Full text of "Miocene"
MARYLAND
GEOLOGICAL SURVEY
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MIOCENE -
PLATES
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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= <ioreraeiererere crevice eteienseieretee
6. Lumbar vertebra, lower view. Charles County near the Patuxent
River. Acad. Nat. Sci., Phila. xX 2%
Figs. 7, 8. PRISCODELPHINUS RUSCHENBERGERI Cope..............--2+-+>
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). :
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MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XVI.
MAMMALIA,
PLATE XVII.
Biesnds 28 DEEPER ODONMMEMN TO! CODE rye s.ec-te tales atctoy a mtaieesy serena s eerertnaherenenene
1. Anterior tooth. Charles County near the Patuxent River. Acad.
Nat. Sci., Phila. x %
2. Anterior tooth. Same locality and collection. x %
Figs: 3-5. (DEEPHENODON! TEIDYEMELAY: < s.cyec « accrs oc crannies oer nieen ere lore
3. Anterior tooth. Charles County near the Patuxent River. Acad.
Nat. Sci., Phila. x%
4. Anterior tooth. Same locality and collection. x 2%
5. Anterior tooth. Virginia. Acad. Nat. Sci., Phila. x %
r
= ys Soon we ree)
6a. Upper view of skull. Drum Point. Johns Hopkins University.
< Ye
6b. Lower view of the same skull. xy,
Biz}, (ORYGTEROCETUSKCROCODEEENUS) (G2) CODE! a. cece citer tees
7. Anterior tooth. Charles County near the Patuxent River. Acad.
Nat. Sci., Phila.
PAGE
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XvVIil.
° FZ ——— = EE EE
=?
MAMMALIA.
PLATE XVIII.
Figs. 1-2b. MmTorpoceTUS DURINASUS Cope ..........-+.-++++eee+-+eeess 3
1. Upper view of skull. Near the mouth of the Potomac River.
Museum of the Woman’s College of Baltimore. xy
So., Supraoccipital bone; Sq., Squamosal; Z., Zyzmatic; P., Parie-
tal; F., Frontal; N., Nasal; Na., External nares; 7. R., Tem-
poral Ridge.
2a. Anterior view of atlas vertebra. Same locality and collection.
x
2b. Upper view of the same specimen. x%
10
MIOCENE, PLATE XVIII.
MARYLAND GEOLOGICAL SURVEY.
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MAMMALIA.
PLATE XIX.
Hig 1. ‘CEPHATOTROPIS; CORONATUSs CODE mere) -tepeteneiiesresaiehaledctepar -bal ateyatek clever terete 39
1. Upper view of skull. Johns Hopkins University. x 144
So., Supraoccipital bone; P., Parietal; N., Nasal; Mz., Maxillary;
Pmz., Premaxillary; 7.R., Temporal Ridge.
11
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XIX.
tis 7
Na oorat
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MAMMALIA.
PLATE XX.
PAGE
Fig. 1. CETEOTHERIUM MEGATORIEVS UMM OO Dre se asec mcis acverereiyesretstoncialeys 41
1. Upper view of skull. Cove Point. Johns Hopkins University.
x%
So., Supraoccipital bone; Sq., Squamosal; P., Parietal; F., Frontal;
N., Nasal; Mz., Maxillary.
12
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE Xx.
MAMMALIA.
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PLATE XXI.
Higeds, (CeTvOrHERITM, GHEHAT UM COMO waryoreuso laters cieneeoistenetaak=tetap tered state tea
1. Humerus of right side. Shore of Ceeeebeeed Bay. Johns Her
kins University. .
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MIOCENE, PLATE XxXI.
MARYLAND GEOLOGICAL SURVEY.
BFMwA Ne
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SASSAS SALAS UNC z NNEC SRT SAINTS AINE
; SERRE NESE NIN SOS
MAMMALIA.
PLATE XXII.
Migshdia-2b:) CaToreERrUnicne me snunt CONC jeriss dele silt -tisleiciemsietcis ctsiete
la. Vertebra. Charles County near the Patuxent River. Acad. Nat.
Sci., Phila. x %
1b. Another view of the same vertebra. x %
2a, Another vertebra. Same locality and collection. x %
2b. Another view of the same vertebra. Dai ae
:
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MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XxXIl.
MAMMALIA.
PLATE XXIII.
PAGE
1p Py (Oh ouucanapopiencomscUrenin (Cols) gan oooobaceon Goonopacceccosoe 44
1. Restoration, one-fiftieth natural size. The shaded portions are
the actual specimen of one individual. Charles County near
the Patuxent River, now in the Academy of Natural Sciences of
Philadelphia. (After Cope, Amer. Nat., Vol. XXIV, Pl. XXII.)
Fig. 2. SKELETON oF PLALARUSLA, minus the fore limbs................. 44
Pp - ANN ea
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MARYLAND GEOLOGICAL SURVEY.
MIOCENE, PLATE Xxill.
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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<leKehaletseletsteteyels 45
8. Section of left mandibular ramus. After Cope, Proc. Amer. Philos.
Soc., Vol. XXXIV, Pl. VI, Fig. 5. xy
Fig. 4. SIPHONOCETUS CLARKEANUS COpDe ......0.sccescc ence reser ersves 47
4. Section of left mandibular ramus. After Cope, Proc. Amer. Philos.
Soc., Vol. XXXIV, Pl. VI, Fig. 4. x
Rigid. (SIPHONOCERUS: PRISCUS SL@IGY: ca.c 1. sescicuaserasaseyore ona acerecetenehererenadstsvecenetetecatre 46
5. Section of left mandibular ramus. After Cope, Proc. Amer. Philos.
Soc., Vol. XXXIV, Pl. VI, Fig. 3. x4
Hig:-(6.. WiGrAS = MoORATUIS: (COP ssa is contis erovloys cias oelererteys » ale eichors els etoreters 50
6. Section of left mandibular ramus. After Cope, Proc. Amer. Philos.
Soc., Vol. XXXIV, Pl. VI, Fig. 1. x
Hig v. (CeLOrEeERTUM, POLYPORUNE «CODE in silcleiere cienielniecxcelcisvereieiensretericisineis 47
7. Section of left mandibular ramus. After Cope, Proc. Amer. Philos.
Soc., Vol. XXXIV, Pl. VI, Fig. 7. xX
Mie es. CETOTHER TUM CHPEAT UM CODE ciicie sire cntelclelelareneleteiseaienalersterelsnatsnets 44
8. Section of mandibular ramus from Maryland, distal of the middle.
After Cope, Proc. Amer. Philos. Soc., Vol. XXXV, Pl. XII, Fig.
3. xl
Fig: 9. RHEGNOPSIS PALABATLANTICUS Leidy .......0.cen.ece ss eeereee 45, 46
9. Section of mandibular ramus from Virginia. After Cope, Proc.
Amer. Philos. Soc., Vol. XXXV, Pl. XII, Fig. 5. x
Mig 105 (CxroraERiUNn LEPTOCENTRUN) COME, ae aeieieeis cele ene teenies 47
10. Section of mandibular ramus from Virginia. After Cope, Proc.
Amer. Philos. Soc., Vol. XXXV, Pl. XII, Fig. 1. x
Big. ICETOTRERIUM DAVIDSONED (CODGS is aeeys tin ele creteneeeretaeyonietercie nein ererare 34
11. Section of mandibular ramus from California. After Cope, Proc.
Amer. Philos. Soc., Vol. XXXV, Pl. XII, Fig. 4. x
Higs12) > 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.
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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
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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))<i-1-1a cic n eieietoreieiesiereiin
2a. Outer face of a small tooth. Plum Point. x 4/3
2b. Inner face of the same specimen. x 4/3
3. Outer face of a somewhat worn tooth, the lateral denticles broken
away. Plum Point.
Fig. 4. OXyRHINA DESORII Agassiz
4. Inner face of a moderate-sized tooth. Charles County near the
Patuxent River. Acad. Nat. Sci., Phila.
Hizs:0a-6C) sOXVRHINA TAS TALIS PAIPASSIZ 1c )-ta sees Cretineisie eric eine eiore
5a. Inner face of a medium-sized and somewhat worn specimen.
Flag Pond.
5b. Outer face of the same specimen.
6a. Outer face of a large-sized lateral tooth. Jones Wharf.
6b. Profile of the same specimen.
6c. Inner face of the same specimen.
Higa. ‘OXYRAINAD STLEIMANT GibDES) weicetctekcrcirredottevers chaleioraeteteeroe eee
7. Outer face of an average-sized tooth. Fairhaven.
Mies; 8,595. (OToDUSOBLIQUUSPA LASSI Zastava ieee Seer
8. Inner face of a small-sized specimen with erect crown. Charles
County near the Patuxent River. Acad. Nat. Sci., Phila.
9. Inner face of a small-sized lateral tooth with oblique crown.
Charles County near the Patuxent River. Acad. Nat. Sci.,
Phila.
tw
79
79
80
81
82
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXX.
PISCES.
PLATE XXXI.
Figs. la-3. CARCHARODON MEGALODON (Charlesworth) .................. 82
la. Inner face of an anterior tooth with slender, erect crown. Plum
Point.
1b. Profile of the same specimen.
ie. Outer face of the same specimen.
2. Inner face of a small-sized, slightly worn specimen within thin,
flat crown of the variety styled “ C. productus Agassiz.”’ Plum
Point.
3. Inner face of a large-sized lateral tooth. Fairhaven.
‘Figs. 4a, 4b. VERTEBRAL CENTRUM OF CARCHARODON SDP. ............-..-- 82
4a. Vertebral face. Plum Point.
4b. Hemal aspect of the same specimen.
MIOCENE, PLATE XXX}.
MARYLAND GEOLOGICAL SURVEY.
PISCES.
PLATE XXXII.
Fig. 1. CARcCHARIAS (PRIONODON) EGERTONI (Agassiz) ...............-.
1. Inner face of a well-preserved specimen of average size. Charles County
near the Patuxent River. Acad. Nat. Sci., Phila.
Kigs2.- CARCHARIASSLAEVISSIM US) (COPE) imacic cle soleil ec icietoetaiettoe titre
2. Inner face of a tooth. Fairhaven.
Figs. 3-5. ‘CARCHARIAS COLLATA m. Sp. (Hix. Cope MS)! Socm-oe-. sense
3a. Outer face of a posterior tooth with expanded root. (Type specimen.)
Charles County near the Patuxent River. Acad. Nat. Sci., Phila.
3b. Inner face of the same specimen.
4a, Outer face of a large-sized tooth with erect crown and sharp lateral carinex.
(Type specimen.) Acad. Nat. Sci., Phila.
4b. Inner face of the same specimen.
5. Inner face of an average-sized tooth with prominent root. (Type speci-
et) Charles County near the Patuxent River. Acad. Nat. Sci.,
*hila.
Bigs: 6, 0.0 CARCHAREAS SMLAGIIA: (OPE) + Suess circuses: he dure leveruievetetesaete mania toetene f
6a. Outer face of a specimen with narrow root. Charles County near the
Patuxent River. Acad. Nat. Sci., Phila.
6b. Inner face of the same specimen.
7a. Outer face of a large-sized lateral tooth. with oblique crown and faint
crimping of its basal edges. Charles County near the Patuxent River.
Acad. Nat. Sci., Phila.
Tb. Inner face of the same specimen.
Fig. 8. CARCHARIAS INCIDENS N. Sp..
8. Inner face of the type specimen. Chesapeake Beach.
Migs: 9a, 9b: (GALEOCHERDO: CONTORTUS) GiDDeOS. ©. ccc cscs we «stereo ele shervaekerere
9a. Outer face of a specimen slightly above the average size. Fairhaven.
9b. Inner face of the same specimen.
Fig. 10. GALEOCERDO LATIDENS Agassiz...
10. Inner face of an average-sized tooth. Charles County near the Patuxent
River. Acad. Nat. Sci., Phila.
Big, 11.) -GAEOCERBDOSADUNCUS! AZASSIZ) 510 <crscaie eters varaye ists clara) Srayararereyerenerene renee
11. Inner face of an averaged-sized tooth. Plum Point.
His: 12)) (GanROCERDOMPRIQUETER: Wt SPsyc<icjcle rerecctsistelers s/s vahelevsle enleae rare ayerctotatnrs
12. Inner face of the type and only known specimen. Charles County near
the Patuxent River, Acad. Nat. Sci., Phila.
Kies. 413; 4: FTEMIPRISTISNSERRA (A SARSIZ 15 Saint sishe siclecve ete ele malate errtene caste ae
18a. Outer face of a medium-sized anterior tooth. Popes Creek.
13b. Inner face of the same specimen.
14a, Outer face of a moderate-sized lateral tooth. Popes Creek.
14b. Profile of the same specimen.
14c. Inner face of the same specimen.
Bigs 16 SPEYRNA WPRISGAL AS ASS Zier csyorheretste crc tivverehokciatevelereteReol Wereteron crepes
15. Inner face of a large-sized, perfectly preserved specimen. Plum Point.
Rig. 16. SPHWRASNA SPECIOSA, TOT yi Mei. ous cteis crete ivelsve aos 42-0! eleietesereratacs mettre
16. Crown of fragmentary laniary tooth. Charles County near the Patuxent
River. Acad. Nat. Sci., Phila.
Higs: 17-19.. “Orotares of; Weleost: Wishes og sewers save ccs cuter evheeeierene
Inner, outer and side-views of otolites. St. Mary’s River. x %%
PAGE
84
85
86
87
87
88
88
89
90
91
92
93
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXXII.
PISCES.
PLATE XXXIII.
PAGE
Hiss) 1-6.) SB ADANTIS CON GAVUIS mE TOW alec) el cisieretolerciels eiedalcienlererieien ysis eiaieiiers 94
Lateral view of large specimen. Jones Wharf.
. Scuta and terga. St. Mary’s River.
. Lateral view of the same.
. Exterior of left scutum.
. Interior of the same.
. Interior of right scutum.
. Exterior of the same.
. Exterior of right tergum.
. Interior of the same.
. Exterior of left tergum.
. Interior of the same.
‘MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXxXill.
ARTHROPODA—CIRRIPEDIA.,
PLATE XXXIV.
Mize a=i-) BAAN S! CONGAVUS VBL OWiluesrsrelsieleleleroerercneieuarereiciet-cersteterslereicteteisters 94
1.
“1D Of P CO bo
Interior of left lateral compartment of original of Plate XXXIII,
Fig. 1.
. Interior of rostrum of the same.
. Interior of right lateral compartment of the same.
. Interior of right carino-lateral compartment of the same.
. Interior of carina of the same.
. Interior of left carino-lateral compartment of the same.
. Basis of the same.
26
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXXIV.
fi My Jana ” ¥
Hi} LAS
CAA A Cit Sean
th i. HHO aa ‘
ARTHROPODA—CIRRIPEDIA.
PLATE XXXV.
Wigs: 1-110) (CYPHER) CLARKANA MSD iy. cf ceercictelelccracnats cleseceloletateretetsine tenets 98
1. Rather short left valve. Plum Point. U. S. Nat. Museum.
. A left valve of the average length and dimensions. Same locality.
. Unusually elongate right valve. Same locality.
. Rather short right valve, without spines on either end. Same
. locality.
. Dorsal view of a large specimen. Same.
. Right side of entire carapace differing slightly in outline from
the usual form.
7. Dorsal view of another specimen.
8. Ventral view of a specimen, broken to show overlap of edges.
9. A small and somewhat macerated left valve.
10. Interior of a short right valve.
Hm Co bo
a oO
Figs. 11-14. CyTHERE CLARKANA V&al. MINUSCULA Tl. VaPr..-.. 60... ee recs 99
11, 12. Two left valves of this variety.
UB A right valve, somewhat doubtfully referred to this variety.
