous rocks of pie aia Valley, Pam- phlet, 24 pp., Washington, 1892. Present basal line of delimitation of Carboniferous in northern Missouri: Am. Geol., X, pp. 380-384, 1892. Paleontology of Missouri, Part I: Geol. Surv. Mo., IV, 271} pp., pls. 1-32,. figs. 1-9, with geologic map of state, 1894. Paleontology of Missouri, Part II: Geol. Surv. Mo., V, 266 pp., pls. 33-56, figs. 10-11, 1894. Characteristics of Ozark Mountains: Geol. Surv. Mo., VIII (339, 340 and 348), 1895. Thickness of the Paleozoic rocks of the Mississippi Basin: Am. Geologist, XVII, pp. 169-173, 1896. Geological occurrence of clays (in Missouri): Geol. Surv. Mo., XI, (pp. 41-42, pl. 78, figs. 21-23), 1896. Bibliography of Missouri geology: Geol. Surv. Mo., IX, pp. 221-523, 1896. 272 THE DEVONIAN OF MISSOURI. Relations of the Devonian and Carboniferous in the Upper Mississippi Valley: Trans. St. Louis Acad. Sci., III, pp. 357-369, 1897. Vertical range of fossils at Louisiana: Proc. Iowa Acad. Sci., IV, pp. 26-41, 1897. ; Some geological formations of the Cap-au-Gres uplift: Proc. Iowa Aead. Sei., V. pp. 55-58, 1898. Kinderhook stratigraphy: Jour. of Geol.. VIII, pp. 315-321, 1900. Devonian interval in Missouri: Bull. Geol. Soc. America, XIII, pp. 267-292, 1902. : : Devonian hiatus in continental interior; its character and depositional equivalents: Proc. Iowa Acad. Sci., 1X, pp. 105-112, 1902. Nether delimitation of our Carbonic rocks: Proc. Iowa Acad. Sci., XIX, pp. 153-154, 1913. ace Marked unconformity between Carboniferous and Devonian strata i upper Mississippi Valley: Am. Jour. Sci., 4th ser., XXXVI, pp. 160-164, 1 fig., 1913. Paleogeographical affinities of the Alexandrian series: Am. Jour. Sci., (4), XX XVII, pp. 254-256, 1914. Scheme of the stratigraphic succession in Missouri: Pamphlet, 4 pages, Des Moines, 1915. Terranal affinities of original Chouteau limestone: Iowa Acad. Sci., Proe., XXIII, pp. 113-118, 2 figs., 1916. Foundation of exact geologic correlation: Proc. Iowa Acad. Sci., XXII, pp. 249-267, (253), 1916. Extent and age of Cap-au-Gres fault: Proc. Iowa Acad. Sci., XXIV, pp. 61-66, 1918. ; Kindle, E. M. A eatalogue of the fossils of Indiana, accompanied by a bibliography of the literature relating to them: Indiana Dept. of Geol. and Nat. Res., 22d Ann. Rept., pp. 407-514, 1898. The Devonian and Lower Carboniferous faunas of southern Indiana and central Kentucky: Am. Pal. Bull. No. 12, 112 pp., 1899. The Devonian fossils and stratigraphy of Indiana. Ind. Dept. of Geol. : and Nat. Res., 25th Ann. Rept., pp. 529-763, 31 pls., 1901. The fauna and stratigraphy of the Jefferson limestone in the northern Rocky Mountain region: Bull. Amer. Pal., IV, No. 20, 39 pp., 4 pls.; 1908, The Devonian fauna of the Ouray limestone: U. S. Geol. Survey, Bull. 391, 60 pp., 10 pls., 1909. _ The southerly extension of the Onondaga sea in the Allegheny region: Jour. Geol., XIX, pp. 97-103, 1911. The Onondaga fauna of the Allegheny region: U.S. Geol. Survey, Bull. 508, .144 pp., 13 pls., 1912. The stratigraphic relations of the Devonian shales of northern Ohio: Am. Jour. Sci., 4th ser., XXXIV, pp. 187-213, 3 figs., 1912. ; Notes on Devonian faunas of the MacKenzie River valley: Am. Jour. Sci., 4th ser., XLII, pp. 246-248, 1 fig., 1916. Marbut, C. F. The Geology of Morgan County (Missouri): Missouri Bureau Geol. and Mines, VII, 2d ser., 97 pp., (49), 1908. . Meek, F. B. Moniteau County: Geol. Surv. Mo., lst and 2d Ann. Repts., pt. 2, pp. 95-119, (103-105), 1855. Saline County: Geol. Surv. Mo., 1855-1871, pp. 157-188, (174-178), 1873. BIBLIOGRAPHY. 273 Meek, F. B. and Worthen, A. H. Geol. Surv. Illinois, III, pp. 268-382, 1868. Owen, David Dale. Report of a geological survey of Wisconsin, Iowa, and Minnesota, and, incidentally, of a portion of Nebraska Territory, XX XVIII, 638 pp., geological maps, “aes (p. 99), 1852. Potter, W. B. Geology of Lincoln County: Geol. Surv. Missouri, pt. 2, preliminary report on Iron Ores and Coal Fields, (pp. 242-245), 1873. Rowley, R. R. The Hamilton beds of Callaway County, Missouri: Am. Geol., XII, pp. 203-205 (correspondence), September, 1893. Description of some new species of crinoids, blastoids, and brachiopods from the Devonian and sub-Carboniferous rocks of Missouri: Am. Geol., XII, pp. 303-309, November, 1893. New species of crinoids and brachiopods from the Missouri Hamilton: Am. Geol., XIII, pp. 151-154, figs. 1-10, March, 1894. Description of a new genus and five new species of fossils from the Devonian and sub-Carboniferous rocks of Missouri: Am. Geol., XVI, pp. 217- 223, October, 1895. Description of new species of fossils from the Devonian and sub-Carboni- ferous rocks of Missouri: Am. Geol., XXV, pp, 261-273, pl. 5, May, 1900. ; Geology of Pike County: Missouri Bureau Geol. and Mines, VIII, 2d series, (pp. 24-26), August, 1908. Sampson, F. A. A Bibliography of the geology of Missouri: Geol. Surv. Missouri, Bull. 2, 158 pages, 1890. Savage, T. E. Lower Paleozoic Stratigraphy of Bontimenicra Illinois: Am. Jour. Sci., 4th ser., X XV, pp. 431-443, 1908. Ill. State Geol. Surv., Bull. No. 8, pp. 103-116, (p. 107), 1908. The Grand Tower (Onondaga) formation of Illinois, and its relation to the Jeffersonville beds of Indiana: Ill. State Acad. Sci., Trans., ITI, pp. 116-132, 1910. Alexandrian series in Missouri and Illinois: Bull. Geol. Soc. Am., XXIV, pp. 351-376, (p. 357), 1912. Stratigraphy and paleontology of the Alexandrian series in Illinois and Missouri: Ill. State Geol. Surv., Bull. 23, pp. 67-160, pls. 3-9, (py 72), 1917. Sehuchert, Charles. List of species of the American Paleozoic Orthis, Spirifera, Spiriferina and Syringothyris: Ninth Ann. Rep., N. Y. State Geol., pp. 1-20, 1890. A synopsis of American fossil Brachiopoda, including bibliography and synonymy: U.S. Geol. Survey, Bull. 87, 464 pp., 1 pl., 1897. On the faunal provinces of the Middle Devonie of American and the Devonic coral sub-provinces of Russia, with two paleographic maps: Am. Geol., XXXII, pp. 137-162, 2 pls., 1903. Paleogeography of North America: Geol. Soc. America, Bull., XX, pp. 427-606, 56 pls., 1910. On the brachiopod genus Syringothyris in the eeuhink of Missouri: Am. Jour. Sci., 4th ser., XXX, pp. 223-224, 1910. 10 274 THE DEVONIAN OF MISSOURI. The delimitation of the geologic periods illustrated by the paleogeography | of North America: Int. Geol. Cong., XII, Canada, 1913, pp. 555- 591, 2 pls.;, 1914. : Climates of geologic time: Carnegie Inst., Washington, Publ. No. 192, pp. 265-298, 4 figs. (inel. paleogeographie maps), 1914. Shepard, Edward M. Underground waters of Missouri, Water Supply and Irrigation Paper, No. 195, U. S. Geol. Surv., 1907. A report on Greene County: Geol. Surv. Missouri, XII, pp. 13-245, map, (pp. 65-82), 1898. : Shumard, B. F. Geological section, on the Mississippi River from St. Louis to Commerce: Geol. Surv. Missouri, Ist and 2d Ann. Rept., pp. 150-152, 1855. Jefferson County: Geol. Surv. Missouri, Report, 1855-71, pp. 304-313 (p. 306), 1873. Cape Girardeau County: Geol. Surv. Missouri, Report 1855-71, pp. 258-276. (pp. 261-263), 1873. Ste. Genevieve County: Geol. Surv. Missouri, Report, 1855- 71, pp. 290- 303, (p. 296), 1878. Perry County: Geol. Surv. Missouri, Report 1855-71, pp. 277-289, (pp. 280-281), 1873. Springer, Frank. The Crinoidea Flexibilia, with an ee of A. B. C. and 76 plates: Smithsonian Inst., pub. 2,501, 1920. The fossil crinoid genus Dolatocrinus and its allies: ".U. S. Nat. Mus. Bull. V5b-1920. Stuart, Alban. Geological section at Providence, Missouri: Kansas Univ. Quart., IV, pp. 161-162, Lawrence, 1896. Swallow, G. C. ; Geol. Surv. Missouri, Ist and 2nd Ann. Rept., pp. 106-109 and 196, 1855. Description of new fossils from the Carboniferous and Devonian of Missouri: Trans. St. Louis Acad. Scei., I, pp. 635-651, 1860. Ulrich, E. O. ; Revision of the Paleozoic Systems: Geol. Soe. America, Bull., XXII, pp. 281-680, 1911. The Chattanoogan series with special reference to the Ohio shale problem: Am. Jour. Sei., 4th ser., XXXIV, pp. 157-183, 3 figs., 1912. Kinderhookian age of the Chattanoogan series: Geol. Soc. America, Bull., XXVI, No. 1, pp. 96-99, 1915. Correlation by displacements of the strand line and the function and proper use of fossils in correlations: Geol. Soe. America, Bull., XXVII, No. 3, pp. 451-490, 1916. Wachsmuth, Charles, and Springer, Frank. The North American Crinoidea Camerata:, Mem. *Mus. Comp. Zool. Harvard College, vols. 20 and 21, 1897. Weller, Stuart. A circum-insular Paleozoic fauna: Jour. Geol., III, pp. 903-917, 1895. Correlation of the Devonian faunas in southern Illinois: Jour. Geol., V, pp. 625-635, 1897. A peculiar Devonian Deposit in Northeastern Illinois; Jour, Geol., VII, pp. 483-488, 1899. BIBLIOGRAPHY. ZU The composition, origin and relationship of the Corniferous fauna in the Appalachian province in North America: Jour. Geol., X, pp. 423- 432, 1902. Correlation of the middle and upper Devonian and the Mississippian faunas of North America: Jour. Geol., XVII, No. 3, pp. 257-285, 1909. Western extension of some Paleozoic faunas in southeastern Missouri: Geo. Soe. America, Bull., X XV, No. 1, pp. 135-136, 1914. Former extension of the Devonian formations in southeastern Missouri: Geol. Soe. America, Bull., XX VII, No. 1, p. 160, 1916. Wheeler, H. A. Clay deposits: Geol. Surv. Missouri, XI, pp. 403-404, 429, 1896. Williams, H. S. Correlation papers: Devonian and Carboniferous: U.S. Geol. Survey, Bull., No. 80, 279 pages, 1891. Seope of paleontology and its value to geologists: Am. Geologist, X, pp. 148-169, 1892. (167.) On the recurrence of Devonian fossils in strata of Carboniferous age: Am. Jour. Sei.. 3rd ser., XLIX, pp. 94-101, 1895. Devonian interval in northern Arkansas: Am. Jour. Sci., 4th ser., VIII, pp. 139-152, 1899. Migration and shifting of Devonian faunas: Geol. Soc. America, Bull., XXI, pp. 285-294, 1910. 276 THE DEVONIAN OF MISSOURI. DEVONIAN OUTLIER NEAR ROLLA, PHELPS COUNTY. The recent discovery of an outlier of Devonian near the crest of the Ozark uplift has added new and important data on the geologic history of the Ozark region. It indicates that the Devonian seas extended to a much greater distance over the uplift than has formerly been suspected. The following con- densed description is taken from the Journal of Geology.! Location and General Description.—The Devonian outlier lies about 114 miles northwest of Rolla, in the N. E. 4 N. W. 14 Sec. 3, T. 37 N., R. 8 W. It is on the east side of the road and hes fifty feet below the crest of the ridge. It occupies a little knoll between two gullies, and when first found consisted of a number of knobs of quartzite projecting from the hill and having a rough alignment. The base was concealed, but just above the top of the outlier were a number of Mississippian boulders, and on the north, west and south at higher and lower levels are out- crops of the Jefferson City formation. The summit of the ridge is capped by a thin stratum of Pennsylvanian sandstone, and boulders of Pennsylvanian float are found in abundance at lower levels. The Pennsylvanian rests unconformably upon the Jefferson City formation on the east side of the hill. On the west side there appears to be a thin stratum of Mississippian between them, but the exposures are very poor, and the exact relationships are difficult to determine. An excavation was made along the side of these quartzite masses in an attempt to expose the lower contact. This was not entirely successful, but the excavation showed that there was a continuous ledge of quartzite at least thirty feet long and from three to six feet in thickness, increasing in thickness toward the east. Beyond the limits of the excavation there are a few - other knobs of quartzite, probably continuous with the part just described. This makes the total length of the outlier about fifty feet, and its greatest width slightly less. Lithologic_ Characteristics —Lithologically the Devonian rock is a hard, dense quartzite breaking with a splintery fracture. In color it ranges from white through gray to bluish and almost black. The lighter shades predominate. Thin sections show 1Bridge, Josiah, and Charles, B. E. A Devonian outlier near the crest of the Ozark uplift. Jnl. Geol. XXX, p. 450-458 DEVONIAN OUTLIER NEAR ROLLA. yes great numbers of well-rounded quartz nuclei with strong evidences of secondary growth. Insome sections the grains show as angular interlocking crystals because of this secondary growth; in other sections, large secondarily enlarged grains are separated from each other by a finely crystalline ground mass of the same material. The rock contains numerous cavities, most of which have been formed by the leaching out of large fossils, and on the surfaces of these cavities are to be found many small but perfect crystals of quartz and of limonite pseudomorphous after pyrite. The quartzite is somewhat fractured, and these fractures are filled with a soft, yellow, non-fossiliferous, somewhat con- glomeratic sandstone. From the structure and secondary growth it seems evident that the rock was originally a calcareous sandstone, ‘laid down by.an advancing sea against an old land mass. The calcareous matter has been completely leached out, and much of it re- placed by silica. The soft, yellow sandstone is of later age, either basal Mississippian or Pennsylvanian. Paleontology.