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Full text of "Miocene"

Mai^yland 



Geological Surve 



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MARYLAND GEOLOGICAL SURVEY 



MIOCENE 
PLATES 



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mil, 



MARYLAND 



GEOLOGICAL SURVEY 



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i\X 



REMINGTON KELLOGG 

LIBRARY OF 
MARINE MAMMALOGY 

SMITHSONIAN INSTITUTION 



MIOCENE 

PLATES 



BALTIMORE 

THE JOHNS HOPKINS PRESS 

1904 



flT'itltitnim' 




It 



PRINTED BY 



^^e ^xkienrvali Company 



[iAl-TlMORE, MI)., U. S. 



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 
Maryland. 



PLATE X. 

PAGE 

Figs. 1-3. Squalodon atlanticus Leidy 6 

1. Portion of the right side of a jaw containing three teeth. Shiloh, 

N. J. Acad. Nat. Sci.. Phila. x % 

2, 3. Teeth from " Miocene of Maryland " labelled " Basilosaurus 

atlanticus." Acad. Nat. Sci., Phila. 

Pigs. 4, 5. Squalodon protekvus Cope 7 

4. Tooth. Charles County near the Patuxent River. Acad. Nat. 

Sci., Phila. 

5. Another tooth from the same locality and collection. 

Pig. G. PlUSCODELPIIINDS GABBI Cope 9 

0. Lumbar vertebra, lower view. Charles County near the Patuxent 
River. Acad. Nat. Sci., Phila. x % 

Figs. 7, 8. Priscodelphinus ruschenberqeri Cope 10 

7. Lumbar vertebra, lower view. Charles County. Acad. Nat. Sci., 

Phila. X % 

8. Caudal vertebra, lower view. Charles County near the Patuxent 

River. Acad. Nat. Sci., Phila. x % 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE X. 




MAMMALIA. 



PLATE XI. 

PAGE 

Figs. la-3b. Priscodelphintjs ( ?) crassangulum Case 12 

la. Inner view of tympanic bone. % mile north oi: Governor Run. 

X i-i 
lb. Outer view of the same specimen. X % 

2. Posterior view of left occipital region. Same locality and col- 
lection. X % 
3a. Upper view of lower jaw. Same locality and collection. x % 
3b. Upper view of upper jaw and anterior part of the head of the 
same individual with the occiput removed. Same locality and 
collection. x % 



MARYLAND' GEOLOGICAL SURVEY. 



MIOCENE, PLATE XI. 




MAMMALIA. 



PLATE XII. 

PAGE 

Figs, la-lc. Priscodelphinus geandaevus Leidy 15 

la. Specimen from % mile south of Chesapealce Beach. Maryland 

Geological Survey, 
lb. Another view of same specimen. 
Ic. Another view of same specimen. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XII. 






IVt.AMMALr.A. 



PLATE XIII. 

PAGE 

Figs, la, lb. IXACANTHus STENTS Cope 16 

la. Lateral view of lumbar vertebra. Charles County near the Patuxent 

River. Acad. Nat. Sci., Phila. x % 
lb. Posteri»F view of the same specimen. x % 

Figs. 2-4. IXACAXTHUs SPiKOSus Cope 17 

2. Lower view of a posterior lumbar. Charles County near the 

Patuxent River. Acad. Nat. Sci., Phila. x % 
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 % 

Figs. 5a-6. Ixaoaxthus ateopius Cope 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 % 
G. Lower view of a dorsal. Same locality and collection. x % 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XIII 




MAMMALIA. 



PLATE XIV. 

PAGE 

Figs. 1, 2. IXACAiS'THUs COELOSPONDYLUS Cope 19 

1. Lower view of a lumbar. Charles County near the Patuxent River. 

Acad. Nat. Sci., Phila. x % 

2. Lateral view of a lumbar. Same locality and collection. x % 

Fig. 3. Zakhachis flagellatob Cope 20 

3. Lower view of a lumbar. Charles County near the Patuxent 

River. Acad. Nat. Sci., Phila. x % 

Fig. 4. Cetophis heteroclitus Cope 23 

4. Lateral view of a lumbar. Charles County near the Patuxent 

River. Acad. Nat. Sci., Phila. x % 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XIV. 






I ft It :,,■.•!,■■. .■!, ,;'• • ' '7 '. . ■•>. 




MAMMALIA. 



\ 



PLATE XV. 

PAGE 

Figs. 1-5. Rhabdosteus latikadix Cope 24 

1. Lower view of rostrum. Charles County near the Patuxent River. 

Acad. Nat. Soi., Phila. x Vs 

2. Upper view of another rostrum. Same locality and collection. 

3a. Tooth from the anterior portion of the rostrum. x % 

3b. Another view of the same tooth. x 1/3 

4a. Another tooth. Same locality and collection. X % 

4b. Another view of the same tooth. X 1/3 

5. Another tooth. Same locality and collection. x % 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XV. 






§ 



1. 3b 4, 



MAMMALIA. 



PLATE XVI. 

PAGE 

Pigs, la-lc. LoPHOCETUs calvertensis (Harlan) 26 

la. Lateral view of skull. X % 
lb. Lower view of skull. x %, 
Ic. Upper view of skull. X % 
(after Harlan). 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XVI. 






MAMMALIA. 



PLATE XVII. 

PAGE 

Figs. 1, 2. Delphixodon mento Cope 28 

1. Anterior tooth. Charles County near the Patuxent River. Acad. 

Nat. Sci., Phila. x % 

2. Anterior tooth. Same locality and collection. ■ % 

Figs. 3-5. Delphinodon leidyi Hay 29 

3. Anterior tooth. Charles County near the Patuxent River. Acad. 

Nat. Sci., Phila. x % 

4. Anterior tooth. Same locality and collection. x % 

5. Anterior tooth. Virginia. Acad. Nat. Sci., Phila. x % 

Figs. Ga, 6b. Hypocetus atl.4.nticus (Cope) {A^?r)r^CiM'ys). 30 

6a. Upper view of skull. Drum Point. Johns Hopkins University. 

X Ve 
6b. Lower view of the same skull. x % 

Fig. 7. Orycterocetls ct.ocodeh.\us ( ?) Cope 32 

7. Anterior tooth. Charles County near the Patuxent River. Acad. 
Nat. Sci., Phila. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XVII. 




MAMMALIA, 



PLATE XVIII. 

PAGE 

Figs. l-2b. Metopocetus dueinasus Cope' 36 

1. Upper view of skull. Near the mouth ot the Potomac River. 
Museum of the Woman's College of Baltimore. X % 
So., Supraoccipital bone; Sq., Squamosal; Z., Zyzmatic; P., Parie- 
tal; F., Frontal; N., Nasal; Na., External nares; T. R., Tem- 
poral Ridge. 
2a. Anterior view of atlas vertebra. Same locality and collection. 

2b. Upper view of the same specimen. X % 



10 



MARYLA\D GEOLOGICAL SURVEY. 



MIOCENE, PLATE XVIII. 



/Vo. 




MAMMALI.\. 



PLATE XIX. 

PAOB 

Fig. 1. Cephaloteopis cokonatus Cope 39 

1. Upper view of sliull. Johns Hopliins University. x % 

So., Supraoccipital bone; P., Parietal; N.. Nasal; Mx., Maxillary; 
Pmx., Premaxillary; T. R., Temporal Ridge. 



* 

i 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XIX. 




MAMMALIA. 



PLATE XX. 

PAUE 

Pig. 1. Ceteothekium megalopiiy.sum Cope 41 

1. Upper view of sliull. Cove Point. Jolins Hopkins University. 
X % 
So., Supraoccipital bone; 8q., Squamosal; P., Parietal; F., Frontal; 

N., Nasal; Mx.. Maxillary. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XX. 



N. 




MAM II ALIA. 



PLATE XXI. 

PAGE 

Fig. 1. Cetotherium cephalvm Cope 44 

1. Humerus of right side. Shore of Chesapeake Bay. Johns Hop- 
kins University. 



13 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXI. 




M.\MM.\LI.\. 