14. Interior of the largest left valve seen.
Mies b=. (CYPEERE -INIANQ UEVATA VISE Me SINS are a-c ersicte tei cclasseseel synlelnpevanmate aeenwiets 101
15. The left or larger valve. Plum Point.
16. The smaller and quite differently shaped right valve. Same
locality.
17. Interior of another right valve.
Migs, 189) “Cy PORE PLEBETA Vale MODIGAS Tavis ess cree + le kena) eiey hel menststenene 103
18, 19. Two left valves of this variety differing somewhat in outline.
Plum Point.
Mess 20-29) VCP MERE PROBELA. Ms ISDE erasieltbetscrteysl(e selloyerotcicrala/ ove iatenteneatat 102
20: Ventral view of two valves partly opened.
21, Right side of an entire carapace of average form and dimen-
sions, showing inequality of valves.
22 Left valve of the usual form.
23-25. Three entire specimens figured to show respectively dorsal,
ventral and dorsal edges.
26, 27. Two views of an unusually wide left valve.
28. A similar left valve having a well developed border along the
anterior edge.
29. Interior of another left valve like Fig. 28.
Figs. 30-83. CyYTHERE PLEBEIA Var. CAPAX TD. Val..... 1.2.2. ee eee e esse ene 103
30. Left valve of this variety, showing relatively shorter form and
finer surface punctation that distinguishes it from the
typical variety of the species. Plum Point.
1,32. Two right valves. Plum Point.
3 Interior of another right valve. Plum Point.
The figures on this plate are all magnified 20 diameters and the specimens
are all from the Calvert formation at Plum Point, Md.
)
a
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXXV.
31
ARTHROPODA—OSTRACODA,
PLATE XXXVI.
Migs. 1-5. 0 CYTHERE EXANTHEMATA HG SSDietcce ncisteree useless are crc 117
i, Right valve of a young individual, with the nodes but little
developed.
2, 3. Left valves of two older individuals, showing the usual
characters.
4, Largest right valve seen.
5: Interior of right valve.
Bigs::6:8. 4 CY@LUERE) BVA A1,, SP Peysrerenseucn tole seks elev ous oelenenehe sete ketene oer erences 16LS)
6. Rather short right valve.
7. Left valve.
8. Another right valve.
Migss9) 10s ICynnERneMVAuval. OBLONG AM Ans avail mele rsielcus screen meienene enemas 119
9. Right valve. Plum Point.
10. Left valve with surface ornament obsolescent probably due to
age.
Migs W-15.) «Cyr eERe MARTINA. SDs Vota cicn ner seeveverakeleracrmieraie eneteuatets teers 112
11-13. Three right valves showing slight differences in ornament and
outline.
14. Left side of an entire carapace, tilted slightly so as to show the
dorsum of the opposite valve.
15. Left valve of a variety differing from the typical form of the
species in the surface ornament and in being a little
shorter.
Mes 6. “Cy tere P DORSTCORNTISiNeMSID: | sr iecsharerehe citichoeacest ere cacao tote enor 116
16. The left valve upon which this variety is founded. Plum Point.
Bigs 17% UCVTRHERE SPRODUGDAUSMOSS'D. “stevsicss avencuerenenecersaspenesefeceie cealeley seein eee 115
17. A left valve showing the unusual posterior extension charac-
terizing this species. In other specimens believed to be of this
species the posterior end is wider. Plum Point.
Bigs! 182200 LO MERE VelCUL/ AN dle SDs steve sie eu sete aleler oveneler states ieiteiene nies raat 116
18. A small left valve. Plum Point.
19. A large right valve.
20. Another left valve. The left valve has minute spines on the
anterior and posterior horders that are scarcely visible at this
magnification.
Migs!) 21-235 9 CyCHpRE EN CELD UAMeIs (SD)aiuer-cartaieierteteteneieuctcisyeveneel-teloncnelon tiene 107
21, 22. Two left valves showing slight differences in outline. Plum
Point.
Da The interior of a third left valve showing that the anterior
tooth of the hinge is very faintly developed in this species.
Only a tooth socket is distinguishable at the posterior
extremity.
Figs. 24, 25. CyTHERE NITIDULA Var. CALVERTENSIS MN. Var...........+-- 108
24. A left valve of this variety or species.
25. A right valve referred to this variety or species with some doubt.
Migs. 26-33. \CYTEERE, PORCHEDUA: Ts SD!o so cisieus sicie rele eielerelteie) ers tlalelelshetonoeite 106
26, 27. Two left valves of the form regarded as typical for the species.
Plum Point.
28. Another left valve differing slightly in shape and probably
somewhat macerated.
29. Inner side of fourth left valve.
30. A right valve.
31. A left valve somewhat doubtfully referred to this species and
possibly indicating a distinguishable variety.
32: A more ovate left valve that also might be distinguished.
aR}, Interior of a right valve of the normal form.
Miesy 634-39. {Cymer Ee CRURNSi WAS Ds yerars cletevcis ayeheyetele) sie! «cea coke) aisheta renee tene 103
34. A well-preserved right valve.
35. A smaller and apparently macerated right valve.
36. Interior of a right valve.
37. A large and unusually well-preserved left valve.
38. Another left valve on which the longitudinal striation is obsolete.
39. Interior of a left valve.
The figures on this plate are al! magnified 20 diameters and the specimens
are all from the Calvert formation at Plum Point, Md.
28
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXXVI.
e IAL IL
3 “}
ARTHROPODA—OSTRACODA,
PLATE XXXVII.
Figs. 1-8. CyQTHERIDEA SUBOVATA DT. SD......--. eee tee eee ee eee eee eee 124
aly A right valve doubtfully referred to this species. The posterior
outline is more uniformly rounded and the central portion of
the surface more peaked than usual. Plum Point.
2, 3. Interior of a left valve of the normal form x 37 and x 20.
4, 5. Two left valves of a narrow variety.
6. Dorsal edge of a typical specimen.
7, 8. Interior of a right valve of the typical form x 37 and x 20.
Fig. 9. CyYTHERIDEA (?) CHESAPEAKENSIS 0. SP.....---------+e see eeeees 125
9. A right valve of this species. Plum Point.
Figs. 10-16. CyTHERIDEIS ASHERMANI 0. SP. ..------- ee eee eee eee eee ee 126
10. Rather large left valve. Surface pitting indistinct. Plum
Point.
ily A small right valve.
12, 18. Two small left valves.
14. Interior of a large right valve.
ily Dorsal aspect of an entire carapace tilted so as to show
more of the left valve than of the right.
16. A left valve differing from the usual form in being relatively
a little longer and in having the posterior outline less nar-
rowly rounded.
IMS ale (pdusnjpi ie) Cyan WON oe hooan pcos sco ol soca sao6ose S500 126
17. A left valve. Plum Point.
Migs, 18-20) (CvTRERIDEIS SEMICIRCULARIS! Ml. GSD). cries <0s cteinals ele -oa ei sesreneve ens 127
18. An entire carapace from the right side but tilted so as to show
the dorsal edge of the left valve, the central part of which is
really overlapped by the dorsal edge of the right valve.
19. Ventral view of another entire specimen showing that here the
left valve slightly overlaps the right.
20. A right valve showing usual outline and surface markings.
Migs. 21-202 iCy ME eRID RIS ON GULAM SDis cre sisccats crteroteicie steve metstet raster tenes 128
21-23. Three right valves showing unimportant variations in outline
and surface ornament.
24. Ventral edge of an entire carapace.
25. A left valve.
26. A right valve, doubtfully referred to this species.
PAT Interior of left valve of typical form. The pits on the sur-
face of this valve are about as in figure 22 but more dis-
tinctly impressed.
Fig; 28: (Cx THERIDEISSSUBAOUALIS MSDS cicteic sas sla etercas eeeeuens = itera anaes 127
28. A specimen preserving both valves showing the right side but
tilted slightly to expose the ventral overlap of the left valve.
The rounded holes in each end are the work of some boring
mollusk or other organism. Plum Point.
Figs. 29-33. CyTHEREIS CORNUTA Var. AMERICANA DN. Var..............-. 122
29. Dorsal view of a left valve.
20-32. Three left valves showing the extremes of variation observed
in the Maryland specimens.
38% A right valve.
Excepting Figs. 2 and 7, all the figures on this plate are magnified 20
diameters. The specimens are all from the Calvert formation at Plum
Point, Md.
29
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXXVII.
32
ARTHROPODA—OSTRACODA,
PLATE XXXVIII.
PAGE
Hiesiel=35) (CY THERE PEANTBAS ATS OTM SD aenieriycuctssieccherclerenersenherteterermeretoretae 99
1. Lateral view of a right valve. James River, Virginia.
2. Posterior view of the same. James River, Virginia.
3. Ventral view of the same. James River, Virginia.
Mies! 4-65 CyPTRERE, TUOMEVT MSD: cyte ayes) sccisrcicielcieye che bekereyetenmt lena) stetatate totes 105
4. Lateral view of a left valve . Yorktown, Va.
5, 6. Lateral views of a right valve X 254% and x 131%, apparently of the same
species. Peach Blossom Creek, 3 miles southwest of Easton.
Bigs, 7-9. CYQTHERE PAUCIPUNCTATA Tl. SD), sec sc. cen eee
ie Lateral view of a left valve. Peach Blossom Creek.
8, 9. Posterior and ventral views of same in outline.
Ines aS (Cranenaay (C7) shee Nemoore 1b El9, coaoocddcboudoDodoooboogDDOKODS 121
10. Lateral view of a left valve. Pawpaw Point.
Rigs rehtatol) CVU ERE CARVER TT: 1. SDs mene aieitraleae nny cenaie is acsteereneear sete ten otis 100
11-18. Lateral, anterior and ventral views of a left valve. Plum Point.
Migs: 14-15: (CyTHERE SUBOVATMAS eM SDae.tertciyecisselcratelcreseeteyereteketer nie torensiensiie 111
14, 15. Lateral and ventral views of a left valve. Pawpaw Point.
Mizse6: dive CYTHMERE RUGIPUNGTATA™ MS Dixy <teycisicrerelstekelstelsvetelatete er lerielonatrene 118
16, 17. Lateral and dorsal views of a left valve. James River, Virginia.
Ric ess \CYTHERE (SP UNGER AT AL I Silence steysserert letetarsie) aredetcueotereinie oats anton ae 120
18. Lateral view of a right valve. Plum Point.
Biss 19-245 Cy MHERE RAN CIS CAINS IS Die ecelalereteveuereretetlalottatestelatsleaactel strat tater 110
19, 20. Two lateral views of a right valve * 2544 and * 1315. Peach Blossom
Creek.
ale Ventral view of same.
Bess 22-24.) (Cx DAERE) PUNCTISLRDEA TACT S Dei rcretanersieloncierelctotelsreuetsteiayateyemaraterensta 108
22, 23. Lateral and ventral views of a right valve. Peach Blossom Creek.
24. Lateral view of a left valve, differing slightly from the type specimen.
Church Hill.
Lt YA pe Op Gs Mew USO Gh (105, aoosnaneqaonoddar ooaoeronogon ot 109
7. Lateral, posterior and ventral views of a right valve. James River,
Virginia.
Figs. 28-30. CyTHERE PRODUCTA n. sp. (See also Plate XXXVI).......... 115
28, 29. Lateral and ventral views of a right valve. Plum Point.
350. Well-preserved right valve differing slightly in surface markings.
Plum Point.
Higa sis) Cy THERM GENE NEG AU SE ete SD pettacalevel eletet rele Kel bela ieleyelstatelatet ofeteletal l= 114
31. Lateral view of a left valve. Plum Point.
Figs. 32, 38. CyTHERE DORSICORNIS BICORNIS 0. Sp. et var................ 114
32, 33. Two lateral views of a left valve xX 13% and X 254%. Pawpaw Point.
IME BE, (Chdausonnais, eNoSy i (pos soo gonadaaodondnbosoooocaodon Gonos 123
34-36. Lateral, posterior and dorsal views of a left valve. James River,
Virginia.
Figs. 37-40. CyYTHEROPTERON NODOSUM D. SP. ..........cceeeeeerececeees 129
37-40. Two lateral, a ventral and a posterior view of a right valve x 2544 and
x 18%. James River, Virginia.
Unless stated otherwise all the figures on this plate are magnified 13% times.
30
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXXVIII.
38
ARTHROPODA—OSTRACODA,
PLATE XXXIX.
ie A NAUTILUS! BD ve o:d's,acs ereveronchevarsateusca ele: aielaneiecs avese eral erent delle tere/ekebenoeatene eons 130
1. View of exterior of peripheral portion of a septum. Plum Point.
Cornell University.
Migs) ACTAON OVOIDES {COMTAGY ayaclars.cxccciare oejeie cusieienels eroleren hele ol stanetomeierereiete 131
2. Ventral view. Cove Point.
Mieev3. AcrAon -PUSTEDUS WHOrDESI)) ye rtesreye oyeuctete toleretelanetaare coe eon mete ene 132
38. Ventral view. St. Mary’s River.
Kig.t4., JACTmON SHILOBENSIS) WihiCfeld es cicvterectesclevoicrat severe oleisce el reietene eters 132
4. Ventral view. Cove Point.
Big. “ACTASON GALVERTENSISs ISPs ce.) esebeusltenscer-isneierotcveereraucheneierenctcamneustenetene 13:
5. Ventral view. Plum Point. Cornell University.
Fig. 6. Voivuna tora (Conrad) var. MARYLANDICA 0. Var.............-- 134
6. Ventral view. Cove Point.
Hiei VOLVULA TODA) (Conrad) wvare DEMUN UTA aren vielirrerel-cileterdersrotenicneteneione 134
7. Ventral view. Cove Point.
Mies § VOLVULA Tora. (Conrad)! var. CAGVERTA Dy Var acc. oe cies 135
8. Ventral view. Plum Point.
Bigs 9: \VorvuLva 1oray (Conrad) var: PATUXENTIA Nl Vats. en. sms <a «creme 135
9. Ventral view. Jones Wharf.
Bigs10) Renosa ((CybiGHigrNass)) MARYEANDICAUS SD aercieyiel-icereaieteie richie 135
10. Ventral view. St. Mary’s River.
Wig. 11. Rerusa (CYLICHNINA) CONULUS (Deshayes)................... 136
11. Ventral view. Plum Point.
Hisi2. REerosa (CyricuninA)) SUBSPISSA (Conrad)! aaeiccm scum cena 136
12. Ventral view of type. Calvert Cliffs. Acad. Nat. Sci., Phila.
Migsals. CyticHwa, (62) (GREENSBOROENSISH (Sptreeciicicia cles ree ci chele eislenetete 137
13. Ventral view. Greensboro.
Biss) 14 tb.) VC ymiCHNANCAL VER TEN SIS mils 4S Dlsrape telcos aelstonsiecsialsnaietstsloteretetoterene ies
14. Ventral view. Plum Point.
15. Ventral view of less elongate specimen. Same locality.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XXXIX.
MOLLUSCA—CEPHALOPODA AND GASTROPODA.
PLATE XL.
Bigs. 1,22) UDEREBRA SUNTLE NEAT AMO OULEG) cr i,5 creer eters cies clavets a ieinisl neleietene tere 138
1. Ventral view of fragment. Plum Point.
2. Ventral view. Duplin County, North Carolina.
Figs. 3, 4. TEREBRA (ACUS) CURVILINEATA Dall var. WHITFIELDI n. var.139, 140
3. View of one of the types of 7. curvilineata Whitfield. Jericho,
New Jersey. U.S. National Museum.
4. Ventral view. Plum Point.
Fig. 5. TErREBRA (ACUS)CURVILINEATA Dall var. DALLI nl. var......... 139, 140
5. Ventral view. Greensboro.
5
Figs. 6, 7. TEREBRA (ACUS) CURVILINEATA Dall var. CALVERTENSIS 0.