—Fossils are abundant in the quartzite. They are not evenly distributed, but are most abundant at the base. At the first glance, parts of the stratum appear to be barren, but careful search of almost any fragment will reveal fossils. The fos- sils all occur as external and internal molds, and in most cases the preservation. is excellent. Corals and Mollusca dominate the fauna. Other forms are not common, though individuals of a given species may be very abundant. The following table gives a ‘ist of the species which have been obtained from this quartzite, and also their occurrence at other localities. Column 1 shows species occurring in the Grand Tower formation in southern Illinois; column 2, species occurring in the Jeffersonville beds at Louisville, Kentucky; column 3, species occurring in Michigan; column 4, species occurring in Ohio; and column 5, species occurring in New York. 278 THE DEVONIAN OF MISSOURI. List of Species identified from the Devonian Quartzite at Rolla, Missouri 2 $ 5 1 Ken- | Mich- 4 New Illinois | tucky igan- | Ohio York Coelenterata: Zaphrentis gigantea, Lesueur. Secret Zaphrentis A pices Mee ase | ee os Zaphrentis sp. Aiest-1 aurea ac" ~ Acervularia rugosa i ruts iH. - NS Re. x Amplexus yandelli (E, and H.).-. x Favosites winchelli, Rominger...... . j Favosites emmonsi, Rominger...... . x Favosites basalticus, Goldfuss.......|.... Favosites turbinatus (?) Billings.....|........ x Favosites bmitaris, Rominger.......|........ x x x nm Ow ~ mw ww wm ee 7 Favosites clausus, Rominger........|........ Cladopora labiosa (Billings)........|........ Molluscoidea: Cystodictya gilberti (?) Meek....... Stropheodonta demissa (Conrad)... . Rhipidomella vanuxemi, Hall....... Centronella glansfagea, Hall........ Eunella (?) sp. . ei Meee ae nen Bact r|.g 8 Spirifer aierindins, fell LAS HES eee are Spirifer grieri (2), Hall. Re ACR AE x Martinia mata (?) (pillinesy. ariel Nucleospira concinna, Hall........ z x Mollusca: Acinodesma occidentale (?), Hall... . Conocardium cuneus (Conrad)...... Conocardium ohioense, Meek.......|........ x Bellerophon pelops, Hall........... x x Bellerophon newberryi, Meek. ... 2. .|. 0.06.0. ]. 0. cece [ee eee Hormotome- mata, Falli.siotae 2 acts nal. de bel eer eye sae ieee too cd ee ee eee Igoceras conicum (Hall)........... x Loxonema robustum (?), Hall.......]........|..... 0% Cyclonema crenulata, Meek........|........ Callonema bellatula, Hall.......... Ae Callonema humile, Meek..........s|.-...... Callonema, conds., Koardle ae eae ars ailtem eel eee Tentaculites scalariformis, Hall... .. x Coleolus tenuicinctum, Hall........ x Orthoceras sp... Gomphoceras a (2).. a. Zittleoceras nereus, Falls bg ab Mec slit ae ys el ee Ae Arthropoda: PNOGCOPNGHESTOEC,. tle lager hk cee aes Proetus clarus, Hall.... eet are Dalmanites calypso, Hall......... mw KM mM ow bet fa ee a eae ie tee nw S sm al a AK Km Pie Moe -*H indicates that species occurs in the Hamilton at that particular locality, —— DEVONIAN OUTLIER NEAR ROLLA. 279 Correlation.—From the foregoing table it is evident that this fauna is of Onondaga age, and that it is the partial equiva- lent of the Grand Tower formation of southern Illinois and south- eastern Missouri. Its affinities are entirely with the eastern Devonian and have no resemblance to the later Devonian faunas of Iowa and north central Missouri. Of the thirty-seven identi- fied forms, seventeen occur in the Grand Tower formation of southern Illinois, thirty in the Jeffersonville beds of southern Indiana, thirteen in the Onondaga group of Michigan, twenty-two in the Onondaga of Ohio and eighteen in the Onondaga of New York. These figures are not exact and are probably too low, for the faunal lists from the various regions are incomplete and represent compilations in most cases. The most complete lists are those from the Grand Tower formation and from the Jeffer- sonville beds. Weller and Savage have shown the relationship of the Grand Tower fauna to the Onondaga of the eastern United States. Savage has also shown that the Jeffersonville beds are the equivalent of the upper portion of the Grand Tower of Illinois. Since more than 80 per cent of the forms occurring at Rolla are also found in the Jeffersonville beds, it seems certain that this outlier belongs to the upper portion of the Grand Tower forma- tion. Certain horizons in this formation are reported to be full of corals, but until the faunal lists for this formation are com- pleted, a closer correlation cannot be made. Conclusions——The presence of a Grand Tower outlier at Rolla indicates a much greater submergence of the Ozark upl ft during Onondaga time than has commonly been supposed. The nearest outcrops of the Grand Tower formation are at least 100 miles to the east. The St. Francois Mountains, the structural center of the uplift, are directly between the two exposures, and it is not believed that these were covered in Devonian time. In view of the thinning out of the Devonian to the north, it may be assumed that the Onondaga sea extended westward along the southern border of the St. Francois Mountains, and that it may have covered much of the southern portion of the uplift. Further field work may reveal other outliers, which will enable the boundaries of this sea to be traced more definitely. y es pact ! te Ege bate ey b ¢ — “je ‘t ; ~ 2 e sh es 11 PLATE NO. 1 PEALE i: Cyathophyllim halli (Edwards and Haime) — Page 49. Fig. 1. A much-weathered specimen. About two-thirds natural size. (Callaway limestone of Boone County.) Chonophyllum ellipticum Hall and Whitfield Page 51. Fig. 2. A large specimen from the Snyder Creek shale. Figs. 3 and 5. Other specimens from the Snyder Creek about 34 natural size. Fig. 4. An average specimen from the Callaway limestone. (X 4/5.) Streptelasma cooperensis Branson Page 48. Figs. 6 and 7. Specimens from the Cooper limestone near Lupus. About 34 natural size. Missourt BuREAU OF GEOLOGY AND MINES. Vou, XVII, 2np Swriss, Puate i. rd é . ;. + eS a ‘ ae Ge Ree haere ss PLATE NO. 2 f - Nn PEATE. Favosites alpenensits Winchell Page 53. Fig. 1. | Almost spherical corallum from the Mineola of Ralls County. Fig. 2. An elongate corallum from the Mineola of Ralls County. Fig. 3. A corallum from the Mineola of Ralls County. About 3 natural size. Favosites sp. undet. Figs 4and5. Top and side views of acorallum. (Devonian of Callaway County, for- mation uncertain.) (X 2/3.) Chonophyllum ellipticum Hall and Whitfield Page 51. Fig. 6. Inside of the cup of the specimen shown in figure 2, of plate 1. VoL EXVII, 2ND SERIES, PLATE 2, Missourt BurREAvU OF GEOLOGY AND MINEs, PLATE NO. 3 Meck Fig. 1. Fig. 2. Fig. 3. Fig. 4. PLATE °3 Favosites limitaris Rominger Page 54. - A mass of rock containing several branches. (Callaway limestone of Boone County.) Ceratopora snyderensis Branson Page 56. An average specimen (X 4/5). (Snyder Creek shale of Callaway County.) Gen. and sp. undet. (See plate 4, figs. 5 and 6.) (Snyder Creek shale of Callaway County.) Diplophyllum callawayensis Branson Page 50. . An exfoliated colony about 4/5 natural size. (Callaway limestone of Boone County.) Ceratopora grabaut Branson Page 56. The usual occurrence of the species. (Mineola limestone of Montgomery County.) oe Missourt Bureau OF GEOLOGY AND MINES. Vou, XVII, 2ND SERIES, PLATE 3. PLATE NO. 4 PLATE 4 Stromatopora solidula Hall and Whitfield Page 56. Fig. 1. A small part of a surface about 10 times natural size. (Snyder Creek shale of Callaway County.) Ceratopora grabaui Branson Page 56. Fig. 2. A specimen from which most of the branches are missing. About twice nat- ural size. (Mineola limestone of Montgomery County. ) Fig. 3. A vertical section about twice natural size. Aulopora repens Knorr and Walch Page 55. Fig. 4. A fragment on Stropheodonta demissa (Conrad). (Snyder Creek shale of Callaway County.) Gen. and sp. undet. ; Figs. 5 and 6. Vertical and cross-section of fragment from the Snyder Creek shale. (X6.) Lioclema occidens (Hall and Whitfield) Page 69. Figs. 7 and 8. Vertical and cross-sections of zooecia. (X 30.) (Snyder Creek shale of Callaway County.) Acervularia davidsonit Edwards and Haime Page 52. Figs. 9 and 10. Small areas enlarged about 6 times. (Callaway limestone of Boone County.) Missouri BurEAv oF GEOLOGY AND MINEs. Vou. XVII, 2ND SERIES, PLATE 4, PN aed | om - i hia NITTZ as i PLATE NO. 5 PLE Stromatopora solidula Hall and Whitfield Page 56. Figs. 1, 2, 4, 5. Colonies of various shapes. (X 1.) Fig. 3. The base of a colony that formed on a gastropod. Fig. 6. Base of a colony with wrinkled epitheca. (Snyder Creek shale of Callaway County.) Missourrt BuREAU OF GEOLOGY AND MINES. Vou, XVII, 2Np SERIES, PLATE 5. PLATE_NO. 6 PEATE Megistocrinus missouriensis Branson and Wilson Page 66. Fig. 1. Basal view of the holotype. (Mineola limestone of Montgomery County.) Megistocrinus mineolaensis Branson and Wilson Page 66. Figs. 2-4. Top, side, and basal views of the holotype. ‘(Mineola limestone of Ralls County.) Stereocrinus moort Branson and Wiison Page 62. Fig. 5. Basal view of one of the cotypes. Fig. 6. Top view of a cotype which has clear sutures. About one-third broken away. (Mineola limestone of Ralls County.) Melocrinus lylit Rowley Page 59. Figs. 7 and 8. Side and top views a the holotype. (Collection of R. R. Rowley. Snyder Creek shale of Callaway County.) Spirorbis omphaloides (Goldfuss) Page 57. Figs. 9 and 10. Views of two average specimens. (X5.) (Snyder Creek shale of Callaway County.) Missourrt BUREAU OF GEOLOGY AND MINES. Vou, XVII, 2Np SERIES, PLATE 6, PLATE NO. 7 jPALIANI 7 Stereocrinus springert Branson and Wilson Page 63. Figs. 1-3. Side, basal, and top views of the holotype. (Mineola limestone of Ralls County.) Dactylocrinus concavus (Rowley) Page 67. Figs 4 and 5. Basal and side views of the type specimen. (Collection of R. R. Row- ley. Snyder Creek shale of Callaway County.) Stereocrinus vandivert Branson and Wilson Page 63. Figs. 6-8. Anal side, top, and basal views of a cotype. The top is somewhat weathered. Some sutures near the margin are indistinct and others cannot be made out. (Mineola limestone of Ralls County.) Melocrinus tersus Rowley Page 60. Figs. 9 and 10. Side and top views. (Collection of R. R. Rowley. Snyder Creek shale of Callaway County.) Melocrinus gregert Rowley Page 59. Figs. 11 and 12. Side and top views of a specimen from the type locality. (Snyder Creek shale of Callaway County.) Missouri BurEAv or GEOLOGY AND MINEs. Vou. XVII, 2np Series, PLATE 7, 3 -‘: nit PLATE NO. 8 PLATE 8 Megistocrinus missouriensis Branson and Wilson Page 66. Fig. 1. Top view of the holotype. Fig. 2. Side view of the holotype. The margin is somewhat distorted, but the de- cided upturning in the anal area seems to be normal. (Mineola limestone of Montgomery County.) Nucleocrinus verneuili (Troost) Page 57. Fig. 3. Top view of an interior mould. (X2.) Fig. 4. | Side view of an interior mould. (Mineola limestone of Montgomery County.) Megistocrinus broadheadi Branson and Wilson Page 65. . Fig. 5. Top view of the holotype. Fig. Basal view of the holotype. Fig. Side view of the holotype. (Mineola limestone of Montgomery County.) “sD Stereocrinus moort Branson Page 62. Fig. 8. View of the anal area turned slightly to the right of center. Specimen slightly broken. (Mineola limestone of Ralls County.) Vou, XVII, 2NpD SERIES, PLATE 8. Missourrt BuREAU OF GEOLOGY AND MINEs, 12 PLATE N@; 9 Fig. Fig. 3 Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. ee 10. ii 12, ils}s 14. iS) PLATE:9 Cystodictya mineolaensis Branson Page 71. A form with frequent branching. (X3.) A form with few branches. (X3.) (Mineola limestone near Mineola, Missouri.) Coscinium missouriensis Branson Page 71. Surface of a zoarium (X7). (Mineola limestone near Mineola, Missouri.) Rhombopora missouriensis Branson Page 70. Part of a branch (X7). (Snyder Creek shale of Callaway County.) Cyclotrypa communis Ulrich Page 68. Surface of a small part of a zoarium. (X7). Vertical section. (X5). Tangential section, not passing through a macula. (X5). (Mineola limestone near Mineola, Missouri.) Hemitrypa mineolaensis Branson Page 70. The superficial network with a portion of the zoarium. (X15). Non-celluliferous face of a portion of a frond. (X5). Celluliferous face of a portion of a frond. (X5). (Mineola limestone near Mineola, Missouri.) Fenestella missouriensis Branson Page 69. Non-celluliferous face. (X5). Celluliferous face. (X5). (Mineola limestone near Mineola, Missouri.) Lioclema occidens (Hall and Whitfield) Page 69. A small part of a zoarium, including one of the large pores. (X8). (Snyder Creek shale of Callaway County.) Cyclotrypa magna-monticulata Branson Page 68. Surface of a zoarium, including a macula. (X3). Vertical section. (X7). Tangential section. (X7). (Mineola limestone near Mineola, Missouri.) Missouri BurEAv oF GEOLOGY AND MINES. Vou. XVII, 2np Serres, PuatE 9, P=} \ as ry ELE 7 te = t) DRL iy Gal ee SMR eed PLATE NO. 10 Fig. 1. Fig, 3. Fig. 6. Fig. 2. Hig, 5. Figs. 4 and 7. Two common types of zoaria. PLATE 10 Cyclotrypa magna-monticulata Branson Page 68. - A fragment showing wrinkled epitheca. A fragment showing projecting monticules. An impression showing monticules as depressions. (Mineola of Montgomery County.) Rhombopora mtssouriensis Branson Page 70. A fragment of the Rhombopora bed of rock. (Snyder Creek shale from Craghead Creek, Callaway County.) Hemitrypa mineolaensis Branson Page 70. An impression of a zoarium. (Mineola of Montgomery County.) Lioclema occidens (Hall and Whitfield) Page 69. (Snyder Creek shale of Callaway County.) Vor, XVII, 2Np SERIES, PLATE 10, Missourt BuREAU OF GEOLOGY AND MINES. PLATE NO; 11 PLATE. 