PLATE XXII. 

PAGE 

Figs. la-2b. Cetotiierium cei-iialum Cope 44 

la. Vertebra. Charles County near the Patuxent River. Acad. Nat. 

Sci., Phila. X % 
lb. Another view of the same vertebra. x % 
2a. Another vertebra. Same locality and collection. x % 
2b. Another view of the same vertebra. X % 



14 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXII. 




MAMMALIA. 



PLATE XXIII. 

PAGE 

Figs. 1, 2. Cetotherium cephalum Cope 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, PI. XXII.) 

Pig. 2. Skeleton of Plalarusla, minus the fore limbs 44 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXIII. 




i 



i}> 




r'i^. 



H\ 



M.AMMALIA. 



PLATE XXIV. 

PAGE 

Figs, la, lb. Ulias moratus Cope ■ 50 

la. Outer view of lower jaw. Miocene of Maryland or Virginia. 

Johns Hopkins University. X % 
lb. Upper view of the same specimen. 

Fig. 2. Balaenopteka suksiplana Cope 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 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXIV. 




MAMMALI.\. 



PLATE XXV. 

PAGE 

Lettering: E. G., External gingival canal; I. G., Internal gingival canal; 
G.G., Gingival groove; D. C, Dental canal. 

Fig. 1. Cetotherium parvum Trouessart 44 

1. Section of left mandibular ramus. After Cope, Proc. Amer. 

Philos. Soc, Vol. XXXIV, PI. VI, Fig. 6. X Vs 

Fig. 2. Tretulias buccatus Cope 52 

2. Section of left mandibular ramus. After Cope, Proc. Amer. Philos. 

Soc, Vol. XXXIV, PI. VI, Fig. 2. X Va 

Fig. 3. SI^H0^'0CETUS expansxis Cope 45 

3. Section of left mandibular ramus. After Cope, Proc. Amer. Philos. 

Soc, Vol. XXXIV, PI. VI, Fig. 5. X Vs 

Fig. 4. SlPHONOCETU.9 CLARKEANUS Cope 47 

4. Section of left mandibular ramus. After Cope, Proc. Amer. Philos. 

Soc, Vol. XXXIV, PI. VI, Fig. 4. X 1/3 

Fig. 5. SiPHONOCETus PRiscus Leidy 46 

5. Section of left mandibular ramus. After Cope, Proc. Amer. Philos. 

Soc, Vol. XXXIV, PI. VI, Fig. 3. X % 

Fig. 6. Ulias 3I0RATUS Cope 50 

6. Section of left mandibular ramus. After Cope, Proc. Amer. Philos. 

Soc, Vol. XXXIV, PI. VI, Fig. 1. X 1/3 

Fig. 7. Cetotherium polyporum Cope 47 

7. Section of left mandibular ramus. After Cope, Proc. Amer. Philos. 

Soc, Vol. XXXIV, PI. VI, Fig. 7. X 1/3 

Fig. 8. Cetotherium cephalum Cope 44 

8. Section of mandibular ramus from Maryland, distal of the middle. 

After Cope, Proc Amer. Philos. Soc, Vol. XXXV, PI. XII, Fig. 
3. X 1/3 

Fig. 9. Rhegnopsis palaeatlanticus Leidy 45, 46 

9. Section of mandibular ramus from Virginia. After Cope, Proc. 

Amer. Philos. Soc, Vol. XXXV, PI. XII, Fig. 5. X Vs 

Fig. 10. Cetotherium leptocentrum Cope 47 

10. Section of mandibular ramus from Virginia. After Cope, Proc. 

Amer. Philos. Soc, Vol. XXXV, PI. XII, Fig. 1. X % 

Fig. 11. Cetotherium davidsonii Cope 34 

11. Section of mandibular ramus from California. After Cope, Proc. 

Amer. Philos. Soc, Vol. XXXV, PI. XII, Fig. 4. X 1/3 

Fig. 12. Mesocetus siphunculus Cope 34 

12. Section of mandibular ramus from Virginia. After Cope, Proc. 

Amer. Philos. Soc, Vol. XXXV, PI. XII, Fig. b. 

Fig. 13. Cetothekium cephalum Cope 44 

13. Section of mandibular ramus represented in Fig. 8, proximal of 

the middle. After Cope, Proc Amer. Philos. Soc, Vol. XXXV, 
PI. XII, Fig. 2. X 1/3 

17 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXV. 



EG^IG 












PLATE XXVI. 

PAGF. 

Fig. 1. Teichechus gig.\nteus (?) ( De Kay) 56 

1. Radius and ulna. Fairhaven. x % 

Fig. 2. SuLA LoxosTYLA Cope 58 

2. Coracoid. Calvert Cliffs. American Museum of Natural History. 

X% 

Figs. 3, 4. PuFFiNus coNRADi Marsh 60 

3. Distal portion of right humerus. Miocene of Maryland. Acad. 

Nat. Sci., Phila. 

4. Distal portion of right ulna. Same locality and collection. 

Fig. 5. CiiELONE sp 64 

5. Proximal portion of scapula. Plum Point. X % 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXVI, 




MAMMALIA, A\'ES A\n REPTILIA. 



PLATE XXVII. 

PAGK 

Pigs. 1, 2. Thecaciiampsa ( ?) sericodon Cope 65 

1. Tooth. Charles County near the Patuxent River. Acad. Nat. Sci.. 

Phila. 

2. Tooth. Same locality and collection. 

Figs. 3-5. TiiECACHAMPSA (?) sicARiA Cope 66 

3. Crown of a tooth. (After Cope.) x % 

4. Portion of lower jaw. (After Cope.) x % 

5. Another view of the same. (After Cope.) x % 

Pigs. Ca, 6b. Thecachampsa ( ?) coxtusor Cope 66 

6a. Lateral view of tooth. Charles County near the Patuxent River. 
6b. Basal view of the same specimen. 

Pigs. 7-9. Thecachampsa (?) astiqua (Leidy) 67 

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 % 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXVII. 






REPTILIA. 



PLATE XXVIII. 

PAGE 

Figs, la, lb. Squatina occidentalis n. sp 71 

la. Outer face of tooth (type specimen) showing downward prolonga- 
tion of the enamel below the base of crown. Plum Point. 
X 4/3 
lb. Inner face of the same specimen. 

Fig. 2. Raja { ?) dux Cope 72 

2. Superior aspect of a detached and considerably abraded dermal 
tubercle. (Type specimen.) Charles County near the Patuxent 
River. Acad. Nat. Sci.. Phila. 

Figs. 3a, 3b. Myliobatis gigas Cope 73 

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). 



20 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXVIII. 





PISCES. 



PLATE XXIX.. 

PAGE 

Figs, la, lb. Myliobatis gigas Cope 73 

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. la). 

Figs. 2a, 2b. Myliobatis paciiyodon Cope 75 

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. 

Fig. 3. Myliobatis fkangens n. sp 75 

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. 

Fig. 4. Myliobatis or Trygon (?) sp 92 

4. Portion of large caudal spine of an eagle or sting-ray. Charles 

County near the Patuxent River. Acad. Nat. Sci., Phila. 

Fig. 5. AicTOBATis arcuatus Agassiz 76 

- 5. Inferior aspect of fragmentary tooth. St. Mary's River. 

Figs. 6a, 6b. Notidanus rRi.MioENius Agassiz 77 

6a. Inner aspect of tooth, the root much worn away. Plum Point. 
6b. Outer aspect of the same specimen. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXIX. 








i,ll"i '■"""'iii'ii Mij"p,^.r%, 





',!i5 




PISCES. 



PLATE XXX. 

PAGE 

Figs, la, lb. Odontaspis cuspidata ( Agassiz) 78 

la. Outer face of a tooth showing a rudimentary second pair of 

lateral denticles. St. Mary's River. x 4/3 
lb. Inner face of the same specimen. x 4/3 

Pigs. 2a, 2b, 3. Odontaspis elegans (Agassiz) 79 

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 DESOKii Agasslz 79 

4. Inner face of a moderate-sized tooth. Charles County near the 

Patuxent River. Acad. Nat. Sci., Phila. 

