MARYLAND GEOLOGICAL SURVEY - hs > i ve” . hw i 1 ; = of iy Ay e/ tide : « ie” 4 ai a Sy? thal Th : MIOCENE - PLATES 7 | | MARYLAND CHeOnOGical SURVEY REMINGTON KELLOGG LIBRARY OF MARINE MAMMALOGY " SMITHSONIAN INSTITUTION MIOCENE RGAE BALTIMORE THE JOHNS HOPKINS PRESS 1904 PRINTED BY TBe Friedenwald Company BALTIMORE, MD., U.S. A. NOTE Plates I to IX, illustrating the Geological and Paleontological Relations of the Miocene, are bound with the text volume. The following plates illustrate the Systematic Paleontology of the Miocene Deposits of cad > “Maryland. PLATE X. Bigs, 1-3. SQuUALopon ATLANTICUS Weld po.sc cers cies aie occas rte ae neers 1. Portion of the right side of a jaw containing three teeth. Shiloh, N. J. Acad. Nat. Sci., Phila. xX % 2, 3. Teeth from ‘“ Miocene of Maryland” labelled “ Basilosaurus atlanticus.”’ Acad. Nat. Sci., Phila. Bigsby ISQUALODON PROTERVUS: COP wae cia sisiccice etetarsiereiorereren erties 4. Tooth. Charles County near the Patuxent River. Acad. Nat. Sci., Phila. 5. Another tooth from the same locality and collection. Hie. 62 -PRISCODELPEHINUS! GABBI (COPE! Se suevejaictasi= 7. Lumbar vertebra, lower view. Charles County. Acad. Nat. Sci., Phila. xX 2% 8. Caudal vertebra, lower view. Charles County near the Patuxent River. Acad. Nat. Sci., Phila. xX %. 10 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE X. pa “se MAMMALIA. PLATE XI. PAGE Figs. la-3b. PRISCODELPHINUS (?) CRASSANGULUM Case..............-.. 12 la. Inner view of tympanic bone. % mile north of Governor Run. Sas 1b. Outer view of the same specimen. xi 2. Posterior view of left occipital region. Same locality and col- lection. X % 3a. Upper view of lower jaw. Same locality and collection. xy 3b. Upper view of upper jaw and anterior part of the head of the same individual with the occiput removed. Same locality and collection. xy MARYLAND’ GEOLOGICAL SURVEY. MIOCENE, PLATE XI. MAMMALIA. PLATE XII. Figs. la-le. PRISCODELPHINUS GRANDAEVUS Leidy ............e0eee000008 15 la. Specimen from 4 mile south of Chesapeake Beach. Maryland Geological Survey. 1b. Another view of same specimen. le. Another view of same specimen. MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XII MAMMALIA. PLATE XIII. Bigs. lal ibe VESACANMET SUS TONS) CODCUsjeterrere cleus cleqnicietsncvoielerneterennncnatste 16 la. Lateral view of lumbar vertebra. Charles County near the Patuxent River. Acad. Nat. Sci., Phila. x % alo}, Posterior view of the same specimen. x % Migs. 2-4." xX ACAw THUS) SPINOSUSHOODC a oi er eiece-ecerecc coayctere meen nsree tian eea ane) are elebarete 17 2. Lower view of a posterior lumbar. Charles County near the Patuxent River. Acad. Nat. Sci., Phila. x 2% 3a. Superior view of a cervical. Same locality and collection. x % 3b. Anterior view of the same. x % 4. Lateral view of an anterior lumbar. Same locality and collection. x % Bigs: ba-0. LxXAcAnNrEUS AMROPLUS: COPE! cys rieiciers ceteris > casio ional amen ats 18 5a. Lateral view of a dorsal. Charles County on the Patuxent River. Acad. Nat. Sci., Phila. x % 5b. Anterior view of the same. x % 6. Lower view of a dorsal. Same locality and collection. x % ou MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE Xill MAMMALIA. PLATE XIV. Bigs, dil.) LXAcAn mH Si COMLOSPONDY EUS! COD aseimeieriirin cranier ernie 19 1. Lower view of alumbar. Charles County near the Patuxent River. Acad. Nat. Sci., Phila. x % : 2. Lateral view of a lumbar. Same locality and collection. xX 36 Migv3. AREA CHIS! MLAGCHDEATOR MO ODEN ciemitae crs cciclelsisietererratiatetere sick eieeene 20 3. Lower view of a lumbar. Charles County near the Patuxent River. Acad. Nat. Sci., Phila. x % Mica. (CETOPHIS, HUTEROCEIBUS «CODG mate ianceee ns Sete ee 23 4, Lateral view of a lumbar. Charles County near the Patuxent River. Acad. Nat. Sci., Phila. xX 3 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XIV. MAMMALIA. PLATE XV. PAGE Miss: l-b. -REABDOSTEUS) LALIRADDEX CODEN.) aes eile eiere sei erate eels 24 1. Lower view of rostrum. Charles County near the Patuxent River. Acad. Nat. Sci., Phila. xy 2. Upper view ot another rostrum. Same locality and collection. x\% 3a. Tooth from the anterior portion of the rostrum. x 3b. Another view of the same tooth. x4 4a. Another tooth. Same locality and collection. xh 4b. Another view of the same tooth. x % 5. Another tooth. Same locality and collection. x MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XV. MAMMALIA. PLATE XVI. Figs. la-le. Lornocerus CANOETEIS (Harlan). ta. ‘Lateral ae of skull, ae an ne 1b. Lower view of skull. xy P le. >. Upper view of skull. xy ( after Harlan). : aa. 4 ¢ tl ( ey Oa et ve +: . ~ Le A 4 4 hho *. Ay My TA Ree ' \ MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE Xxill. a 2B oy 10,0 f -0000000, MAMMALIA. PLATE XXIV. PAGE Migs dat pliby sWELASSMORATUSECODGracraeiercinel tein errr iete erie a meeciena 50 la. Outer view of lower jaw. Miocene of Maryland or Virginia. Johns Hopkins University. x 1b. Upper view of the same specimen. Migs 2) (bADAMNOPTERA iSURSTPLAN A CODClisstscuecieicle cin clsimieelatcientar Craiaretae 54 2. Tympanic bone. Miocene of Maryland or Virginia. Johns Hop- kins University. x Figs. 3a, 3b. NATURAL CAST OF A CETACEAN BRAIN CAVITY...........