11 Crania famelica H. and W. Page 72. Figs. 1 and 2. Top and side views of an average specimen. (X11). Fig. Fig. Fig. Fig. aihig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. 10. 16. iil 12. 13. 14. Se (Snyder Creek shale from Callaway County.) Stropheodonta demissa (Conrad) Page 77. An interior of a pedicle valve. (Snyder Creek shale of Callaway County.) A small specimen with the beginning of the arrangement of plications in bun- dles which culminated in S. mineolaensis Branson (X2). (Mineola limestone of Montgomery County.) Schizophoria propinqua (Hall) Page 74. A small specimen of pedicle valve. (X2.) (Mineola limestone of Montgomery County.) Schuchertella cf. pandora (Billings) Page 84. A small pedicle valve. Posterior view of an imperfect pedicle valve. (Mineola limestone of Montgomery County.) Stropheodonta navalis Swallow Page 82. Plications and punctation of an average specimen. (X5). (Snyder Creek shale of Callaway County.) Stropheodonta equicostata Swallow Page 79. Plications and punctation of an average specimen. (X5). (Snyder Creek shale of Callaway County.) Pholidostrophia towaensis (Owen) Page 82. Interior of a small brachial valve. (Mineola limestone of Montgomery County.) Productella callawayensis (Swallow) Page 85. A small pedicle valve. A pedicle valve of medium size with spines unusually preserved. (Snyder Creek shale of Callaway County.) Stropheodonta boonensis (Swallow) Page 75. Plications and punctation of an average specimen. (X5.) (Snyder Creek shale of Callaway County.) Strophonella crassa (Rowley) Page 83. Side view of type. Brachial view of type. Posterior view of type. (Snyder Creek shale of Callaway County.) Stropheodonta inequiradiata Hall Page 80. Details of plications and striations. (Mineola limestone of Montgomery County.) 4 : as. PLATE NO. 20 PLATE 20 Syringothyris n. sp. Page 104. Figs. 1 and 2. Side and posterior views of an imperfect mould. , (Mineola of Montgomery County.) Syringothyris occidentalis (Swallow) Page 103. Figs. 3-5. Posterior, anterior, and lateral views of a perfect interior mould of a small specimen. (Callaway limestone of Callaway County.) Spirifer subvaricosus H. & W. Page 101. Figs. 6 and 7. Front and side views of an imperfect pedicle valve. (Mineola of Ralls County.) Atrypa spinosa Hall. | Page 98. Fig. 8. Brachial valve of an average specimen. Figs. 9, 10, 11. Lateral, pedicle, and brachial views of an average specimen. (Snyder Creek shale of Callaway County.) Eunella linckleni (Hall) Page 93. Figs. 12, 14 and 16. Brachial, lateral, and pedicle views of an average specimen. Fig. 13. Lateral view of an average specimen. Fig. 15. Lateral view of a gibbous specimen. (Mineola of Montgomery County.) Cranaena romingert (Hall) Page 96. Figs. 17, 18, 19. Lateral, pedicle, and brachial views of an average specimen. (Mineola of Ralls County.) Cranaena towaensis (Calvin) Page 95. Figs. 20, 21, 22. Brachial, lateral, and pedicle views of a large specimen. (Callaway limestone of Callaway County.) eS a Missouri BurREAU OF GEOLOGY AND MINEs. Vou, XVII, 2np SERIES, PLATE 20, & vf % - 7 a Q ras “ ‘ CM j : 4 oe 4 + ‘ x ; 3 v : 4 q 7 . ‘ : ‘ ee . A ‘ i 7 “ “ 3 ® : ? : - ‘ mit ty _ ate a7 =| A F “ . .. a . s z * Je es & by - i rs x ; to 8? - R et “ - ~~? i \ - ’ : P . 2 é i” ia! i = PLATE NO: 21 PLATE 21 Syringothyris occidentalis (Swallow) Page 103. Figs. 1, 2, 3. Cardinal area, brachial, and pedicle views of well-preserved moulds of interiors. (Collection of D. K. Greger. Photos by D. K. Greger.) Spirtfer varicosus Hall Page 102. Figs. 4 and 5. Small pedicle valves. (X2). (Mineola of Ralls County.) Atrypa reticularis (Linneus) Page 97. Fig. 6. A specimen with well-preserved spines. (X2/3.) (Callaway limestone of Callaway County.) Fig. 7. Brachial view of a large old specimen. (X2/3.) (Snyder Creek shale of Callaway County.) Proetus crassimarginatus Hall and Clark Page 125. Fig. 8. Front of a fragmentary cephalon. (X2). Fig. A small pygidium (X2). Fig. 10. Front of a cephalon of average size. (Mineola of Montgomery County.) ‘S Dipterus mordax Eastman Page 128. Fig. 11. The only specimen known from the Callaway limestone. (X4). Ptyctodus ferox Eastman Page 127. Fig. 12. Top of the best specimen collected from the Missouri Devonian. (Snyder Creek shale of Callaway County.) Missourr Bureau or GEOLOGY AND Mines. Vox, XVII, 2np Serres, Puate 21, PLATE NO. 22 Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 5. Jed Fes Deh 2 Spirifer euryteines Owen Page 100. Pedicle valve of a large specimen. (Snyder Creek shale of Callaway County.) Cardinal view of a specimen with low area. (Snyder Creek shale of Callaway County.) Pedicle valve of a large silicified specimen. (Mineola limestone of Ralls County.) Cardinal view of the same specimen. Cardinal view of a small specimen. (Snyder Creek shale of Callaway County.) Figs. 6 and 7. Portions of silicified spires. (Mineola limestone of Ralls County.) Fig. 8. Fig. 9. Fig. 10. Fig. 11. Fig. 12. Side view of an exfoliated specimen. (Mineola limestone of Montgomery County.) Brachial valve. (Snyder Creek shale of Callaway County.) Surface enlarged to show ornamentation. (X4). (Snyder Creek shale of Callaway County.) Brachial valve of specimen figured in 1 and 2. Brachial valve of specimen figured in 3 and 4. Missouri BuREAU OF GEOLOGY AND MINES. Vou, XVII, 2np SERIES, PLATE 22. - pe ae eo . : oan 4,4 ~~ we SSL ee aR oe oA bag 2s PLATE NO. 23 PLATE. 23 Syringothyris occidentalis (Swallow) Page 103. Fig. 1. Mould of pedicle valve. (Collection of D. K. Greger. Photo by Greger.) (Callaway limestone of Callaway County.) Spirtifer euryteines Owen Page 100. Fig. 2. An unusually flat cardinal area. (Snyder Creek shale of Callaway County.) Fig. 3. An exfoliated pedicle valve. (Mineola of Montgomery County.) Spirifer asper Hall Page 100. Fig. 4. An enlargement to show details of the sinus. (Photo by Greger.) (Callaway limestone of Callaway County.) Pentamerella missouriensis Branson Pege 88. Fig. 5. The holotype. (X31). (Snyder Creek shale of Callaway County.) Gypidula mineolaensits Branson Page 99. Fig. 6. Pedicle valve of an imperfect specimen. Figs. 10 and 11. Side and pedicle views of an imperfect specimen. (Specimens from the Mineola of Ralls County.) Atrypa hystrix Hall Page 99. Fig. 7. A specimen from the Lime Creek of Iowa to compare with Atrypas from the Snyder Creek shale Atrypa spinosa Hall Page 98. Figs. 8 and 9. Pedicle views of average specimens. (Snyder Creek shale of Callaway County.) Atrypa reticularis (Linnaeus) Page 97. Fig. 12. A small smooth specimen, pedicle view. Fig. 13. A large rouzh specimen, pedicle view. (Snyder Creek shale of Callaway County.) a. Missourrt BuREAv OF GEOLOGY AND MINES. Vou, XVII, 2np Series, PLATE 23, PLATE NO. 24 PLATE 24 Pentamerella missouriensis Branson Page 88. Figs. 1-4. Brachial side, front and pedicle views of the holotype. (Snyder Creek shale of Callaway County.) Camarotoechia gregeri Branson Page 91. Figs. 5,6 and 8. Side, pedicle and brachial views of an average specimen. Figs. 7 and 9. Side and brachial views of a small specimen. (Snyder Creek shale of Callaway County.) Pentamerella fultonensis Branson Page 88. Figs. 10, 11, 12. Pedicle, side and brachial views of one of the cotypes. (Callaway limestone of Callaway County.) Spirtfer subvaricosus Hall and Whitfield Page 101. Fig. 13. Back view of a specimen with an unusually high cardinal area. (Mineola of Ralls County.) Spirifer varicosus Hall Page 102. Figs. 14 and 15. Side and pedicle views of a small specimen. (Mineola of Ralls County.) Camarotoechia depressa Kindle Page 90. Fig. 16. Brachial view of the only specimen collected. (Snyder Creek shale of Callaway County.) Spirifer annae Swallow Page 99. Fig. 17. Pedicle view of an average specimen. (Snyder Creek shale of Callaway County.) Schucheriella arctostriata (Hall) Page 83. Figs. 18, 19, 20. Brachial, pedicle and side views of an average specimen. Fig. 21. Cardinal area of an unusually well-preserved specimen. Figs. 22 and 23. Brachial and pedicle views of a flattened specimen. (Snyder Creek shale of Callaway County.) Missourt BurreAv OF GEOLOGY AND MINEs. Vou, XVII, 2nd SerRtes, PLATE 24, 14 PLATE NO. 25 PLATE 25 Goniophora hamiltonensis (Hall) Page 114. Figs. 1 and 2. Cardinal view and left valve of an imperfect specimen. (Snyder Creek shale of Callaway County.) Modiomorpha missouriensis Branson Page 114. Fig. 3. Left valve of an average specimen. Fig. 4. Cardinal view of the same specimen. - Fig. 5. Left valve of a specimen with strongly projecting umbones. Fig. 6. Cardinal view of a small specimen. Figs. 10 and 11. Side and cardinal views of an interior mould. (All specimens from the Snyder Creek shale of Callaway County.) Clinopistha rowleyi Branson Page 111. Figs. 7 and 8. Cardinal and side views of an average specimen. (Snyder Creek shale of Callaway County.) Paracyclas lirata (Conrad) Page 116. Fig. 9. Left valve of a large specimen resembling P. elliptica. Fig. 12. Right valve of an average specimen slightly broken in front. (Both specimens from the Snyder Creek shale of Callaway County.) Nucula cf. lirata (Conrad) Page 112. Figs. 13 and 14. Side and cardinal views. (Snyder Creek shale of Callaway County.) Grammysia ellaptica Hall Page 111. Fig. 15. A left valve slightly tilted from a cardinal view. (Snyder Creek shale of Callaway County.) Fig. 16. Another view of the same valve. Nucula snyderensis Branson Page 112. Fig. 17. Cardinal view of an average specimen. (Snyder Creek shale of Callaway County.) Fig. 18. Right valve of the same specimen. Missourr BurREAvU OF GroLoGgy AND MiIngEs. Vou, XVII, 2np Serins, PLATE 25. PLATE NO. 26 PLATE 26 Conocardium ohioense Meek Page 112. Figs. 1 and 2. Two views of a ventricose specimen. (X2.) Figs. 3 and 4. Two views of a specimen with the posterior end missing. (X2.) Figs. 5-7. A large ventricose specimen with both ends missing. (Mineola limestone of Ralls and Montgomery Counties. X2.) Platyceras cf. erectum Hall Page 122. Fig. 8. Side view of a small specimen. (X2.) (Mineola limestone of Montgomery County.) Platyceras carinatum Hall Page 121. Figs. 10-11. Two views of an average specimen. (Mineola limestone of Montgomery County.) Platyceras cf. calantica Hall Page 120. Figs. 9 and 17. Side and top views of an average specimen. (Mineola limestone of Montgomery County.) Platyceras annulatum Branson Page 122. Figs. 12 and 13. Side and top views of the holotype. (Mineola limestone of Montgomery County.) Euryzone lucina (Hall) Page 119. Fig. 14. Side view of a nearly perfect specimen so incrusted as to conceal a slit band if one is present. (Mineola limestone of Ralls County.) Platyceras conicum Hall Page 121. Figs. 15 and 16. Side and top views of an imperfect specimen. (Mineola limestone of Montgomery County.) Euryzone mineolaensis Branson Page 118. Fig. 18. A portion of a shell showing the slit band. (Mineola limestone of Ralls County.) Pleurotomaria providencis Broadhead Page 118. Fig. 19. Part of the shell showing ornamentation and slit band. Fig. 20. A composite drawing. The shells in the collection of the University of Mis- souri are all imperfect or covered with hard rock. Broadhead’s cotypes are in the collection. (Cooper limestone of Providence. Missouri.) Missourr BurBAU OF GECLCGY AND MINES, Vou, XVII, 2nD SERIES, PLATE 26, ed —. - sat Re eligaeey Sind = a * <« ‘ ‘ey . ay + ~s : 9 A PLATE 27 Diaphorostoma snyderensis Branson Page 123. Figs. 1, 8,9. Three views of average specimens. (Snyder Creek shale of Callaway County.) Belerophon sp:. Page 117. Figs. 2, 3. Front and side views of the only specimen collected. (Snyder Creek shale of Callaway County.) Schizodus chemungensis (Conrad) Page 113. Figs. 4, 5, 6, 7. Left, right, and top views of average specimens. (Snyder Creek shale of Callaway County.) Missovri BuREAU OF GEOLOGY AND MINES. Vou, XVII, 2np SERIES, PLATE 27, PLATE NO. 28 Fig. Fig. Fig. ' Fig. Fig. Fig. Fig. Fig. PLATE 28 Pleurotomaria isaachtt H. and W. Page 117. Side view of a large specimen. (Snyder Creek shale of Callaway County.) Side view of an average specimen with low spire (Snyder Creek shale of Cal- laway County.) ? Top view of a slightly deformed specimen. (Snyder Creek shale of Callaway County.) Pleurotomaria sp. undet. Page 117. An imperfect mould. (Mineola limestone of Ralls County.) Platyceras cf. erectum Hall Page 122. Side view of a large specimen. (Mineola limestone of Montgomery County.) Platyceras nodosum Conrad Page 122. Side view of an imperfect specimen. (Mineola limestone of Montgomery County.) Another view of the same specimen. Euomphalus cf. hecale Hall Page 120. Side view of an average specimen. (Snyder Creek shale of Callaway County.) Top view of the same specimen. Euryzone mineolaensis Branson Page 118. An imperfect specimen. (Mineola limestone of Ralls County.) A nearly complete specimen. (Mineola limestone of Ralls County.) Missourt BuREAU OF GEOLOGY AND MiNEs. Vou, XVII, 2Np SERIES, PLATE 28. PLATE NO. 29 PLATE 29 Orthoceras sp. tndet. Page 123. Fig. 1. End of septum showing