Figs. 5a-6c. Oxyrhina hastalis Agassiz 80 

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. 
Gb. Profile of the same specimen. 
6c. Inner face of the same specimen. 

Fig. 7. Oxyrhina sillimani Gibbes 81 

7. Outer face of an average-sized tooth. Fairhaven. 

Figs. 8, 9. Otodus obliquus Agassiz 82 

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. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXX. 








PISCES. 



PLATE XXXI. 

PAGE 

Figs. la-3. Carciiarodox jiegalodo.x (Charlesworth) S2 

la. Inner face of an anterior tootli witli slender, erect crown. Plum 

Point, 
lb. Profile of the same specimen. 
Ic. 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. Verteural iextriji of Carcharouox sp 82 

4a. Vertebral face. Plum Point. 

4b. Hjemal aspect of the same specimen. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXXI. 




PISCES. 



PLATE XXXII. 

PAGE 

Fig. 1. Carch ARIAS (Prioxodon) egertoni (Agassiz) 84 

1. Inner face uf a well-preserved spefimen of average size. C'barles County 

near the Tatuxent River. Acad. Nat. Soi., Phila. 

Fig. 2. Carcharias laevissimus (Cope) 84 

2. Inner face i^f a tooth. Fairhaven. 

Figs. 3-5. Carcharias collata n. sp. (Ex. Cope MS) 85 

3a. Outer face of a posterior tooth with expanded root. iType 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 cariniie. 
(Type specimen.) Acad. Nat. Sci., Phila. 

4b. Inner face of the same specimen. 

o. Inner face of an average-sized tooth with prominent root. (Type speci- 
men.) Charles County near the Patuxent River. Acad. Nat. Sci., 
Phila. 

Figs. 6, 7. Carcharias magna (Cope) 86 

Ga. 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. 
7b. Inner face of the same specimen. 

Fig. S. Carcharias ixcidexs n. sp 87 

S. Inner face of the type specimen. Chesapeake Beach. 

Figs. 9a, 9b. Galeocerdo contortus Gibbes 87 

Oa. Outer face of a specimen slightly above the average size. Fairbaven. 
Dlt. Inner face of the same specimen. 

Fig. 10. Galeocerdo latidexs Agassiz 88 

in. Inner face of an average-sized tnoth. Charles County near the Patuxent 
River. Acad. Nat. Sci., Pbiia. 

Fig. 11. Galeocerdo aduncus Agassiz 88 

11. Inner face of an averaged-sized tooth. Plum Point. 

Fig. 12. Galeocerdo triqueter n. sp 89 

I'J. Inner face of the type and only known specimen. Charles County near 
the I'atuxent River. Acad. Nat. Sci.. Pbila. 

Figs. 13, 14. Hemipristis serra Agassiz 90 

13a. Outer face of a medium-sized anterior tooth. Popes Creek. 

i;ib. 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. 

Fig. 15. Sphyrna prisca Agassiz 91 

IT). Inner face of a large-sized, perfectly preserved specimen. Plum Point. 

Fig. 16. Sphyr-ena speciosa Leidy 92 

IG. Crown of fragmentary laniary tooth. Charles County near the Patuxent 
River. Acad. Nat. Sci.. Phila. 

Figs. 17-19. Otolites of Teleost Fishes 93 

Inner, outer and side-views of otolites. St. Mary's River, x % 



24 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXXII. 





4b 







11 




12 






15 



16 






PLATE XXXIII. 

PAGE 

Figs. 1-6. Balaxvs concavvs Brown 94 

1. Lateral view of large specimen. Jones Wharf. 

2a. Scuta and terga. St. Mary's River. 

2b. Lateral view of the same. 

3a. Exterior of left scutum. 

3b. Interior of the same. 

4a. Interior of right scutum. 

4b. Exterior of the same. 

5a. Exterior of right tergum. 

5b. Interior of the same. 

6a. Exterior of left tergum. 

6b. Interior of the same. 



25 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXXIII. 












ARTHROPODA CIRRIPEDIA. 



PLATE XXXIV. 

PAGE 

Figs. 1-7. Balanus concavus Brown 94 

1. Interior of left lateral compartment of original of Plate XXXIII, 

Fig. 1. 

2. Interior of rostrum of the same. 

3. Interior of right lateral compartment of the same. 

4. Interior of right carino-lateral compartment of the same. 

5. Interior of carina of the same. 

6. Interior of left carino-lateral compartment of the same. 

7. Basis of the same. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXXIV. 




<Ja(!*;,2^* 



.\RTHROPOD.\ CIRRIPEDI.\. 



PLATE XXXV. 

PAGE 

Pigs. 1-10 Cythere clarkaxa n. sp 9S 

1. Rather short left valve. Plum Point. U. S. Nat. Museum. 

2. A left valve of the average length and dimensions. Same locality. 

3. Unusually elongate right valve. Same locality. 

4. Rather short right valve, without spines on either end. Same 
• locality. 

5. Dorsal view of a large specimen. Same. 

6. Right side of entire carapace differing slightly in outline from 

the usual form. 

7. Dorsal view of another specimen. 

S. 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. 

Pigs. 11-14. Cytheke claskana var. mi.nuscula n. var 99 

11, 12. Two left valves of this variety. 

13. A right valve, somewhat doubtfully referred to this variety. 

14. Interior of the largest left valve seen. 

Figs. 15-17. Cytheke ix.icquivalvis n. sp 101 

15. The left or larger valve. Plum Point. 

IC. The smaller and quite differently shaped right valve, Same 

locality. 
17. Interior of another right valve. 

Pigs. 18, 19. Cythere plebeia var. modica n. var 103 

IS, 19. Two left valves of this variety differing somewhat in outline. 
Plum Point. 

Pigs. 20-29. Cythere plebeia n. sp 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 Pig. 28. 

Pigs. 30-33. Cytheke plebeia var. c.apax n. var 103 

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. 
Two right valves. Plum Point. 
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. 



:s. 3 


0-33, 


30. 




31, 


32. 


33. 





27 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXXV. 







m 




2TSf *^'f??'*"" 








10 




r.A-; 




11 



12 




13 




14 





17 




18 







22 




ail*«^^ 



24 





26 




27 




•^^ 



29 






31 33 

ARTHROPODA — OSTRACODA. 




PLATE XXXVI. 

PAGE 

Figs. 1-5. Cythere exanthemata n. sp 117 

1. 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. 

Figs. 6-8. Cytiiere kvax n. sp 119 

6. Rather short right valve. 

7. Left valve. 

8. Another right valve. 

Figs. 9, 10. Cythere evax var. orloxgata n. var 119 

9. Right valve. Plum Point. 
10. Left valve with surface ornament obsolescent probably due to 
age. 

Figs. 11-15. Cythere maktixi n. sp 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. 

Fig. 16. Cythere dorsicornis n. sp 116 

16. The left valve upon which this variety is founded. Plum Point. 

Fig. 17. Cythere producta n. sp 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. 

Figs. 18-20. Cythere micula n. sp 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 borders that are scarcely visible at this 
magnification. 

Figs. 21-23. Cythere xitidula n. sp 107 

21. 22. Two left valves showing slight differences in outline. Plum 

Point. 

23. 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 xitidula var. calvertensis n. var 108 

24. A left valve of this variety or species. 

25. A right valve referred to this variety or species with some doubt. 

Figs. 26-33. Cythere porcella n. sp 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. 

33. Interior of a right valve of the normal form. 

Figs. 34-39. Cy'there durnsi n. sp 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 all magnified 20 diameters and the specimens 
are all from the Calvert formation at Plum Point, Md. 



MARYLAND GEOLOGICAL SURVEY. 






M 



MIOCENE, PLATE XXXVI. 



4 












14 




16 




17 



18 



19 



30 






23 




25 





27 




28 




29 



30 



31 








36 






ARTHROPODA — OSTRACODA. 



PLATE XXXVn. 