Af) earns Ara icI Se RATS CISTI RoC ORE Om Clomicoa Cocmin noes 139, 141
6. View of fragment showing typical sculpture. Plum Point.
7. Ventral view of more complete specimen. Same locality.
Pig: 8) TeREera. CAcCuS)McuRvinmsAraAs Conradi scm aec oeaiereie acct etree 141
8. Ventral view. St. Mary’s River.
Hie. 19S “PEREBRANICA CUS) SENCERA: (i) alliiamr co. ciarascinyctalctouete ehenonstereeneas cheraraieeetete 142
9. Ventral view of type. St. Mary’s River. U.S. National Museum.
IMF Ub (ERY) havin <(Coune Glo annconcoduonosogouasobas 1438
10. Ventral view. St. Mary’s River.
Fig. 11. Trresra (HASTULA) SIMPLEX Conrad var. SUBLIRATA Conrad... 144
11. Ventral view. St. Mary’s River.
Migs! 12) 03) Teresa, CHASTULA)) INORNATA Wihithield.........cc.n vein 144
12. Ventral view of a small specimen. St. Mary’s River.
13. Same view of a larger specimen showing revolving striae. Same
locality.
Migs 14. “TEREBRA ((EVASTULA)|NPARUDEEN TYAN I (SDhs, cnc: oa-crerelerenae als avete erevelenene 145
14. Ventral view. Jones Wharf.
igs 15-17. \Conus MIE UVPANS GROOM 1.1. ata telsreie res ouealeteleasisreoiatelolerensiareiets 145
15. Ventral view of large specimen. St. Mary’s River.
16. Ventral view of young individual. Same locality.
17. Ventral view of abnormal specimen. Same locality. Cornell
University.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XL.
MOLLUSCA
GASTROPODA.
PLATE XLI.
PAGE
Fig. 1. PreuroroMA (HEMIPLEUROTOMA) ALBIDA Perry...............-- 146
1. Ventral view. Jones Wharf.
Figs. 2, 3. PreurotoMa (HEMIPLEUROTOMA) COMMUNIS Conrad.......... 147
2. Ventral view of adult individual. Cove Point.
3. Ventral view of young individual. Same locality.
Figs. 4-6. PLeuroToMA (HEMIPLEUROTOMA) COMMUNIS Conrad var. PRO-
TOCOM MUMMIES? TL VAR (lar vaccia cierto ane secratent iste tater neces ate ecient relates tote ans 147
4. Ventral view. Plum Point. Cornell University.
5. Ventral view of larger specimen. Same locality.
6. Dorsal view of young individual. Same locality.
Fig. 7. PLeuROoTOMA (HEMIPLEUROTOMA) CHOPTANKENSIS DN. Sp. ......... 148
7. Ventral view. Jones Wharf.
Figs. 8, 9. PreuroToMA (HEMIPLEUROTOMA) BELLACRENATA Conrad...... 148
8. Ventral view of adult individual. Plum Point.
9. Ventral view of young. Same locality. Cornell University.
Figs. 10, 11. PrLeuroromMaA (HEMIPLEUROTOMA) CALVERTENSIS 0. SDp....... 149
10. Ventral view. Plum Point.
11. Ventral view showing the other extreme in sculpture. Same
locality. U. S. National Museum.
Migsiel2an Abie eSURCURAURUGATAN CONTACMHer at oem teeter aiiaeienian 149
12a. Ventral view. Jones Wharf.
12b. Dorsal view of same specimen.
Migs 13s VSURCULAS MARYUANDICA. COnradum-nienie nec acer 150
18. Ventral view. Plum Point.
Hip 4 ee SURCULAYBISCATEIVAR TAU CONTEC emer a eer eae eerste isl
14. Ventral view. St. Mary’s River.
Migi5> |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, <DRIELTACALVERTENSIS( 1s) SDin\aieisisielele si~ aintcrsterein alevelsiefeleieisietale eich 158
11. Specimen from Plum Point. U.S. National Museum.
Wigs; 125 13) GOED IAy TmNTA TTA CONTAC iis) -)elellelalelererslareictelaielslersialetaten- fats 158
12. Ventral view. St. Mary’s River.
13. Ventral view. Plum Point.
Figs. 14, 15. DRI%Lia LIMATULA var. DISSIMILIS Conrad..............-.. 159
14. Dorsal view. St. Mary’s River.
15. Ventral view. Same locality.
Fig. 16. DRIM@LIA LIMATULA Var. PYRAMIDALIS ND. V€ar........2-eeeeeeeeee 160
16. Ventral view. St. Mary’s River.
Mig 17. DRIMLTA PEHUDEBURNEA™ (WiHLtHel GO) occcteccr ctetereleterotevslesensteveusteer seater 160
17. Ventral view. Plum Point.
34
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XLII.
MOLLUSCA—GASTROPODA.
PLATE XLIII.
PAGE
Figs. 1-3. CANCELLARIA ALTERNATA Conrad .........--.22+20+--+++-s00e 161
1. Ventral view. Jones Wharf.
2. Dorsal view. St. Mary’s River.
3. Ventral view of the same specimen.
Fig. 4. CANCELLARIA ENGONATA Conrad) ....... 2.022 sce c cence serene rens 162
4. Ventral view. Plum Point.
IME, Fh, (ORCA MPN Oboingial Sos caccncocunsonadubsecdogooacan 163
5. Ventral view. St. Mary’s River.
Higss6a, 6b: CANCELEARTAUPRUNTCOLAN DN. SD... -tteleieiceeieietelteietes ienetereraiatietal 164
6a. Dorsal view. Plum Point.
6b. Ventral view of the same specimen.
Hip. F. (CANCELLARIA BETICULATOIDHS! Comrade cn sememieetel seis clele etoile 164
7. Ventral view. Plum Point.
Fig. 8. CANCELLARIA (ADMETE) MARYLANDICA I. SP. .........-----+eeee 165
8. Ventral view. St. Mary’s River.
Fig. 9. CANCELLARIA (TRIGONOSTOMA) PERSPECTIVA Conrad ............. 165
9. Ventral view. St. Mary’s River. Wagner Free Institute of
Science.
Fig. 10. CANCELLARIA (TRIGONOSTOMA) BIPLICIFERA Conrad ............ 166
10. Ventral view. Jones Wharf.
Figs. 11a, 11b. CANCELLARIA (SVELTIA) PATUXENTIA Nl. Sp...........-..4+ 167
lia. Dorsal view. Jones Wharf.
11b. Ventral view of the same specimen.
Fig. 12. CANCELLARIA (SVELTIA) CALVERTENSIS 1. SP. ...........s-eeeees 167
12. Ventral view. Plum Point. U.S. National Museum.
Figs. 13a, 13b. CANCELLARIA (CANCELLARIELLA) NERITOIDEA 0. SP........ 168
18a. Ventral view. Jones Wharf.
13b. Dorsal view of the same specimen.
MIOCENE, PLATE XLIiII.
MARYLAND GEOLOGICAL SURVEY.
MOLLUSCA—GASTROPODA.
PLATE XLIV.
PAGE
IES ahah Oca y GUNN, IDENENTE< GriqooGccnocodudanbpoGoUaHOnOONn 169
la. Dorsal view. Church Hill.
1b. Ventral view of the same specimen.
WSS oes) MOLE AMEDA REIS TRESS lo) ciets ete eieteter aataratas anata feiieyalletatate falda ateaie tot ele taten 170
2. Ventral view of young individual. Plum Point. U. S. National
Museum.
3. Ventral view of larger specimen. Same locality.
Biss 4 MARGINEDGAS MENT MAS PTET) crc crycleveleicie eveletmrencnstey ters) -vel sala ove ieialei 170
4. Ventral view. Greensboro.
Migs 5.) UMARGINEREAs DENTIGUPATAN © ONT iy.ty strerietetetctetctl steele! ofenetelererteletsts aval
5. Ventral view. St. Mary’s River.
Hie 6. (MARGINEDIA GAT VERTENSIS Os (SDier crite) eleistevalelatctersleleterelslelse Istaria 172
6. Ventral view. Plum Point. U. S. National Museum.
Rig 7%, ISCAPHEDDANSOMMDARTA. ((C©ONTAG)/e errerccterreletetenetoreleteieleteeietotenerorsiate 173
7. Ventral view. Plum Point.
Figs. 8, 9. ScAPHELLA (AURINIA) MUTABILIS (Conrad) ............... 174
8. Ventral view. St. Mary’s River.
9. Ventral view of another specimen. Same locality.
Fig, 10. Scarnurnnay (AuRintA) TryPus (Compadi)) W.ccccruamessiaietstmmrsiensielelsiats 175
10. Ventral view. Jones Wharf. .
Fig. 11. ScaAPHELLA (AURINIA) OBTUSA (Emmons) .................0005 175
11. Ventral view. (After Dall.)
Migs WZ SMM A WEAR TANIA poe PS tee ee ee yatretelnteatete tears calieta) euctaletalie va senttal ste ist ooheee 177
12. Ventral view. St.’ Marys River. Wagner Free Institute of
of Science.
36
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XLIV.
MOLLUSCA—GASTROPODA.
PLATE XLV.
PAGE
Hiesiia, dbs WouLreAR spriGnEs (Conrad) svare craic ae onder cere ieterereierenataretate 177
la. Ventral view. Jones Wharf.
1b. Dorsal view of the same specimen.
Migs: 2) o8,.oDsy MULGAR RUSIKORME | CONTAC: <)-yrcabtereeeeinincteeicrieteinioe 178
2. Dorsal view. St. Mary’s River.
3a. Ventral view. Cove Point.
3b. Dorsal view of another specimen. Same locality.
Bigs, 49, 4b es HUuLeaRr TUBHRCULATUNUN CONTAC: 42h aries 179
4a. Dorsal view. St. Mary’s River.
4b. Ventral view of the same specimen.
37
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XLV.
MOLLUSCA—GASTROPODA,
PLATE XLVI.
PAGE
Bigs: las Lbs MUrGAR! CORON AMATO OME (0/06) oma tele r- elev) «) sie ekeleleiaintallelele 180
la. Ventral view. St. Mary’s River.
1b. Dorsal view of the same specimen.
Figs. 2a, 2b. FULGAR CORONATUM var. RUGOSUM Conrad ................- 181
2a. Dorsal view. St. Mary’s River.
2b. Ventral view of the same specimen.
38
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XLVI.
MOLLUSCA—GASTROPODA.
PLATE XLVII.
PAGE
Big. 1. Lirosoma suncosa Conrad «2.2.22... ence eee ree ener ses 183
1. Ventral view. St. Mary’s River.
Figs. 2, 3. CHRYSODOMUS PATUXENTENSIS D. SD... ...-2..6-s-eeeceeeeee 184
2. Ventral view. Jones Wharf.
3. Dorsal view. Plum Point.
Kie. 4. BUCccIOnUSUS) PARTEIS) COMMA terse cprecin otters eile areal ates 184
4. Ventral view. St. Mary’s River.
ISS) 5, CoS TE HO NADA) DE VEEXCAUs (COMMA) ry apereyeteletaleneietslatelelelelietoneleleltetet-t-tatetat 185
5. Ventral view. Plum Point.
6. Dorsal view of another specimen. Same locality.
Figs. 7, 8. SIPHONALIA MIGRANS (Conrad) ............ 5.0 ce ese ewes eee 186
7. Ventral view. Plum Point.
8. Dorsal view of another specimen. Same locality.
39
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XLViI.
MCLLUSCA—GASTROPODA.
PLATE XLVIII.
Fibs. la, 1b. SreHONALIA MARYLANDICA DN. SP. ......0c2ccceceeccs
la. Dorsal view. St. Mary’s River.
1b. Ventral view of the same specimen.
Higo2. ‘SIPHONALIA, (7?) CALVERTAMA: Ue SDires cleisels «sve cress oreteroiterene
2. Specimen from Plum Point. U. S. National Museum.
Figs. 3a, 3b, 4. PIsaANnriA (CELATOCONUS) PROTRACTUS (Conrad)...
8a. Dorsal view. Plum Point.
3b. Ventral view of the same specimen.
4. Tip of a specimen from the same locality. x4
INES by Labdoejivunaip.< Ludmong) (Oly) soocoscascauods0ano0
5. Ventral view. St. Mary’s River.
Hig) 6) PrycHoOsaLpinx MULTIRUGATA CONTA acer cities
6. Dorsal view. Plum Point. U.S. National Museum.
Higw(. PTY CHOSATPINGNs LIENOSIAN CONTAC Mer ieteiielsevcisveleleisioreietre stele
7. Ventral view. Plum Point.
Figs. 8,9. Inyanassa (?) (PARANASSA) PORCINA (Say)..........
8. Ventral view of type-specimen of Buccinuwm porcinum. St.
River (?). British Museum. (After Say.)
9. Ventral view of type-specimen of Buccinwm aratum. St.
River (?). British Museum. (After Say.)
40
PAGE
Suateranetate 186
Mary’s
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XLVIII.
MOLLUSCA—GASTROPODA.
PLATE XLIX.
PAGE
Wig. 1. NASSA GCALVERTENSIS: Te (SD 5c esis. ccinim cleo n= om clos wiv cisies| si ole lslels 191
1. Ventral view. Plum Point. U. S. National Museum.
HS 25 NASS AN GUBBRNATORMAS Te SD )e.ofe) -feysvael a) celal =/eralatelohoveleiekeletettade fekelaiel setae 192
2. Ventral view. Governor Run.
Kigs, 3) 4. INASSA DPRIVITTATOMES: (WHItHCI)) ore oie eer vi eieiee wrpyersts 192
3. Ventral view. Jones Wharf.
4. Ventral view of another specimen. Same locality.
Bigs. bas bday) NASSAU GREENSBOROMNSIS MySite) ers) sterelerrentststeleketalsroieteksatetens 194
5a. Dorsal view. Greensboro.
5b. Ventral view of the same specimen.
IDES GES INP NSIS. ea NIOON 1G BO)agbconcepaoounddbocvornboccceencgDe 194
6. Ventral view. St. Mary’s River.
7. Ventral view of another specimen. Same locality.
8. Ventral view of less elongate individual. Same locality.
Migs 49) 0S NASSAU PHRAT TAN CONTAC ee teeters oiteleveleiel serch saietoraicieroterattteteretene 195
9. Ventral view. St. Mary’s River.
10. Dorsal view of another specimen. Same locality.
Busse eNASS AN PERAT OLDS MC ODL Oieate retical teleteleletselcietenealeteletale ot kerleen tals 195
11. Ventral view. Jones Wharf.
BES INSYNSN Gunny WON SERS Soba boncoadocodbuadboumnoaodccnodcdsoo 196
12. Ventral view. Possibly from St. Mary’s River.
41
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XLIX.
MOLLUSCA—GASTROPODA.,
PLATE L.
PAGE
Bigs: 1,92) “BUELIOPSIS) INTEGRA: (CONTA rye. cyerreere wicterlscrsiore cis teleiisterete sie 197
1. Ventral view of adult individual. St. Mary’s River.
2. Ventral view of young individual. Same locality.
Hig ve bULLIOPSIS QUADRATAN COLAC poleislererskerereteloterstenetsteraiciar- terete Reve tenetels 198
3. Ventral view. St. Mary’s River.
Hig. 45 @BULDIOPSIS! MARY UANDIGAS CONTAC yey-s\-.ystelercia’siclee ters iets! ofslapateistretas 198
4. Ventral view. Cove Point.
Figs. 5-7. CoLUMBELLA (ASTYRIS) COMMUNIS (Conrad) .............--.- 199
5. Ventral view. Cove Point.
6. Ventral view. St. Mary’s River.
7. Ventral view of another specimen. Same locality.
Hig. S9 .CocuMPBEEDAIOALVER TEN SISNMGiS Dive ocreteieesucreavaravenayetsravuseyptalfe(aiarceet annie 200
8. Ventral view. Plum Point. U.S. National Museum.
Figs. 9a, 9b. Murex (PTERORHYTIS) CONRADI Dall...................08. 200
9a. Ventral view. St. Mary’s River. (After Dall.) U. S. National
Museum.