siphuncle. Fig. 2. Side view of four segments. (Snyder Creek shale of Callaway County.) Figs. 3, 5, 6. Fragments of two undeterminable species. (Snyder Creek shale of Callaway County.) Cyrtoceras sp. undet. Page 124. Fig. 4. An imperfect and much-weathered specimen. (X2). (Snyder Creek shale of Callaway County.) Gomphoceras sp. undet. Page 125. Fig. 7. The only specimen collected from the Mineola. (X 4/5). (Ralls County.) Missouri BuREAU OF GEOLOGY AND MINES. Vou, XVII, 2nNp SErRtEs, Puare 29, Lis ” 2 see 2 PLATE NO. 30 PLATE, 30 Spiroraphe arata (Hall) Page 119. Figs. 1 and 2. Top and side views of an average specimen. (Callaway limestone of Callaway County.) Orthoceras cf. atreus Hall Page 124. Fig. 3. An imperfect specimen about 2/5 natural size. (Snyder Creek shale of Callaway County.) Orthoceras sp. undet. Page 123. Fig. 4. Fragment of unidentified specimen. Five more chambers were collected. (X2/5). (Snyder Creek shale of Callaway County.) Fig. 5. Part of living chamber and four segments of another species. (X 2/5). (Snyder Creek shale of Callaway County.) Proetus crassimarginatus Hall and Clarke Page 125. Figs. 6 and 7. Pygidia from the Mineola limestone of Montgomery County. Fig. 8. Pygidium from the Snyder Creek shale of Callaway County. Bellerophon sp. undet. Page 117. Fig. 9. Small specimen from the Mineola limestone of Montgomery County. Missouri BuREAU OF GEOLOGY AND MINES, Vou. XVII, 2Np SERIES, PLATE 30. PLATE NO. 31 PLATE st Ptyctodus calceolus (Newberry and Worthen) Page 126. Figs. 1 and 2. Top and side views of a large specimen. (X 8/7). (Mineola limestone of Ralls County.) Glyptas pis Page 128. Fig. 3. Glyptaspis plate (X 1/2). (Snyder Creek shale of Callaway County.) Dinichthyids Page 129. Figs. 4 and 5. Outer view of a postero-supero-gnathal of a dinichthyid. (Mineola of Ralls County.) ‘ Fig. 6. Fragment of a dinichthyid bone. (Mineola of Ralla County.) Dinichthys pustulosus Eastman Page 127. Fig. 7. Median occipital, showing pustules. Fig. 8. Rostral. The reference to D. pustulosus is uncertain. (Mineola limestone of Ralls County.) Missouri BUREAU OF GEOLOGY AND MINES, Vou, XVII, 2np SeRizEs, PLATE 31. Feats 3 ee: Met ated ; =i fama 2 PLATE NO. 32 PEATE: 32 Chonetes coronatus (Conrad) Page 138. Fig. 1. Brachial valve of an ordinary specimen. Figs. 2 and 3. Pedicle valves of large specimens. (St. Laurent limestone) (W. M.* 23996 and 23976). Chonetes vicinus (Castelnau) Page 149. Fig. 4. An imperfect interior mould of the pedicle valve. Fig. 5. An average brachial valve. (Beauvais sandstone) (W. M. 23995). Schuchertella chemungensis pectinacea (Hall) Page 137. Fig. 6. Internal mould of a brachial valve. Fig. 7. Exterior of a brachial valve. (Grand Tower limestone) (W. M. 23879). Chonetes scitulus Hall Page 139. Figs. 8 and 9. Pedicle and brachial views. (After Hall.) Stropheodonta patersoni Hall Page 135. Fig. 10. A small area near an umbone to show peculiar ornamentation. (X2). (Grand Tower limestone) (University of Missouri collection). Fig. 11. A pedicle valve. (After Hall.) Stropheodonta concava Hall Page 134. Fig. 12. A pedicle valve. (After Hall.) *W. M. indicates Walker Museum. Missouri BurREAv OF GEOLOGY AND MINES. Vou. XVII, 2NvD SERIES, PLATE 32, 15 PLATE NO. 33 PLATE 33 Spirtfer granulosus (Conrad) Page 146. Figs. 1, 2, 10. Brachial, pedicle, and side views. (After Hall.) Spirifer audaculus (Conrad) Page 145. Figs. 3 and 4. Brachial valves. Fig. 5. An imperfect pedicle. valve. (St. Laurent limestone) (W. M. 23987). Spirifer griert Hall Page 147. Figs. 6-8. Brachial and front views. (After Hall.) Spirifer pennatus (Atwater) Page 147.° Fig. 9. An imperfect pedicle valve. (St. Laurent formation) (W. M. 23979). Tropidoleptus carinatus (Conrad) Page 137. Figs. 11 and 12. Pedicle and brachial views. (After Hall.) Missourt BuREAU OF GEOLOGY AND MINES. Vou, XVII, 2Np Series, PLATE 33. PLATE NO. 34 PLATE 34 Camarotoechia prolifica (Hall) Page 143. Figs. 1 and 2. Pedicle and front views. (After Hall.) Camarotoechia wellert Branson and Williams: Page 144. Figs. 3, 4, 5, 6. Brachial, pedicle, side, and front views of the holotype. (Grand Tower limestone) (W. M. 23885). Camarotoechia congregata (Conrad) Page 142. Figs. 7,9. 10. Front, pedicle, and brachial views. (The specimen is probably from the Grand Tower. It was sent to the University of Missouri by a resident of the district.) (University of Missouri collection.) Figs. 8, 11. Front and brachial views. (After Hall.) Fig. 12. Interior mould of brachial valve. (St. Laurent formation) (W. M. 23963). Aitrypa spinosa Hall Page 145. Figs. 13 and 14. Pedicle and brachial views. (Grand Tower limestone) (W. M. 23871). Camarotoechia sappho Hall Page 143. Figs. 15, 16,17. Brachial, front, and pedicle views. (Probably from the Grand Tower limestone. The specimen was sent in with the specimen of C. congregata (Conrad) and specimens of Nucleocrinus verneutlt (Troost).) (University of Missouri collection.) Missouri BurEAvU OF GEOLOGY AND MINES. Vou, XVII, 2Nv SERIES, PLATE 34, o o® : Vices) en Mga a * ee PLATE NO. 35 PLATE 35 Strophalosta truncata (Hall) Page 141. Figs. 1 and 2. Exteriors of pedicle valves. (After Hall.) Fig. 3. Exterior of a brachial valve. Fig. 4. Exterior of a pedicle valve. (St. Laurent limestone.) (W. M. 23977.) Craniella cf. hamiltoniae (Hall.) Page 133. Fig. 5. An imperfect valve. : (Grand Tower limestone.) (W. M. 23881.) Cyrtina alpenensis Hall and Clarke Page 148. Fig. 6. Aside view. (After Hall and Clarke.) Fig. Side view of a pedicle valve. Fig. 8. Front view of a pedicle valve. (St. Laurent limestone.) (W. M. 23961.) ~ Pholidops cf. oblata Hall Page 133. Fig. 9. An impression of a brachial valve. (St. Laurent limestone.) (W. M. 23969.) Productella spinulicosta Hall Page 141. Figs. 10 and 12. Two views of pedicle valves. (After Hall.) Fig. 11. A pedicle valve. (Grand Tower limestone.) (W. M. 23882.) Chonetes mucronatus (Hall) Page 141. Fig. 13. A pedicle valve. (After Hall.) Fig. 14. A pedicle valve from the St. Laurent formation. (W. M. 23875.) Leptostrophia perplana (Conrad) Page 135. Fig. 15. A pedicle valve. (After Hall.) Fig. 16. An imperfect brachial valve. (St. Laurent formation.) (W. M. 23965.) Platyceras carinatum Hall Page 156. Figs. 17 and 18. Two views of the best specimens in the collections. (Grand Tower limestone.) (W. M. 23891.) MissouriI BUREAU OF GEOLOGY AND MINEs., Vou, XVII, 2Nv SErRizEs, Puare 35. 5 gh 6 2 8 Z ® @ 2 4 -PLATE NO. 36 \ Fig. Fig. Fig. Fig. Fig. ice Fig. Fig. Fig. = PLATE 36 Paracyclas elliptica Vall Page 115. An avérage specimen. (Grand Tower limestone.) Pterinea flabellum (Conrad) Page 149. Left valve of a well-preserved specimen. (After Hall.) Limoptera macroptera ? (Conrad) Page 154. A left valve. (After Hall.) An imperfect left valve. (X14). (St. Laurent limestone.) (W. M. 23846.) Leptodesma rogerst Hall Page 151. A nearly perfect left valve. (X 5/2). Restoration of the end of the alation slightly incorrect. (St. Laurent limestone.) (W. M. 23971.) Actinopteria cf. boydit (Conrad) Page 152. A left valve. (After Hall.) Glyptodesma cf. erectum (Conrad) Page 150. An imperfect left valve with hinge line somewhat uncertain. (St. Laurent limestone.) (W. M. 23981.) Letopterta dekayt Hall Page 153. An imperfect left valve. Umbonal part uncertain. (Grand Tower limestone.) (W. M. 23889.) A left valve. (After Hall.) Missourrt BurBAv oF GEOLOGY AND MINES. Vou, XVII, 2np Series, PuatE 36. PLATE, NO; 37 PLATE: 37 Gomphoceras cf. impar Hall Page 159. Fig. 1. The best preserved specimen. (X 3/5). (Grand Tower limestone.) (W. M. 23895.) Gomphoceras missouriensis Branson and Williams Page 160. Figs. 2 and 3. Side views of two living chambers. Fig. 4. Dorsal view of a living chamber. Fig. 5. Outline of aperture. (Grand Tower limestone.) (W. M. 23900.) Gomphoceras grandtowerensis Branson and Williams Page 15s. Figs. 6 and 7. Two views of the holotype. (X14). (Grand Tower limestone.) (W. M. 23897.) Nephriticeras sp. undet. Page 158. Fig. 8. Side view of a fragment. (Grand Tower limestone.) (W. M. 23902.) Fig. 9. Unidentified specimen. (Grand Tower limestone.) (W. M. 23903.) Orthoceras cf. subulatum Hall Page 157. Fig. 10. The largest specimen collected. The air chambers are better preserved in other specimens. (Grand Tower limestone.) (W. M. 23898.) ee Missourt BuREAU OF GEOLOGY AND MINEs, Vou, XVII, 2ND SERIES, PLATE 37, oe Se ». SS tl a PLATE NO. 38 Fig. 1. Bicee2; Fiveros Fig. 4. PLATE 38 Gomphoceras hyaiti Whitfield Page 158. Side view of a large specimen. (X1%). . (Grand Tower limestone.) (W. M. 23896.) Gomphoceras missouriensis Branson and Williams Page 160. Side view of the largest specimen collected. (Grand Tower limestone.) (W. M. 23900.) Gomphoceras plenum Hall? Page 169. Side view of the living chamber of the only specimen collected. (X14). (Grand Tower limestone.) (W. M. 23984.) Nephriticeras n. sp. Page 158. The only specimen in the collections. (X14). (Grand Tower limestone.) (W. M. 1878.) a PLATE 38, Vou, XVII, 2np SERIES, Missouri BuREAU OF GEOLOGY AND MINES. PLATE NO. 39 PLATE 39 Phacops cristata Hall Page 163. Fig. 1. An imperfect cephalon. (Grand Tower formation.) (W. M. 23909.) Fig. 2. Pygidium and some pleural segments. (After Hall.) Onychodus sigmoides Newberry Page 164. Fig. 3. A fragmentary specimen, slightly retouched. (Grand Tower limestone.) (W. M. 23912.) Proetus crassimarginatus Hall and Clarke Page 161. Fig. 4. An ordinary pygidium. (Grand Tower limestone.) (W. M. 23905.) Phacops rana (Green) Page 163. Fig. 5. Figure after Hall. Tentaculites sp. undet. Page 157. Fig. 6. Acast of animpression. (X6.) (Beauvais sandstone.) (W. M. 23992.) Diaphorostoma genevievensis Branson and Williams. Page 156. Figs. 7 and 8. Side and top views of one of the cotypes. Fig. 9. |The same specimen as in fig. 8. (X5). (Grand Tower limestone.) (W. M. 23893.) Cryphaeus bootht Green Page 162. Fig. 10. The best pygidium in the collections. (St. Laurent limestone.) (W. M. 23967.) Platyceras nodosum Conrad Page 156. Fig. 11. The only specimen in the collections. (Grand Tower limestone.) (University of Missouri collection.) Proetus haldemani Hall Page 161. Fig. 12. One of the most complete cephala in the collections. (Grand Tower limestone.) (W. M. 23908.) _— Missourrt BurREAU OF GEOLOGY AND MINES. Vou, XVII, 2ND SERIES, PLATE 39. tance eS Pps. Ss Ped etic save Ley Pee ‘eae + *) PLATE NO. 40 PLATE 40 Hindia fibrosa (Roemer) Page 176. Fig. 1. An incomplete sponge. Figs. 2, 3. Complete individuals. Fig. 4. A specimen that shows the radial canals and spicules. (X2). Streptelasma strictum Hall Page 177. Figs. 5-8. Side views of incomplete coralla. Fig. 9. Top view. Fig. 10. Side view. Fig. 11. Top view. Favosites helderbergie Hall Page 177. Fig. 12. Top view of a portion of a corallum. Figs. 13-16. Side views of specimens. Fig. 17. Top view of a fragment of a corallum. Missourt BurnAuU OF GEOLOGY AND MINEs. Vou, XVII, 2Np Serres, PLats 40. 16 PLATE NO. 41 PLATE 41 Favosites helderber gic Hall Page 177. Fig. 1. Side view of a portion of a corallum. Favosites conicus Hall Page 178. Fig. 2. Basal view of an incomplete individual. Figs. 3, 4. Side and basal views of a portion of a corallum. Fig. 5. Side view of an incomplete corallum. Fig. 6. Basal view of a specimen. Fig. 7. Side view of a specimen. Missourr Bureau or Grouocy AND MINES. Vou, XVII, 2np SErtus, Puare 41, PLATE NO. 42 PLATE 42. Striatopora missouriensis Meek and Worthen? Page 179. Figs. 1-3. Portions of coralla. Fig. 4. Portion (fig. 1). (X2). Striatopora bella Swartz Page 179. Figs. 5,6. Parts of coralla. (X2). Figs. 7, 8. Portions of coralla. Pleurodictyum lenticulare (Hall)? Page 180. Fig. 9. Top view of a portion of the corallum. (X2). Scyphocrinus sp. Page 180. Fig. 10. Top view of an incomplete root-bulb. Missouri BUREAU OF GEOLOGY AND MINEs, Vou. XVII, 2Np SERIES, PLATE 42. PLATE NO. 43 PLATE 43 Scyphocrinus sp. Page 180. Fig. 1. Side view of an incomplete root-bulb that retains part of the collar. Fig. 2. Top view of an incomplete root-bulb. Figs. 3, 4. A portion of the unweathered surface of a root-bulb to show the polygonal character of the plates, and a portion of the weathered surface of the same bulb to show the stellate character. Fig. 5. Side view of an incomplete calyx. Fig. 6. Basal view of a portion of a calyx. Missourt BuREAU OF GEOLOGY AND MINES. Vou, XVII, 2Np SERIES, PLATE 43, ~ PLATE NO. 44 PLATE 44 Edriocrinus ? sp. Page 181. Figs. 1-3. Side, top and basal views of the portion of a calyx. Alsopocrinus anna n. sp. Page 181. Figs. 4-6. Side views and basal view of the incomplete dorsal cup. Fistulipora ? sp. Page 181. Fig. 7. Portion of a zoarium. (X2). Fenestella ? sp. Page 182. Fig. 8. The fragment shows the non-celluliferous face of a zoarium. (X2). Crania alsopi n. sp. Page 182. Mertstella princeps Hall, Page 203. Figs. 9-11. Dorsal and side views of the uncrushed specimen, and dorsal view of the crushed specimen attached to the representative of Meristella princeps. Dalmanella planoconvexa (Hall) Page 182. Figs. 12,13. Ventral and posterior views. Figs. 14-16. Ventral, dorsal, and posterior views. Fig. 17. An incomplete dorsal valve. Dalmanella perelegans (Hall) Page 183. Fig. 18. Dorsal view. Fig. 19. Interior of a fragment of a dorsal valve. Figs. 20-24. Ventral, dorsal, posterior, anterior and side views. Figs. 25, 26. Ventral and