PAGE 

Figs. 1-8. CVTHERIDEA SUBOVATA n. SP 124 

1. 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. Cytheridea ( ?) chesapeakensis n. sp 125 

9. A right valve of this species. Plum Point. 

Figs. 10-16. Cytherideis ashermani n. sp 126 

10. Rather large left valve. Surface pitting indistinct. Plum 

Point. 

11. A small right valve. 

12. 13. Two small left valves. 

14. Interior of a large right valve. 

15. 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. 

Pig. 17. Cytherideis cylixdrica n. sp 126 

17. A left valve. Plum Point. 

Figs. 18-20. Cy'theriueis semicircularis n. sp 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. 

Figs. 21-27. Cytherideis longula n. sp 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. 

27. 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. Cytherideis sub-equalis n. sp 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. 

Pigs. 29-33. Cythereis cornuta var. Americana n. var 122 

29. Dorsal view of a left valve. 

30-32. Three left valves showing the extremes of variation observed 

in the Maryland specimens. 
33. A right valve. 



Excepting Pigs. 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 XXXVll. 



(^ 












10 



11 



13 



13 




14 



15 



16 



18 



19 



■'•-■ :.v;?a 
20 



21 



22 



23 



25 



26 




c> 



30 





31 32 

ARTHROPODA — OSTRACODA. 




33 



PLATE XXXVIII. 

fiOE 

Figs. 1-3. Cythere planibasalis n. sp 99 

1. Lateral view of a risht valve. James River. Virginia. 

2. Posterior view of the same. James River. Virginia. 

3. Ventral view of the same. James River, Virginia. 

Figs. 4-6. Cythere tuomeyi n. sp 105 

4. Lateral view of a left valve X 25^^. Yorktown. Va. 

o, 0. Lateral views of a right valve X 2.5^1 and X 13Mi. apparently of the same 
species. Peach Blossom Creek, 3 miles southwest of Easton. 

Figs. 7-9. Cythere paucipunctata n. sp 105 

7. Lateral view of a left valve. Peach Blossom Creek. 
s, 9. Posterior and ventral views of same in outline. 

Fig. 10. Cythere ( ?) shattucki n. sp 121 

10. Lateral view of a left valve. Pawpaw Point. 

Pigs. 11-13. Cythere calvebti n. sp 100 

11-13. Lateral, anterior and ventral views of a left valve. Plum Point. 

Figs. 14-15. Cythere subovalis n. sp Ill 

14. l."». Lateral and ventral views of a left valve. Pawpaw Point. 

Figs. 16, 17. Cythere rugipunctata n. sp 118 

10. 17. Lateral and dorsal views of a left valve. James River, Virginia. 

Fig. 18. Cythere spiniplicata n. sp 120 

15. Lateral vie,w of a right valve. Plum Point. 

Figs. 19-21. Cythere francisca n. sp 110 

in. 20. Two lateral views of a right valve X 25',^ and X 13',3. Peach Blossom 
Creek. 

21. Ventral view of same. 

Figs. 22-24. Cythere punctistriata n. sp 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. 

Figs. 25-27. Cythere vaughani n. sp 109 

2.5-27. Lateral, posterior and ventral views of a right valve. James River, 
Virginia. 

Pigs. 28-30. Cythere producta n. sp. ( see also Plate XXXVI ) 115 

28, 29. Lateral and ventral views of a riglit valve. Plum Point. 

30. Well-preserved right valve differing slightly iu surface markings. 

Plum Point. 

Fig. 31. Cythere lienenklausi n. sp 114 

31. Lateral view of a left valve. Plum Point. 

Pigs. 32, 33. Cythere doksicobnis bicornis n. sp. et var 114 

32. 33. Two lateral views of a left valve X 13Mi and X 2.51/3. Pawpaw Point. 

Figs. 34-36. Cythereis alaris n. sp 123 

34-36. Lateral, posterior and dorsal views of a left valve. James River, 
Virginia. 

Figs. 37-40. Cythebopteron nodosum n. sp 129 

37-40. Two lateral, a ventral and a posterior view of a right valve X 25% and 
X 13%. James River, Virginia. 



Unless stated otherwise all the figures on this plate are magnified 13% times. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXXVIII. 







12 




10 



13 








31 



ao 





39 



36 



35 



S7 




24 





3S 



31 




88 





40 



ARTHROPODA OSTRACODA. 



PLATE XXXIX. 

PAGE 

Fig. 1. Nautilus sp 130 

1. View of exterior of peripheral portion of a septum. Plum Point. 

Cornell University. 

Fig. 2. AcT.EON ovoiDES Conrad 131 

2. Ventral view. Cove Point. 

Fig. 3. AcT.EON PUSILLUS ( Forbes) 132 

3. Ventral view. St. Mary's River. 

Fig. 4. AcT.EON SHiLOHE^'sis AVliitiield 132 

4. Ventral view. Cove Point. 

Fig. 5. ACT.EON CALVERTENSIS n. sp 133 

5. Ventral view. Plum Point. Cornell University. 

Fig. G. VoLviLA IOTA (Conrad ) var. marylandica n. var 134 

6. Ventral view. Cove Point. 

Fig. 7. Volvula iota (Conrad) var. diminuta n. var.. . .' 134 

7. Ventral view. Cove Point. 

Fig. 8. Volvula iota (Conrad) var. calverta n. var 135 

8. Ventral view. Plum Point. 

Fig. 9. Volvula iota (Conrad) var. patuxentia n. var 135 

9. Ventral view. Jones "Wharf. 

Fig. 10. RETU.SA (Cylichnixa) marylandica n. sp 135 

10. Ventral view. St. Mary's River. 

Fig. 11. Retusa (Cylichnixa) conulus (Deshayes) 136 

11. Ventral view. Plum Point. 

Fig. 12. Retusa (Cylkh.xina) subspissa (Conrad) 136 

12. Ventral view of type. Calvert Cliffs. Acad. Nat. Sci., Phila. 

Fig. 13. Cylichna ( ?) greensboroensis n. sp 137 

13. Ventral view. Greensboro. 

Figs. 14, 15. Cylichna calvertensis n. sp 137 

14. Ventral view. Plum Point. 

15. Ventral view of less elongate specimen. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XXXIX. 


















MOLLUSCA — CEniALOPODA AND GASTROPODA. 



PLATE XL. 

PAGE 

Pigs. 1, 2. Terebea unilineata Conrad 138 

1. Ventral view of fragment. Plum Point. 

2. Ventral view. Duplin County, North Carolina. 

Pigs. 3, 4. Tekebra (Acus) curvilineata Dall var. whitfieldi n. var.139, 140 

3. View of one of the types of T. curvilineata Whitfield. Jericho, 

New Jersey. U. S. National Museum. 

4. Ventral view. Plum Point. 

Fig. 5. Terebra (Acts) curvilineata Dall var. dalli n. var 139, 140 

5. Ventral view. Greensboro. 

Figs. C, 7. Terebra (Acus) curvilineata Dall var. cai.vebtensis n. 

var 139. 141 

6. View of fragment showing typical sculpture. Plum Point. 

7. Ventral view of more complete specimen. Same locality. 

Fig. 8. Terebra (Acus) curvilirata Conrad 141 

8. Ventral view. St. Mary's River. 

Fig. 9. Terebra (Acus) sincera Dall 142 

9. Ventral view of type. St. Mary's River. U. S. National Museum. 

Fig. 10. Ticuebka (Hastula) si:mplex Conrad 143 

10. Ventral view. St. Mary's River. 

Fig. 11. Terebra (Hastula) simplex Conrad var. sublirata Conrad... 144 

11. Ventral view. St. Mary's River. 

Pigs. 12, 13. Terebra (Hastula) i.nornata Whitfield 144 

12. Ventral view of a small specimen. St. Mary's River. 

13. Same view of a larger specimen showing revolving striae. Same 

locality. 