9b. Apical view of the same specimen. (After Dall.)
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE L.
MOLLUSCA—GASTROPODA.
PLATE LI.
Figs. 1-3. TYPHIS ACUTICOSTA Conrad ..........---------ee eee eee eeeeee 201
1. Dorsal view. Cove Point.
2. Ventral view. Same locality.
3. Ventral view. Plum Point. U. S. National Museum.
Figs. 4-6. MURICIDEA SHILOHENSIS (Heilprin).....................---.- 202
4. Ventral view. Plum Point. Cornell University.
5. Ventral view of another specimen. Same locality.
6. Ventral view of another specimen. Same locality.
Figs. 7a, 7b. ‘TROPHON TETRICUS Conrad ............2..eeeeneeereeeare 202
7a. Dorsal view. St. Mary’s River.
7b. Ventral view of same specimen.
Fig. 8. TROPHON TETRICUS Var. L4VIS I. Var........------- eee eres sees 203
8. Ventral view. St. Mary’s River.
Figs. 9, 10. TROPHON CHESAPEAKEANUS Dl. SD.........-..-0.eeeeeeeeee 203
9. Ventral view of young individual. St. Mary’s River.
10. Ventral view of adult. Same locality.
Hiss elsh oe SCARASPIRA IS TRUALOS AN CONTAC cjereray [clerics -taleintslensohele etter ets 204
11. Ventral view. Yorktown, Virginia.
12. Ventral view.” St. Mary’s River.
13. Ventral view. Cove Point.
Hiss l4 elds UROSADEMXa CLNMREUS) (Sap) Mca icietal-)telslertetonestete eveleretelerrorcietay= 205
14. Ventral view. Cove Point.
15. Dorsal view of another specimen. Same locality.
Pigs: 16, 175) WURoOSMEPINE] RUSTICUS (COMTI) eaar.terteter trate etae tenet ted 206
16. Ventral view. St. Mary’s River.
17. Ventral view. Cove Point.
Figs. 18-20. CoRALLIOPHILA CUMBERLANDIANA (Gabb) .................. 211
18. Dorsal view. St. Mary’s River.
19. Ventral view. Same locality.
20. Dorsal view. Same locality.
43
MIOCENE, PLATE LI.
MARYLAND GEOLOGICAL SURVEY.
MOLLUSCA—GASTROPODA.
PLATE LII.
Migs 71-35 | HOPHORAS QUADRICOSTATAN ((Saya)iciesastecielerreis oteisiele eiersiene
1. Ventral view. St. Mary’s River.
2. Ventral view of young individual. Cove Point.
3. Specimen from Maryland, after Lister (fide Dillwyn).
Fig. 4. EcpHoRA QUADRICOSTATA var. UMBILICATA (Wagner).....
4. Ventral view. Jones Wharf.
Migs: 5-85 -HOPHORA: TRIGOSTATAN Ms ISPs creieicisevercieieieierel cierarelevansieteieratens
5. Ventral view. Plum Point. U.S. National Museum.
6. Ventral view of younger individual. Same locality.
7. Ventral view of very young individual. Same locality.
8. Ventral view of aberrant form. Same locality.
Figs. 9, 10. ScpHors TAMPA NSIS: (Dail)! ace ce cnet ere steve berets
9. Ventral view. Church Hill. U. S. National Museum.
Dall.)
10. Ventral view. Jones Wharf.
44
(After
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LII.
MOLLUSCA—GASTROPODA.
PLATE LIII.
PAGE
Figs. a, 2: sSCADA SAVANNA DAIL wis css nce Siac Ricvaceetoe alates se ioustamMelovete a cis eaeselstene 212
1. Ventral view. St. Mary’s River.
2. Ventral view. Greensboro.
Hig) 3: SCALA MARYGANDICAY DE iSDpeie)- 1 scree eielsieverelolsleieistsieleieveleietalelaler steers 213
3. Ventral view. Jones Wharf.
Wig. (4. (SCABA (OPATTA)) CALVERTENSIS MCSD: c\eleic cicle conse canleileimteieeiote nial 213
4. Ventral view. Plum Point. U. S. National Museum.
Miz. bi Scare (OPATTA) RETICULATA CTH SDs recrescre, ote eicte.c-ccevsuaPenecerarchota ste mictelece 214
5. Ventral view. Plum Point.
Higth6) = SCALAy GOPATTA) SPRUWMECOLA WMS (SD ies cvs 0 '«) sateinte es teisunl ote lorermiakereieietene 214
6. Ventral view. Plum Point.
Hig. 7-5 SCALA "(STHENOREYTIS) EXPANSA (Conrad... 0.065 sieclns co oe ce ee tee
7. Ventral view. Jones Wharf. Wagner Free Institute of Science.
Fig. 8. Scata (STHENORHYTIS) PACHYPLEURA Conrad ..............+++- 215
8. Ventral view. Plum Point.
Migs 9510 SH ULENTAMORORBAN CONTACT) miciel cies steelers ae cron ieteiete 216
9. Ventral view. St. Mary’s River.
10. Ventral view of another specimen. Same locality.
Lif ee ST A Dhaai a ON VAC UWN (sb (CR IUCED) Goagmooormodaude coden dodges sé aanoe 217
11. Ventral view. St. Mary’s River.
Rig: 125 DULIMAUMIGRANS CONTAC. seuctis scr rigcie © cusicue casi erelsiomueenaroce stares 217
12. Ventral view. Cove Point.
Mig: 135s NIs0 TINBATA (CONTAC Ay yccmiy eine orvariee ie crores auctonvetiekarcten eters 218
18. Ventral view. Plum Point.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LIII.
MOLLUSCA—GASTROPODA.
PLATE LIV.
Fig. 1. Oposrom1A (CHRYSALLIDA) MELANOIDIS (Conrad) ..
1. Ventral view. St. Mary’s River. Cornell University.
Fig. PYRAMIDELLA (CHRYSALLIDA) GRANULATA (H. C. Lea)
Sci., Phila.
Figs. 3, 4. OposTomMIA CONOIDEA (Brocchi).................
3. Ventral view. Jones Wharf.
4. Ventral view. St. Mary’s River.
Fig. 5. Opostomia (EVALIA) MARIANA D0. SP. .........---.+
5. Ventral view. St. Mary’s River.
Fig. 6. Opostom1A (SYRNOLA) MARYLANDICA N. Sp. .........
6. Ventral view. St. Mary’s River. Cornell University.
Figs. 7, 8. OposTtoMaA (PYRGULINA) CALVERTENSIS 0. Sp. ....
7. Ventral view. Plum Point.
8. Ventral view of another specimen. Same locality.
Figs. 9, 9a. EULIMELLA (ANISOCYCLA) MARYLANDICA 0. SD. .
9. Ventral view. St. Mary’s River.
9a. Nucleus of the same specimen, much enlarged.
Fig. 10. TursBontntA (CHEMNITZIA) NIVIA Stimpson .......
10. Ventral view. St. Mary’s River.
Figs. 11, 12. TursonininaA (CHEMNITZIA) NIVEA Stimpson var
11. Ventral view. Cove Point.
12. Ventral view. St. Mary’s River.
Figs. 18, 14. Tursoninia (Pyreiscus) InTERRUPTA (Totten)
13. View of specimen from Greensboro.
14. Ventral view. St. Mary’s River.
Fig. 15. TurBoNILLA (TRAGULA) GUBERNATORIA Nl. Sp. ......
15. Ventral view. Governor Run (lower bed).
46
2.
2. Ventral view of type specimen. Petersburg, Virginia.
Acad. Nat.
FOOUOTOoDONO 221
J6addgbcoeec 221
Goo0WDOGDCCS 221
Pinion née bc 224
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LIV.
MOLLUSCA—GASTROPODA.
PLATE LV.
PAGE
Migs. de 25 SRITONTUM CEN TROSUM ((CONTAM))) va reeietela:-lelsterereretestsicieiieltearensiane 225
1. Ventral view. Plum Point.
2. Ventral view of younger individual. Same locality.
Riz Sa) PYRULA PRABRIST MBS Ph sisce.cisjeccrereys where cverake al ete oye cis orevsl<leteionsterevereyenets 226
3. Ventral view. Plum Point.
Hie 45 ICASSISh CAUATAS CONTAC amyeriersit-teretaterieilcietereversioteieleteieierelererecekelaietar 226
4. Ventral view. St. Mary’s River.
IEP DION yada tacugN ((COmmbeKsl)) SaagacodaghooncoausadnEsoocdDOooNdSS 227
5. Ventral view. Plum Point. U.S. National Museum.
1DGS iy, Soper PNY econ (UE Ch IW) San ooomopadbonodoocdnsounocgqooK.4 228
6. Ventral view. Plum Point.
Hi Poe CERITHIOPSISMCALVER TEN SIS 1S D)-lelciolcietatetaralstaterts | steletalevelalel-lotaereteks 229
7. Ventral view. Plum Point.
Fiz: 8: CERITHIOPSIS SUBULATA (Montagu): 3... 2 vec cee ris ele n= 230
8. Ventral view. Greensboro.
Hie. 95 (GONTOBASIS: MAR Vay AWNDICAN IM NSD mere el-lereieledeievellenstst-lateratetalstelistietelt-tafalets 230
9. Ventral view. St. Mary’s River.
Wigs 105 IC: ACUM ICAL VERTENSEN Is) Ss) teoieeteieletotelctafefalale) fat'e)(-/-1-0-tot-Pal-torel=)=lieisiai= 231
10. Specimen from Church Hill.
ips, alal, ales (OysaXoyon) sWAunop-aoauqonve 1, EIS SoggcoosouonondGonDGCODaCoOOr 231
11. Specimen from Greensboro.
12. Specimen from Governor Run (lower bed).
Hie also A CUM GREENSBOROPNSEelemS Pais clei yelaleleleycleleleleierettcieieiensieleteleteteretels 231
13. Specimen from Greensboro.
Missa 150) VERMETUS GRANT HR US a (Saye icielajelclelletenelsiericucreteletslerereieraletoiot 232
14. Specimen from Church Hill.
15. Specimen from Jones Wharf.
Miz 6.) IVERMETUS WVIRGINICUS (CONTA)! crarcieeiereds chercieccicrors eveicieie otereietaraiete 232
16. Specimen from Plum Point.
47
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LV.
MOLLUSCA-—GASTROPODA.
PLATE LVI.
Wigs A 26) DOURRITEUCASINDENTAs CONTAC! jena. tcieveerereioiaeeaeiee
1. Ventral view. 3 miles south of Chesapeake Beach.
2. Ventral view. Plum Point.
ips, MboaumnaiN, Looyenspunoey (OlareKsl Ge adcaounanueocdonoaon
3. Ventral view. Church Hill.
BMes 44-9) S DURRITEDTAGEPEE BETA SAY mmaioreversielarerctercieictelseteieretoienciete oreo
. Ventral view of typical form. St. Mary’s River.
. Ventral view of typical form. Jones Wharf.
Specimen from Jones Wharf showing var. A.
. Specimen from Plum Point showing var. B.
. Specimen from same locality showing var. A.
. Specimen of var. octonaria. Dover Bridge.
48
MARYLAND GEOLOGICAL SURVEY, MIOCENE, PLATE LVI,
MOLLUSCA—GASTROPODA.
PLATE LVII.
Wigeats MURRILELGARVARTABITIS | CONTAC acim satelenelcideketieiiereretetchttae herein even 236
1. Specimen from St. Mary’s River.
Fig. 2. TURRITELLA VARIABILIS var. ALTICOSTATA Conrad............+..- 237
2. Specimen from Dover Bridge.
Figs. 3, 4. TURRITELLA VARIABILIS var. CUMBERLANDIA Conrad............ 237
3. Specimen from Plum Point.
4. Another specimen from the same locality.
Fig. 5. ‘TURRITELLA VARIABILIS var. EXALTATA Conrad .................; 238
5. Specimen from Plum Point.
Higsy26-8.) LURRITETTAG VARTABITIG) Welleryeiererterkeienersenenctsieteerersrerereicrersrsasicnstens 239
6. Specimen of var. B. Plum Point.
7. Another specimen of the same. Same locality.
8. Specimen of var. C. Plum Point.
Fig. 9. TACHYRHYNCHUS PERLAQUEATUS (Conrad) ..................-. 239
9. Ventral view of type specimen. ‘ Calvert Cliffs.” Acad. Nat. Sci.,
Phila.
49
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LVII.
MOLLUSCA—GASTROPODA,
PLATE LVIII.
PAGE
Mise | SLITTORIVA TRRORAWA LC SAQya)! ssyerc cyersisteasltapsnerstoncieacyeisesloesrsReraercrsteceretalrepe 240
1. Ventral view. Choptank River. U.S. National Museum.
Inte VL Mo Suosy (Cstas)) woywepn (Mohn) GooooancaguaoocdounbOOONes 240
2. Ventral view. Plum Point.
Kigs. 3a-3¢, SoLraARlom TRmINpATUN (Commad 2.5.1 ele 241
3a. Profile of specimen from Plum Point.
3b. Upper view of same specimen.
3e. Lower view of same specimen.
Bigs: 4a4ipy —SOLARTUNT ANeP ELL DER Until) allluewep.y scene pacehlenelstretletenenenenereneietonens 242
4a. Upper view. Greensboro. U.S. National Museum. (After Dall.)
4b. Lower view of same specimen. (After Dall.)
Bib 5. eRISsos) (ONOBAD)) sMARYIEANDIGAGT. (SD lseereei terrier tee veltareaeieens 243
5. Ventral view. Cove Point.
Migs) 62-65 -ADEORBIS! SUPRANITIDUS) 55-0 WiOOGS -)-ceyeetereretsr -retetoter- tetera ane ualtetats 243
6a. Profile view. St. Mary’s River. Wagner Free Institute of
Science.
6b. Upper view of the same specimen.
6c. Lower view of the same specimen.
Higsaa. (bse CRUCIBULUMNCOSTADUNT (Saami titi irerccienicr tie teren iene: 244
7a. Dorsal view. Plum Point.
7b. Ventral view of the same specimen.
Figs. 8-10. CrucinuLUM COSTATUM var. PILEOLUM (H. C. Lea).......... 245
8a. Dorsal view. St. Mary’s River.
8b. Ventral view of the same specimen.
9a. Dorsal view of young individual. St. Mary’s River.
9b. Ventral view of the same specimen.
10. Dorsal view of another specimen. Same locality.
Migs i.) CrocrmunuMm CONSTRICLUM: (CONTAC fier accciiee cece cee ee erate 246
11. Dorsal view. St. Mary’s River.
Figs. 12a, 12b. CruUcIBULUM MULTILINEATUM Conrad .................. 246
12a. Dorsal view. Jones Wharf.
12b. Ventral view of the same specimen.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LVIII.
Hy,
i) ses
MOLLUSCA—GASTROPODA.
PLATE LIX.
IER Ie CANO. NBO (ROEM) sogdpodoouasnutoonesscadasncanc 247
1. Dorsal view. Plum Point.
Mies 6 2a-2C we) CAT PUR AAG CHNDRALIS HE (COMPA) kei aeiitere renee ene eto 248
2a. Dorsal view. St. Mary’s River.
2b. Ventral view of the same specimen.
2c. Lateral view of the same specimen.
Migs) 3a, ob. | CALYPTRATA’ GREENSBOROENSIS) 1. SD: o...)- soe eee cece eases 248
3a. Interior of specimen from Greensboro.