dorsal views. Dalmanella quadrans (Hall) Page 183. Fig. 27. An incomplete dorsal valve. Fig. 29. An incomplete dorsal valve. Fig. 28. An incomplete ventral valve. Figs. 30, 31. Dorsal and ventral views. Rhipidomella oblata (Hall) Page 184. Figs. 32, 33. Side and posterior views. es Vou. XVII, 2Np SERIES, PLATE 44, Missourt BurgEAU OF GEOLOGY AND MINES. aoe 7s a ° PLATE NO. 45 PLATE 45 Rhipidomella oblata (Hall) Page 184. Figs. 1, 2. Dorsal and ventral views. Figs. 3,4. Dorsal and ventral views. Fig. 5. An incomplete ventral valve. Fig. 6. A ventral valve. Figs. 7,8. Incomplete dorsal valves. Rhipidomella discus (Hall) Page 184. Figs. 9-12. Dorsal, ventral, side and posterior views. Fig. 13. Dorsal view. Fig. 14. An incomplete dorsal valve. Figs. 15, 16. Ventral and dorsal views. Rhipidomella ellsworthi n. sp. Page 185. Figs. 17-31. Ventral, dorsal, side, anterior and posterior views of three shells. Figs. 32, 33. Ventral and anterior views. Fig. 34. Dorsal view. Fig. 35. Ventral view. Fig. 36. Ventral view. Fig. 37. Ventral view. Fig. 38. An incomplete ventral valve. Fig. 39. An incomplete dorsal valve. Missouri BurEAU OF GEOLOGY AND MINEs. Vou. XVII, ZND Series, Puate 45, PLATE NO. 46 PLATE 46 Rhipidomella melvillei n. sp. Page 185. Figs. 1-10. Ventral, dorsal, posterior, anterior, and side views of two specimens. Figs. 11-13. Ventral, dorsal, and anterior views. Figs. 14, 15. Ventral and dorsal views. Fig. 16. Ventral view. ; Fig. 17. An incomplete ventral valve. Bilobites varica (Conrad) Page 185. Figs. 18-20. Ventral, dorsal, and anterior views. Figs. 21-23. Ventral, dorsal, and posterior views. Fig. 24. Ventral view. Fig. 25. Dorsal view. Leptaena rhomboidalis (Wilckens) Page 186. Fig. 26. A partially exfoliated, incomplete ventral valve. Fig. 27. Interior of an incomplete dorsal valve. Fig. 28. A partially exfoliated, incomplete ventral valve. Fig. 29. Internal cast of an incomplete ventral valve. Fig. 30. External cast of a part of a dorsal valve. Fig. 31. Dorsal view. Fig. 32. Ventral view. Stropheodonta arata (Hall) Page 187. Fig. 33. A'most complete external cast of an incomplete dorsal valve. Figs. 34, 35. Ventral and side views of a partially exfoliated, incomplete ventral valve. Stropheodonta (Leptostrophia) planulata (Hall) - Page 187. Fig. 36. An incomplete ventral valve. Fig. 37. Interior of a portion of a ventral valve. Fig. 38. ae | 2 ee PLATE NO. A9 PLATE 49 Eatonia singularis (Vanuxem) Page 192. Figs. 1, 2. Ventral and anterior views of the single specimen. Uncinulus nucleolatus (Hall) Page 193.- Figs, 3, 4. Anterior and dorsal views. Fig. 5. | Dorsal view of a specimen with 5 plications on the fold. Figs. 6-11. Side and anterior views of three specimens. Figs. 12-14. Anterior, dorsal, and side views. Fig. 15. Posterior view. Fig. 16. Posterior view of a portion of a shell. Uncinulus mutabilis (Hall) Page 193. Figs. 17-19. Dorsal, side, and anterior views. Fig. 20. An incomplete ventral valve. Fig. 21. Side view. Fig. 22. Dorsal view. Uncinulus subpyramidatus n. sp. Page 194. Figs. 23-30. Dorsal, anterior, side, and ventral views of two incomplete shells. Figs. 31, 32. Dorsal and anterior views. Fig. 33. Anterior view. Fig. 34. Dorsal view. Wilsonia wadet Dunbar Page 195. Figs. 35-46. Ventral, dorsal, side, and anterior views of three specimens. Figs. 47-48. Interior of incomplete ventral valves. Missovurt BurEAv OF GEOLOGY AND MINEs. Vou, XVII, 2NpD Series, PLarT 49, PLATE, NO: 50 _ PLATE 50 Wilsonia wadet Dunbar Page 195. Figs. 1, 2. Ventral and side views. Figs. 3,4. Dorsal and anterior views. Rhynchonella transversa Hall Page 195. Figs. 5-12. Dorsal, side, ventral, and anterior views of two specimens. Figs. 13-15. Dorsal, side, and ventral views. Fig. 16. Dorsal view. Fig. 17. Side view. Fig. 18. Posterior view. Fig. 19. Ventral view. Fig. 20. Side view. Rhynchonella (?) bialveata Hall Page 195. Figs. 21-23. Ventral, dorsal, and side views of one specimen. Fig. 24. Dorsal view of the other observed specimen. Rensselaerina medioplicata Dunbar Page 196. Figs. 25, 26. Dorsal and anterior views of the one specimen. Atrypina imbricata (Hall) Page 197. Figs. 27-29. Side, ventral, and dorsal views of the single specimen. Atrypa reticularis (Linne) Page 198. Fig. 30. An incomplete, elongate ventral valve. Fig. 31. Internal cast of a ventral valve. Fig. 32. Posterior view. Figs. 33, 34. Ventral and anterior views. Fig. 35. Side view of an incomplete shell with numerous growth lines. Fig. 36. Anterior view of a specimen that shows the remains of fringes. Fig. 37. A dorsal valve that shows the remains of fringes. Fig. 38. An incomplete ventral valve that retains the remnants of fringes. Fig. 39. Anterior view of a specimen with a prominent dorsal fold. Fig. 40. Anterior view of a variety. Delthyris perlamellosus (Hall) Page 199. Fig. 41. Ventral view. Figs. 42, 43. Dorsal and side views. Figs. 44-49. Dorsal, side, and anterior views of two specimens. — Missourrt BurREAU OF GEOLOGY AND MINEs, Vou. XVII, 2Np SERiEs, PLATE 50. PLATE NO. 51 Pit Boose Delthyris missouriensis n. sp. Page 199. Figs, 1-6. Posterior, side, and ventral views of two specimens. Figs. 7, 8. Posterior and side views. : Fig. 9. A portion of a ventral valve. Fig. 10. Interior of a fragment of a ventral valve. Fig. 11. Dorsal view. Spirifer cyclopterus Hall Page 200. Figs. 12, 13. Ventral and dorsal views. Figs. 14-16. Dorsal, ventral, and posterior views. Figs. 17-19. Dorsal, ventral, and anterior views. Figs. 20, 21. Incomplete dorsal valves. Figs. 22, 23. Interior of fragments of ventral valves. Fig. 24. Side view. Fig. 25. Ventral view. Fig. 26. Dorsal view of an incomplete shell on which the medial depression of the fold is well-marked, and which has a bifurcated plication. Fig. 27. A portion of a ventral valve. Delthyris octocostatus (Hall) ? Page 199. Figs. 28, 29. Ventral and dorsal views of the single specimen. Cyrtina dalmani (Hall) Page 201. Fig. 30. Posterior view. Fig. 31. Dorsal view. Missouri BurEAv OF GEOLOGY AND MINEs. Vou. XVII, 2npD SeRiEs, Puate 51, PLATE (NO! 52 PLATE 52 Cyrtina dalmani (Hall) Page 201. Figs. 1, 3. Ventral, dorsal, and posterior views. Fig. 4. Central view of a portion of a shell. Rhynchospira formosa Hall- Page 201. Figs. 5-7. Ventral, dorsal, and side views. Figs. 8-11. | Ventral and dorsal views of two specimens. Figs. 12-14. Ventral, dorsal, and side views. Fig. 15. Side view. Fig. 16. Anterior view of a perfect individual. Fig. 17. Ventral view of a variety. Fig. 18. Dorsal view. Trematospira equistriata Hall and Clarke Page 201. Figs. 19, 20. Ventral and posterior views of the one specimen. Nucleospira ventricosa Hall Page 202. Fig. 21. Ventral view. Fig. 22. Ventral view. Figs. 23, 24. Ventral and anterior views. Figs. 25, 26. Dorsal and anterior views. Figs. 27-30. Anterior, dorsal, ventral, and side views. Figs. 31-33. Dorsal, ventral, and posterior views. Meristella laevis (Vanuxem) Page 202. Figs. 34-36. Ventral, dorsal, and side views. Figs. 37-44. Ventral, dorsal, side, and anterior views of two specimens, Missovurt BuREAU OF GEOLOGY AND MINEs. Vou, XVII, 2np SERIES, PLATE 52. oe Ppa: ml ix Ae ae Se PLATE NO. 53 PLATE 33 Meristella laevis (Vanuxem) Page 202. Figs. 1, 2. Dorsal and side views. Meristella bella Hall Page 203. Figs. 3-6. Ventral, dorsal, side, and anterior views of the single specimen. Meristella atoka Girty Page 204. Figs. 7-10. Dorsal and side views of two specimens. Figs. 11, 12. Dorsal and anterior views. Figs. 13-15. Side, dorsal, and anterior views of a partially restored shell. Fig. 16. Dorsal view of an almost completely exfoliated individual. Fig. 17. An incomplete ventral valve. Fig. 18. Internal cast of a ventral valve. Fig. 19. A partially exfoliated ventral valve. Fig. 20. Anterior view of an almost wholly exfoliated individual. Rensselaerina medioplicata var. latior Dunbar (?) Page 197. Figs. 21, 22. Dorsal and side views of a portion of a shell. Fig. 23. A portion of a ventral valve. Fig. 24. Side view; the marked projection of the ventral above the dorsal beak is due to distortion. : —_— Missourrt BurEAU OF GEOLOGY AND MINEs, Vou, XVII, 2np Series, PLATE 53. “ >. , > ys eh od ‘ a ears « \ é , ms ‘ é an ag > . ~_" 5 “ \ P ~ * e : é . he ‘ +. . ~ ‘ ‘ - . ‘ Ne 7 : . y ¢ ‘te , i ' y v i? . re, e “ P . 4 . ) < : - i * al - a ‘ % - ¢ a . ‘ - - A . . ’ “ . PLATE NO. 54 PLATE 54. Rensselaerina medioplicata var. latior Dunbar (?) Page 197, Fig. 1. | Ventral view of a portion of a shell. Fig. 2. A portion of a ventral valve. Fig. 3. Interior of a fragment of a dorsal valve. Fig. 4. Interior of a part of a ventral valve. Pteronttella (?) sp. Page 205. Fig. 5. Internal cast of a portion of a left valve—the only specimen observed. Conocardium sp. Page 205. Fig. 6. |The one specimen—an internal cast of a part of a left valve. Aviculopecten (?) umbonata (Hall) (?) Page 205. Fig. 7. An incomplete left valve that retains portions of the shell. Fig. 8. cara penta wee Ris oe be tree ee eR ew Dine Soa el. Gr Bata bSUS SEAT Lede Pees Meare eh py tae. ce ee helene, RUE Se at aii gk, &. ab tats th eae heh 167, 205, Pl. 54 B UP Ui Pety UE SVIE ESTAS Ses 2 em St UR NET eh Sa a rea a eee 1 PAE ECE A os 2 EE ROG 2S, Sea RENN, SOR EE RED Dee Ge By na c — aaa ce 166, 167 LE GAMES FEMS EMS TST VE °c ROR Ure ao Pa los ee a a VD 166 PES PEIN ee S'S Sra OPEL Tote hs Seg a Ye 5 Rp Nes PRN BPR ETTORE TAREE kak. Gad 166 LOVE HLS), SIE Tot )9 CIS Qe pA Dip engene aReece e a ae Se ea 166, 167, 169 Ree AUG Me OMMET ENE: 7 cela parc Re aes wisi ane ie vise AR ale ace alk War -« «L66, 16%, 1685 171 CEE Deh, VV Eya ot Leis ol] 0 een ee SP ie ee ego ee ea eC eRe oe ae tA 166, 169 BE SaAREIA EA CMENATDIO Rick MME ROY OO2 (oy ms a es 10k BERG cease al av eerie (6b osckd anny ce ec decay pe Tie doe 244 SEED EE SIR Rl ee Re ere ee EIS Tear eee 216, 244, Pl. 65 SUSI A= 3 "Ree RMSE Se ee A eae re RMSE e Cte eBe APR RE oP ye Bea acice in geting fin Siete eas 216, 244, Pl. 64 Pana RENATO cre Recess erie ebay Gk ae aber d: 2 ee one ae Bas kina? ten ah ERR ls oe Rh 131 Bellerophon LITERS Lae Se PE ee Sle Re a AE A Sg Are > ODED hale ee Aah MER Sr = RSENS Rp ers 278 TOELNE U2 Ss oy Sie a ts Cae one ee ea ge ois arent Fie PUN SLA ae Senne e Se Reae ae aur gy 117, 278 EL ee a NR CP Pete a uae les Sela cie as icf cic, ead ean ueeeweersi vhs 1b 9) a gel eb eivley shes 42° 117 155, Pl, 27, 30 ERSTE ere Eh ny EERE eA Deck Sars Siar ta ee eam, Se cae ae ees Sab ao Oe 269 20 lI ; INDEX Page BLOW TERS: WATUCA Ec oct oyster de ate a aha pee ea URL Eaten mo aME UGE che ahs ree A cP are ens 167, 185, Pl. 46 Ir GSGne SHAG iG. csierons oko ge ss oc Soaaes actos av apa oaDe waiarouann oer cea ee: enor e eae ee (erisd Pace moepe, ahaea eres 175 Black SUG Nace ging S18) niinraso spews fo koe witai ax ota aeviagre leven pana gel rete Raley aie el aie ticles keys ea ee 8 Blastoid Gas 2 Wa5. Ss oe coye tec sede esse tee SRD cM ER tee eerie aie ace ees cole ee oe eee oo 57, 132 Bois:G’ APG VMESTOMO. 5.60% ve rene GO ato ae celal ate ATA co aed, ane any ate Er nr ee ae ee a 175 Boone: County, Cooper: Limestone» .-« s:ctuieiss compa ehateas ee) orplee acer eieieaes speteties Sie Saepere gaaniees 13 DIS VOWLAIN ws; chs, cnet aywin. BLS dew FP eTE Sra hy Rv Nema ne ate ee aire ove SORE, Onno TRE CENSOR ee 3 PBROGIY. OCLITIUS ao hs iced ho be Shite gos lone wietins alee Mbe-dte ele, Sis ey eane) © Beam a ak ae OS gee ear a Sane 65 Brachiopoda........... Fp ihn r SAG Voges eee s bye Ab Bil cides es faeaieg a tenar tae ane ena aa 71, 182, 182, 228 HE Seee ned atyyg] O} os Coy a Mec Cy ims 0 17) LD {TSR gi ee ame ORE pe ae oe ee od ee ye rea ae kiran 216, 235, Pl. 62 BD arid 2a aia aes coaches erence Aue tetap aie LNie ca ME Ne, ehisk oike cay GME alec cava ce ana ee 216, 236, Pl. 62 Bridgerd:cwoOted, OD DO VO MTA ES cose sao of cee euee aca coke ua pian hl arama s elcte ieee tr sel amsta ote amas 276 Broadheads "Gs, Ceverred! COs 7c cocks a ase a aus vere a poheelalauniza, eraret Hale eben kateanl he eee eee 15 quoted on Callaway WmestOmne yes rics oe ois bole acd case cee cote ae wales he allt lel ap hae aoe ed a ees 25 SEViOZ. Seutehe ce aie sieeve oe ratehe oes PEAR yO om SPR Sic Ae aur et 14, 68, 132, 181, 223 Burlington, relation: of, to Callaway limestone... 0... 6 ee cw cae ue eb awe ah delle 6 33 Mineola limestone......... I TOOL ROI cuore tor ea Gans c Mipncy roa e ke 17 Snyder Oreck shale: Foie tia tae oka ite ecaaw eae eo ne Ceye Ole cieahole ris Bo JNaR cea ae Cae ene ae 40 SVLAMOLE NANGSDOME 5 oars, we a oe cere, Sra oe oes cet eae pene eh ale de a teieaeie Lansicie: ncn eee 8 Cc Callaway ‘Cox, Devonian wy 50 eee Sitar a aha, Wace Ge eee. o etsiurailt peo rae eke ee aap etna tenes 3h FeOLOLIEal COMM Ho 675 «odes a eke cha eet eae, Neen ae ete oie tone avaneaetarane Eg Cece heath 46 PATH POM TOCEKS 4. hoa ade Sie Decl der law eak secon ete tens ra Teldeh ate hak ar her eae tos ree Mitel coe aan 24 Mineola imestonest, 222 Sabie ore ie cueuscelm CS aca a bal aaare el ele Mamhnclos ote eee eet 17, 18, 19 SmyderiCreek Snales seis oasis cicen ote cree eee eee CRAM ack “sb obeoavia tags, Ae cette one iane ek ha ae, 37 .Callaway limestone, Bobs Creek...... Mo fone RSE SS Tek OI A os ee Eee 32 BOONE COUMty ye hos StS Sn ate Sia Soe mons tis sha AOS tid week aR to ratineaz a: eoeine ey dena eee gen ean ne Re me 27 COPE Zeta fel O10 ES en Moen ee Wen ect arp tee aia” eee cratic Ss Pier tA See RR RS A Ra UY SO eB, 26, 27 COLES OM ay assy ere eae elas ae cae Oe ee, etera se” dae tahatle oe, duet mane Sue ak So shag: Doe receNeR ee ea 27 COLLATION Fock Mee ee ee ee Pn eras eas faa GeeteS, ae a westd Weete ne St dhe eae it es etek aeek eee 35 WOW Greek he es TEE Whee a ae ae gl Steer at oa aeae tro diol) ota RE Sener eee a tes ae neg a 29 GESCHIP THOM: | ACG SERS Os tok eee elle ee ae Leen oreo e wilt eat AORN RE ee EI or ee Ree 26 ORPOSUILOS oi Act eee ors URE 's fade fe. 