Fig. 14. Terebra (Hastula) patuxentia n. sp 145 

14. Ventral view. Jones Wharf. 

Figs. 15-17. Coxus diluvianus Green 145 

15. Ventral view of large specimen. St. Mary's River. 
IC. Ventral view of young individual. Same locality. 

17. Ventral view of abnormal specimen. Same locality. Cornell 
University. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XL. 










mm 



10 








r 



X-4t 







16 



MOLLUSCA — GASTROPODA. 



PLATE XLI. 

PAOE 

Fig. 1. Pleukotoma (Hemipleurotojia) albida Perry 146 

1. Ventral view. Jones Wharf. 

Figs. 2, 3. Pleueotoma (Hemii'leukotoma) communis Conrad 147 

2. Ventral view of adult individual. Cove Point, 

3. Ventral view of young individual. Same locality. 

Figs. 4-6. Pleurotoma (HEMiPLEtRoxoMA) COMMUNIS Conrad var. pro- 

TocoMMUNis n. var 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. Pleurotoma (Hemipleurotoma) choptankensis n. sp 148 

7. Ventral view. Jones Wharf. 

Figs. 8, 9. Pleurotoma (Hemipleurotoma) bellacrenata Conrad 148 

8. Ventral view of adult individual. Plum Point. 

9. Ventral view of young. Same locality. Cornell University. 

Figs. 10, 11. Pleurotoma (Hemipleurotoma) calvektensis n. sp 149 

10. Ventral view. Plum Point. 

11. Ventral view showing the other extreme in sculpture. Same 

locality. U. S. National Museum. 

Figs. 12a, 12b. Sukcula eugata Conrad 149 

12a. Ventral view. Jones Wharf. 
12b. Dorsal view of same specimen. 

Fig. 13. Surcula marylandica Conrad 150 

13. Ventral view. Plum Point. 

Fig. 14. Sukcula biscatenaeia Conrad 151 

14. Ventral view. St. Mary's River. 

Fig. 15. SuECULA engonata Conrad 151 

15. Ventral view. St. Mary's River. 

Pig. 16. SuECULA ROTIFERA Conrad 152 

16. Ventral view. St. Mary's River. 

Fig. 17. Surcula mariana n. sp 152 

17. Specimen from St. Mary's River. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XLI. 




MOLLUSCA — GASTROPODA. 



PLATE XLII. 

PAGE 

Figs. 1,2. Manoilia paeva ( Conrad ) 153 

1. Ventral view. Cove Point. 

2. Ventral view. Langley's Bluff. 

Pig. 3. Mangilia pakvoidea n. sp 154 

3. Ventral view. St. Mary's River. 

Fig. 4. Manoilia cornelliana n. sp 154 

4. Ventral view. Plum Point. Cornell University. 

Fig. 5. Manoilia patuxentia n. sp 154 

5. View of specimen from Jones Wharf. 

Fig. 6. Mangilla (Glyphcstoma) obtusa n. sp 155 

6. Ventral view. Plum Point. 

Fig. 7. Drillia incilifera (Conrad) 155 

7. Ventral view. Cove Point. 

Fig. 8. Drillia incilifera var. anqulata n. var 156 

8. Ventral view. St. Mary's River. 

Fig. 9. Drillia incilifera var. distans (Conrad) 156 

9. Ventral view. St. Mary's River. 

Fig. 10. Drillia whitfieldi n. sp 157 

10. Ventral view of type of D. elegans Whitfield (non Emmons). 

Jericho. New Jersey. U. S. National Museum. 

Fig. 11. Drillia calvertensis n. sp 158 

11. Specimen from Plum Point. U. S. National Museum. 

Figs. 12, 13. Drillia limatula Conrad 158 

12. Ventral view. St. Mary's River. 

13. Ventral view. Plum Point. 

Figs. 14, 15. Drillia limatula var. dissimilis Conrad 159 

14. Dorsal view. St. Mary's River. 

15. Ventral view. Same locality. 

Fig. 16. Drillia limatdla. var. pyramidalis n. var 160 

16. Ventral view. St. Mary's River. 

Fig. 17. Drillia pseudeburnea (Whitfield) 160 

17. Ventral view. Plum Point. 



u 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XLII. 




















MOLI.USCA — GASTROPODA. 



PLATE XLIII. 

FAQE 

Figs. 1-3. Cancellaria alterxata Conrad 161 

1. Ventral view. Jones Wharf. 

2. Dorsal view. St. Mary's River. 

3. Ventral view of the same specimen. 

Pig. 4. Caxcellabia exgoxat.4^ Conrad 162 

4. Ventral view. Plum Point. 

Fig. 5. Cancellaria lunata Conrad 163 

5. Ventral view. St. Mary's River. 

Figs. 6a, 6b. Cancellaria prunicola n. sp 164 

6a. Dorsal view. Plum Point. 

61). Ventral view of the same specimen. 

Pig. 7. Cancellaria reticulatoides Conrad 164 

7. Ventral view. Plum Point. 

Fig. 8. Cancellaria (Admete) marylandica n. sp 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. 

Pigs. 11a. lib. Cancellaria (Sveltia) patuxentia n. sp 167 

11a. Dorsal view. Jones Wharf. 

lib. Ventral view of the same specimen. 

Fig. 12. Cancellaria (Sveltia) calvertensis n. sp 167 

12. Ventral view. Plum Point. U. S. National Museum. 

Figs. 13a, 13b. Cancellaria (Cancellariella) neritoidea n. sp 16S 

13a. Ventral view. Jones Wharf. 
13b. Dorsal view of the same specimen. 



35 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XLIII. 







lib ^^--^ 13a 

MOLLUSCA — GASTROPODA. 



PLATE XLIV. 

PAGE 

Pigs, la, lb. Oliva litterata Lamarck 169 

la. Dorsal view. Church Hill. 

lb. Ventral view of the same specimen. 

Figs. 2, 3. Oliva habrisi n. sp 170 

2. Ventral view of young individual. Plum Point. U. S. National 

Museum. 

3. Ventral view of larger specimen. Same locality. 

Fig. 4. Mabginella minuta Pfeiffer 170 

4. Ventral view. Greensboro. 

Fig. 5. Marginella denticulata Conrad 171 

5. Ventral view. St. Mary's River. 

Fig. 6. Marginella calvertexsis n. sp 172 

6. Ventral view. Plum Point. U. S. National Museum. 

Fig. 7. ScAPHELLA solitaria (Conrad) 173 

7. Ventral view. Plum Point. 

Figs, 8, 9. Scaphella (Aurima) mutabili.s (Conrad) 174 

8. Ventral view. St. Mary's River. 

9. Ventral view of another specimen. Same locality. 

Fig. 10. Scaphella (Aurinia) typus (Conrad) 175 

10. Ventral view. Jones Wharf. 

Fig. 11. Scaphella (Aurinia) obtusa (Emmons) 175 

11. Ventral view. (After Dall.) 

Fig. 12. Mitka MARIANA n. sp 177 

12. Ventral view. St. Mary's River. Wagner Free Institute of 

of Science. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XLIV. 




MOLLUSCA — GASTROPODA. 



PLATE XLV. 

PAGE 

Figs, la, lb. FuLGAK spiniger (Conrad) var 177 

la. Ventral view. Jones Wharf. 

lb. Dorsal view of the same specimen. 

Figs. 2, 3a, 3b. Fulgar fusiforme Conrad 178 

2. Dorsal view. St. Mary's River. 

3a. Ventral view. Cove Point. 

3b. Dorsal view of another specimen. Same locality. 

Figs. 4a, 4b. Fulgar tuberculatum Conrad 179 

4a. Dorsal view. St. Mary's River. 
4b. Ventral view of the same specimen. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XLV. 




MOLLUSCA GASTROPODA. 



PLATE XLVI. 

PAGE 

Figs, la, lb. FuLGAR cobonatum Conrad 180 

la. Ventral view. St. Mary's River, 
lb. Dorsal view of the same specimen. 

Figs. 2a, 2b. Fulgae coronatum var. rugosum Conrad 181 

2a. Dorsal view. St. Mary's River. 

2b. Ventral view of the same specimen. 



3S 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XLVI. 









MOLLUSCA — GASTROPODA. 



PLATE XLVII. 