---. 56 3a. View from before. x% 3b. View of the same specimen from the side. x% 16 MIOCENE, PLATE XXIV. MARYLAND GEOLOGICAL SURVEY. MAMMALIA. PLATE XXV. PAGE Lettering: 2H. G., External gingival canal; J. G., Internal gingival canal; G. G., Gingival groove; D.C., Dental canal. Bice (CerOroERTIUM sPARVITM: IUMOWMCSSALEsacal cteteiaiereteletelieialsteyelersie tanetareletsle 44 1. Section of left mandibular ramus. After Cope, Proc. Amer. Philos. Soc., Vol. XXXIV, Pl. VI, Fig. 6. xy Mig?) ULRETULTAS BUCGATUS MGODE) jitccrkeieisrcteteeetelcleiwereeteholarenslseeteiehe hs lat 52 2. Section of left mandibular ramus. After Cope, Proc. Amer. Philos. Soc., Vol. XXXIV, Pl. VI, Fig. 2. xi His 3%) SIPHONOCELUS EXPANSUS i CODEC wei evehe ray eieretelotee)-tetsieboter MESOCETUSSIPELUNCULUSY COD ti sarchaicleatiele setts eleieiekessietetiieriet 34 12. Section of mandibular ramus from Virginia. After Cope, Proc. Amer. Philos. Soc., Vol. XXXV, Pl. XII, Fig. b. His. 135 ICkTOTHERIUN, (CHPHAT ONT | © OPC aetettet iets te lnetcte ste) elererelonseteienniens 44 18. Section of mandibular ramus represented in Fig. 8, proximal of the middle. After Cope, Proc. Amer. Philos. Soc., Vol. XXXV, Pl. XII, Fig. 2. x 17 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XxXv. y IG \ : 26 pe ad | 4 ecg G; 8 EG VY 1 G SS ae MAMMALIA. PLATE XXVI. PAGE Kies.) LRicHhCHUS GIGANTEUS) (2) (DERKiay yc crstertatecteleseietonel cesteisesl tedster 56 1. Radius and ulna. Fairhaven. xX % Bigs 2!) SULA LOXOSTYLA (Cope is s/:crevctesiciovs as as a one sede erararns ose a epeneleneerenenn 58 2. Coracoid. Calvert Cliffs. American Museum of Natural History. x % Bigs, 3) 45 JPURRINUS CONRADY Marsh! ies etec) sm eyiclet= sie sretcloreieiel sr ctaleretnsietaicreie 60 3. Distal portion of right humerus. Miocene of Maryland. Acad. Nat. Sci., Phila. 4. Distal portion of right ulna. Same locality and collection. Big. bi “CHELONE) SD iy ecic wis roncas tesetre ave aa lea ices ot alte atarecea token coat) acemetenere me tome 64 5. Proximal portion of scapula. Plum Point. x % 18 med MIOCENE, PLATE XXVI. MARYLAND GEOLOGICAL SURVEY. AVES AND REPTILIA. MAMMALIA, PLATE XXVII. Rigs: 1, 2) Mamcacmanmsa (2) SSHRIGODON Cope) - ace -- leloare)-eretrelroate 1. Tooth. Charles County near the Patuxent River. Acad. Nat. Sci., Phila. 2. Tooth. Same locality and collection. Migs. 18-55 JTeEcAcmanrrsa’ ((?)) iStcaRtar (Cope! 22s ayes ere see cre aie earn 3. Crown of atooth. (After Cope.) xX % 4. Portion of lower jaw. (After Cope.) x 26 5. Another view of the same. (After Cope.) x 26 Figs: 6a, 6b. THrcAcHampsa (7?) conrusor Cope ...............5..05..- 6a. Lateral view of tooth. Charles County near the Patuxent River. 6b. Basal view of the same specimen. Bigs, 7-9) DanCAGEAMrPSAy NG?) AINTTQUAL (CLG ya) iersr-raetctay-ttenederenoteterenenenbene 7. Tooth. ‘High cliffs of the Potomac River, 40 miles above the mouth of the river in Westmoreland County, Virginia.” Acad. Nat. Sci., Phila. x % 8. Another tooth from the same locality and collection. x % 9. Another tooth from the same locality and collection. x % 19 PAGE 66 66 67 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXVII. REPTILIA. PLATE XXVIII. Figs: da, ibs (SouamimacOcGipENIDADISs 1: SD avrsierate evoterare one ehearchenalereteloiere erates la. Outer face of tooth (type specimen) showing downward prolonga- tion of the enamel below the base of crown. Plum Point. x 4/3 1b. Inner face of the same specimen. BE 2. MEUATIAGS (?) EDUC ODE Aryeh avois eustaietene aus loess caeste ieaelichoon rete tec teen ane 2. Superior aspect of a detached and considerably abraded dermal tubercle. (Type specimen.) Charles County near the Patuxent River. Acad. Nat. Sci., Phila. igs: 385 cba mV by nIOBAITISNGIGA'S ICODC Wy lcmcre aceite tareeceheunalrenhere tier orererer eters 3a. Oral surface of the upper dental pavement of an adult individual, the anterior end (shown uppermost in the figure) fractured and imperfect. (Type specimen.) Charles County near the Patuxent River. Acad. Nat. Sci., Phila. 3b. Transverse view of the same specimen, taken across its posterior end (at bottom of Fig. 3a). PAGE 73 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXVIII. 3b PISCES. PLATE XXIX.. Rigs: slas Ub; GMYEioRATIS VGIGAS: Cope ic .cy.s nus are et ajty oe ee tove erence pe eee la. Oral surface of lower dental pavement, somewhat worn, and showing line of longitudinal striae or fissures of the gano- dentine radiating backwards and outwards. Charles County near the Patuxent River. Type of the so-called “ M. vicomi- canus.” Acad. Nat. Sci., Phila. lb. Transverse view of the same specimen at its posterior end (across the bottom of Fig. 1a). Higswza nbs MyaiOBATISSPAGHYODON CODE! crmiiicristeleteneie teats oieieyemees iene tees 2a. Oral surface of imperfect lower dental pavement, the anterior end shown uppermost. (Type specimen.) Charles County near the Patuxent River. Acad. Nat. Sci., Phila. 