'e oita Stat ate eae peeh claus rioue bey ode) a eee ete ane ten ae neta Mae eee 4 WeiMeol WO: is KE ree Sia ess ao ee eee er oe Se one ae one ee Tee ce ee 31 MonITCHUNOO Ne See eee oo Oe RR ko aed eee a 26 IVEORESOMELY COse cb ss Fs: scolar ole Bw ences aes ftot cate ope si. One ee hee ee ages sane eek eee) WALOOUITOLOR Y. SLPS Gls ae SGM hehe tes oe act tes Be fe, fa ta etree are eee aM, mee caw eee epee ie tate ee 34 Lee coe! Oc eine ee ees hak eee as Res rar eee emer NRE ie g My eit cant iind tcc Str etl Like oon are 31 QE NUTS OF0 Meee Cah Re eer i ea in ee eee RN ieee Renner Mirae Pa ih PS uh oe aia dy CAA a hc 30, 33 relation Of, tovCooperTimiestoOne soc. 5c... gsc) ase chance o 8 3 ous ieee) steerer ete aes eerste tsi, 20 Maineola limestones): Wc. disc.) .s ececele cue Seelors co cus a eebene eter SORE Wr enh RSE La 18 OPNEFETOCKS: hee eee Sn, Bene nee Ree eae Cone oe ee 5, 32 SylaMOre:SANGSUOMO® 2c... boca 7 scape ao ol wie Boe aoe irene tecepe cat tet octet anise Some heniel ie Seectmeare if SCCHLONMat WILMA SUT kim irae UR) aoe sl le ea raiten ele RPO REL oy Ieee eee cic iey smears 28 South Bear Creek............ Taste tals Sp Cote nach SERS CAL CAE RARE CeCe an ten oie te tock ot one, ae Rane ees 29 WARK ENM CORA e-ink forece ee ausvebess XOby aces SUG eben FORE AO i cat Deanne nee ec mnn rs eerie 29 Callonemabellatula: oo... seats Seek Se eee sage a eger'a 0 at ene elie ere ou ee ase ee eae 278 COMMIS, SS ace. Soke DGS ER Slate eae aa ST atv alte Rev Sele Pence ale One Ree gra ne to a ee 278 Dab 8 0011 (SR ens sie ee ee MRR See ee oS RM em eMe nets Bt car MG ry Men ERY USCS Sa nee OES 278 (Callopora) PSLElEE ANS. Fi) csc cts ceo euicwl Sas! eas elgvlewe sods abel Dish ahetel = ayaneraien ebahere) = ance iereneRe Sina eee alah Cama OCrInUS# hy sds hee ction ood Ee See Bee Wotton a Lat ae) SW aC OS. SAREE Se otsce Nae ene ee ees 180 Camarotoechiascongrer ata, «4 sec. oaks wie woieve we Gis pele 6 cfaeseanefeles Teataae winter einaen rae 131, 142, Pl. 34 COBLE ACCA oie le oie hares bia iei wha dF osetia ete tae LED Dh Eee Ae ae ee oe kay nO CODRGSS AS) 5 een sicid co eense 07 arao UB cop cyber sass eae! a) ence rot Some Remar ome peal Lorene 41, 90, Pl. 24 16 312-(5) Cah Se Sakae ne apn re ee ERE Me Te het cease Ske ECR CUa.G ois 41, 91, Pl. 24 O10) UG: ber een ue onan eee Ane SE re IES Rr ire Coe Ne ER ES cet so eA one 131, 143, Pl. 34 SAO Se eae aad ceeded eek. SPedewe tts Pay Aes ere pitt olicl creme ae eneeteie oere eng ra 131, 1438, Pl. 34 SeLtULUSH. Sate acts > ie be pris "a: RCPS) ouster. aie least oe "Weta +e ni) dbace Mister ate) atcha sie sachs nawae sana tew ewer an ante 91 SMM Pi Caliclery sree % ce pie yeratiel a wile Relation eemealedate tee renee RTO he cate or one Ce aes he . 172 SPLICOTISIB TS ass Se ie ae tc caavans: Sictap en Spey cider lay on eace ceonseemens vecclenthe terial nena iar eaennE 14 1s a} (2) ane RRR ar ee AO er, MNT RRR Ia a yey Rd RIA PITA vee Carchen Gey hina chee 131, 144, Pl. 34 Cape Girardeau Co., Hamilton rocks.....................+.-- Ae alle al ole Mike an Dare eM 24 Cedar Valley limestone is. oe Soe Pee ion okies tad ae oe seme ea, eee Nesey Sieh ote Rae neta Accel 37, 42 relation. of,-to. Callaway Limestone: << scars cecrouc cia creee nese tele he wlcesietts is sine im alleen 35 Gantronellajeiansfared s,s .cs.c00 45 ob eee ree ie a te cases 214, 216, 242, 278, Pl. 64 Cephalopoda... 2a CS oak aera cae EE ee ails ete eae erie hee 123, 157 Sails ae pal tnt Dnt ebl er any INDEX III Page Ceratolichas gryps:....... Shy Seats CO EDULE ET aCMAS oC ER Unreal me eae 214, 218, 264, Pl. 71 RREST NIL e EE AAT a meat cree eos eto (n'a ha one a ater Te, otave,echn are elem ere hle gaia a 22. 56; 68, Pl, 374 DEEL SECU a egdunccne ei, Oc Wu Seca cea oF oi ROnSe RO NR MER Eatae PNG Lo c ae ay Be a eer ce ae es Re Seem Sour 56: PERNT ORIGIS s See RO RSE Ste pee tats nel Sho Senn Sete Se Mee Mee a St See ak A es Be ahaa ed 42 RATA ERETISISE Ce TNS eae ee eas De EW ee one ae os 41, 56, Pl. 3, Fig: 5 eS See nC OURO MOT a9 VONILAIN co sic ates siecle es Mohair eal clio hated tose ceo! Sune ctiac a; ahaha a unteta™a-epate 276 Cherokee, relation of, to Snyder Creek shale............. 0... eee eee eee eee eee eens 40 PONIES ECOL: GUS © coclens nel ecient fic Pae el el shidhias se bearable oo dyeceiaiele apaeionee Geter se 131, 138, Pl. 32 TOTE UGTA DTA FIT) So Ne lige aa cS SORE ITEM UCN? PA CPTIC A PALE ae aN care ERS Aes 131, 139, 141, Pl: 35 RLOCCHLIS Ce Decal Ren daw en Keer een: fih ta Atikd ctaten ee a shel A dpecee Ls etches bon arn Weel enn 131, 139, Pl. 32 WELLE ea eae Syn a cate aa Mer GONG ERA cilia ae ee Oa Sin ete ReRS SR a a a 131, 140, Pl. 32 Chonophyllum ellipticum................... 31, 32, 40, 41, 42, 44; 45, 52, Pl. 1, 2, Fig. 3 Ghonostrophia comiplanatacs:-..6) ci bon wees oe ee ee IE ga eesvarey Cus tehenae tan 216, 220, 237, PI. 63 jervensis...... Oe tae oe Ae cn Be MAE ER Nee Aan eat mace aE, TR) ory ic ceeabee ari Mec™ rev ateme to lalseute cog OT bie toate eae 172 Chouteau, relation of, to had Kora ery eRe SPOTME NG e's teticn coal aces ere a itomate heey abcess. Mistare ste epetons Silane tens, Glee wine 29, 30, 33 RM ONA TED MINIOS LONE. ty skh ire Sle tars ciate Meera ne Lilderay SIM adacane owraliewtaee Bee eebe eM eS eaten PaO; 13 PAM COLIPIIMNE SONGS hac. da che Mctaicy el tee rarer ctata me ahs Cialy hu tkerens Moet eso ama talsletets ns Mak iod boges 18, 19 STOR DIBR SOS SITET! AT ict nec tate CAD EW etre ORS) aN Caic ReeeryS Ore cee ae nap iceca ac 40 Ae TOPS ATO SUOME Mri s, tie tate lec eeu daecaa ile gia al cu caale'd BAC capita aie aeale Din oLaval ce duenate Raciatens 8 Se rTRNR SOUL cine cl FIELDS Ch ent ean carte. ees Bie take: sea eieute eRe eee te ee ven eelter aut ake Ue aae oe ER Bic aHal Duke Sakis Et diae Ooh 278 imho Oni vie, ACKNOWLOOMMNICHUS- CO siete solic ie este bce woe aie wie ele sccale placa soele ane @ viene 53 Cleland quoted, on Milwaukee formation. .............. 002 e cece ee cere eee eens 45 SUERTE AE Vile oe reciees ec tote tie e aieis we ale carc’ a oye slop deeMevats oe upre wleuklebe alee lets 42 PI ble ae Re eRe Rete ae eee mean Paes Aba © Sh) SHS fats Shan oe chore, Misltmull Pele die Sokae SF SSI SOE whe oleh gets 88 Coleolus tenuicinctum................ Pa 278 SPOT EA OUAD Wee Lee epemINT AES PRETRS oeih e250, cae sayy tay ail Mlle ip ceo Mae Bi dvan a sedge ew anes eal ywere audie-aia ye eee te ix Periceme SUE COUPEROMBISS, £ MC Sw cle eee i eter dekolte REG, cu 58Gb es Sine Ro keem acc ayeeasts oep atu tele gp Os 14 REPLENCONENGEIN AEP, oP dt tet ots storie Mag etc cad. SUS vc ate Ps RPGS Wir ener eh ane a ere: Geant ee Sti, are Salts cs 113, 278 BDEEMGERESE Roti wok, cv tac ceaetien tie clare aap tan atest caravan ushers 22,34, 36,112. Lal, oe, 25, bl 26 PSEC RMB Ss SN hanna chiki io ms ovr STs a WO ahs’ cae aie laterw ine Seoerehariocns 167, 205, Pl. 54 PEREEMER NCD LC Retest AaeaeeBSa, wis css Sais Palio tama ath cee eemah essa he -aal el ah athe ake Tavacnlecete sna’ Bhar Stonape gale ass 113 CIC TER SUT TEE LEIT CEA H TNS TR Se Ry an Air We Seen ere RE aa A A aR Se aa ce Ryn 173 UBHIRE sists ois Lead a feat Boa ales Synccliees a Otte OeacAcnO ean ence oF oop ato pec tcacmegee ool 173 Pe EL ROO ere OUTAIN Setar ete or aiaiate tol Picls te aleMaru ls 2 de tee md MORES Se Paste W coe ue fae Denes ede Bo 3 RG BEE MIM eESPOME GESCILPLIONM. =o ctsreroe fo CG octave aliecche ohele’ o salve cl aus Daye Jie a Gua Guettene odo cee 12 “CUSTHTE OTT EATOTU NS eco ener lees Sean Cite EAC: ny Lae ARR TC SPIE SO IRIS rae Ee ce eI ee eM ear 12 EMD DEER SS ea lyom toe eciaovd BRE: Shah MOBO LU ET TLON CMDS REDD ICR CRU CTO RC ROME RD ACRE Si corte Weenies ry ty turn 4 Re SOURIS RR CER Ue co eh oninc nin, Suey ade” AB aPell., aeaina ts Foss covis We weiobereapmiace te (aterul ote ce iat ee renee AL Ese Le: Mise SEChOSCHND ULOM bn eewier ss hesits ciakerae etl ape ciaitee Rlaps Sah y Saebapshaneea o Qa dees eS ae eee 9 APTI IME SLO IMs aueteet teem evaviare sakes om eu siecete ay SCT PELE evens Bieta ud AAPOR ah seh Pha Uh DAE CT ee 13 FSM UOIT GTO te res pe ers wal Sehtwc fesse es aie a, Pus at een eL END ian ale nae aS WE ane A pte avebav ethene rome & oP hae 13 EMAC KoA Ay ELITES COME? | anc sidiciy'ste bem chaise sete eas eh ate, ai States des wl taus Se ee ee 27 MUO LeLINIAO SHOE weet venti tee erated: suas totale: qua atereuar Ree Tete eS oea eee REE ME aR ten lena thee 21 PVicNOre SAMA SHOME Sasa hersersn o,eecloes siatsw re eran tier ordeG aerate. Pra be STEED Toe a ee ot 7 Suita te alah bop al Kerib hi OYo TUR Se arn ote See aa Ce BNE, oe i aPC ean 13 Sey Wr SLCLE SCH MLO TA ne pent ie deteg tain’ cor Soatore uch dean, Mio Asmaatalte athiacahenat beers herud st hieas te mar brah a teraremates 9 MO RIM eT LaeA OG CLUTIGIUS pois ep Woh Pav aer Sate kent oh eee Ge the ela ae A a San ball pros SL eee 173 LALA TINE CT SPECTER? 1 FER sae 9 2 ng ie oR ee A OB Ee LTA ey Be Cen ln ie ARE 2k uly Ail SOO SEMAINE MISSOUMONSIS. < 5-ssic 2 fa cele pave lees wtb woe Som ae ee Se fe Gio ict te: Aaa 227 TS PLS SHEA PEPELLP Mek sre hi wuntcte et = aeseotentan be Sade sates tessa TecaRA SS ales aoa DAML Ae PERE ER 71 Ve MEO SE CELOIM 01, + Saeet ey ta era anh op anode! a ovata ler ath Sretahats where ea eae Ae ees 39 Rea eAMAe LED BY SOCULOM saan evict Riaten ee ete oo Mats Oe PELE Dias cde ese aivla Gee ee 38 Craghead Creek shale, see Snyder Creek shale...............0 ccc sees ec eseeeceuens Biff PNT ATE AG TVG AL VATU eee fe so Fees loee care Dict dliehete iaiie atic odie © Saas letetens So pleioha exe 41, 45, 94, Pl. 16, 18 NERWOESIS Gree. A any nas eeatcger cat cat ae eae, cute a iahatt. a Seah Gein el ens 30, 35, 36, 42, 94, 95, Pl..20, Fig. 8 EAE OVENUO SU TURES 3015) ort eM eee eg Revel ccc RMTENE Nae ars “Srrohe ru buslarel AR oe OE eS. wel etal See as 14, 15 ELIA eNO ual che acl aca. Ko acaln dec egU Eye, Selb epee: Rukh a piidusl Joa My aie eee ad a el ave oD Guam ene ere 94, 95 SFSPETERELY? Por area Rae MEA TL 8s o- ncy nN CUR eevee tte a idl kava, x CSPOT digihcl Dyes wovucc hanes 22, 96, Pi. 20 BaD TEC Aree LSE DSL Wey teres REP ees c-, Poste 2% bs 2 Gnas Sea ea Re Dicer ae Re ee ae ee 167, 182, Pl. 44 HERES bVGiens EPR So hah at tin ee re ss ket ool eee ee ee eee Soy aie 45, re, eed (CLE T SUT As ARES Od. A OS Re Rea UA kee RA ODS uee nt cong ROR se Or gage 171 Siete o:ptoeten 5 Sg eee ORAL Re ie, Se MONE EES aS Mei ati er eed Ee ERE votre Cn AS oon he RAL ety 9 133 RRTANAN SAME A TLCL INA Se foes Geocoin pe A Sores, Ike Sys SL ctale See AT RMI DECREED dee 6 SR eee aly fall SoD emMELERN ULL CSCUUCALC aes, se 45 a3 So cateeione oat a heer cchin oesicboke hc Le os oe 131,°17383) Pl. 35 CPE SALT) WAITED ET AGS OSS RnR seek ARE ee eam ae ee NA hp ere eee ae Peas See ale Ream eer, 51 MRS E A MLHOR TONE Mets CY. cei kiic hess Sat ae ne ee ee ot al Re Oe ee 16 HESS AGEL Te) INLET (0) Ele Siege Ree, Se Es te in th EERE es eras Ser Aten 17 IV INDEX Page Gicivsloit0 lor: ee en oe ne a ee oe eee CE Eerie a citrate, he 59, 180, 223 Crustacediets csr iets sie Steere Ft eRe cn LEN INAS CEO A ke *,..125, 161, 208, 262 Cryphacus booth. «ofc. 2 see eee iba eae Rh RE ia mae 7a 8S atlgee a one 131, 162, Pl. 39 SD oh a vp, aie tesd, Gow She ale GEG A ELLIS STRESS cena een ocean me Se 218, 268, Pl. 71 Cyathoply Wan. iis sis cdeecs, a's cua ca spe aS Re we he Syn te ee ete mel tala sean arc ea Rate cea 14, 15, 132 PRMD 0 sie corte: ay wala bee eFC ake ook ead Pele rtd aera en aire at ds tee 34, 49, 131, 232, Pl. 1, -Mig. 2 BUCOSTM: ou ee Ute tee ti chs Coane eae oe eee ae eee iA Nae. eis ana ge 16 . Syclonema. crenulatas aac Gi eae dws = fds ol eue, ayenain oils, wrt erie aoe, weans eee edits, aha Cae ee 278 Cyclotrypa commumis........ lovin Guster levee as ssa c at eo ALS Be os 3 167, 192, 220, Pl. 49 -Edriocrinus pocilliformis............. ey tee er eee es or Aas ce, one eee ORE ibral Crisacecwlus. 2 s55...%. oo aT ee ee Poh ee eee ee ee Ree NERO ORI RA 2 Ct 215; 228, PL 57 Ben ERIS Bo keh hoe. as a ier a Oey ahw sa ee did aaa PU ewe 167, 181, Pl. 44 SN PeEREE PUNT) RETO CSeA stores tes Seelam te saci w ck ie or Belew wnene A RT oi sh such a taeepelichs .chehncer at oteMieta ae 171 Mere EON Fike MLE Tali a eta cer ce amc soewoe ve, wise celvniin Jodie to reonuelarnpecd ateysl-eVaye 22).23, 90, lot, 12%, Pi: 20 EUR tee AEA WS, oie sic chagh aise da wt enc coe rl IME Sar Soe tee 278 PDErcd NOLES MNT Es DST OLT CS 10 aa a PR ee eee x in Ma OR ee Pate 173 PST Meee SEMI EAS hea een RO, be odes ese ine Mat in ete abr. wine Si eputie, bch nusiie’ Aasoese o 42, 45, 120 RERNTOS Pee inet kh eee me eet ween hey alee Winder attest otra iam hs EAC P Sie Mh too hale yiee wala, Ra a Prarase 45 Ey LE Pe ei Reet RO NR Oro ad eR erg | oS I A 156 relva SHWAIG. 