PASE 

Pig. 1. LiROsoMA suLCOSA Conrad 183 

1. Ventral view. St. Mary's River. 

Figs. 2, 3. Chrysodomus patuxe.ntensis n. sp 184 

2. Ventral view. Jones Wharf. 

3. Dorsal view. Plum Point. 

Fig. 4. BucciNOFUsus pakilis Conrad 184 

4. Ventral view. St. Mary's River. 

Figs. 5, G. SiPHONALiA DEVEXA (Conrad) 185 

5. Ventral view. Plum Point. 

6. Dorsal view of another specimen. Same locality. 

Pigs. 7, 8. SiPHOxALiA MIGRANS (Conrad) 186 

7. Ventral view. Plum Point. 

8. Dorsal view of another specimen. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XLVH. 




MCLLUSCA GASTROPODA. 



PLATE XLVIII. 

PAQB 

Fibs, la, lb. SiPHONALiA makylaxdk a n. sp 186 

la. Dorsal view. St. Mary's River. 

lb. Ventral view of the same specimen. 

Pig. 2. SrPHONALIA ( ?) CALVEBTANA n. Sp 187 

2. Specimen from Plum Point. U. S. National Museum. 

Figs. 3a, 3b, 4. Pisa.^jia (Celatoconus) protractus (Conrad) 188 

3a. Dorsal view. Plum Point. 

3b. Ventral view of the same specimen. 

4. Tip of a specimen from the same locality. X 4 

Fig. 5. Ptychosalpinx axtilis (Conrad) 188 

5. Ventral view. St. Mary's River. 

Fig. 6. Ptychosalpinx multirugata Conrad 189 

6. Dorsal view. Plum Point. U. S. National Museum. 

Fig. 7. Ptychosalpinx lienosa Conrad 189 

7. Ventral view. Plum Point. 

Figs. 8, 9. Ilyanassa (?) (Paranassa) porcina (Say) 190 

8. Ventral view of type-specimen of Buccinum porcinuvi. St. Mary's 

River (?). British Museum. (After Say.) 

9. Ventral view of type-specimen of Buccinum aratuni. St. Mary's 

River (?). British Museum. (After Say.) 



40 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XLVIII. 




MOLLUSCA — GASTROPODA. 



PLATE XLIX. 

PAGE 

Fig. 1. Nassa calvektensis n. sp 191 

1. Ventral view. Plum Point. U. S. National Museum. 

Fig. 2. Nassa gubernatoria n. sp 192 

2. Ventral view. Governor Run. 

Figs. 3. 4. Nassa tkivittatoides (Whitfield) 192 

3. Ventral view. Jones Wharf. 

4. Ventral view of another specimen. Same locality. 

Figs. 5a, 5b. Nassa oREENSBORoiiNsis n. sp 194 

5a. Dorsal view. Greensboro. 

5b. Ventral view of the same specimen. 

Figs. 6-8. Nassa mabylandica n. sp 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. 

Figs. 9, 10. Nassa peralta Conrad 195 

9. Ventral view. St. Mary's River. 

10. Dorsal view of another specimen. Same locality. 

Fig. 11. Nassa pebaltoides Conrad 195 

11. Ventral view. Jones Wharf. 

Fig. 12. Nassa trivittata Say 196 

12. Ventral view. Possibly from St. Mary's River. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XLIX. 
















MOLLUSCA — GASTROPODA. 



PLATE L. 

PAOB 

Figs. 1, 2. BuLLiopsis INTEGRA Conrad 197 

1. Ventral view of adult individual. St. Mary's River. 

2. Ventral view of young individual. Same locality. 

Fig. 3. BuLLiopsis QUADRATA Conrad 198 

3. Ventral view. St. Mary's River. 

Fig. 4. BULLIOPSIS MARYLANDicA Conrad 198 

4. Ventral view. Cove Point. 

Figs. 5-7. CoLUMBELLA (AsTTRis) COMMUNIS (Conrad) 199 

5. Ventral view. Cove Point. 

6. Ventral view. St. Mary's River. 

7. Ventral view of another specimen. Same locality. 

Fig. 8. COLUMBELLA CALVERTENSIS n. Sp 200 

8. Ventral view. Plum Point. U. S. National Museum. 

Figs. 9a, 9b. Mukex (Pterorhytis) conradi Dall 200 

9a. Ventral view. St. Mary's River. (After Dall.) U. S. National 

Museum. 
9b. Apical view of the same specimen. (After Dall.) 



42 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE L. 













MOLLUSCA GASTROPODA. 



PLATE LI. 

PAGE 

Figs. 1-3. Typhis acuticosta Conrad 201 

1. Dorsal view. Cove Point. 

2. Ventral view. Same locality. 

3. Ventral view. Plum Point. U. S. National Museum. 

Pigs. 4-6. MuRiciDEA SHiLOHENsis (Hellprln) 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. Tbophon tetricus Conrad 202 

7a. Dorsal view. St. Mary's River. 
7b. Ventral view of same specimen. 

Fig. S. Trophon tetricus var. levis n. var 203 

8. Ventral view. St. Mary's River. 

Figs. 9, 10. Tbophon chesapeakeanus n. sp 203 

9. Ventral view of young individual. St. Mary's River. 

10. Ventral view of adult. Same locality. 

Figs. 11-13. ScALASPiKA strumosa Conrad 204 

11. Ventral view. Yorktown, Virginia. 

12. Ventral view.- St. Mary's River. 

13. Ventral view. Cove Point. 

Figs. 14, 15. Ukosaxpinx cinebeus (Say) ? 205 

14. Ventral view. Cove Point. 

15. Dorsal view of another specimen. Same locality. 

Figs. 16, 17. Ubosalpinx eusticus (Conrad) 206 

16. Ventral view. St. Mary's River. 

17. Ventral view. Cove Point. 

Pigs. 18-20. CORALLIOPHILA CUMBERLANDIANA (Gabb) 211 

18. Dorsal view. St. Mary's River. 

19. Ventral view. Same locality. 

20. Dorsal view. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE. PLATE LI. 








MOLLUSCA GASTROPODA. 



PLATE LII. 

PAGE 

Figs. 1-3. BcPHORA QUADKicosTATA (Say) 207 

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 QUADKICOSTATA var. uMBiLicATA (Wagner) 209 

4. Ventral view. Jones Wharf. 

Figs. 5-8. EcPHORA TRICOSTATA n. sp 209 

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. EcPHORA TAMPAiJNSIS ( Dall) 210 

9. Ventral view. Church Hill. U. S. National Museum. (After 
Dall.) 
10. Ventral view. Jones Wharf. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE Lll. 




MOLLUSCA — GASTROPODA. 



PLATE LIII. 

PAGE 

Pigs. 1, 2. SCALA SAYAXA Dall 212 

1. Ventral view. St. Mary's River. 

2. Ventral view. Greensboro. 

Pig. 3. SCALA MARTLANDICA n. Sp 213 

3. Ventral view. Jones Wharf. 

Fig. 4. ScALA (Opalia) calveetensis n. sp 213 

4. Ventral view. Plum Point. U. S. National Museum. 

Fig. 5. Scala (Opalia) eeticl'lata n. sp 214 

5. Ventral view. Plum Point. 

Fig. 6. Scala (Opalia) prunicola n. sp 214 

6. Ventral view. Plum Point. 

Fig. 7. Scala ( Sthexorhytis) expaxsa Conrad 215 

7. Ventral view. Jones Wharf. Wagner Free Institute of Science. 

Pig. 8. Scala (Sthenorhytis) pachypleuba Conrad 215 

8. Ventral view. Plum Point. 

Figs. 9, 10. BuLiMA ebobea Conrad 216 

9 Ventral view. St. Mary's River. 

10. Ventral view of another specimen. Same locality. 

Pig. 11. EuLiMA L.s:viGATA (H. C. Lea) 217 

11. Ventral view. St. Mary's River. 

Fig. 12. EuLiMA MioBANS Courad 217 

12. Ventral view. Cove Point. 

Fig. 13. Niso LiNEATA Courad 218 

13. Ventral view. Plum Point. 



45 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE Llll. 