3b. Exterior of the same specimen.
iess 4a Abs \CREPIDULANHORNICGATAN (duinnG)) mreeaeeereciaciceeeo see 249
4a. Exterior of specimen from Cove Point.
4b. Interior of the same specimen.
Migstbansb be, (CREPIDUMAGPTAIIAUOaYO ate ciecmreetnic ee mee ne eee ae ee 250
5a. Exterior of specimen from Plum Point.
5b. Interior of the same specimen.
IMS Eells YAMIN SI OV, NUN THGONNINIECY 1s Ei) oooodaosensoaonaovensesecer 251
6a. Exterior of a specimen from Greensboro.
6b. Interior of the same specimen (muscular scars drawn from a
specimen from Jones Wharf).
6c. Lateral view of the same specimen.
6d. Beak of the same specimen, much enlarged.
Figs. 7a-7¢c: XENOPHORA CONCHYLIOPHORA (Born) .............-.+«---- 251
7a. Exterior of a specimen from Plum Point.
7b. Interior of the same specimen.
7c. Lateral view of the same specimen.
51
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LIX.
MOLLUSCA—GASTROPODA.
PLATE LX.
PAGE
Fig. 1. Potynices (NEVERITA) DUPLICATUS (Say) ..........-..--2.-055 252
1. Ventral view. St. Mary’s River.
Fig. 2. Potynices (LUNATIA) HEMICRYPTUS (Gabb) .................. 252
2. Ventral view. Jones Wharf.
Migs! 3) 4 LOLYVNIGHS a GLUitNA TCAD) EC ROS) (CSAs) eusrweneterotetaterore inet aneretete eels 253
3. Ventral view. Jones Wharf.
4. Ventral view. St. Mary’s River.
Figs. 5a, 5b. SIGARETUS FRAGILIS Conrad ...............-. eee eeeeeeevee 255
5a. Ventral view. Plum Point.
5b. Dorsal view of the same specimen.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LX.
MOLLUSCA—GASTROPODA.
PLATE LXI.
Rig: 1. ‘Carrmrosroma BEELUMD) (Comrad)y prc. cere eres cclcus sretste tare ihe Ge eusieceiet 256
1. Ventral view. Miocene of Maryland. Wagner Free Institute of
Science.
Figs. 2, 3. CALLIOSTOMA PHILANTHROPUS (Conrad) ..................- 256
2. Ventral view. 2 miles south of Governor Run.
3. Ventral view of typical form. U. S. National Museum. (After
Dall.)
hig. 4.. CALLiosroma, PHT AN DERORUS) avelln teres )-seneretsailove tees esednisienaiaye ce) ete ietat 257
4. Ventral view. Jones Wharf.
Miz. ICALETOSTONIAN VIRGUNTOUNIN (COMMA) pic tcnelereldiencye/oretetei-borcyonelotenel 257
5. Ventral view. Miocene of Maryland. Wagner Free Institute of
Science.
Hie Gua CAMMOSTONAT DIS TAR S| COL ad) eeyeymiesenere tenses teeter eterno raiet ea ranean 258
6. Ventral view. St. Mary’s River.
Migs ia) ACAMMIOS TOMA EBORNU Ml (AVWALTICD)) acy -tetcucieteyeisistteleksteietereieesiccensrelloneiers 259
7. Ventral view. Reed’s.
Hige8s (CALDBIOSTOMA: WAGINERT, DALL) c.a:d. os. Sreyecs +: sualecusutstst ro. rans eerie reienen ee 260
8. Ventral view. Greensboro. U. S. National Museum. (After
Dall.)
Bigs 9-1) (OAmMIOS TOMA APE ETO Macon pene ny cet anette Retain a eieadee een tere 260
9. Ventral view. Jones Wharf. U. S. National Museum. (After
Dall.)
10a. Profile of specimen from Jones Wharf.
10b. Same specimen seen from above.
11. Specimen seen from below. Cordova.
Bizd2s CALEIOSTONAPHR AT yma ouen (COLMA Ci) lvmtetenetnetetctteryaltstersictsretetn tetera 261
12. Ventral view. Plum Point.
lan tach MBER Or OlsivoyN asquatunna) (Ofoymdiel)) Soscénooncodgooncbopoccn 261
13a. Profile of specimen from St. Mary’s River.
13b. Upper view of same specimen.
13c. Lower view of the same specimen.
Figs. 14a-14c. CALiLIostomMa RECLUSUM (Conrad) ....................... 262
14a. Profile of specimen from St. Mary’s River.
14b. Upper view of same specimen.
14c. Lower view of same specimen.
Migs) ba, dibbs CAnmmrosTOMAy NPAR YG AINDICUIME Te SD) iene etste -ferelsenetetaneniers 263
15a. Profile of specimen from Plum Point. U. 8S. National Museum.
15b. Same specimen as seen from above.
Kigs, 16a-l6e) (CAMETOSTONIA ‘CALVIR TANTO MAS Di ejsic iets tele elsisrere -1sterteoenerels 263
16a. Profile of specimen from Plum Point.
16b. Same specimen as seen from above.
16c. Same specimen as seen from below.
53
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXI.
MOLLUSCA—GASTROPODA,
PLATE LXII.
PAGE
Figs. 1, 2. TEENOSTOMA NANUM (Lea) ...-..-..- ese eee eee cece eee e eee 263
ja. Profile of specimen from Cove Point.
1b. Same specimen as seen from above.
1c. Same specimen as seen from below.
2a. Profile of specimen from St. Mary’s River.
2b. Same specimen as seen from above.
2c. Same specimen as seen from below.
Figs. 3a-3c. TEINOSTOMA CALVERTENSE I. SP. .......---.-----+e eee sees 264
3a. Profile of specimen from Plum Point.
3b. Upper view of the same specimen.
3c. Lower view otf the same specimen.
Wigs: 4a-4c. TEINOSTOMA LIPARUM (H. C. Lea)... 2.2.2... eee ees 264
4a. Profile of specimen from St. Mary’s River.
4b. Upper view of the same specimen.
4c. Lower view of the same specimen.
Figs. 5a-5e. 'TEINOSTOMA GREENSBOROENSE 0. SP. .....-.+.eeee cece ee eeeee 265
5a. Profile of specimen from Greensboro.
5b. Upper view of the same specimen.
5e. Lower view of the same specimen.
Migs 0a-0C.) COCHTIOLMPES iS EREAT AD) aller. peat tcrel tere eat Reker sttehetsneterenetat=n 265
6a. Profile of specimen from Plum Point. U. S. National Museum.
6b. Upper view of the same specimen.
6c. Lower view of the same specimen.
Biss iio MOLEERLAS MENTS CULAG SD alge rer crcrem perenne: eictens er eteratenetsporeleta) ele tetelen=t= 266
7. View of type specimen. St. Mary’s River. U.S. National Museum.
54
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXIil.
MOLLUSCA—GASTROPODA.
PLATE LXIII.
Higsislah lib a RISSURIDEA “ALTICOSTAGICEONTAU!) facie otrsicrse sels eieneny oe feentee 266
la. Dorsal view. St. Mary’s River. Wagner Free Institute of
Science. -
1b. Lateral view of the same specimen.
Mizs:27°35" RISSURIDEA iGRISCOMT (Conrad!) sccm ooo elem onc ctaebereretrernie 267
2a. Dorsal view. Church Hill.
2b. Lateral view of the same specimen.
38a. Dorsal view of young individual. Same locality.
3b. Lateral view of the same specimen.
Figs. 4a, 4b. HWISSURIDEA MARYLANDICA (Conrad) ............:e.eceees: 268
4a. Dorsal view. Plum Point.
4b. Lateral view of the same specimen.
Hips bas 5 DH ELISSURIDEAy WASS HT Aa @OnTaG!) i aelyaeiecieeiciinaiee terete 268
5a. Dorsal view. Jones Wharf.
5b. Lateral view of the same specimen.
Bigs 6:) VRISSURIDEASREDIMTCUTAUGSS Ya) ei e nen cisiciele nie elaine eee 269
6. Lateral view of type specimen. St. Mary’s River. British
Museum. (After Say.)
Hiss 7a, Ds EMCARGINU IAD MAR YIFANIDTCAMTISES Disrellelereleiesiceieicieiotoletcineiateton ine 269
7a. Lateral view. Greensboro.
7b. Dorsal view of the same specimen.
MARYLAND GEOLOGICAL SURVEY.
MOLLUSCA—GASTROPODA.
MIOCENE, PLATE LXill.
PLATE LXIV.
PAGE
Migs ite tORrATOPLEURA APTOUIMAMT AM SAYA) mic ciclciclcictelereicleie clarelciatetetsionte crete 270
la. Ventral view of posterior valve. 3 miles south of Chesapeake
Beach.
1b. Dorsal view of the same specimen.
2a. Dorsal view of anterior valve. Plum Point. U. S. National
Museum.
2b. Ventral view of the same specimen.
2c. Anterior view of the same specimen.
Hips: DEN TATIOM A TMENUATUM Sayre nisiciciets cies cca) aleities apecrclelsterceeatenee ici 271
3. Specimen from St. Mary’s River.
IMG AS IDM IU PO NPNR MINIS So pasando soudenboosGodnood oo oenuaneonuc 272
4. Specimen from Plum Point.
Mies bay ob. DENTAELUIMe CAD ULOMD EMD alliecyerctejeiene cielo cuiacinetaeesterererereets 272
5a. View of specimen from St. Mary’s River. U.S. National Museum.
(After Dall.)
5b. View of aperture of the same specimen. (After Dall.)
Bie i6. Capp LUS RTHALEUS «(COnTaAd) i -qncsien see oe Ene oreo 273
6. Specimen from Plum Point.
Fig, 7. CAaDULUS NEWTONENSIS Meyer and Aldrich.........-...s.eceuees 2738
7. Specimen from Jones Wharf.
56
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXIV.
MOLLUSCA—AMPHINEURA AND SCAPHOPODA.
PLATE LXV.
Bic. 1. Proras CRAORANWA)) PRODUCTA, Conrad! > 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, <eve eremetoleun sie ofeeue chebet <rayre
1. Exterior of right valve. Jones Wharf.
2. Interior of right valve of another specimen. Same locality.
3. Interior of left valve. Same locality.
Migs) 14-bit ss CORBULAM HEE VAAL CONTAC tie eveeieretalere shel stsraivie le aistelchel suis teteientalensts
4. Interior of right valve. Plum Point.
5. Exterior of right valve. Same locality.
MY S85) 6-14 eC ORBULA REN AT Q DIALS SOya meveretarcier ere cher iateut cs tayeliciaters teleltarareNetareietateres
6.
. Interior of right valve. Plum Point.
. Exterior of right valve of large variety. St. Mary’s River.
. Exterior of valve. Jones Wharf.
. Exterior of left valve. Church Hill.
. Interior of left valve of coarsely sculptured variety. Plum
Exterior of right valve. Church Hill.
Point.
. Exterior of right valve of same individual as shown in Fig. 11.
. Exterior of left valve. Jones Wharf.
. Exterior of right valve. Oligocene of Oak Grove, Fla. Type
specimen of C. whitfieldi Dall. (After Dall.)
Wiess15-19- \CORBULA, CUNBATAN SAY: (eicielelsietsieieiere olelele ictetetersieleretelereietere terete tenet
15.
16.
17.
18.
ify
Interior of left valve. Jones Wharf.
Exterior of left valve. Same locality.
Exterior of right valve. Same locality.
Exterior of right valve. Same locality.
Interior of right valve. Same locality.
59
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXvVII.
MOLLUSCA—PELECYPODA.
PLATE LXVIII.
Bigs: lay by 255 vival PROD UCLA, COMMAG jercepsle ekepetacersieloiectar<lorayelenencletatars
la. Interior of left valve. Jones Wharf.
1b. Exterior of same valve.
2. Profile of hinge area of same valve.
Wigs: 3-65) SPHENEA DUBLAN (UE Cuca) iy ayeteislseteiel rer stevaloreleleletecretaist=relaists OR Gere
3. Exterior of left valve. Jones Wharf.
4. Exterior ‘of right valve. Jones Wharf.
5. Interior of left valve, large specimen. Jones Wharf.
6. Exterior of right valve, same individual as Fig. 5.
HSS on Sen ARAN YA TS UBOVADAN COMMA Cuentorspetteterseistetera/arpatateterteretetelerers
7. Interior of left valve. Two miles south of Governor Run.
8. Exterior broken valve. Jones Wharf.
60
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXVIII.
MOLLUSCA—PELECY PODA.
PLATE LXIX.
Migs: 1-35 IMESODESMA’ OMARTANIAL TSP is\eiereicteteieye sisveretatrsielon ice teteteioterelonsieieieiere 285
1. Exterior of right valve. Cove Point.
2. Interior of right valve. Same locality.
8. Interior of left valve. Same locality.
1D Fes 26, eee OL an een oye ODE NS a omedica Goo OO COU DUS Snot aod a.c08 285
4. Interior of left valve. Church Hill.
5. Interior of right valve. Same locality.
6. Exterior of left valve. Same locality.
ies. 7-94) IMIACTRA: CLA THRODON PLGA leiiaiiieiialsiiereiete)elelel oleyaietetsichaiateral excel 286
7. Interior of left valve. Cove Point.
8. Exterior of left valve. Same locality.
9. Interior of right valve. Same locality.
Fig. 10. Spisuta (HEMIMACTRA) DELUMBIS (Conrad) .................. 286 —
10. Interior of right valve. Suffolk, Va. 96 mm. (After Dall.)
x 5/6
Fig. 11. Sprsuna (HEMIMACTRA) MARYLANDICA Dall ................-.. 287
11. Interior of right valve. 92 mm. (After Dall.) xX %4
Figs. 12, 13. Spisuna (HEMIMACTRA) CURTIDENS Dall...............-:- 288
12. Outline of young shell traced from incremental lines on broken
larger valve. 35 mm. (After Dall.) x 5/6
18. Hinge-plate of right valve: a, dorsal and e, ventral anterior
laminae; b, anterior arm of cardinal tooth; c, ligament scar,
without septum below it; d and f, posterior laminae. 44 mm.
(After Dall.)
61
MARYLAND GEOLOGICAL SURVEY.
MOLLUSCA—PELECYPODA.
MIOCENE, PLATE LXIX.
PLATE LXxX.
Figs. 1-4. SprsutA (HEMIMACTRA) SUBPONDEROSA (d’Orbigny)..........
1. Profile of hinge from above, left valve: a, anterior lateral; b,
cardinal tooth; c, accessory lamella; d, spur with part of the
cavity for the sagittal ligament below it; e, scar of attachment
of ligament; f, posterior lateral lamina. 70 mm. (After Dall.)
. Exterior of right valve. St. Mary’s River. x %
. Interior of left valve. St. Mary’s River. x %
. Hinge-plate of left valve: a, dorsal and e, ventral posterior laminae;
b, ligamentary scar not separated from the pit below by a sep-
tum; c, spur; f, accessory lamella; i, petaloid cardinal tooth; d,
anterior lamina with s, absorption scar, from central lamina of
opposite valve. 70 mm. (After Dall.)
Hm 02 bo
Figs. 5a, 5b. Sprsuta (HEMIMACTRA) CONFRAGA (Conrad) .............. 289
5a. Exterior of left valve of type specimen. Patuxent River. Acad
Nat. Sci., Phila.
5b. Interior of the same valve.
289
Figs. 6a, 6b. SprsuLA (HEMIMACTRA) SUBPARILIS (Conrad)..............
6a. Interior of right valve. Plum Point. U. S. National Museum.
6b. Exterior of the same specimen.
62
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXxX.
MOLLUSCA—PELECYPODA.
PLATE LXXI.