5 <3 es Ss ee oo tae ah inet ener ENP ean SL RG Etch okie crs ites Coed nich Pork iboaer Aptie 7 TOWTT SP SALTS LIN SON RE Keds Catone ame ose of NRE aro Ie Nk te ote Ona nn a oe ee 119 egeseracd uA ROE Ce Reed On oe tt nt Aes el, RN MS he x Fiat ee oO cae SW ee 22, 119, Pl. 26 MAM UION SIN. tooo oa seth Se Tee ohn waa we numiate oe Neale a Weta edbausiereus 22, 118, Pl..26; 28 PEMISUKES Ol MISSOUUL? MIE WONTAR soc... vie sic is che ole G oa) ocRav dae ees Mlle OG Soe wile Wy eovinie lod Ryde 3, 47 . F . AWONIGOS Al POHCUSIS:. ss sieve vel pistes ae ervie-s enoye 13) 44:15; 22, 23, 34, 35, 42:55, El Z, Big; 4 Bae SINS Meee ase a ay oVa al igs aol maces) «Tm S,.0 m7) © aCe Ge avbosalcooaye, shatacaia:s eh«' alba sfousicueece oy == 278 Pott ISIE Mee Pre ear at Fost Meu ese na twat er aM eer hs felide v a7 Sia caro emaudae eLaGie a aie lest sce mW S1@, Fras Re ee 278 COT EREL TASTES OW Pret cele ha Stk IPS Sn ROO Se ne a rc eR 167, 178, Pl. 41 PARELUTS CSPI Par de ee PA ENE es eis cette oP Rtas Phy bag sone) sepia slave ar aw © Cle oe nue ee 8m daw a SN ea is: AT Se ee ay ee i Se NLM A cee tn enh eeuet one os Ge Ws tg. al hel eile gah @ oe cTale AB eeeTe 222 OPS UTED NRC i eoisila tata. ys vi datelle. unnuw hfs, algt bheuBin seis cope els 1675-177, 215= 222, Pk 40,412 57 PRETOE SONIC AR ae serch hie hs Hews lap ere cacaiend Ak bid RC ngeed wine w fe #4 4 4 aa Siete tere Dieboln iil PEGEIN ALANINE, colt Sone ROME vesth aS kG avaes! 2 hw AM cue win a Al's 25. 34. 30, oF, lol, ise, wie blao Peaeed Vert SUTTER ate Fae ON MP re 7 cees am cn name eM eds ip. GcesheMecnveiion'e._b Apeyaeg eels ephia die males love aaiaters 224 ENERO LUCE TIGERS 0-5 r es Om ser a) some [eet esies br ab nics os: Kanyerel inher /OTR Seka fe. MYER ero eae a pyR ono 16 APESIOT TER EEE amet ete ic Coe ce eNGed SE Ag a lis Coc ne MMe cus -oBe AGS talus elke oe tea Eee tRaR eee, as 16 RRR N eae eee RM Rein ic cutis TOTS cuater ee che ahcr aicha Sie al arelie areal, Ne we aS egal Fie 171 STDS &, Ee Aaa Ge a Crete nn ae an ore ea a ea task Sh. geen PL 2ear TEEN 6 TRY HTU RS a PIP Gee ee UF a EIN Cig Sa se eat ae et ae a ea am a 278 MOSLEM dA R OIC IIBIS:, 5.5 cra de 5 2 ssc ee Wa «tm ate y's, oso bo a os PEE EN Ona tn ee 22, 69, Pl. 9 Ra VRASAU TANI ts: Rae en Lh cisco ete elen's a eisai ners at artes ore: abate Sirene ea, inl ar'e.ec¥ eles, bv eulete! Sie wtpte saa sive 70 SE coe PEN bar csiela ace ienaielace @o'< sn p-S0G Se ARS iy OE A A cate SoA ii 167, 182, Pl. 44 Went uUOLeGLOnisItyader Creek TOSSIIS). 5% civics ¢.5.0 2 ee an soavers.s\eitin av ete esl eee «een se 0.8 44 SER TRE ee RR ee eee Sent Phe UR ae nr cee tes Sy Sh ee a 52, 129, 165 VI INDEX Page ESIIILIN OF ar cL CULUb Al es twareiotan eo: sire Sie eheut semper ee a. Sele) arta awans) ataee ena ne ac rata 215, 223, Pl. 58 DT eee wi Seeded clescela elaine ec, Oot re Meme naga rk alg) eck ea is vais, © oot er Seas ay 167, 181, Pl. 44 WADLOLA Laie ete sta Aone’ shar stecwistet ee nauk Sere ime Wey tiel ay tae, ate chalks Benes) cr esigh oe anna eae 215, 2238, P1..58 IW OSAil lists, Bailey limestone’. ss. .'s. in. cane & ree hese ies ble. 2h Ge: eae Eee hive wel IB Gall Vas tSANGSTONGs ores hayes ucts, ark See rent abe re yece aus feo Me ee ee ee 131 Bivdsone-Shale woes. dc 5 Moscks 0 Fowles ao weet ele aloo saves eee oan ee eee Pitre Set. 167, 171 BOIS rare HIMESTONG A. cits tan cesar ec ape ene ONS ee aa enor eae nae oe ee 167, 171 Gallaway. VINESCOME. oso ocean ox eee ies 29 dee veh the Ser k Pee wach ator io. moira ce Ra Uae Gee 35 COMpPAaraG vxdhor we sia 0alels tee Roe Ce eo ce ew eine eee 167, 168, 171, 175, 215, 278 Cooper limestone............. SO ARO ERC ey moe TO a eT oe lo Trait: 14 DMalhowsres FOLCEPAO 225 0533s, ars, ac Bonin aac tee oll Medevac ee eee Se ee oe eee 167, 471 DecaturvilleCHOrnbiy, he) acs, ois: oly Sues Se wages koi teoalte ates Goan a. GR Dae gue aa nae be eee 167, 171 Gaspe, Quebec............ CL ee RIES CERES rR Cece ete oe 167, 171, 215 Grand Tower limestone,.......... ceri, Neer Nats ard tp Ja. aie beaire) av erie onerous owartoaca a eiubste one 22, 29, 70, Pl. 9, 10 BSTC REF Ano eee Petco ve nc Bene Paw oveis ais ratanen nT SRP ors, lene ie laia Late iwseveeahelse okeveaeteberame erate tem wake 70 PMSrEnOG VDA UN Gata sass. fcc eke ed ads a0 Ghans spvisiwyars Sao AACR Gare s cert AS ee los LEUTTENEMS) TANST ROSES et I aon Oa RG or ar ET eae eee ery tera 167, 176, Pl. 40 TEV UGLAILe TONES Sota, Shean St acral ty ee edit Cater CR re Seep ee ie meee | aie Aion SR, 131 162 SM AETERSTLUSSTORT ICA ULIAT chi che eee Ree tems nue teicher ec aoe Soa, My en TL Adowin Wy st ater tow doecertg layed ca suas eden rhe onehan MERE 278 Hovey, E. O., acknowledgments to....../....... ieee 600s FOE eit ch om eng Pree Se Oe peel Cs i Ee eee aC KIOW IGG SMONtS! TOs sst A's ok ee oc els oa ue Glas ie ale nie a ai & coce,sigidlalelatabsaParn ec abe x lahohby~C. EE a, SpE Ae RR Re NRE ERIS Forno. AGREE Cae SS See 56 Seed rar SE RNPENESS BNC EMMECU GW Sey So cre ora ay xP sac othe: act easy ea. ar as GRA RASH OLAS: oh W oS aylel chalyaiey Mate eS 261, Pl. 69 PApepETAU MVPS PTE CIM sph secwsnsck asdcaey-sudvces a snetoce waved el wale GAT ey Mead ee ta tin A Ea ee Se My ed 22 a be I ares ee ASRIGENELI C102 ee Teh St Seer es Eee ENE OROT NOT Mec. Alwar, Conade bast sad aera otal ote al Gk eet mete 278 2) UETIGDS,, GiOTD Die ne nie es hk eat Neel Rie Seen Rie PR RNR ets Pte carl AAG al Rae A rag 13 oh TESST S fh Thesis CAS aC ae ree Oe oa Soe ee URI aa RE Be Nai NON an EPA ern b> cote ag a vi ENUESERTA CUE UNTERPO CRU rte toe ee ee aN, Sa ian nn Smeal) ee oS ag fn tee er ay, aes ix MEE PROC ED LT INIES UOTIOUE Fase hel ea, see cute ao ca ee ean ears nee AUreL mR ae eet orate 13 “If Jefferson City formation, relation of, to Callaway limestone....................-.5. 2f.a2 RD ESOVeTE UTES ROIS: se Nwceese Sele icles are a ie hea ie eRe OM SU eae mai ier aa ec 13 Devonian...... Pee torre iis ce Ree be Pri oh Pech) AE rol Ree Ses Ne UMA ph EN Re LA RES S 6B aa 5 PMI OLA IIMIER EONS ate wis ka cheats emmar eerie 6 Olbrat ne lerh or a¥ilein cane sfecctafs Macao's ensua dvs Sie dng 18 Joachim limestone, relation of, to Callaway limestone................00 00. e eee eeeee 32 OE NE te ge a a A NG oA SRY ARN SBE cas Sos ao RCS SRO Bel le Rue RARE 5 Mangola limestone’. 50.. 00s See ees Sh Ce SPR Ee MR th oe RRP Bsn as 18 Pe PEO GENSAT OS LOIE Tc cache ene teie kes inoteeee el oar bieLeutia.cne wkale bata Rare eer eee Toe araseennc tate aie 7 ; K PSSBIOVENS: (MID HENG en ane enae Reng Me aU ROI 4 Rina ferent Pa sete yo a cea se aR 24 Kimmswick limestone, relation of, to Callaway limestone...................2---005- 32 SOCIAL RETITOS UO TG ey coh role apie, race tole Gin tad ces ay oO Dees omettal brs ava acah anally o> Coes Guan aS BT Seu ap nthe 13 MMe Ola WwIMEStONGs = ss crc cs o:svebe dvaneg des EE RAAT A Ae cnt TERN IIRC RE RT RE te 18 PON OVO EELS SOULE T RL ot tcl. wie oie atarer. seoka-s enue et Bin erorce sane ierat Soaweh crs ot se cuN a Ra ejay a eae fi TAM eTHOUK-ArelaviOn Of, 00} EIaGlc SNAIL: occur. s 6,101: no Moke th elayee atelera ¢ aueleae wulia aps lshs eumtaletayace 8 Ieee VETO WICC EIMENUS UO 20. o coke cucilis @ eceve:s. ah onele obadd- ane cove allayele ony sseseseis 2m fiaeeets x PST AMEE INTL SE CISI Non, Se ee ie cach eect eis “sicpat vaste, hee barstatte, axahintave, avenge otlalans. er ak ecme 173 TNS ES REAED SUS EM eMC MEE ere ke RG re co Shc wee aitilal ele, was. 5.5 /saeneMer ann, & VeaMRTe siiia aires Oh musEEN Se iesete 174 L A NGSUNE RST emE ORAL C ecH Ua ae Hct ee tarred er, tedous. 5 568 ae a. ooo Muduoh CON chee phiraha mamteyerehinel et ov 8 iS Teed ts ym 2 IS Ys MSE er OMITOM ALIS oc os ais. eo ereeeis. 4 bles ore ev in te leelaerane @ ele e's 35, 167, 170, 186, 232, Pl. 46 VOMtTEeOSA.5 5 5 Scis cis os ses eS Ey He EAS CRE ROR OR Ro ere TSC aE On ae 216; 220. Zar, PE 61 REARING HME UEALITAS COMB ee cree c tester taick oa: actin ee a GE ee bU AYE a) SURES. Boece #6 pr he Ras 172, 189, 190: MALOTILA ANSEL eee ites ae rahe e heen aia Care. eugene. Sree A wislie sod vue lalalniete, elena) RTC ARE 167, 189, Pl. 47 LET Ey ETS a A SRR ee a ae A ne en ee eT Ter 189, 190 Vill INDEX Page Leptodesma, TOLersl 5.4 Beg vod ce o's o «, clea chee. ov eye’ Ma abate dod a ee CaP eee ‘aha we whe 131, 151, Pl.-36 eptostrophin Maeve, is. 6 op at ratte cued aN aes tee Be tea 214, 215 Ste: Genevieve, COUntY... 0 ors sicge uc Dwietd Se ms lene te eee eae ae Bnd AP ae 0 213 POWOWURUS 5.25: 5 otha ike 5 ates wee ela ale ied teat ete ae eer faith aeons calciagle gels Rae eee ee 180 Localities, DO VOnian os cise. shal ckate Sosy on 6a Whewa da Rove ae whe one ha he Lattere allah nite ia eo nO 47 Longwell, Chester, mapping...................---- To Vang, daakanchcl & bao See ey ihe a a ix Lophospira Dilinatain. eee oe A ee ee ee, ane ieee 14 Maryland Devonian’. soso cae hoe Sats « Shere Ste cine eet al Bite retin oye a aiaiie) 5 gous paar 1 relation of, to Little Saline limestone: «=... sa cleidieiis ects ars «0s ohn © wonuale niin eae ems |e) ios 214, 215 Maquoketa shale, relation of, to Callaway limestone................ 000. cece eee eee 31 Cooper Jimestione s «5 2. access fe bes CW caret erasnne is ehatens Cae rey oh Gleeson ener et ae 13 Meek, duoted 32822 Sasneres eee ir emcee ee fh SR dS asd oes coe ee ‘ on ‘Callaway limestone.;.. Cie o lele ic big ore en Sor Date Ow eee ond 65, 66 ARSC ae eee ee ee ay sn ake sete ems ete era Madeleine he eae MRE MLSS Oe ws eb ey 65 RSPAS SALE eR eRe RA at BT oh segrael hag st atch ef ol ohcialh ae elei-s hehe esehe: clade clalade es, daw etelereawe seater 65 spinosulus...... cAetee eT RNE ACME PEENIN nD bcce cc aitcny a CR gce eG ta a ek eles ale wees ee eee oes 65 ee evento, CHOW IGG INOIMUS COly 2 tucla sie see 29, 31, 32 ROASTS ELIE SAIL = Raden Pee halo, Set Pah eaio Ce Ce ate cannielle ale ed ieva eheradara Sa ys Holepeen aie 14, 21 SALE aeT 0) WER, Ate Se Ga cea Seman Ate eli crs TC a Maes Oy ED ea es eM eS ee AN cir tara a tote 218, 269, Pl. 71 Phaenoperai Temas ss: . Hoe Ras Pa ee ee ee RSS aa ew Sree re eee oe nt re ee iba Phelps Oo;, Devonian in eos oe ce hk ails Oeste le eee Sen shee: Sree rene ay oe oe eee SRVAD Phelps Sandstone io Heiece Fe Fee Ok Tis oe ORGS SR ree reciente ree oie ee ea v6 Philhedra erenistriata: ce. Ao none. Bose here hae ke eae Sie ak ee acter Aree ae ee eee ea Al Pholidops: Oblatia: ick e3% cee CR eh ee ee aay eet enter eee 13), deo, Pes (OX) a a St ay eR SR ot On ya? Gomnee t omo caine ante a © 215 22s, bon OW ATU s oko ee eile le scence ie GLa euetetg SME Rene! oe Me, SPP FOTN Le aaron a teg ae eee kana care Eis ayer 171 iPholidtostrop bia LOW AGNSIS’s < onde ee bed sede poe eee Dee Oe eee 22. 82, dad 136. Pla PERG) C0; DO VOTTAI 5 oss Sisig 508 fu hates fat oo avec gis oe aco gh else bch na CREN ce ec Ta Reece ae eee a 5 Grassy Creek shale........05..%2. iit, haa dome ud hin Soe ale Seal foes SARS obi palates PRN Sete eee 5 Mme OlaTimestOne.: 0. .wreleis wile, v@ gral sree abe we auscentene aa ay-chehn eelete lee) aialopuhaiatelel atta see eeneenes 17 INDEX ‘ XI . Page eta EE Phe ou Use ahe eee ey oaiateie s: La ayes eyo Vetitn Grane wlecaic AE bua ab sane S kua tins ae 126, 164 Reais ESROTET LESS em RN MR te tte A cule sch Yonah tec saccie he awk a waster ee arp SE Punad eens é hss b bale a oul ectlae 65 Plattin limestone, relation of, to Callaway limestone................4..0000 0c uees 28, 32 ID Ee DIGIT 3 cadet, area ear cae en SOCCER CIEE Enc. Sete rete RS pEaen rur ie Sankar OMe a ie ene eae 5 VINEE Te MITTON LOTTE eee we et ashe sto etes Pa wari ie aaice woe wel aitacn eke ety ek waa od oi a) ehaveperuniete ckeutiiy Pins 18 PAU ATUE OENATEURS UEMLTE Meanie whake. tiesorr ttadate ond aps Sreitire ca vice arStehe Eee Pas ne wt rere ans 7 MEMS MAEE US ECLELOTE ULES ea wrote ole tc eae t armies fee of btaaradviandyo Abe re cpimaerene, ominon ae iw wigee si eehise kee wns Zi aao0. Fl. 68 CURR L EET ECE CETTE Pee en we SE No) cody knelt a eu earas ay eneemee aeny tle okt eile: che eu ai duetaire SE oe 122, Pl. 26 “GEN TTT CEES 9 cA og, a Sek Ooh, ee eer Sl eR PR aa ae eR 22, 120, Pl. 26 See MIMRR AO UL EN oP RRR 2 oie ar etic ce a cptns o's Bony meh Wiimias dete. Flea te, eigys ta ce 22, led, lel, 156, Pl. 26, 35 Bee EE OUTRO eR POI ed eee lay ics nce oe cating) els aw elie, bh eiv- oeainlke eoauey ra ersee neh E 259 (Onthonychia) CONMICUMIS . 6 fi ck dee ee ee wt Pe et ae st nas ates ae Lely 2d elo USER OSES IIC To BR Ridin © go ote Siac asic gohan CROCCE tc Ree eT TRC a acne roe ame Oi. eo, ele 69 AESER EIS TATOL ee, chy Sea ICE nS Re NER ea nae Be on 214, 217, 220, 256, Pl. 68 BREA cAI ST CUAL SH AL Vi) chee ute ccrseteteleuade wis eee Sea leuene evel ge lcte’ cans petelely «Gay, 217, 256, Pl. 68 SEU AS A A ie en a PAieaorcya Bit ORs GeusrckO ns sieeeye eee cle 22, 122; Pi. 26, 28 ENE UL RIIFIN 8 eee a ey ERG ee See AE PO an Ort nr a a POR Jpn aA 217, 220, 256, Pl. 68 Elect BIN Bie eb gi deny ere EE Got aS REE reo EE cma ae ree en 217, 257, Pl. 68 MeHeNTES | LONE TITS ee tememe tear nett crates tetewetehets leant fies ar chaust@ miaienate ai ahaten aia ananihe: ohrude bid ie jeeuben ane aca ae 173 RE AS SELUEI RCL IE) tiene ee pMENE TI Nat ci echicr. gp ehcayte sy ost a ceiialiohe cara fosten aSlevewe: ees" ads 9: ace peensiconale 217, 257, Pl. 68 PEPE PLET MEME E ORIN ee strca aero Suet vie Civ wks Sooe B,C ee ete ab cere Gaanard ee gece tee ie a 173,217, 257, Pl. 69 newberryi....... cee reco e Ua eee ewieimc alk atint: als aR lerstet eta te aLetawavae ee 217, 220, 258, Pl. 69 HSUUUAOI SLUR Giese t le ounce feee ope vay sa ye%ch a navel apie erawsiareTar 122, 131, 156, 217, 220, 258, Pl. 22, 28, 39, 69 167, 207, Pl. 54 PUREL UT LOMO RIS areas) cone e lewavis. pucvevave sh Gaswoerhe eis cate A Hanes se bch revue, aciilens.’oin ayieriaseelie ant RIE TR UCL RISERS DNL See pt th Meraae ears, ae corks HEU ofiayo: Gum. Shaeaskiots wuhteab bow yee 217, 220, 259, Pl. 69 PlanOvolvVis...... 