12 




MOLLUSCA GASTROPODA. 



PLATE LIV. 

PAGE 

Fig. 1. Odostomia (Chrysallida) melaxoidis (Conrad) 220 

1. Ventral view. St. Mary's River. Cornell University. 

Fig. 2. Pyramideixa (Chrysallida) graxui.ata (H. C.Lea) 220 

2. Ventral view of type specimen. Petersburg. Virginia. Acad. Nat. 

Sci., Phila. 

Figs. 3, 4. OnosTOMiA co.^oidea (Brocchi) 219 

3. Ventral view. Jones Wharf. 

4. Ventral view. St. Mary's River. 

Fig. 5. OnosTOMiA (Evai.ia) mariaxa n. sp 221 

5. Ventral view. St. Mary's River. 

Fig. 6. Ono.sTOMiA (Syrnola) marylanpica n. sp 221 

G. Ventral view. St. Mary's River. Cornell University. 

Figs. 7, 8. Odostoma (Pyrgulina) calvektexsis n. sp 221 

7. Ventral view. Plum Point. 

8. Ventral view of another specimen. Same locality. 

Figs. 9, 9a. Etjlimella (Anisoctcla) MARYLAxmoA n. sp 222 

9. Ventral view. St. Mary's River. 

9a. Nucleus of the same specimen, much enlarged. 

Fig. 10. TuRBONiLLA (CiiEMNiTziA ) NiviA Stimpson 222 

10. Ventral view. St. Mary's River. 

Figs. 11, 12. TuRBONiLLA (Chemnitzia) nivea Stimpson var 223 

11. Ventral view. Cove Point. 

12. Ventral view. St. Mary's River. 

Figs. 13, 14. TuRBON'iixA (Pyrgiscus) interrupta (Totten) 224 

13. View of specimen from Greensboro. 

14. Ventral view. St. Mary's River. 

Fig. 15. Tttrbonilla (Tragula) gubernatoria n. sp 224 

ID. Ventral view. Governor Run (lower bed). 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LIV. 

















MOLLUSCA GASTROPODA. 



PLATE LV. 

PAGE 

Figs. 1, 2. Tritonium centeosum (Conrad) 225 

1. Ventral view. Plum Point. 

2. Ventral view of younger individual. Same locality. 

Fig. 3. Pyrula harrisi n. sp 226 

3. Ventral view. Plum Point. 

Fig. 4. Cassis c.elata Conrad 226 

4. Ventral view. St. Mary's River. 

Fig. 5. Erato perexigua ( Conrad ) 227 

5. Ventral view. Plum Point. U. S. National Museum. 

Fig. 6. Seila adamsii (H. C. Lea) 228 

6. Ventral view. Plum Point. 

Fig. 7. Cekithiopsis calvektensis n. sp 229 

7. Ventral view. Plum Point. 

Fig. 8. Cerithiopsis subulata (Montagu) 230 

8. Ventral view. Greensboro. 

Fig. 9. GONIOBASIS MARYLANDICA n. Sp 230 

9. Ventral view. St. Mary's River. 

Fig. 10. Cecum calvertense n. sp 231 

10. Specimen from Church Hill. 

Figs. 11, 12. C^CUM PATUXENTIUM n. sp 231 

11. Specimen from Greensboro. 

12. Specimen from Governor Run (lower bed). 

Fig. 13. C^cuM greensboroexse n. sp 231 

13. Specimen from Greensboro. 

Figs. 14, 15. Vermetus graniferds (Say) 232 

14. Specimen from Church Hill. 

15. Specimen from Jones Wharf. 

Fig. 16. Vermetus virginicus (Conrad) 232 

16. Specimen from Plum Point. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LV. 

















MOLLUSCA — GASTROPODA. 



PLATE LVI. 

PAGE 

Pigs. 1, 2. TuRRiTELLA iNDENTA Conrad 233 

1. Ventral view. 3 miles south of Chesapeake Beach. 

2. Ventral view. Plum Point. 

Fig. 3. TuRRiTELLA ^QUiSTRiATA Conrad 234 

3. Ventral view. Church Hill. 

Figs. 4-9. TuBBiTELLA PLEBEiA Say 234 

4. Ventral view of typical form. St. Mary's River. 

5. Ventral view of typical form. Jones Wharf. 
G. Specimen from Jones Wharf showing var. A. 
7. Specimen from Plum Point showing var. B. 
S. Specimen from same locality showing var. A. 
9. Specimen of var. octonaria. Dover Bridge. 



48 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LVI. 












MOLLUSCA — GASTROPODA. 



PLATE LVII. 

PAGE 

Fig. 1. TuRRiTELLA VARIABILIS Conrad 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 tlie same locality. 

Fig. 5. TURRITELLA VARIABILIS var. EXALTATA Conrad 238 

5. Specimen from Plum Point. 

Figs. 6-8. TuRRiTELLA VARIABILIS var 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. Tachtrhtnchus perlaqueatus (Conrad) 239 

9. Ventral view of type specimen. " Calvert Cliffs." Acad. Nat. Sci., 

Phila. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE. PLATE LVIl. 




W-V-^ 






MOLLUSCA — GASTROPODA. 



PLATE LVIII. 

PAOK 

Fig. 1. LiTTORINA lERORATA (Say) 240 

1. Ventral view. Choptank River. U. S. National Museum. 

Fig. 2. FossAKUs (IsiPis) DALLi (Whitfield) 240 

2. Ventral view. Plum Point. 

Figs. 3a-3c. Solarium trilineatum Conrad 241 

3a. Profile of specimen from Plum Point. 
3b. Upper view of same specimen. 
3c. Lower view of same specimen. 

Figs. 4a, 4b. Solarium ampiiiterum Dall 242 

4a. Upper view. Greensboro. U. S. National Museum. (After Dall.) 
4b. Lower view of same specimen. (After Dall.) 

Fig. 5. RissoA (Oxoba) jiarylaxdu a n. sp 243 

5. Ventral view. Cove Point. 

Figs. Ga-Gc. Adeorbis supkakitidus S. Wood 243 

Ga. Profile view. St. Mary's River. Wagner Free Institute of 

Science. 
Cb. Upper view of the same specimen. 
Cc. Lower view of the same specimen. 

Figs. 7a, 7b. Ceucibulum ccstatum ( Say ) 244 

7a. Dorsal view. Plum Point. 

7b. Ventral view of the same specimen. 

Figs. S-10. Crucibulum 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. 

Fig. 11. Crucibulum constrictum Conrad 246 

11. Dorsal view. St. Mary's River. 

Figs. 12a, 12b. Crucibulum multilineatum Conrad 246 

12a. Dorsal view. Jones Wharf. 

12b. Ventral view of the same specimen. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LVIII. 




12a 



12b 



MOLLUSCA — GASTROPODA. 



PLATE LIX. 

PAGE 

Fig. 1. Calyptr.ea aperta (Solander) 247 

1. Dorsal view. Plum Point. 

Figs. 2a-2c. Calyptb.ea centralis ( Conrad ) 248 

2a. Dorsal view. St. Mary's River. 
2b. Ventral view of the same specimen. 
2c. Lateral view of the same specimen. 

Figs. 3a, 3b. Calyptr.ea greensboroensis n. sp 248 

3a. Interior of specimen from Greensboro. 
3b. Exterior of the same specimen. 

Figs. 4a, 4b. Crepidula fornicata (Linno) 249 

4a. Exterior of specimen from Cove Point. 
4b. Interior of the same specimen. 

Figs. 5a, 5b. Crepidula plana Say 250 

5a. Exterior of specimen from Plum Point. 
5b. Interior of the same specimen. 

Figs. Ca-6d. Amaltiiea .aiabylaxdica n. sp 251 

6a. Exterior of a specimen from Greensboro. 

6b. Interior of the same specimen (muscular scars drawn from a 

specimen from Jones Wharf). 
Cc. Lateral view of the same specimen. 
Gd. Beak of the same specimen, much enlarged. 