2b. Transverse view of the same specimen. igs 3) “ MiyaTORATISHERANGEINS SMorSIDl seacteptevers tate xelleie ce velonerescycasieterolterene ai teetons 3. Oral surface of imperfect lower dental pavement, somewhat worn, and showing curved outline of the anterior depression due to wear. (Type specimen.) Charles County near the Patuxent River. Acad. Nat. Sci., Phila. Rigi 4. *VEvnTOBATIS=ORWERY GON {(02)) SDs so cy.rsiccvecsieiece clateseiecelsre cio ererecenete nee 4. Portion of large caudal spine of an eagle or sting-ray. Charles County near the Patuxent River. Acad. Nat. Sci., Phila. Hig, 5) .ABTOBATIS) ARCUATUSVASASSIZ¢ 205 sienna erorelars eckeveis teistele tetsint etait natoe . 5. Inferior aspect of fragmentary tooth. St. Mary’s River. Figs. 6a, 6b. NOTIDANUS) PRIMIGENTUS AZ@SSIZ......000..0ce ners eres s ee 6a. Inner aspect of tooth, the root much worn away. Plum Point. 6b. Outer aspect of the same specimen. 75 75 92 76 77 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXIX. ror ry nny iN a whe Ki \ mee Te ==/2 ea = a PISCES, PLATE XXX. Migs: lias lb: \ODONTASPISHCUSPIDATA s (CA PASSIZ)) a micteictlaccciis cietereisenonetereetere la. Outer face of a tooth showing a rudimentary second pair of lateral denticles. St. Mary’s River. x 4/3 1b. Inner face of the same specimen. x 4/3 Miss) 2a) 2b)3-8 ODONTASPIS ELEGANS: (GAIPASSIZ)) |SURCULAUENGONATAN CONTAC ry aererciccldsietc cistern eneratelereicterereie 151 15. Ventral view. St. Mary’s River. His sel6y eS URCULABROTINERAN CONTA GMs rier ior tie sisieisiinieeeiieiereie eieeiieiaias 152 16. Ventral view. St. Mary’s River. Kies 17, (‘SURCULA) MARTANAY MS ‘SPiscrsrcieieievcsiess sis = one susie s)e)stedoneveieverer«(evererclotove 152 17. Specimen from St. Mary’s River. 33 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XLI. MOLLUSCA—GASTROPODA, PLATE XLII. PAGE Migsh a2 MAN GIDEASPARYiAu (CONTAC)! sierae wrerrcteletetetoters date etoteeletereisieiecstoienaea 153 1. Ventral view. Cove Point. 2. Ventral view. Langley’s Bluff. Mig. ot. PMANGILIA sPARVOIDEA\ Mt SDs, sicisssiate ee saretere crete aleve ere niaiele evel rere areas 154 3. Ventral view. St. Mary’s River. Wiz. 14. MANGILIA ‘CORNELLTAIA! ‘I. ‘SPs siclelexesrelsare erexore cl sie vivis arelersicisteversreicl eve 154 4. Ventral view. Plum Point. Cornell University. Mics Die MAN GILLA PAT URE NCTA Tepe SP syveerstcteretcterais/=tavsraisteleiersis:onrererseeteneterelers 154 5. View of specimen from Jones Wharf. Hig. 6. MANGIELA (GLYPHOSTOMA) OBTUSA NL. SP. F2....--c ee ewe ese news 155 6. Ventral view. Plum Point. Hie iei, pOORIGL LAS IN CIIFER Ag (CONTAC)! <)acuxcctelecelteletereierereraies stetoiere cesta erent 155 7. Ventral view. Cove Point. Hig sh DRILLTA INCILINER AS VAT ANG ULATAl Tn Vallone stcpereretere croieiosrevsie terete 156 8. Ventral view. St. Mary’s River. igs 9.) DRIULTA INCIEINERAY VAT DISTANS 1( CONTAC) ae cvereiote stenteleletelerctenteterene 156 9. Ventral view. St. Mary’s River. Wigs LO.) LD EMETAS WHETETETDYT) Ms, (SPhisiertsieieis wise sicrereis uelelereters Waliiouelepeteee Meee 157 10. Ventral view of type of D. elegans Whitfield (non Emmons). Jericho. New Jersey. U.S. National Museum. Figs, ccc -c-n casei cree vetalnetetetatete 274 1. Exterior of left valve. South Carolina. (After Tuomey and Holmes.) Migs; 2c. eBARNEA ((SCORINA) FARCUATA. ((\COUrAG)) ese on -seeereaeeiee ere 274 2. Exterior of right valve. St. Mary’s River. 3. Exterior of right valve. Same locality. Migs, 4:9; MARTESTA IOVALIS: (Say) och an criss ope coseuniecc snes cuctepyemsrers otal 275 4. Exterior of right valve and broken protoplax. Drum Point. U.S. National Museum. (After Dall.) 5. Exterior of left valve and protoplax. Jones Wharf. 6. Exterior of right valve. Same locality. 7. Interior of left valve. Same locality. 8. Dorsal view showing gaping anterior and umbonal region pro- jecting from enveloping tube. 9. Interior view of protoplax. Same locality. Bigs WRANOP EAS WER MN DN Lai) oi lLM a rnrkanetey chatter ete iataiotsvaictereteceterionensnen stone tenerals 276 10. Exterior of right valve. Plum Point. a a MIOCENE PLATE LXV. MARYLAND GEOLOGICAL SURVEY. MOLLUSCA—PELECYPODA. PLATE LXVI. PAGE Rig a VPANOPEA: GOERDEUSSIM | WAETIOD solos eis icus.s:olsiatobohenel ete etare tere ae ale fo sfela rane 277 1. Exterior of right valve. Plum Point. Hig 2) PAN OPEAY cAIMERT CAN AGN CONTA Gin srepnarstertsieteierstereiert-tar rere sore oe renennencrene 278 2. Exterior of left valve. Plum Point. HSS 3-65) SAKTOAWAWAROTIGA (rim) i merctcrms a ciehess)crels|cus) crersienserehereRetevionetenetete 278 Exterior of left valve. Plum Point. Exterior of right valve. Jones Wharf. . Interior of left valve. Jones Wharf. . Exterior of right valve of one of numerous distorted forms. Chesapeake Beach. Ole MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXVI. MOLLUSCA—PELECYPODA. PLATE LXVII. Migs: 1-3: (CORBULA. IDONEA ‘COMER yacicj0 oayejere elale lela, = C= SX C°_€oypy ae SSS iS SS MOLLUSCA— PELECY PODA. PLATE LXXXI. PAGE Fig. 1. VENUS CAMPECHIENSIS var. CAPAX (Conrad) .............see005 308 1. Interior of left valve. Cordova. Fig. 2. VENUS CAMPECHIENSIS var. TETRICA (Conrad) ................ 