PAGE
Fig. 1. Sprsuta (HEMIMACTRA?) CHESAPEAKENSIS D. SP. .......---22-0% 290
1. Exterior of right valve. 3 miles north of Plum Point. x %
Higs-2; 3: HNSISUDIBECTUS! ((COMTAGINE otras eves arevieiniciclere clei michne aie starchey arctene 291
2. Interior of left valve. Yorktown, Va.
3. Exterior of right valve. Same locality.
Bigs: 4-65 HINSIS) ENSITORMIS! (CONTAC. eine ate =o cteue lave) toler si eleleleieaiersicnstatatate 292
4. Posterior portion of broken valve. St. Mary’s River.
5. Posterior portion of broken valve. Same locality.
6. Interior of left valve. York River, Va.
Bigsy as be SAM MOBLA) GUBERNATORIAY D1. US Delete s/-tslulelalorsielslel els sleleteretel-tole isle 292
7a. Interior of left valve. Jones Wharf.
7b. Exterior of same valve.
Bigs. &, 9) A'SAPHISICENTENARIA, (Conrad)! 3 ./yci-c.0- erciciete crests eisicie <ieeiere 293
8. Interior of left valve. Jones Wharf.
9. Exterior of left valve. Same locality.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXxXl.
¥,
,
<I
PTS STAY RE
MOLLUSCA—PELECYPODA.
PLATE LXXII.
Figs. 1-3. SmMELE CARINATA (Conrad))* Siavwnaisd cross semester we selene 294
1. Exterior of right valve. St. Mary’s River.
2. Interior of right valve. Same locality.
3. Exterior of left valve. Same locality.
Figs. 4, ba, 5b. SEMELE CARINATA Var. COMPACTA Dall.................- 294
4. Exterior of right valve. St. Mary’s River.
5a. Interior of right valve. Oligocene of Oak Grove, Fla. 16.5 mm.
(After Dall.)
5b. Exterior of valve of Fig. 5a. (After Dall.)
Migs: 66-8) SSEMELE WM SUBOVAWAN SAY: |i covevaie cratareos velop) sucheenclalievy cletaleromemnaiererstate 295
6. Exterior of right valve. Jones Wharf.
7. Interior of right valve. Same locality.
8. Exterior of left valve. Same locality.
Kics: Gao Spa mABRACDONGICAMIEAS @SCACCHI)) iuscu-recerceetar-rereietel« ciel eiataketerertee eter 296
9a. Exterior of right valve. Jones Wharf.
9b. Interior of same valve.
Fiz, 10S. ABBA WARY ANDICACIUGS Dh va maunisnacretersus<. obs chai) vletossveretene ey ear ease 296
10. Interior of left valve. Plum Point.
Rigs) (hy 22) CO MINGIA ACEDIATIS™ COMME C=: sieitis stevelstsncteieiaraes cretarea tater senteye 297
11. Exterior of left valve. Jones Wharf. (?)
12. Interior of left valve. Same locality.
Hie! 23 TEE INVAY ACOUISTREATAMSAVn crate stejeisisiccerelnevactore stem tarice cietercenaaiter 297
13. Exterior of left valve. Jones Wharf. (7)
Fig. 14. Trertirva (ANGULUS) DECLIVIS Conrad
14. Exterior of left valve. Plum Point.
Migs: 15,316) siren CANGURUS) pPRODUCTARCONTAG iene aici 299
15. Exterior of left valve. Plum Point.
16. Exterior of left valve. Cove Point.
64
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXxil.
— 15 Set LG
MOLLUSCA—PELECYPODA.
PLATE LXXIII.
Bigs may | CAINGULUS)) = DUPRTUNTANCANNE) Bnav ny cere ieveteteneversisteten-tensierelsietels 299
1. Exterior of left valve. Duplin Co., N. C.; length 12.5 mm. (After
Dall.)
Hig’ 2. VTErcrmva |CANGULUS))UMBRA Dale Aare ciclcrerctelclelatenctetsehicrerctietenerexniels 300
2. Exterior of left valve. Duplin Co., N. C.; length 12.6 mm. (After
Dall.)
Wigs. 35 AS. WEA COMATEENTS IG COMEAG i temghala iets vesicis cuouciels aiacaien caieeete ese ste pearatee 301
3. Interior of right valve. Jones Wharf.
4. Exterior of left valve. Same locality.
Bigs) 6: eMEnrs BIPLICAPA) CONTAC! crercrcrcuray-veusererereiake sie velcieteletesouensielsiere tetera 301
5. Interior of left valve. Jones Wharf.
6. Exterior of right valve. Same locality.
Mig: a7... MA COMAMVIALAR YIGANDIGAY “TEAS Dictejelerefeyeys csi « ele leraieelareiohe jeroneesne tevenet lense eis 302
7. Interior of right valve.
Rigs 8309 (PETRICOWAY HARRISTI Dall) acysvetceayveleieie overs leteyererseersyavenstate eters 302
8. Exterior of right valve. Jones Wharf.
9. Interior of left valve. Same locality.
Figs. 10-12. Prrricota (PETRICOLARIA) CALVERTENSIS Dall............... 303
10. Exterior of right valve. Miocene of Maryland; length 17.5 mm.
(After Dall.)
11. Distorted right valve. Jones Wharf.
12. Left valve. Same locality.
Figs. 13, 14. CaLLocarDIA (AGRIOPOMA) SAYANA (Conrad) ............. 313
13. Exterior of right valve. Jones Wharf.
14. Interior of right valve. Same locality.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXxXill.
|
5]
aoe
SS
MOLLUSCA—PELECYPODA.
PLATE LXXIV.
PAGE
Figs. 1, 2. MACROCALLISTA MARYLANDICA (Conrad) .................... . 311
1. Interior of left valve. Jones Wharf.
2. Exterior of right valve. Same locality.
See. ee ey
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXxXIv.
MOLLUSCA—PELECY PODA.
PLATE LXXV.
PAGE
Figs. 1-3. CaLnLocarpIA (AGRIOPOMA) SUBNASUTA (Conrad)............. 312
1. Exterior of right valve. St. Mary’s River.
2. Interior of right valve. Same locality.
3. Exterior of right valve. Same locality.
Figs. 4-6. CaALLocarpIA (AGRIOPOMA) PRUNENSIS 0. SP. ............-0005 313
4. Interior of right valve. Plum Point.
5. Exterior of left valve. Same locality.
6. Exterior of right valve. Same locality.
TOs TG tee — Aono tohoKoyNinonar (CforohneKl Sooo coobooadogo odo dConDDOb God COMON 304
7. Interior of left valve. Church Hill.
8. Exterior of right valve. Same locality.
67
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXV.
MOLLUSCA
PELECY PODA.
PLATE LXXVI.
Figs. 1-3. CHIONE ALVEATA (Conrad) ......5.-..02.eececes cece esse acces 310
1. Interior of right valve. St. Mary’s River.
2. Exterior of right valve. Same locality.
3. Exterior of right valve. Same locality.
Wigs. 4, 5. Venus! Robeyr Conrad) 2 oo. c ee ines ee eee iri ier 304
4, Interior of left valve. Plum Point.
5. Exterior of right valve. Same locality.
Figs. 6-8. CyrHEREA (ANTIGONA) STAMINEA Conrad .........--..-.-..++ 314
6. Interior of right valve. Plum Point.
7. Exterior of left valve. Same locality.
8. Exterior of right valve. Same locality.
iiteh Veils (Chandni, WAAAY deh, Hid soponnonodooudsacpoocmbosscuuseoae 310
9. Exterior of right valve. Two miles south of Parker’s Creek.
10. Interior of right valve. Same locality.
11. Exterior of left valve. Same locality.
MARYLAND GEOLOGICAL SURVEY.
MOLLUSCA—PELECY PODA.
MIOCENE, PLATE LXXVI.
PLATE LXXVII.
PAGE
Figs. 1, 2. VENUS CAMPECHIENSIS Var. MORTONI (Conrad)..............- 307
1. Exterior of right valve. Cove Point.
2. Interior of left valve. Same locality.
Mifs5-On es OHIONE, PATINA TAN (CONTA) © oar ciraleeclevelcraiceverst vera ereseeenerete 309
3. Exterior of right valve. Plum Point.
4. Exterior of right valve. Same locality.
5. Dorsal view. The Pliocene of the Waccamaw beds, S. C., length
384 mm. (After Dall.)
6. Interior view of right valve. Plum Point.
69
MIOCENE, PLATE LXXVII.
MARYLAND GEOLOGICAL SURVEY.
MOLLUSCA—PELECY PODA.
PLATE LXXVIII.
PAGE
Bigsqe 2a 5 VENUS! MERORNARDAM ATG. cpletlelsteldteselsterebelclyeraichoteresatctetetensteleveyers 305
1. Interior of left valve. Plum Point.
2. Exterior of right valve. Same locality.
70
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXvVIII.
\ MOLLUSCA—PELECY PODA.
PLATE LXXIX.
Figs. 1, 2. VENUS PLENA (Conrad)
1. Interior of left valve. Governor’s Run.
2. Exterior of right valve. Same locality.
71
‘ , it,
eit ‘ bel’
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXIxX,.
MOLLUSCA—PELECY PODA.
PLATE LXXxX.
PAGE
Fig. 1. VENUS CAMPECHIENSIS var. CAPAX (Conrad) .............--..+.- 308
1. Exterior of right valve. Cordova.
Fig. 2. VENUS CAMPECHIENSIS Var. TETRICA (Conrad) ...........-..+.+. 307
2. Exterior of right valve. St. Mary’s River.
a
i=)
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXX.
\
\
\ —=>=
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 .<fopcuetsyss oie sstoheuersrelaie tons evetavenenersverevevetstanas 317
4. Exterior of right valve. Plum Point.
5. Interior of left valve. Same locality.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXXIV.
MOLLUSCA—PELECY PODA.
PLATE LXXXV.
PAGE
Bigs: 1:25. socaRpiasiGNOGRAW MAS Di vecssicrs evcls: wets rere: the| onsite eceeeret re ceremevorciereions 318
1. Exterior of right valve. Cove Point?
2. Interior of left valve of same individual.
Migs: 334." ISOCARDIA PRATERNIAN SAYA act sleislaislcciet rs) setae oie ieelehelel ereieenets Bulli’
3. Exterior of right valve. Jones Wharf.
4. Interior of left valve. Same locality.
~
i
MIOCENE, PLATE LXXXV.
MARYLAND GEOLOGICAL SURVEY
PELECYPODA.
MOLLUSCA
PLATE LXXXVI.
PAGE
Fig. 1. Carprum (CERASTODERMA) LAQUEATUM Conrad ................- 319
1. Exterior of left valve. Jones Wharf. x %
Fig. 2. Carprum (CERASTODERMA) LEPTOPLEURUM Conrad ............... 320
2. Exterior of right valve. Plum Point.
Fig. 3. Carpium (CERASTODERMA) CRATICULOIDE Conrad ................ 320
3. Exterior of left valve. Plum Point.
Fig. 4. CArpDIUM (CERASTODERMA) CALVERTENSIUM Dl. SP.........-20eee0% 3821
4, Exterior of right valve. Governor’s Run (lower bed).
Fig. 5. Carprum (CERASTODERMA) PATUXENTIUM ID. SP. ...........22000% 322
5. Exterior of right valve. White’s Landing.
Figs. 6a, 6b. Carprum (FRAGUM) MEDIUM Linné.....................-. 322
6a. Interior of right valve. St. Mary’s River. U. S. National
Museum.
6b. Exterior of the same valve.
Figs. 7a, 7b. Carpium (L&VICARDIUM) MORTONI Conrad................- 323
7a. Exterior of right valve. Jones Wharf. U.S. National Museum.
7b. Interior of the same valve.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXXVI.
MOLLUSCA—PELECY PODA.
PLATE LXXXVII.
Figs. 1-4. SonecarpIA (SPANIORINUS) COSSMANNI Dall ................. 323
1. Interior of right valve. Miocene of Virginia. U. S. National
Museum. (After Dall.)
la. Hinge of left valve. Same locality and collection. (After Dall.)
2. Interior of right valve. Cove Point.
3. Interior of left valve. Same locality.
4. Exterior of right valve. Same locality.
Rigs: bas obs | SPORTEDEA! WieIRCRTET DD DLL Mere ote aloielevareconrelebatelaisisletetereiarereitere 324
5a. Interior of right valve. Plum Point.
5b. Exterior of same valve.
Wig: 6.6 ASPORTRET As PRE X DAL) corte mists, crecetev shore) oie essnassclcvotocatlone Getcha neon eoRe 325
6. Interior of right valve. Miocene of Virginia. U. S. National
Museum. (After Dall.)
Mie ai) CSPORTELG Ay PETROPOLUTAINAY D)allUes trate lve) crateneherstenstrerersncisteneicienerensietelers 325
7. Interior of right valve. Petersburg, Virginia. U. S. National Museum.
(After Dall.)
Missi S-f0) a SPORMEELAVRECHESSA\ MMISDi metals stnetaevarerecelseelcieveisteicuneherersion sictare 326
8. Interior of left valve. Cove Point.
9. Exterior of left valve. Same locality.
10 Interior of right valve. Same locality. U. S. National Museum.
Nig le ORORTM RAMP AMUN NOLAMIIEGS Deret-rerelelereleielererterciskeretenstet sme terstetcfereieretsrave 326
11. Interior of right valve. Cove Point.
lntsss WP AAlR YS Tsboxplsoine cua e IDEN eco conde souccuonosouoDOUDCanoOOD 326
12a. Interior of left valve. St. Mary’s River.
12b. Exterior of same specimen.
13. Interior of left valve. Miocene of North Carolina. U. S.
National Museum.
Figs. 14, 15. ERycrmna (PSEUDOPYTHINA?) AMERICANA Dall.............. 329
14. Exterior of right valve. Calvert Cliffs. U. S. National Museum.
(After Dall.)
15. Interior of left valve. Same locality and collection. (After
Dall.)
Hig: 16; > 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. <tcc chats eters eastauchenmycuey ccepee epee teremcnstonets 329
5. Interior of right valve. Plum Point.
Higs! 96-85 BORNEAU MACTROIDES (CONTA) iter -\eteteeeseiersy lees ete etree 330
6. Interior of left valve. Dover Bridge.
7. Exterior of right valve. Same locality.
8. Interior of right valve. Same locality.
S83 9a Ds BORNTAUDR TANG UIZAs Poller oyeretcteledetaleyeletetatcheycleraticietetetsrslonelicietstene 330
9a. Interior of right valve. Three miles west of Centerville.
9b. Exterior of same valve.
Hizs 10h) (BORNTASMARVTANDIGACTI.o SDs roc-teretelcerstexcucka icra ene eneholerencketer eucuensieeerens 330
10. Interior of right valve. Greensboro.
His tell.) BORNTA: DEPRESBSAl Mie: SPy a arciccectecersal tel puccopedaie urs Cores tesecederatacoueis oleae 331
11. Interior of right valve. Plum Point.
Hies.712; V3) KEE RORUNDUEAW M.S ‘SDs cyteeneterorue are cue aeieints ee orereteteree er Bel
12. Interior of right valve. Governor’s Run.
13. Interior of left valve. Same locality.
Figs. 14-18. Turcoponta (DICRANODESMA) CALVERTENSIS 0. Sp. ......... 332
14. Interior of right valve. Plum Point.
15. Interior of left valve. Same locality.
16. Exterior of left valve. Same locality.
17. Interior of left valve. Plum Point. U. S. National Museum.
(After Dall.)
18. Interior of right valve. Plum Point. U. S. National Museum.
(After Dall.)
Mig. $19" MONTACUDA, “MARTA AS MAINS spel css ciate sieiteleltelsialetevelsietes steyelletecntel auevelekers 332
19. Interior of right valve. St. Mary’s River or Plum Point. U. S.
National Museum. (After Dall.)