6.5. eee? REPOS Ta Hesse Es Poaceae tial wish ale betas 217, 220, 259, Pl. 70 EME TRMET Grete Bene AY ep. er iy curs soaker ec ronele is, a tate bie wrabal aoe bee Als eiaee ts 217, 220, 259, Pl. 69 TOUPOTSUIM ec. ee et Oe er lett: ab ROSES genes aan Schirato eer 217, 260, Pl. 69 Ss EMRE cn MM nt Mandy ov hc) wore chap alin anoreee Ga TE WGeare Mea loan eal hoe 5, 167, 207, Pl, 54 EUTTEULE 2 0p re AR ecco RS pee Stn ta Sar ky Rare Sate in aba 173 POPOL IS CETL Lae erat ERT AA os The ae cise vey seas ha @ cgueld Mohidagye, ce elie s a abate 217, 260, Pl. 69 “RECLSP NUH DS WHEN TOUS pes Bo, Bee ea 8 en eek Sean ila emer Ree ee ae eet es DAR meas ree Ae Sere ar a 173, 207 ArITEE TLE PES ee eM he eater Bie ot. har? ay ace emir escape xo Moe ale Shaiya for eueaal.s 217, 260, Pl. 69 “VU SPS TEMU COVED (Gites Oke 4: Soe ae ee er are AE tear hia year re Oe En cee toe Pe eee Tey ifs UMLITAIE a ot baa AGE AS ER gat tat ot ns Sa ae nn ree a ee aE eae er Bet arti Sg | 259 ERE PERS) SOMEONE © LORI ORR neon total dee ath fore. aborted cakgoath £4 uigtane bie! aoe eeie ot bez ened eclaue a hea 25, 220 Soerel MEME TES CuMatl SMEBS ATS sen oie sinc ao gist aka acorn cogeaa Ue a etek abeoae owe es oremeeadechs cone ata ame 172 SPLEN MUME AND WATT cfs aes eek sk facut So wre bia d wrod wie ol tdueis wpb a we is ares « 216, 240, 241, Pl. 63 [OTIC Sy US ee 0b oct i Ons Nicaea ae PG NBDE iAP ininh tre oOany ise Vous eh 216, 220, 241, Pl. 64 COU VALU LETUDLCULAT Ojos ea cass chins Sys hals bhele vv Gh ee ADE oa eel a eens 171, 180, Pl. 42 MCMC OMEN CL TTA SCI L ele BUn, eer es leans 2 in Seo aes hat Ghrauks Sycustat Gcbd dl aise HO CUMS AMEE MELE Pete aes a 117 Rte Sem Ree Rene hcg tee dts suet volts ane Coals eRRGe Wieee Senta oe ae me 38, 42, 44, 117, Pl, 28 HEN DT OISG hic, of cheeses lek erie alee sea oriae ett Fe Sete fae Saar eae If othe Anite at ly SL 5733 ERDENGIUGIIGIS oe PeMe.

co Se iio le Berane ciloie ne eeeee eae % MUDSY,:: Willian aASSISGAMtE Ae. os eeis oe oes ote, Sheba e oheh sume eee ae ae ona inch tee x Ss “‘Saccharoidal’’ sandstone and Cooper limestone............. “os. & SapMead ewan cee ne es gaia icles 10 Saline Co., Cooper limestone.................. Ui din Se S-o we bl oma Ripe hee aaa ae 10 “SSandstoneé: The Old Reds. ec Rus Be ALG wo ei eae a es Ber a eee oss ie 26 Savate on Bailey Hmestone: foe eo cate ae eenane Fok 5 ered Seat nn ee ete Sane 166 Sir Aarts! US 5c) Asses Fees ata coi eet Ale ree aol) aa incon RE el cee =o 175 St» Charlés-Go.,? Mineola limestone. ...2 ou teute coon ng, Oren aa tale diane, ah cee Le 2 St. Daren Formation aos os. ew oie weet aiel'al + wisi Dee ow ale a) nae) ater nonce Bal alien et 131 St. Peter, relation of, to Callaway limestone. ...........22..22 ete neces erence eeee 27,32 Cooper limestone .«.55 2 c)s 2 6a os Css Be 6 Deve peek Soa Tis ay Se ee ree 13 Devonian,,...24-% ie ab auw SoMa & ceuse een 8% Sie taylan Ca sa pea eo Ieee ea a 5 Bureka- Shales: 5.25, 8o 20 es, fon os cient oe ac opel a RS Ree ce te age 2 re: ib Mineola THmestoneigi ine ac esse ba x oe See arene Pine ee SON on ce ite cre eae tae eae 18 Ste. ‘Genevieve: Co:; Bailey limestone ins. s:c 0. nis 4 0 tes) wats ah ere lel ce 166 Little: Saline: limestones Ii 3 ie. clip neal anes epee aecieimia eiahe, wee 10 Pet RAHN Se nee PG day ey ieee eh Seeee ea ake « & ion wee Rie abe a ara aeres yp Tape A ens 3) Megs 2 et Oey: 8 | SPEER EDS. Ss SR ey Sie Siac A a Soe a ER OY Sito ea oc PP eR 214. 2172 346, (Pl65. VERSUS oS ea SR oO a ee a Ne aN CRSA 22, 23, 102, 131, 148, Pl. 19, 21, 24 CET DMING SDB Sau ieing: Shetie R8 oR Se ee NR Oe ieee eee Pe DN 8 ei don eats 35, 119, Pl. 30 LOT hs Tis JEe Sih So ie Ae PS ei are i MRO NS nee Se | Sins ee ok aime er ae 171 PRECUEELAMCUIEI ON gee cP ye Shr Se eae Fics PCE oe Bete es alee oneal dpalca ee apeieh oe 42 43, 45, of, Pl 6 PISTOL EMA 20) 1A OE EA URE SS SOA eae Ne ane Se Reet Poe ee a Meeetas Sea ie” Al Trg ae een * Sree 176 Si nore ami GON Of WOMGATIOn. ui oc. nc bo beled Seana eM ae eek ee va bays A te 45 SESS EVD EL TEST Sh BiB on oa i es eee ne A (ee PRL Oe Se Naot oe a gn ey eee 23, 35, 61 FSPESICAITENS, Gy Soe aR pigs Ad pe aA rae ee eee. eee | SUE an eee AD 1 we get 61 TE EVG i: |, Ty, CASS A ee oie re Re tie oe eee TEA 2 ee et aio gt ly eae ot 22, 62, 63, Pl. 6, 8 PAERIMEL MAIDA Fer che Save SYS oe ic at Ate a ate eo rey ey Mice ce «oe eg: rie Ae Ne eee 22, 63, Pl. 7 (TUE SBN LEE FT EST Oe oe ae a re ALR cry el ee wate ao eet ert 63 JESUS Gi peas, Shee Set eed eo SE Re ge te A a 2263, Pl, 2 XIV : INDEX Page SUICHODOLA TILT As teste che eae ia tele tele “wae ha te ee LE a ae a ge ae 228, Pl. 60 Streptelasmia COOpPerensis, «6.16. ee ee Cone oe .13, 14, 15, 48, Pl. 1, Fig. 1 BU IGUUITL se Oeeta se Spun sue Se ge. Slee ght ce oe ee Ie eee eee a a ae 167, 177, Pl. 40 PULIALOPOLA DOUG Riis hkl «bie efecten, voy to orn ney whee ene cette eR aaa ae a toe ata aa te eek Poe 167, 179, Pl. 42 rofini(s) a 60 \ct: i eee a rs eee A ake aR eR MEE ae erat weer Ais ail terht cos 180 SNA Nene eer Rah She wee Linon Me ores RS rand Git ckeiewer rebate tere A FLEE Pret ae 180 MTISSGUPIOTISISS, \felclehe cw « bidte ue, ose 0) ia tpite ee MR CoML oi RRC 02 ahs tra 167, 179, Pl. 42 HOMO, cater etiey ee eae ee Me ne ee aes hes 38, 41, 42, 44, 45, 51, 56, Pl-4, 5 D0 Ge ee ee ae eae ere ad Ce SOM ecru Ge Sy te eo 14, 34 Strophalosia truncata.......... ee Aa Re ree wir oes ca rae crear NC a ES a ln Nien bt, 131, 141, Pl. 35 Stropneodonta waeaulcostatac. Jk. «cscs ota ee cee ie CO ee 0 SAE 5 a eS 76 Eide re Bae aeRO a REV RRM TE ee erie Vek Mee Se Se i a te oN For I cmc: et 167, 187, Pl. 46. (Leptostrophia,)) heckel, .. 2 ao2. Se se 2 Oe ew eee Be Dee eae Ce eee 172 [Stor Sieleialorithyy ets sm qeerommaie crbissike co Erolay soma 38, 41, 42, 69, 75, 76, 79, 81, 82, Pl. 11, 13, 14 GallanrayenSisiyeot co eecl ener Bk Gals See ON Sale en 41,.42,. 55, 75, 79; °80; 81, “825 Pi. 1s GOWGACa 6r sok rene aN iene het ne ORO la es haat eee int tee nate eee 24, 131, 134, Pl. 32 COODELONSISE ok a9 se, LS vie CMe Ail abs io seme UID New ecg SRE EOL NILE UE Oe oe ee 14 Costaiiains Racsie Parad: Bo eee ae ee AWE a aharc lev erat whee leew eens Roan ES ee, 35 crebristriata (Conrad)...... Pee rarer Th ee ere Fe pty ey al Tae a Poe s.c cht Ses. 172 CVE ILOTINIS?. Ooo eo oo: ct cle mane ue aaa Pela ene Sore alone re nde ene AL 76, 79, 81,82, Pits CENRISRA i Sesorc C sin een eee 22, 35, 38, 39, 40, 41, 42, 43, 45, 55, 75, 77, 81, 131, 135, 216, 232, 278, Pl. 11, 14, 61. SUUITCOS Hebbeies crac ese Gis cotta he Sates ee al ve ae eines. cates Raae oe glen eee eae 41, 42,79, Pl. 11,12 CQUUSTRIAMA As 5s wes ew oe Sole ce See eon eee ota erae Rien ataeden saree yee eater cue cae 82 AIM Bn SSO AR Soe mae RS PGS Soe Es Ree haa ITE See 42, 75, 79, 81, 82, Pl. 13 USO MIAME os, Ste aia ce ee tieiauece eee eee eee eS 80, 214, 216, 238, Pl. 11, 14, 22,.23, 61 LMELIBENI he tad choos oo Sao aig re te unin. ile, Bena 'vis yu: alle vente Ohetece hwo detthe cole Res 232 (Leptostrophia) maprnified... 5 ok ic ety sag ce tca ts cet ae el wae ph bot ee mete 172 (Brachyprion) major....... Pr ere oR ee beth oe te Ene Ge kine ot aha vid Cette Utne eee a 172 TIMP OLACTISISE rege Bee ie ise ere OR a ae ae, BO Ee A ae tae ed ea 22) Bi. "Pie Ae WOISSOUUTUCTISIS: Urares a sisters eke ce wie ola th apacian@ Deeeeen ellel cue eemONGle aera tee ieee ee eee eee 216, 232, Pl. 61 BEA Viel Ly oie tie prt 8 2 EUS eb ae | ete ED oni ok ad aE AD (5) 1150 19¢ 82, Ply 1a ae NaValis HGONWENSIS. i0.4. sca faw Wee age Sabtian aie ol occas ears RTE aE Rear tes echette eel Sie eh Sear eee fer (heptbstrophia)-OnisKanias eos kes seis ope Soames aoe tera atk fee ete POE Siac ee 4 PBET SOT es Ses hear lee cosa Bs oe eo Ua ee So LS, (35,0 oe (Leptostrophia,) splamiul dbase scx aeiic.c se Oe poten tieteon = eee cs cust cee a inn eee 167, 187, Pl. 46, 47 1 OL UL G12 eB aerated Ae ME ee SERS a MGET. tere A” se ciet oey Pee T Eh aeons eae PR cre, £6 81, 82 BD iicer seta fin re eucus: gaan gop laes alan Shel pID OR ROR asada tec teen CRe aT Uae nels Witnga ap twttnys Oat Lareme cl sce iets ener ea 39 (Brachy prion) sthuchertanas . oe ace oss ene: aoe “ato Nevdvs ie Bone ame aaa ae Cee 172 WidTUS OEE oP Rie ce Srcsees os Seehiagecs Sakon, a oehe belairel Rtas oi ciie ra Sree ORT Tae ere Buice ioe tite oohits eee ne ete eee 172 Strophonellasevassacs o-c) saus sess poe tosses eo area A RIS eae eee ae oe ae 42, 83, Pl. 11 LEAVETWOTUMANA, mS se oe MUSES So eee aU ON SS ae Cae or Ue PUNCHES A ss ore ee, oF I oe eae Coe oa aie tae ee oem hme Te ice Le eR 167, 188, Pl. 47 LO VOUSA mn eine, on ewe OS CTT RR ene eee ENS OP ETO RRA Eee cen Sees GES) Cel eee 83 SELOPROSUVITIS AL aI yee acto rene eee edephension tere are, «cele ce oe PSH Sat Stee enh Sera omnes eat aaa 258, Pl. 70 (ULETUS WEUSUS ou. s hobanh, vitae alee ww latarune adele Oise cuapabhte Steal ge ra acter aa daar ees on bcs rae 253 SPV ULL OW’, OULO UG Gy freee och ean lesa at owatowe Uceeer bic deiobeeetd eee e ara, alle MNS SG aaa otk fron Ray My ioc ec aannena aR Me ats Cee on, Callaway Timestonely yn sale ne Woe aoe las steer a pe SOO UT, esc, tee Mt ee ets ne 25 Sweoney = DevoniaiMeak nddisc snes, ad nacre Pee al aed OCU oe Rote cee eRe en a = 3 Sylamore Sandstone spor a nc Bie ocak ee a eae ay a ER ar era es es PC a Ti relation of, to Callaway. Time@stone.s . ses ocala ie sere ele ore et ee ne anes ee 29, 33 Cooper: TINIestone 2:2 5.065 Aare bal ees ee Sk ee ee cise ee a 13 PRG VOMULGUIVS Bcc) «Soe: iat ve Stearate eae SURE Lok eer eae eee eek ee Ne Co 5 Mimeotaslimestone:. i oct cine es oreo bales ae Pe eels cient: ase ie 18, 19 Opher TOME COWS toy. + etary aps: tora antes etal e |x enacatnies ah ct nial Rates tie, redone aoc eee i Snyder Creeleshales ss: oi Ye ke uae Se Pee eres al 78 San allele alae ne ree ee ee SyNONOMY. Oy iil gree aoe ake Bee let Fw cooe terete acgity GALL! & hcaceurth ete See tance ie Sates eet nee a ane AZT SVT OUTS ea eee erat ewe MRL ESO de oo DAEPRRE ae eck re Oe eT Se ee xi, 104° ch eye 0 1: i: re rs rn Manresa Ta ee ORE Et oi Ur rcarcymat Rect can ain Olt o 104 GHEMUNL SMBS yey creas oh oc chiges Soe, ee ae Re aunt CRS eee eu in cae cath ae arene 104 hannipalensis. 56 oes, So aera eae Teac bat RecN ep Ee ae eee Fig. 9 OCCIDENTALIS. Vas noms cee hee oh ee me $4, 35, 103, 104, Pl.’20; 21, 23; hie. 9 Teg Dee 25 se, Cone ar a a Dette tay ane eden he mere later Stee Mn tong er Pets cr eG Coc 104 — ee. me c INDEX ; Xv ft’ Page Tables, correlation of Devonian with other regions....... 27167 168, e171, lio, 215, 278 SENVESSee. SOCLION Of ELGIGErhere IN WEStOLDL. fi. 0 doc. o's ateve odie co's 0 eu ete 0 ote & cle cues tes 169 Tennessee Devonian, relations of, to Little Saline iiiéetistic Ee eae he gee 213, 214, 215 Tas HELA BUTE) Sy ey SHU SSS See a gee eae ea rn gl ago irra sega cn Cs ee ae 173 SCRUBS NL ae ersten, ahd See, aye''cy een alee cud hia Man nla een ohs eotciig aes bane ataly a ails 262, Pl. 69 PRONE TELLS fe mucin eve eet reel ake .c) Cane ule ca aR ale te sane ere Retake vacee Ro latele intent Aner eid ciel wn. ck ive RTeeCE CHT ALIS eeepemmen ee CL aUR nee ea, Reco cueie, eliacts acer eAahiis, Su cee ee See eM wa ae S Senay chp cd ene acaike 278 Ba. gee Sake DS Re ROS BRS yt eran nee penis eae Dea Oe 131, 157, Pl. 39 eCReRESC HERE Ch cHA SULIT LAC ASS os bepeetk oro kaany seis ahr ehats auacasshe itd, ackte a aeants dala araaahele ©.c lana vualibi al’ ecer'sue) 6 a8eye 10 SCHVaAEEN ey Oe ed CTO WSO TION Ul) ain is sts athe cp Sobol al ep Stowe r< onda Maree poe deepen cveeets, Sod glans cya be EATS ING IN IACI UNA MMMM eK vet amie cts sks) aifcee te atte teint’ (alipipe lene PSsaiaes evap oie lad Bons adh Aly GUStoey enaites aula te 173. er THES eT ha 0]s Aa ee i, Sai a eh ee ae Site aE Ce wt CE eA 167, 201, Pl. 52 PART AES EUAl ching Bove tM Fay cae es co vc eee ae eevee See ion tee penetnd os, he man Uae See 21 vee, bls CURGUT LCs [lS a AN = 2 E » y Bs i. ais ee eee, y ‘ ‘ J mars a KG ‘ a * * = . . ~~ Sater eho Me 5 Se ty . > G bf . is . ‘ bs > : Pe OSS . a A 5 LaNek > ie ry ; Ems P + \ x . ‘ . 2 ze g x ain’ N A _ ‘ , 5 fy Ves path e ie Sart . & i eas Peake 3 : a te ee Ve . ct ¥ - =e + * ; j >. DS tah ‘ R ven 7 ’ i ‘ ‘ - . . a +> ore) 2 +o bre Bing 3 +3 4 ‘ Ree Pre . > < , ‘ - r 7 we By J's i, . ce! wet rf sy at ar f + * * ; , ; . SATS » 5 ye rs v ‘ > Mi G--2 . PN. oot ** 2 is ee

*. 5 = laa se esl es a ee ee = . ’ « * * ‘ 3 , . « ' “ 4 t , . , e 1 Le p I. ” a 7 8 8 ° » “ “a , ‘ J ” a ’ a 9 G 4 ” 8 7 - we " is ” ” ie e ” 0 ‘a ” rs u “” A a ee ‘SE a 4 ro a a oo ay ” 0 ua u Pr eT] i 79 > Minsounr Boneav oF Grovoay ann Mines IL. 4. BUEHLER, Director ilocos eae | aah. ABI |New ele | Ss) ea: eal): i t “ as ” 2 a7] | y “ as ales 4” se as a“ s 6 y Dd 2 ” By 6 a Me 4 ag - 5 M CALLAWAY COUNTY Sie + Rs Jy e u ‘ s A , 2 i 6 s ml - 5 ry 5 ia 5 Sion of ; ae : a ; B. F A ; | s ’ Fale 5 : Showing i {IL Z