307 2. Interior of left valve. St. Mary’s River. MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXxXI. MOLLUSCA—PELECY PODA. PLATE LXXXII. PAGE Figs. 1, 2. CLEMENTIA INOCERIFORMIS (Wagner) .........---.++ecseceee 315 1. Exterior of left valve. Cove Point. 2. Interior of broken right valve. Same locality. Fig. 3. VENUS CAMPECHIENSIS Var. CUNEATA (Conrad) ................- 308 3. Interior of left valve. Jones Wharf. 74 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXXIl. MOLLUSCA—PELECYPODA. PLATE LXXXIII. PAGE Rico DOSINTASACE TABU UNE COMRE Gira isisiciecitelstottrersiteheielciercierseketetelors 315 1. Exterior of right valve. St. Mary’s River. Fig. 2. VENUS CAMPECHIENSIS var. CUNEATA (Conrad) ................ 308 2. Exterior of right valve. Jones Wharf. x on MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXxill. MOLLUSCA—PELECY PODA. PLATE LXXXIV. PAGE Wigs de DOSINTA A GETABUMU MeO ONM AC ltarerels celetalciisteleletalariertelei-ye) taterrenrelene 315 1. Interior of left valve. St. Mary’s River. Migs: 2;\3- ISOCARDIA MARKORT CONTAC jie -eloiyeiereleleel-r-ieleleiseister siete tact sielle 316 2. Exterior of right valve. Plum Point. 3. Interior of left valve. Same locality. Migs: 4,5: TSOGARDTAY BAZ TWA OMS, (SI! a . BY CENA CALVERTENSIS) SoS) ctalecoleictere ee levereisre tere ceieval etersrntel lene! citer 327 16. Interior of right valve. Plum Point. Rigs 17. MEY CEVA SPRU NAN Al. tS Dares ercteteletsten pclae ist vetataietetere relator afeteleteieretehere tater 327 17. Interior of right valve. Plum Point. 79 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXXVII. MOLLUSCA—PELECYPODA. PLATE LXXXVIII. PAGE IME aR, UDI ACIONON, MIO As CMON Tak, Sid, SoohoononnbagonoooeosedeD oon DGD 328 1. Exterior of left valve. Three miles south of Chesapeake Beach. 2. Interior of right valve. Same locality. 8. Interior of right valve. Plum Point. U. S. National Museum. (After Dall.) Migs 4ae A De ORY GIN AMR IG KARD PAUL ES) silalcteleliepelatelsialsietstalctetlstelatetelsletelsti tate 328 4a. Interior of right valve. Plum Point. 4b. Exterior of same valve. Migs (53> ORMGINASPEOLOS AU OSD este ie tatencle. 337 3. Interior of left valve. Jones Wharf. 4. Exterior of right valve. Same locality. Figs. 5, 6. PHacomres (LUCINOMA) CONTRACTUS (Say) ..........----+00e 339 5. Interior of left valve. Pawpaw Point. 6. Exterior of right valve. Same locality. Figs. 7-9. PHAcomEsS (HERE) TRISULCATUS (Conrad)...............20-- 337 7. Interior of left valve. Plum Point. 8. Exterior of right valve. Same locality. 9. Interior of right valve. Same locality. Figs. 10-12. PHaAcompES (PARVILUCINA) CRENULATUS (Conrad)........... 340 10. Interior of left valve. Cove Point. 11. Exterior of right valve. Same locality. 12. Interior of right valve. Same locality. Rigs 3 PA COIDES) (PARVIHUCINA) SPRUIN Sa) alle ete ictelelefoleleielercteneistertetstetenats 340 13. Exterior of left valve. Plum Point. U. S. National Museum. (After Dall.) x 3. 82 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XC. MOLLUSCA—PELECYPODA. PLATE XCI. Higss 1-35 (CHAMA' CONGREGATA CONTAC! crartnciaistorcvelexetotars elere cic oire iat 1. Interior of left valve. Church Hill. 2. Exterior of right valve. Same locality. 3. Exterior of right valve. Same locality. Miss4-6,) CARDITAS PROTRAGTA(@ONTAG) I ere miele ela isiseeadetce tel eteten reer 4. Exterior of right valve. Governor Run. 5. Exterior of right valve. Same locality. 6. Interior of left valve. Same locality. Figs. 7-10. VENERICARDIA GRANULATA Say ..-.2..:0--eec+s-e-s-ees 7. Exterior of right valve, large variety. St. Mary’s River. 8. Interior of left valve. Same locality. 9. Interior of left valve, smaller variety. Plum Point. 10. Exterior of right valve, smaller variety. Same locality. Bigs: 19) 125 \VENERICARDEA CAS TRAIWA EM SD ieteiaie stare nislale ote nieyerstsinlerstonere 11. Exterior of right valve. Church Hill. 12. Interior of left valve. Same locality. 83 PAGE se 345 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XCl. MOLLUSCA—PELECYPODA. PLATE XCII. PAGE Bigs) 125 (CRASSATELLITES MELINUS! (COMLAG)) sy cmiciecteicre nieteleie ie cietaten terete 346 1. Exterior of left valve. Plum Point. 2. Interior of left valve. Same locality. x 8/9 Migstie-b. (CRASSATEREITHSETURGIDULUS) ((CONTAG) I pictecteds ceisler 348 3. Exterior of left valve. Jones Wharf. 4. Exterior of left valve of young. Same locality. 5. Interior of left valve. Same locality. 84 MIOCENE, PLATE XCIl. MARYLAND GEOLOGICAL SURVEY. MOLLUSCA—PELECYPODA. PLATE XCIII. Figs. 1-3. CRASSATELLITES MARYLANDICUS (Conrad) .............---e+ee 347 1. Exterior of left valve. Dover Bridge. 2. Exterior of left valve of young individual. 3. Interior of left valve. Same locality. Figs: 4-6: ASTARTEH CUNEIFORMIS*CONTAG) cicnsieci «6 cc wesc clr « cvetlo a ajasatete s vnone 353 4. Exterior of right valve. Plum Point. 5. Exterior of right valve. Same locality. 6. Interior of left valve. Same locality. igs) f-9)) ASTARTECASTRANA SES Dele rhein ele ieichetcneneteletel-teletsrersiaicterai-taist-aeiretde 353 7. Interior of right valve. Reed’s. 8. Exterior of right valve. Same locality. 