Figs. 20, 21. ALicENA @QuATA (Conrad)........... FO ASE OT OMe OS 333
20. Exterior of left valve. Jones Wharf.
21. Exterior of right valve. Same locality.
80
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXXvVIII.
MOLLUSCA—PELECY PODA.
PLATE LXXXIX.
Bigs) 1-35) sAmiGrnAu AQUA Am (COMTAG)) ecm cren ret sieieta hel ctstcbelofelenerateeleletel-veiay=t- 333
1. Interior of left valve. Jones Wharf.
2a. Interior of left valve. Miocene of Virginia. U. S. National
Museum. (After Dall.)
2b. Exterior of the same valve. (After Dall.)
3. Interior of right valve. Miocene of Virginia. U. S. National
Museum. (After Dall.)
IME i AAAI EON VE aponyN IDEA RR oa aecocoepooUDOobUADooUoULSE 333
4, Exterior of right valve. Plum Point.
Migs iba. bbs -AiIGHNAWPUSTUGOS AueD sill Nore roy etal sterol tere lelelel tere lenatetey=estaaotekstst=ta = 334
5a. Interior of left valve. Oligocene of Oak Grove, Florida. U. S.
National Museum. (After Dall.)
5b. Exterior of same specimen. (After Dall.)
Wigs: 6a, 6b: DIPLODONTA AGCLINIS Conrad - een. ce cee eres eens 334
6a. Interior of right valve. Caloosahatchie beds. U. S. National
Museum. (After Dall.)
6b. Exterior of same valve. (After Dall.)
Figs. 7, 8. DIPLODONTA SHILOHENSIS Dall ........--2.- 2-2. e esses ewes 335
7. Exterior of left valve. Jones Wharf.
8. Interior of right valve. Same locality.
Figs. 9, 10. DimeLoponTA SUBVEXA (Conrad) ...-....................---- 335
9. Interior of right valve. Flag Pond.
10. Exterior of left valve. Same locality.
81
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE LXXXIX.
MOLLUSCA—PELECYPODA.
PLATE XC.
Figs. 1, 2. PHAcoIDES (PSEUDOMILTHA) FOREMANI (Conrad) ........... 336
1. Interior of left valve. Plum Point.
2. Exterior of right valve. Same locality.
Figs. 3, 4. PHacormpEs (PSEUDOMILTHA) ANODONTA (Say)........esee--s> 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, </cpsrctevators\e1c tevain © s)oy(o1evere) oral ole ovevercreicreve eile 359
3. Interior of broken valve. Cove Point.
Rigt 4.. THRAGCTA CONRADIS COULHOUYi io oocee crs oeieie See Ce eee mine 359
4. Exterior of left valve. Plum Point.
Migs. 57.6. MARGARITARTA ABRUPTA (Conrad) :\....<-i1s cnere eee eieilsieinie 361
5. Exterior of right valve. Yorktown, Virginia.
6. Interior of left valve. Same locality.
Ihe a(t, ee np O (Uap mon avA)) IU IDEMUL GS clo ogeconpaoopcadooutoaasoos 358
7. Exterior of left valve. St. Mary’s River (?). U. S. National
Museum. (After Dall.)
Migs 8: — DIVARICELLA QUADRISULCATA (d'Orbieniy,)) secasase soceeeeeacieete 341
8. Exterior. Petersburg, Va. U. S. National Museum. (After
Dall.) xX1%
87
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XCV.
MOLLUSCA—PELECYPODA.
PLATE XCVI.
PAGE
Bigs; dia} dibs MyriiosacONRADINU Sd) OLPISN ya aeieieiieleteeiereeiciaralciennceneiclone 362
la. Exterior of right valve. Plum Point. x %.
1b. Interior of same valve.
Figs. 2-4. MytTimus (MytmoconcHA) INCURVUS Conrad................. 363
2. Exterior of right valve with part of beak of left valve showing
beneath. Greensboro. xX %
3. Interior of right beak. Same locality.
4. Interior of left beak. Same locality.
88
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XCVI.
MOLLUSCA—PELECY PODA.
PLATE XCVII.
PAGE
igh ds WerrHOPHAGAS SUBATVEAT Ay CONTA Ginceyenisiaraststonetensciceioiereraieietenetcsnene 364
1. Exterior of right valve. Shiloh, New Jersey. Acad. Nat. Sci.,
Phila. (After Conrad. Amer. Jour. Conch., vol. II, pl. IV,
fig. IV.)
Mizy 2,00. JITHOPHAGA LONENSIS/D SD cs steve stexctersreini alee slelaietetoe iinet 364
2. Exterior of right valve. Jones Wharf.
3. Exterior of right valve. Same locality.
Pig: 3457 CRENELUASVIRTDAl MSDs. elect yevecversveveveresevare cre sravsieveratere ateteuslelane fevaverstexere 365
4. Specimen from Greensboro.
Hie bs CRENEL EAS GUBERNATOR TAS ESD siietelat-teriaciersiciet iste ct ociennskenet eter esters 365
5. Specimen from Governor Run.
Kigs,. '6;.%. Moprenus auc arent Comma dics crecers cicisile ecco eaiele soaiciere 366
6. Exterior of right valve. Dover Bridge.
7. Interior of beak portion of left valve. Cove Point.
Miess Sash: “VMOpIOLUS) VARGINICUSs (CONTAC!) mesic eieiclsteiacleretiierielerieiele 366
8a. Exterior of left valve. St. Mary’s River.
8b. Interior of same specimen.
Bigs. (9) 105 MOpIOLUS PDA SDs ices si crsictvoletietetorster-ver etaverehneie omen tetererens 367
9. Interior of right valve. Pawpaw Point.
10. Exterior of left valve of same individual.
Pigs: 127 VMOpIOLUSHIONENSIS: We) SDs serstescveineiete losers eloiets tevsielescietalereceretsistelele 368
11. Exterior of right valve. Jones Wharf.
12. Interior of left valve of same individual.
Migi13. MODIOGARTA \CURTA Is Siu cine ecilelel «sions cs elaecuetstere eicvaleteierareha crete 368
13. Exterior of right valve. Plum Point. Cornell University.
89
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XCVIilI.
MOLLUSCA—PELECYPODA.
PLATE XCVIII.
Biel CAN OMTAUSIMPIE SG OLDISUMY) ticrate cutter sisee hehel heverter everett teeta
1. Exterior of upper valve. St. Mary’s River.
Migss2-bs 0 AN ONGTAW A CULE AIAN GIN Clim rye raierstinretiereereieieteeaicie eye teers eee
2. Exterior of broken upper valve. Plum Point.
3. Exterior of lower valve. Jones Wharf.
4. Interior of lower valve. Same locality.
5. Exterior of lower valve. Same locality.
Mie 6. GuINcACPAPY REA (Comrade pce stcreiisiererich- eicieherstclstetcre reel neieeaertelete
6. Exterior of right valve. Plum Point.
Migssi-9.8 -ELICA TULA DENSATA CONTAC cjarticicicileteieialers epetetaitisiercieieteneiots
7. Interior of lower valve. Evans farm near Church Hill.
8. Exterior of upper valve. Same locality.
9. Exterior of upper valve. Same locality.
Figs. 10-12. Prcten (PECTEN) HUMPHREYSII Conrad ..............
10. Exterior of lower valve. Plum Point. x %,.
11. Exterior of another lower valve. Same locality.
12. Exterior of an upper valve. Same locality.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XCVIII.
fi
|
y
MOLLUSCA—PELECY PODA.
PLATE XCIX.
PAGE
Fig. 1. Pecren (AMUSIUM) MORTONI Ravenel ..................---..0:- 372
1. Exterior of right valve. Fort Thompson, Florida. U.S. National
Museum. xh
Hig, 2. .PECTEN (PSEDDAMUSIUNG) CERINUS Conrad! Soe a... cs cise ies «ers 373
2. Exterior of right valve. Plum Point.
Hig, 35 PEcren) (CHLANMYS)) COCGYMTELUS Al] Gaye oe cle cise cielo ird-taielesione 374
3. Exterior of left valve. Plum Point. (After Dall.)
Hie, 4. Preren (CHLAMYS) ROGERS Conrad, 3% 5 ccc. os siscicisscleietare craniove 375
4. Exterior of right valve. Near Skipton. U. S. National Museum.
Big. 'b.-PECTENA(CHEADNCYS))) CLIN TONIUS AY coo s)/ateretenctatoroieyeletateteterereusvehe terctalore 375
5. Exterior of right valve. James River, Virginia. x %
Fig. 6. PectreEN (CHLAMYS) MARYLANDICUS Wagmer.............ceeceees 376
6. Exterior of left valve. Jones Wharf.
91
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE XCIX.
MOLLUSCA—PELECY PODA.
PLATE C.
PAGE
igs 1 SP Rerane (CEA NEYS)) pe MEADISONEUS 1S ya cnrereustechciereitstarlenererelstetenelieielere 377
1. Exterior of left valve. Flag Pond. xh
IMs PE least ony (((Chsanavergs)) “apomonvstompqois) SERZ ooaaooocboodéboodceanaun0 378
2. Exterior of right valve. St. Mary’s River. x
Fig. 3. PECTEN JEFFERSONIUS Var. EDGECOMBENSIS Dall .................. 379
3. Exterior of left valve. St. Mary’s River. U. S. National
Museum. x%
Fig. 4. PECTEN JEFFERSONIUS Var. SEPTENARIUS Say ..........eeeeeeeees 379
4. Exterior of right valve. Petersburg, Virginia. U. S. National
Museum. x%
Figs. 5a, 5b. OSTREA SELLZFORMIS var. THOMASII (Conrad) ............. 380
5a. Exterior of type specimen. Charles county near the Patuxent
river. Acad. Nat. Sci., Phila.
5b. Interior of the same specimen.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE C.
MOLLUSCA—PELECY PODA.
PLATE CI
Figs. la, 1b. OSsTREA TRIGONALIS Conrad
la. Exterior of lower valve. Greensboro.
1b. Interior of the same valve. x %
Figs. 2-4. OSTREA CAROLINENSIS Conrad
2. Interior of lower valve.
8. Interior of upper valve.
Same locality.
4. Exterior of lower valve.
Same locality.
93
Governor Run.
PAGE
ie ter ohsaclei ede sehavenetscenctenateseterte 381
x %
RO ACTOS DOD REED o GOO 381
x %
x %
xX %
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE Cl.
MOLLUSCA—PELECYPODA.
PLATE CII.
PAGE
HiSSip leo ROSTREANPHRGRASS Au COMMA metyelerelleneleletis tener tetetisreat Recto et 382
1. Exterior of upper valve. Magruder Ferry. xy
2. Interior of lower valve. Same locality. xy
IMs Be WihonanyN Ie annGWN ((IDEMMENEE)) Gaocodso0csondogDadcccUdeOsODON 383
8. Exterior of right valve. Plum Point. x %
94
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE Cll.
MOLLUSCA—PELECYPODA.
PLATE CIII.
PAGE
Migs. (MELINA: MAXTELATA (IDOSDAVES))! <..2:..c.c.s.. csc) ntehercrsyescensotetererenererte heron 383
1. Interior of broken valve showing hinge and ligament grooves.
Jones Wharf. X %
MISS: 02) 43. 6 ATRIN AS EVARRISIT, EDATINS cyejsicie tension cisus cisrateretere eke re ioieiner eet aeeele 384
2. Exterior of right valve. Pawpaw Point. x %
3. Exterior of decorticated right valve. Jones Wharf. U.S. National
Museum. (After Dall.) x %
95
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE Clll.
MOLLUSCA—PELECYPODA.
PLATE CIV.
PAGE
Rise ae FADRIITA: PISCATOR TAI SPN fee ie ter ele cpesalie orale eta ieval sera lona [<\ ates leyaktte late etesenats 384
1. Exterior of right valve. Fishing Creek. x %
Figs: 2-3b. Arca (ScarmaARcaA) SUBROSTRATA Conrad .......-.5.--.+-5 «-- 385
2. Interior of right valve. Plum Point.
3a. Exterior of right valve. Same locality.
3b. Exterior of right valve. Same locality.
Mies4a, 4b; ARCA (SCAPHARGA,) SHLINTAN TS ISDE ovailerclemie tliat is ckelnelett serene 386
4a. Exterior of right valve. Jones Wharf.
4b. Interior of right valve. Same locality.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE Civ.
MOLLUSCA—PELECYPODA.
PLATE CV.
Hist TS ARca (SCAPHARGA)) JOGLISKAT Dalle. se acecreieiieiesieiiniete tel ieieioeicriene 386
1. Interior of left valve. Nomini Cliffs, Virginia. U. S. National
Museum. 56mm. (After Dall.) .
Migss/2-6;) VARGA (SCAPHARGA))! STANCINEA: (Say c.r--.c creicicisieiers ie eerereisieleietoiotet cls 387
2. Interior of left valve. Flag Pond.
8. Interior of left valve of short variety. Same locality.
4. Exterior of right valve. Same locality.
5. Exterior of right valve. Dover Bridge.
6. Interior of left valve. Peach Blossom Creek.
Rigs: fab. “ARO (SCAPHARGA)) -ARATAD Sayi. «c.-1sj0 croc see sluere o aicisiersiciereiers 388
7a. Interior of right valve. St. Mary’s River.
7b. Exterior of left valve. Same locality.
97
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CV.
= SS
Soy
apa PD TPA TAT NTE ADEN
caterer ea —
MOLLUSCA—PELECY PODA.
PLATE CVI.
PAGE
Migsi 2. CARGAM(SCAPHARGA)) IDONEAS Conmad’ se yueccryateiai-veloneltel-calstckner ie 389
1. Interior of left valve. St. Mary’s River.
2. Exterior of right valve. Same locality.
IMF By Che INO (NTN) aergoreM oR SEAY Boogopacosboseoeorocorcoonaoomne 390
3. Exterior of right valve. Darlington, South Carolina. Johns
Hopkins University.
4. Interior of left valve. Same locality.
Higs) 5; 6.) ARGAMCGBARBATIA)) (GCENDTENARTA (SA Yi cic crelcls) be otlelelcieenietooieenrsle 391
5. Interior of right valve. Jones Wharf.
6. Exterior of left valve. Same locality.
Hig 7. ARcA (@BARBATIA)) ILARYTANDICA Commad) eye erss)-clsrclelelelneloleieterale 392
7. Exterior of right valve. Plum Point. U. S. National Museum.
Rig. 8. “ARCA (CBARBATEA))) “VIRGINIA WAEDOI. cam stelenerein ms clescie renee oil eteiataien ie 392
8. Exterior of left valve of type specimen. Miocene of Virginia
(Nansemond River?) 84 mm. Wagner Free Inst. Sci. (After
Dall.)
98
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CVI.
MOLLUSCA—PELECYPODA.
PLATE CVII.
Migs: 1h 24 GLYCYMERISSPARTEES) 5 ((COMGAG) ier cle atctetlecte seer ei eeeitenene tates 393
1. Interior. 3 miles south of Fishing Creek. XxX 5/6
2. Exterior of opposite valve. Same locality. x 5/6
Bigs: si45 (GLY CYNERISSSUBOVAITAN (SB Ys) el.) ste crelerecreucnclertetel aialcbeletenen crete tetene tats 394
“3. Interior. Greensboro.
4. Exterior. Same locality.
ies: 55-84 em AGO TATA” (CONTA) nists erecicrs ee elclsiclslevarc icici tater verter oreierars 395
5. Exterior of left valve with coarse sculpture. Plum Point.
6. Interior of left valve. Same locality.
7. Exterior of left valve with very fine close-set concentric sculpture.
Same locality.