9. Exterior of left valve. Same locality. Bigs, LOf1 0. ASTABTEVIOEN A; Say cere iets ois ok verano ca svalie's ave layo shatatans/eVerereyeleterete ate 350 10. Exterior of right valve. Plum Point. 11. Interior of left valve. Same locality. 85 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XCill. MOLLUSCA—PELECYPODA. PLATE XCIV. PAGE Migs: i925 ASTARTE THOMASTT CONTAC vacrrereleiicieteletcteristerel secielesleiteverisienens 351 1. Exterior of right valve. Plum Point. 2. Interior of left valve. Same locality. Figs: 3; 4: ASTARTE CALVERTENSTS MisQDiotaicconere aie eunlese-¢ eeusvorsionee sie creioierenetennens 352 8. Exterior of left valve. Plum Point. 4. Interior of right valve. Same locality. HSS 16s PASTAR TE OBRD MAN © OUMACL gta retetetoneralstel-teier-hepeleteiiensistcielstekerenetceoters 354 5. Interior of left valve. Dover Bridge. 6. Exterior of left valve. Same locality. Ripsel-9) ASTARTE MHEG PHOT Aw teas Dimtetelcreielereesoteeuets iialoiel cic lekerereiclctdotenetenettake 355 7. Interior of right valve. Jones Wharf. 8. Exterior of right valve. Same locality. 9. Exterior of left valve—the most characteristic drawing. Same locality. Wigs wh aie -ASmAR TE PRERPLANIAN CONTAC Umm ciielereisierelolelstercisicrsichetsterseieter-ketate 356 10. Interior of left valve. St. Mary’s River. 11. Exterior of right valve. Same locality. Fig. 12. CRASSATELLITES (CRASSINELLA) DUPLINIANUS Dall ............. 349 12. Exterior of right valve of type specimen. Duplin county, North Carolina. U.S. National Museum. Figs. 13, 14. CRASSATELLITES (CRASSINELLA) GALVESTONENSIS (Harris).. 350 13. Exterior of right valve. St. Mary’s River. 14. Interior of left valve. Same locality. Migs ib sASTARTE SPAR NCAA DD RIT rec avahetetoneteratcleseystelerenciatercierers Cemeveleratotene etek tates 357 15. Exterior of left valve. (After Dall.) x 4/5 86 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XCIV. MOLLUSCA—PELECYPODA. PLATE XCV. Figs. 1, 2. PanporA (CLIDIOPHORA) CRASSIDENS Conrad ................ 357 1. Exterior of left valve. St. Mary’s River. 2. Interior of right valve. Same locality. Hig. (3:, IPERIPLOMA PERAL TAY CONTAC, AED ASGIGrATA VAT. AMD RAEI AMIL Voyercrstarcyete tereketeisieteneteteterel stevens telat 396 9. Interior of left valve. Plum Point. 10. Exterior of left valve. Same locality. 99 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CVII. MOLLUSCA—PELECYPODA. PLATE CVIII. Bissied |) 26) EEDA ICON CEN TRIGA (OYA) ircyaretoetetetervetelototeteteNeherotaiovancteneiehietel= Tate tees 1. Interior of right valve. Pocomoke City Well, 53 to 75 feet from surface. 2. Exterior of right valve. Same locality. WIS 5,45, LOEDUAGE AVIS AGSALYA)! foteteccciacelmpnceresstekenereveranatepepol cre ravahac ete ete nene tele orale 397 3. Interior of right valve. Jones Wharf. 4. Exterior of left valve. Same locality. IME Geis SINE’ Tiyoran"Ne SERA Gnhonooogenamoucoobnaducbacuonsacdos 398 5. Exterior of right valve. Dover Bridge. 6. Interior of left valve. Same locality. Micsts i) Ss, MNUCULEA: SINARTA™ MD) alll” Recyercrcusrs avehectenstatetctsloteleclesrolensier retetor tetera 399 7. Interior of left valve. Cove Point. 8. Exterior of right valve. Same locality. Kies, 9-11. ANUCULA TAPIA: Dally ate cvcrerecue seve cle lounievele nse ctalereoe cto eis aletoheiete 400 9. Interior of right valve. St. Mary’s River. 10. Exterior of right valve from Natural Well, North Carolina. U. S. National Museum. (After Dall.) 11. Exterior of right valve. St. Mary’s River. Migess) 12-1469 NUCULAY SPRUNTCOTAUHD allen crpetsyscateretevererevelevetsreneloreciorinterieteieare 401 12. Exterior of right valve. Plum Point. 13. Exterior of right valve. Same locality. U. S. National Museum. (After Dall.) 14. Interior of right valve. Same locality. 100 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CVIII. MOLLUSCA—PELECYPODA. PLATE CIX. Bigs: dea) SDISCINISCA. LUGUBBIS) (Conrad) lien. ceiiteileleroieieretsteneterenelonsratelsite 402 la. Exterior of dorsal valve. Jones Wharf. 1b. Interior of the same. 2a. Exterior of dorsal valve of another specimen. Same locality. 2b. Interior of the same. 3 Interior of ventral valve. Same locality. Figs, 4; ‘b. “DHEONOA GLOMEBATARIAISDs cue x cies c c/slele le savsiereisferiatere oleionmreete 406 4a. Upper surface of a large specimen. St. Mary’s River. x 4 4p. Another view of the same. x 16/5 4c. Under surface of the same. x% 5a. Upper surface of a small specimen. Same locality. x % 5b. Another view of the same. x 16/5 Figs:6-8: Ip MONEANGR)MEXPA NGA. Ms ISP aeucicisrareclsioieraciersra citaatslesel ate teveunietermtenets 404 6. View of a young specimen. Cove Point. x 16 7. View of another young specimen. Same locality. x 16 8. A large specimen from the same locality and attached to the same shell, showing the pinnate arrangement of the zooecia adopted in later stages of growth. x 16 101 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CIX. MOLLUSCOIDEA—BRACHIOPODA AND BRYOZOA. PLATE CX. PAGE Hizey) MME MBRANTPORA FOSS ULIEDRAvN SD. cies ciusreleyereiaieecnenet hee ensteaeiere eneeae 4908 1. Portion of the surface of a fine specimen. Reed’s. 16 Figs. 2-5. M@mMBRANIPORA OBLONGULA TD. SP. 2.2.5.5 2. ee eee eee cece enses 407 2. Surface of an average specimen. Governor Run. x 20 3. Surface of another specimen having thicker walls than usual. Same locality. «x 16 4. Portion of the surface of a specimen having relatively larger apertures and thinner walls than in the more typical form of the species. Plum Point. x 16 5. Portion of the surface of another specimen showing irregularity in development of some of the zooecia. Governor Run. x 16 Hizii6.) MIGROPOREEUASPRANOLE DAMA TI SDS treiore le ebeale)s oles) 1 eel elnietel=taie estate 415 6. Portion of a zoarium of this species growing on Pecten madison- ius. The ovicells are more abundant on specimen than usual. Cove Point. x 16 Fig. 7. MICROPORELLA INFLATA Tl. SP. 2... ee cess eee ee erence eect eecens 416 7. Portion of the surface of a specimen growing on a small mollusk. Jones Wharf. x 16 102 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLAT ebay teeth iY ret Ve ‘' ) se MOLLUSCOIDEA—BRYOZOA. PLATE CXI. PAGE Kies. 1, 25) WMEMBRANTPORA PARVIOI AU MS SD en a sreler-teleleletdsiotel= aps eielorereretsteterletelel= 410 1. A portion of the surface. Reed’s. 16 2. Another portion of the same. X 16 Figs. 3, 4. MEMBRANIPORA CAMINOSA ND. SP. ...-..... 0 0c e sense ee eeeseees 409 8. Portion of a well-preserved specimen having ovicells. Jones Wharf. X16 4. Portion of another specimen not so well preserved and having very few ovicells. Same locality. x 16 USS Eeb=1 se LED MPORAMDOVERENSIS Qe SI rite a yat-iaislalaietencqetel tenets teu taleistetsieneratet tates 422 5. Celluliferous surface of a small fragment. Dover Bridge. 32/5 6. A few cells of same. X24 7. Portion of the reverse side of another fragment from the same locality. X 32/5 Higss 8) 95 MEMmBRANIPORA] GURMAIAN DSPs) tpesetehevsnel-ialehebele treks tei-iekelot-ueteteletele 410 8. A portion of the surface of a specimen in good condition. 16 9. Another portion of the same. XS ils} 103 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CxXl. MOLLUSCOIDEA—BRYOZOA, PLATE CXII. PAGE Big. SVEOAteRsNreORA uNTTIDuIAN Te) SDs lccckereicle «ia lisl|c cleiveleyele eisievets Reokererrene 412 1. Surface of rather well-preserved fragment. Pawpaw Point. x 16 Migs: (2-45 MEMBRANTIPORASBIROLIATAN NE CSDe sr iccicisc-1- clecieieieielnaiaimiclorietarienets 411 2. Dorsal face of one of the two layers of zooecia. Jones Wharf. x 16 8. Surface of young specimen. Same locality. x 16 4. Surface of an old specimen. Same locality. x 16 Big-3d:, MEMBRANTPORAYERISTUDAVON: (SDs) cecoreyets oroteust eran) susvevebaicleRenelia teeta tetete pete 413 5. The fragment upon which this species is founded. St. Mary’s River. X 32/5 Kies 6. ‘CUPUEABLA DENTICULATA (2) CConradi) aac) occ elets alates ersten 414 6. Portion of the surface of the specimen described. St. Mary’s River. X16 Figs. 7a; 7b. sAMPHIBEESTEUIE AGEED US My iSD: oc.) oes eeiate eleteterens everett 414 7a. One of several small patches of this species growing on Pecten madisonius. Cove Point. x 16 7b. A number of the zooecia of same in outline. x 34 BRYOZOA. MOLLUSCOIDEA PLATE CXIII. PAGE Migs, 1.24 Lmprarne (2) REVERSA IS SPs. sachs cre teneie aren neue oer ree anaes 426 1. Portion of one of several patches of this species, showing zooecia with thin raised borders. Cove Point. 16 2. Portion of another zoarium of which nearly all the zooecia are provided with ovicells. On Pecten madisonius. Same locality. OG Mig. 3) | MiCROPOREDUA. PRACCUEEATA, N., (SD! .. cus states aeacnate eravenaen nee ee deeareee ate 415 3. Portion of specimen not well preserved and somewhat doubtfully referred to this species. Ovicells are wanting. Jones Wharf. xX 16- Figs. 4, 5. ADEONELLOPSIS UMBILICATA (Lonsdale) ............ceeeeeeee 417 4. Portion of a mass of this species, showing zooecia in youthful stages of development. Petersburg, Virginia. x 16 5. Portion of another mass, showing zooecia in an advanced stage of development. Same locality. x 16 Migs! 6-85. MIircROPOREEDAS (2) BIROETATAN Ms SDs cierecrcuctarecsreielsueisralisieio eeensustetons 417 6. Surface of a fragment, illustrating appearance in young specimens. Cordova. X 16 7. Portion of another fragment having ovicells. Same locality. 16 8. Portion of a third piece from Cordova, showing adult appearance. x 16 105 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CxXill. MOLLUSCOIDEA—BRYOZOA. PLATE CXIV. PAGE Rie 1. \SCHIZOPORELEA SUBQUADEATAD MASP. sara )ateraiss7oln enue neta sonnet yeeros 420 1. Finely preserved specimen of this species. Governor Run. x5 Migs! 2-4." “SCHIzOPORBEGLA DWATISTN MATA (TL SSID yiern ate) aie lebalalelevoielste stochsieneenenenate 421 2. A patch of this species. Jones Wharf. x 82/5 3. Another patch from the same locality. x 32/5 4. One zooecium of same. Xx 24 Fig. 5. ADEONELLOPSIS UMBILICATA (Lonsdale) .............-..--.-.--- 417 5. Edge view of vertically fractured specimen, showing columnar structure produced by direct superposition of successive zooecia. Petersburg, Virginia. x 32/5 Figs 6-10. ScHIZOPORELLA INFORMATA (Lonsdale) .............