8. Exterior of left valve with very coarse sculpture. Same locality.
Riess (95 10> 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. <a ly
Mies .8-105 2 TEPRATTA (2)! REVERSAS MSD: ercve steteicroreis eistel overs reve eieteleseretereracerate . 426
8. Several zooecia of a specimen having ovicells. X 281%
9. Several zooecia of another specimen having ovicells. xX 281%
10. Several zooecia having boundaries unusually well defined.
X 28%
Big. dl. MIcRoPOREBEA: PRACT EAEAR TIE SP. cayece etx serel(oiel ois icreletalesers elevereveherotaln 415
11. Two zooecia of the specimens figured on Plate CXIII, Fig. 3.
xX 28%
Bigss12:.213 5 MicRoPpORELLA: \('2)) BEROLTATAS To rSDan cle eccye.c: aieleisiete lek eheicietelate 417
12. A zooecium and an avicularium. X 28%
13. Two zooecia with ovicells. x 281%
Bigs 14°) GAMPHIBUES TRUM AGELUUS! Me SDs \s/orcleiareterelsverstel cleretelecieterclarstatcieisteteians 414
14. View of a single zooecium and portions of several adjoining ones.
X 28%
Hig: 15; AMPHIBLESTRUM CONSTRICTUM (Te SDs. 2 .sjc<1<)-1-teleice)iai ojo eich niel eialetatere sieve 413
15. Several zooecia with ovicells. > 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 <eeiettetat eer 441
1. General view of a colony attached to a Orepidula_ shell.
Distance from top of uppermost corallite to lowest portion of
shell as placed in Fig. 52 mm. x about 134
2. View of interior of a calice to show septal dentations. < about 5
3. Enlarged view of costae. 5)
4. Calicular view. Se 5
Figured specimen in collection of Johns Hopkins University.
116
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXXIV.
COELENTERATA—ANTHOZOA.
PLATE CXXV.
PAGE
Figs. 1,2. ASTRANGIA (CG@MNANGIA) Conradi n. sp. ...........2cecceecess 442
1. General view of a specimen. Length 103 mm. x about 14
2. Several calices. < about 5
Figured specimen in collection of Wagner Free Institute of Science.
117
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXxXv.
COELENTERATA—ANTHOZOA,
PLATE CXXVI.
Figs. 1-2. SmpraASTREA MARYLANDICA (Conrad) encrusting young, de-
scribed by Conrad as Astrea marylandica.............++-++
la, 1b. Two views of the same specimen. Greatest length of the
Pecten shell 112 mm. Note the protuberance that has been
formed.
2. Calices of another specimen. The “d”’s indicate dissepi-
ments, and show how new zoids are formed by dissepi-
mental budding. The calice at the bottom of the figure
has apparently divided by fission. The greatest distance
across the figured portion is 16 mm. x about 5
Figured specimens in collection of Johns Hopkins University.
118
PAGE
444
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXXVI.
COELENTERATA—ANTHOZOA.
PLATE CXXVII.
Wigs. 1-3. SEPTASTREA MARYLANDICA (Conrad) ................-«se+ees
1. Several calices of a specimen enlarged to show initiation of repro-
duction by dissepimental budding. Distance across the three
calices, 10 mm. x about 7
2. Calices of another specimen. A’, A”, young calices, but so far
advanced that one can not be sure which are the mother calices.
Immediately below A” is a young calice, apparently being
formed by dissepimental budding. paar
8. Calices of still another specimen, showing budding between the
corners of the calices. x about 6%
Figured specimens in collection of Johns Hopkins University.
119
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXXVI).
COELENTERATA—ANTHOZOA.
PLATE CXXVIII.
Bigs. 15 2) SEPTASTREAV MARY ANDICA™ (COMPA)! trccicieistoaicnialaicleretielerrersiets 444
1. General view of a specimen 67 mm. high.
2. Calices from specimens represented on Plate CXXIX. The large
calice shows incipient fission. x 5%
Figured specimens in collection of Johns Hopkins University.
120
MIOCENE, PLATE CXXVIII.
SS A ~ TA ‘
ee
COELENTERATA-—ANTHOZOA.
MARYLAND GEOLOGICAL SURVEY.
PLATE CXXIX.
SEPTASTREAY MARYE ANDICA™s (CONTAC) <tepeetyercie ecteiysoueketeieitsielsironeieecrener sein eters
General view of a specimen 175 mm. long, the figure slightly less than
natural size.
Figured specimen in collection of Johns Hopkins University.
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXXIX.
COELENTERATA—ANTHOZOA.
PLATE CXXxX.
PAGE
Mizsei.) (DISTEPHANUS) CRUS CM NrenDere)) epee eral tetalelelsteleteseraieteisronetats 448
1. Pileated piece of skeleton. Cambridge artesian well (192 to 395
feet). xX 375
2. Larger pileated piece of skeleton. Same locality. < 375
Rie 3.) SDICTYOCHA HIBULAN( 2) ME DEON DELS Were aa icreiistyersieiisteicleietlsierchlerercieie 449
3. Pileated piece of skeleton. Cambridge artesian well (192-395 feet).
x 375
Bigs 45q) LATHOCAMPE MAR YE ANDICAM TUS Demme yet ctavereteteielorctetellteretstanstersiel tekstas 450
4. Type specimen. Lyons Creek. x 187%
Nig. bo WUCYRTIDIMA CALVER TENSE NM EES Ds tee ei cieetelrataelststerenatete tor-)atetalalelaieteted 450
5. Type specimen. Lyons Creek. x 187%
Kigshi6s. STICHOCAPSAY MACROPORA, VATIASSAeveeicys a selelevelslerelersiehelstsvelsieeyersvels 451
6. A specimen from Richmond, Virginia.
7. Another specimen. Same locality.
Fig. 8. “ANTHOCYRTIOM DORONICUM Haeckel . 20.10.0220 cic creates waisivis asi cjelee 451
8. A specimen from Popes Creek. x 240
Fig: 9: LuIrHASTERISCUS; RADIATUS: HATenDerg oes isistevecwis winreisleiera'e cisveyeoiote 453
9. A specimen from Crisfield well (790 feet). x 225
Fig. 10. SPONGASTERISCUS MARYLANDICUS DN. SP. ...-.- 2. sce cece ees eseee 453
10. View of type specimen. x 90
Figs. 11-13. DicryocORYNE PROFUNDA HBhrenberg ..............+-0-+2000 454
11. A specimen from Lyons Creek. x 90
12. Another specimen. Same locality. x 90
18. Another specimen. Same locality. x 90
Fig. 14.. RHOPALODICTYUM MARYLANDICUM Dl. SP. .......-.eeees es eeerere 455
14. View of type specimen. Popes Creek. x 90
Hip lbs RAOPATODIOLYUMs CATVER TENSE i Spserveter: <icteyelererehsicrelctetererstereieterete 455
15. View of type specimen. Lyons Creek. x 90
Fig. 16. PoropIscUsS CONCENTRICUS (Ehhrenberf) .<....-..ccccccercacces 455
16. A specimen from Plum Point. x 162%
Migs eae MACODISCUS CARVER DAN US a iSDs) --feisiisiievelsveietsisisialclerieristeialsnetaiste 456
17. A specimen from Lyons Creek. x 131
Hisssee CAN NAR TID URBSD lily eleva) clareratieceier tierce iotekerienereyolete ke -iteloneletevenetemenenerels 456
18. A specimen from Popes Creek. x112%
Fig. 19. CANNARTISCUS AMPHICYLINDRICUS Haeckel ...................+% 457
19. A specimen from Richmond, Virginia. xX 195
Nig. 20, (CANNARTISCUS MARYEANDICUS, TY) (SD)e ccs cieicicc1ce els sre lo) w)-rs/stesieone/ aise 457
20. View of type specimen. Plum Point. x 187%
igs 21s ACANTHOSPELATRAN PARVIUTZAMVA SSA) «~ ee letevailate le) oles (ole sjeveietaleteveretetatat 458
21. A specimen from Popes Creek. x 195
Fig. 22: HEXATONCHE! MICROSPHZERA) VIDASSA) cc crc ete cre elec) cleisietein eleleraleeta 458
22. A specimen from Plum Point. x 131
Big: (23. CHEXASTWEUS STMPEER eV LIDASSGL ore cistever stacy acters cles cpsiiette: otetshemeratersiveneraee 459
23. A specimen from Lyons Creek. x 150
Figs. 24, 25. CENOSPHADRA POROSISSIMA ViNASSA .........cee recs ecneeee 459
24. A specimen from Lyons Creek. xX 131
25. Another specimen. Plum Point. 162%
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXXxX.
PROTOZOA—RADIOLARIA.
PLATE CXXXI.
PAGE
Figs. 1-3. NONIONINA SCAPHA (Fichtel and Moll) ...............-..--- 460
1. A specimen from Chesapeake Beach. x 52%
2. Another view of the same. xX 52%
38. Another specimen. Same locality. x 49
Fig. 4. PoLySTOMELLA STRIATOPUNCTATA (Fichtel and Moll) ............ 462
Jones Wharf. x 47
Hig) 5. SDESCORBINA ORBICULSRIS (‘Terquem))) S...1-4.- sae eeeeeeneeen. 463
Jones Wharf. xX 73
Fig. 6. PLANORBULINA MEDITERRANENSIS @’Orbigny ..............s-0-e+ 463
Chesapeake Beach. aoe
Figs. 7, 8. TRUNCATULINA LOBATULA (Walker and Jacob) .............. 464
7. Specimen from Jones Wharf. x 55%
8. Another specimen. Same locality. x 44
Bies39) Os SeRUONCATULINA VARFABINIS) Ge-Orbiciys ..eicteeiisnicrce cicero 465
9. Specimen from Jones Wharf. x 41
10. Another specimen. Same locality. xX 5814
Figs 115) sANOMALINA, GROSSERUGOSA ((GiIMDEl)) ohn creates e «ort lee eoneivaieteretets 466
Chesapeake Beach. x 50
Rigs? 12) 13. ROTARTA, BECOARTD (LINE)! qchecjercrevereseistere stetetera anata oases areas 467
12. Specimen from Cove Point. x 48
13. Another view of same ?.
Fig. 14. RoranrA BECCARIL var. BR@CKHIANA Karrer................+-.- 467
1 mile north of Governor Run. X 56
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXXxXI.
PROTOZOA—FORAMINIFERA,
PLATE CXXXII.
Figs. 1, 2, GtLoricertna BULLOIDES d’Orbigny
1. Specimen from Chesapeake Beach.
2. Another specimen. Same locality.
Fig. 3. GLOBIGERINA CRETACEA
Chesapeake Beach. x 60
d@Orbigny ...
Fig. 4. TEXTULARIA ABBREVIATA d’Orbigny ..
Governor Run. X 46
Fig. 5. TEXTULARIA AGGLUTINANS d’Orbigny
Governor Run. X 43%
40
42
Bigs. 654... “EEXPULARTA: ARTICUEATA NG OT DIEM: © «octet uate cele ere
6. Specimen from Chesapeake Beach. xX
7. End view of the same.
Figs. 8, 9. TEXTULARIA GRAMEN d’Orbigny ..
8. Specimen from Jones Wharf. X 34
9. Another view of the same.
Fig. 10. TExTULARIA CARINATA d’Orbigny ..
Chesapeake Beach. 45
52%
Bigs. 1, 122 (ReExToLARrTA, SAGITTULAVDCLTANCE a ra.jace eis, cists crete ace
11. Specimen from Plum Point. X 40%
12. End view of the same.
LM aie MN op cel ap eNO LOAN KC UAH AGUN GHOldont=Ihe Shuongudconnodondonupacds
Governor Run. X 48
Kies 14) BOLIVINA BEYRICHID VAT ALATA SCZUCNZAy cei. ciele ceicterersrei sieve tlereione
Chesapeake Beach. 47%
Fig. 15. CrIsTeLLArIA CULTRATA (Montfort)
Crisfield well (776 feet).
x 30
Fig. 16. CRIsTELLARIA WETHERELLII (Jones)
Crisfield well (776 feet).
X 261%
124
PAGE
468
469
470
470
471
473
473
474
MIOCENE, PLATE CXXXIl.
MARYLAND GEOLOGICAL SURVEY.
PROTOZOA—FORAMINIFERA.,
PLATE CXXXIII.
PAGE
Rieial Pony MORPH IN A IGOMPRESS Au dcOnDietiyasnt rary eiciestoneiieteniter anes 476
Chesapeake Beach. 41
Fig. 2. PoLYMORPHINA COMPRESSA Var. STRIATA Nl. Var. .......-.-----s-- 476
Type specimen. Jones Wharf. x 30
Fig. 3. PoLYMORPHINA ELEGANTISSIMA Parker and Jones ............... 476
Chesapeake Beach. X 4214
Piz: 4)” PonyworPr ur aiGrepa’ (dq: OEbigmy ls... yere.cm <a neierecier= clei interes 477
Chesapeake Beach. X 70
Figs. 5, 6. PoOLYMORPHINA LACTEA (Walker and Jacob)...............-. 477
5. Specimen from Jones Wharf. X 38%
6. Another view of the same.
Fig. 7. PoLyMORPHINA REGINA Brady, Parker and Jones................ 478
Chesapeake Beach. x 3914
Hig 8s UVIGHRINAN CANARTEN SIS) Gi Onbl2 tyr ctsrenci-rvete selec stenslsicust mveteyererrele sions 478
Crisfield well (776 feet). x 58
Mies Oe s AUVIGERINAS PY GMeac A) OlOLDISMy: verte reverent) sietslenensratectsretstets terol epensieenetete 479
Norfolk well (645 feet). x 28
His: 10t. (UVIGHRINA TENDISTRES TA REUSS! ieee ele acs cclocel core: « ais oiclereieuseneleneiene 479
Crisfield well (776 feet). x 38%
Bigot eS AGRI AV SPENOMS OTE R DD, Mesa inl ene iateretancterie eter en cren cansnecchetievelsis orale ieee reneiats 480
Type specimen. Jones Wharf. xX 388%
Hie e2: es MiETOLINAY SEMINULUM) (LITTLE) yyepccrcrenelscolstetelsicicicts cleteneleneictetehersee 481
Jones Wharf. X 33
Higy Los I SRIROLOCULINA TEN TES UC ZyZOK)) vo) oa: o)scetsterniaee etelcl era) s ietetsee) <isteiaietensiets 483
Leonardtown. X 52%
Mies 14. SSrmorocuuimay GRawa Terguemv.. .is< aeccleiemcieie «corres iorissenieeeioee 482
Chesapeake Beach. X 27
MARYLAND GEOLOGICAL SURVEY. MIOCENE, PLATE CXXXIll.
PROTOZOA—FORAMINIFERA,
PLATH CXXXIV.
PAGE
ACTINOCYCLUS ELLIPTICUS Grunow. X 33314..........-----++- 502
ACTINOCYLUS MONILIVoRMIS Ralfs. 3334g.........----++002- 502
ACTINOPTYCHUS HELIOPELTA Grunow. X 16634.............+---- 499
ActrnoprycHus UNDULATUS (Kiitzing). X 338314.........--.-- 499
AULACODISCUS ROGERSIT (Bailey). X 16636...........- -+--s5% 497
BmwpULPHIA AcUTA (Ehrenberg). X 33834%.........+-++-+++++5- 492
BIDDULPHIA CONDECORA (Ehrenberg). X 33384.......--.-+--++: 492
BIDDULPHIA DECIPIENS Grunow. X 38316.......-.+seee eee eeee 493
BIDDULPHIA INTERPUNCTATA (Grunow). X 333%......--.-+:-- 494
BIDDULPHIA SEMICIRCULARIS (Brightwell). X 38334..........-- 494
BIDDULPHIA SUBORBICULARIS Grunow. X 333%6.......--+-++-+> 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
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