---++++- 419 6. A strongly nodulated mass. 7. A portion of the surface of another specimen. x 16 8. Another portion of the same. x 16 9. A portion of the surface of a third specimen from Petersburg, Virginia, showing less regular arrangement of zooecia and, in the latter figure, remains of three of the large globular ovicells. x 16 10. Another portion of the same. eal 106 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXIV. MOLLUSCOIDEA—BRYOZOA. CXV. PAGE Mies M53 SRETEPORA DOVHRENSTIS: dea SDs wens svele o erarciocs) cionstereheieie ieee iatemerene rae raie ore 422 1. View of a small specimen. Dover Bridge. x % 2. Another specimen. Same locality. xX 4% 3. A third specimen. Same locality. x% 4. A fourth fragment without ovicells and with few large avicularia. The latter are present chiefly on the worn lower end of the specimen. x 32/5 5 A fifth piece from the same locality with numerous ovicells and avicularia. X 32/5 Migs: (6) 7.) AniPHIBEESTRUM CONSURICTUND M+ ISPs ac crercnreieterdioteickerteieneter rent 413 6. Portion of a patch of this species growing partly on one of the radial ribs and partly in a groove between the ribs of valve of Pecten madisonius. In the middle of the figure the prominent avicularia are shown in profile. Cove Point. x 16 7. A few zooecia showing normal form of same. x 16 Wigs 78a obs. 9s BPRAG TAA CTE ANAC TI. {Se afelele/sielelereteleieicieiel ctelcaterncrenaretalens 423 8a. A specimen growing, as usual, upon a small mollusk and having the surface elevations or ‘“‘ maculae”’ unusually well developed. Plum Point. xX % 8b. Portion of surface of same. x 32/5 9. Portion of surface of a larger mass from the same locality. X 32/5 107 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXV. MOLLUSCOIDEA—BRYOZOA. PLATE CXVI. PAGE Mie do (PALNIICEDLARTA. PUNCDATAy Mi iSDiit.rerleieicielorieleleineieicrsireteketsornemereretsre 428 1. View of the specimen described. Reed’s. x 16 Figs: 2-4." (PAUMICERLARTA” CONVOLUDA: Te (SDs i stemie ms sieleietete ciel isteleien ier eietelett 427 2. View of a specimen illustrating the mode of growth believed to characterize this species. Reed’s. x 46 3. View of a fragment. Same locality. x 16 4. Portion of another fragment showing several of the problematical closed cells. Same locality. «16 ise SeRPRATTA MON TEAE A) i SIP mici-sealclaveistenstetereieltetohaistelclet trek erernaieistere rete 424 5. The specimen upon which this species is founded. The photo- graphic base of the drawing was too dark to admit of bringing the elevation of the front of the zooecia into the relief shown by the original. St. Mary’s River. ale 108 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXVI. MOLLUSCOIDEA—BRYOZOA. PLATE CXVII. PAGE Fig. 1. SCHIZOPORELLA DOVERENSIS( Ti SPs cecal stern e ces etenednetereteta tienen 421 1. Portion of surface. Dover Bridge. x 16 Fig. 2: LLEPRADIA, MARYLANDICAGDSD:, ¢...2.<\cuiscsen'e iniseie On Ree 425 2. Portion of a patch growing on Pecten madisonius. Cove Point. x 16 Bigs) 3,4: SCELEEPORA, MASSAUGIS sls qSDisvcrvsavelsetereracieiee er cnercia ciemie cette ereons 428 8. Surface of an excellently preserved small mass. St. Mary’s River. x 32/5 4. Surface of another mass showing the usual appearance when worn. Greensboro. X 32/5 Wigs b> (65) (CeELEEPORAYCRIBROSA™ TEMS D)p- srct-Pekeieretorsietusienstoleh tereteate rere net 429 5. A small compressed mass. Reed’s. x 16 6. Outline figure of orifice. x 24 Fig: 7: SCHIZOPOREREA NCD MUGATA Ti) SDs (ie. nkrevareaieiets eve sslersceveltieia cee ater ale 422 7. Portion of the surface of the specimen described. Jones Wharf. xX 16 109 MIOCENE, PLATE CXVII. MARYLAND GEOLOGICAL SURVEY. MOLLUSCOIDEA—BRYOZOA. PLATE CXVIII. Migs! 1-45 || CRISINAMSTRIATOPORA Wy (SDL 0 seeseserarcyaiensverciene) stalevevcneue lel ete roven ceetotccesere 406 1. The specimen upon which the species is founded. Jones Wharf. x 21/4 2. Lateral view of one of the branches of the same specimen. x 23 3. Upper surface of the same. 7 4. View of the broken end of one of the branches of the same. og ly Figs, 5,6: SCHIZOPORELLA SUBQUADBATA, Th. SPs (eer cieie ole 10 cvs olele/eie eve ele) eiaya 420 5. Part of the specimen figured on Plate CXIV. LT 6. One zooecium of a specimen from Governor Run. x 1914 Wiss i.) WUbPRAT TAN MOACULATAG N= (SD elereclcvelel oetoieteieieesisterisietNeletcletci eter toketars 423 7. A small portion of the surface of one of the specimens figured on Plate CXV. The figure is intended to show the form of the orifice and the two kinds of avicularia. yy Migs sl '6s 77 MCELLEPORA (MASSALIS MM yi SDaliycteictetelore etlevetel stele rekensiatetereietetaters 428 16. Front view of a zooecium of the specimen figured on Plate CXVII, Fig. 3. St. Mary’s River. oe aly / 17. Profile view of the same. St. Mary’s River. X17 Miz. al 8) SPIRORBIS) CALVERTEN GIS IWS Deir rereloieveveivedsicterisieleterelesterelstetnetetciekenere 430 18. View of several individuals attached to the surface of a Twurri- tella. Plum Point. xX 3/2 110 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXVIII. MOLLUSCOIDEA—BRYOZOA, AND VERMES. PLATE CXIX. PAGE Figs. la, 1b, 1c. EcHINOCARDIUM ORTHONOTUM Conrad.................- 430 la. Lateral surface of test. Jones Wharf. 1b. Lower surface of same specimen. 1c. Upper surface of same specimen. Wiss 29287 (SCUUELTASABMRT I CONTAGH minstrels stole tstere cl cisisiarcnelclerexcteie iene tiskeke 432 2. Upper surface of test. Jones Wharf. 2a. Enlarged plate of same specimen. 111 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXIX. ECHINODERMATA, la. 1b. 2a. 2b. PLATE CXxX. PAGE igs: la-2b2 eSCULELEAy ABHETTs © OMTACs cyaters rere nisvelels cickelartcea einer csteteer steels 432 Lower surface of test. Jones Wharf. Lateral surface of test of same specimen. Interambulacral plate. Another view of the same (7). OPHIODERMA: i(-2))\ (SDs ~ ce \hestsays iovecs arene W175 al eco eis sreraveustn annie alepareiairereeorerenete 433 Fig. 3. 3. Fragment of arms. St. Mary’s River. 112 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXxX. ECHINODERMATA. PLATE CXXI. Migs! 1-95 HYDRA CTINTA MULTISPINOSAU Tes SDs ares ererercleletencietsrereners dnetenreterene rene ale The type specimen, growing, as usual, upon the shell of Poly- nices sp. and showing the average external appearance. U. S. National Museum. 2, 3. Two specimens showing extremes observed in number and size of surface spines. The latter possibly represent a distinct species or variety, approaching the BEuropean H. circum- vesticus (Wood). 4-7. Surface of four specimens showing slight variations partly due to preservation. x8 8, 9. Edge views of four pieces of two specimens showing interla- minar spaces and other characters very well. The solid lower portions of the two upper pieces represent the space of the absorbed shell replaced by nearly solid coral tissue. U. S. National Museum. Plum Point. x 8 igs 10: (MitrnaAst er DNCRUSTANS! De) Sen. seten SDierietere cleleliteialsltelererieirens 10. Surface of a specimen. U. S. National Museum. Plum Point. Figs. lla, 11b. MILLEASTER (?) SUBRAMOSUS N. SP. .......-.....---+.-> lla. The type specimen. Cove Point. 11b. Another view of the same. The large openings are of small barnacles partly covered by the hydrozoan. x4 113 PAGE 433 436 437 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXXI. COELENTERATA—HYDROZOA. PLATE *CXXII. Rigs. 1-3: °PARACYATHUS) VAUGHANDT (GANG) o7cfoarcjereta)e ate aol ala) */alelelelolelieteiselelel siete 438 1. View of several specimens attached to an _ oyster shell. Carter’s Landing, Virginia. xy 2. The cluster of three individuals more enlarged. 3. The largest individual represented in Fig. 1 more enlarged. The figured specimen in the collection of Johns Hopkins University. 1The following plates illustrating the corals are reproductions from photo- graphs. Mr. Levin C. Handy made the negatives; prints on velox paper were made by Mr. Norman W. Carkhuff of the U. S. Geological Survey. Miss Frances Wieser retouched some of the prints. 114 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXxXiIl. COELENTERATA—ANTHOZOA, PLATE CXXIII. Mies: 1-4) SAS TRH ETP ASP Am VEATHAN (GOLGI SS!) lunpetnet tetesetscelstanttenimedeteis iceorcronetare 439 1. The most normal specimen in the collection. The other specimens from the same locality show considerable fusion of the branches. David Kerr’s place, Talbot County, Maryland. Length 114 mm. 2. Palmate specimen. Choptank River. 14 to 14 mile below Parker’s Landing. Length 115 mm. 3. Specimen with coalescing branches. Patuxent Cliffs, St. Mary’s County. Greatest length 69 mm. 4. Young specimen. Plum Point. Greatest horizontal measurement 44 mm. All four specimens in the U. S. National Museum. 115 MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXxXIll. COELENTERATA—ANTHOZOA. PLATE CXXIV. PAGE Figs. 1-4. ASTRANGIA LINEATA (Conrady. (All figures from the same SPECHMENA)— weeperern hw svete: eyeete eee relic) cle uciel etotate teer eule Vane etabeatatate 495 BIDDULPHIA TESSELLATA (Greville). X 33314..............---: 495 Coscinopiscus APICULATUS Ehrenberg. X 3831%..........----- 503 CoscINODISCUS ASTEROIDES Truan and Witt. xX 3331¢.......... 504 CoscinopiscUS HETEROPORUS Ehrenberg. X 33344........-.--.- 505 COSCINODISCUS LEWISIANUS Greville. XX 333814%..............--- 505 126 MIOCENE, PLATE CXXXIV. MARYLAND GEOLOGICAL SURVEY. PLANTA—THALLOPHYTA, DIATOMACE#. ign ke Fig. 2. Fig. 3. Fig. 4. Fig. 5. Figs. 6, Miz. 18. Bien ed: Fig. 10. TEs alal Fig. 12. Fig. 13. PLATE CXXXV. PAGE COSCINODISCUS LINEATUS Ehrenberg. X 333%%...........200-:s 506 COSCINODISCUS PERFORATUS Ehrenberg. X 333%... ........... 506 CRASPEDODISCUS COSCINODISCUS Ehrenberg. X 333%5........ .. 500 CRASPEDODISCUS ELEGANS Ehrenberg. X 16636................. 501 DIPLONEIS MICROTATOS Var. CHRISTIANIT Cleve. X 333%%........ 487 . BUPODISCUS INCONSPIcUUS Rattray. X 383%... ...0. 0. ue cee we 498 GRAYA ARGONAUTA Grove and Brunt, xX s33tgmeceue ee eee 496 PARATTAISULCATA (Ehrenbere) Cleves 338565... sa. ee 491 PSEUDAULISCUS: SPINOSUS (Christian), < 33396....-..seeune ee 497 RHAPHONEIS GEMMIFERA Bhrenberg. X 333%4.............+0-. 488 SCEPTRONEIS CADUCEUS Ehrenberg. X 333%4.................-- 489 STEPHANOPYXIS CORONA (Ehrenberg). X 333%...............- 490 127 MIOCENE, PLATE CXXXvV. MARYLAND GEOLOGICAL SURVEY. ecetseaees peeeeaesestica: SATE AOA tH PLANT—THALLOPHYTA, DIATOMACEZ, RO A ean M i Ri! — Ein SMITHSONIAN INSTITUTION LIBRARIES