Figs. 7a-7c. Xenopiiora conchyliopiiora (Born) 251 

7a. Exterior of a specimen from Plum Point. 

7b. Interior of the same specimen. 

7c. Lateral view of the same specimen. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LIX. 









MOLLUSCA — GASTROPODA. 



PLATE LX. 

PAGE 

Fig. 1. PoLYXicES (Neverita) nuPLicATUs (Say) 252 

1. Ventral view. St. Mary's River. 

Fig. 2. PoLYNicES (Lunatia) hemicryptus (Gabb) 252 

2. Ventral view. Jones Wharf. 

Figs. 3, 4. PoLYxicES (Lu.natia) heeos ( Say) 253 

3. Ventral view. Jones Wharf. 

4. Ventral view. St. Mary's River. 

Figs. 5a, 5b. Sigaeetus feagilis Conrad 255 

5a. Ventral view. Plum Point. 

5b. Dorsal view of the same specimen. 



52 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LX. 









MOLLUSCA GASTROPODA. 



PLATE LXI. 

PACE 

Pig. 1. Calliostoma BELLUiM (Conracl) 256 

1. Ventral view. Miocene ot 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.) 

Fig. 4. Calliostoma piiila.xthropus var 257 

4. Ventral view. Jones Wharf. 

Fig. 5. Callicstoma viroinicum ( Conrad ) 257 

5. Ventral view. Miocene of Maryland. Wagner Free Institute of 

Science. 

Fig. 6. Calliostoma distans (Conrad) 258 

6. Ventral view. St. Mary's River. 

Fig. 7. Calliostoma EnoKEUM (Wagner) 259 

7. Ventral view. Reed's. 

Fig. 8. Calliostoma wagxeri Dall 260 

8. Ventral view. Greensboro. U. S. National Museum. (After 

Dall.) 

Figs. 9-11. Calliostoma apitelium Dall 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. 

Fig. 12. Calliostoma peealveatum (Conrad) 261 

12. Ventral view. Plum Point. 

Figs. 13a-13c. Calliostojia humile (Conrad) 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. Calliostoma reclusum ( Conrad ) 262 

14a. Profile of specimen from St. Mary's River. 
14b. Upper view of same specimen. 
14c. Lower view of same specimen. 

Figs. 15a, 15b. Calliostoma marylandicum n. sp 263 

15a. Profile of specimen from Plum Point. U. S. National Museum. 
15b. Same specimen as seen from above. 

Figs. 16a-16c. Calliostoma calverta.n'um n. sp 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. 




13c. 

MOLLUSCA — G.\STROPOU.\, 



PLATE LXII. 

PAGE 

Figs. 1, 2. Teinostoma nanum (Lea) 263 

la. Profile of specimen from Cove Point. 

lb. Same specimen as seen from above. 

Ic. 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 n. sp 264 

3a. Profile of specimen from Plum Point. 
3b. Upper view of the same specimen. 
3c. Lower view of the same specimen. 

Pigs. 4a-4c. Teinostoma lii'auu.ai (H. C. Lea) 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-5c. Teinostoma oREENSBouoiiNSK n. sp 265 

5a. Profile of specimen from Greensboro. 
5b. Upper view of the same specimen. 
5c. Lower view of the same specimen. 

Figs. 6a-6c. Cociiliolepis striata Dall 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. 

Fig. 7. MoLLERiA mixuscula Dall 266 

7. View of type specimen. St. Mary's River. U. S. National Museum. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXII. 









3a 








5b 



5a 





6c 





MOLLUSCA GASTROPODA. 



PLATE LXIII. 

PAGE 

Pigs, la, lb. PissuKiDEA ALTicosTA (Conrad) 266 

la. Dorsal view. St. Mary's River. Wagner Free Institute of 

Science. . 
lb. Lateral view of the same specimen. 

Figs. 2, 3. FissuRiDEA gbiscomi (Conrad) 267 

3a. Dorsal view. Church Hill. 

2b. Lateral view of the same specimen. 

3a. Dorsal view of young individual. Same locality. 

3b. Lateral view of the same specimen. 

Pigs. 4a, 4b. PissuRiDEA MARYLANDicA (Conrad) 268 

4a. Dorsal view. Plum Point. 

4b. Lateral view of the same specimen. 

Pigs. 5a, 5b. Fissubidea nassuia (Conrad) 268 

5a. Dorsal view. Jones Wharf. 

5b. Lateral view of the same specimen. 

Pig. 6. PissuKiDEA REDiMicuLA ( Say) 269 

6. Lateral view of type specimen. St. Mary's River. British 
Museum. (After Say.) 

Pigs. 7a, 7b. Emarginula marylandica n. sp 269 

7a. Lateral view. Greensboro. 

7b. Dorsal view of the same specimen. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXIII. 




MOLLUSCA GASTROPODA. 



PLATE LXIV. 

PAGE 

Figs. 1,2. CH^TOPLEtTBA APicuLATA ( Say ) 270 

la. Ventral view of posterior valve. 3 miles south of Chesapeake 

Beach, 
lb. 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. 

Pig. 3. De:«talium attenuatum Say 271 

3. Specimen from St. Mary's River. 

Fig. 4. Dentalium danai Meyer 272 

4. Specimen from Plum Point. 

Figs. 5a, 5b. Dentalium caduloide Dall 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.) 

Fig. 6. Cadulus thallus (Conrad) 273 

6. Specimen from Plum Point. 

Fig. 7. Cadulus newtone.nsi.s Meyer and Aldrich 273 

7. Specimen from Jones Wharf. 



56 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXIV. 





' la 






. 2b 




MOLLUSCA — AMPHINEURA AND SCAPIIOPODA. 



PLATE LXV. 

PiSE 

Fig. 1. PrioLAS (Thorana) prouucta Conrad 274 

1. Exterior of left valve. South Carolina. (After Tuomey and 

Holmes. ) 

Figs. 2, 3. Barxea (Scobina) arcuata (Conrad) 274 

2. Exterior of right valve. St. Mary's River. 

3. Exterior of right valve. Same locality. 

Figs. 4-9. Martesia ovalis (Say) 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. 
G. 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. 

Fig. 10. Panopea wHiTFiELni Dall 276 

10. Exterior of right valve. Plum Point. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE PLATE LXV. 





MOLLUSCA — PELECYPODA. 



PLATE LXVI. 

PAGE 

Pig. 1. Panopea goldfussii Wagner 277 

1. Exterior of right valve. Plum Point. 

Fig. 2. Panopea amebicana Conrad 278 

2. Exterior of left valve. Plum Point. 

Pigs. 3-6. Saxicava asctica (Linne) 278 

3. Exterior of left valve. Plum Point. 

4. Exterior of right valve. Jones Wharf. 

5. Interior of left valve. Jones Wharf. 

6. Exterior of right valve of one of numerous distorted forms. 

Chesapeake Beach. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXVI. 








MOLLUSCA — PELECVPODA. 



PLATE LXVII. 

rAOE 

Figs. 1-3. CoRBULA iDONEA Conrad 279 

1. Exterior of right valve. Jones Wharf. 

2. Interior of right valve of another specimen. Same locality. 

3. Interior of left valve. Same locality. 

Pigs. 4-5. CoRBULA ELEVATA Conrad 280 

4. Interior of right valve. Plum Point. 

5. Exterior of right valve. Same locality. 

Figs. 6-14. CoRBULA iN.EQUALis Say 281 

6. Exterior of right valve. Church Hill. 

7. Interior of right valve. Plum Point. 

8. Exterior of right valve of large variety. St. Mary's River. 

9. Exterior of valve. Jones Wharf. 

10. Exterior of left valve. Church Hill. 

11. Interior of left valve of coarsely sculptured variety. Plum 

Point. 

12. Exterior of right valve of same individual as shown in Fig. 11. 

13. Exterior of left valve. Jones Wharf. 

14. Exterior of right valve. Oligocene of Oak Grove, Fla. Type 

specimen of C. whitfieldi Dall. (After Dall.) 

Figs. 15-19. CoBBULA cuNEATA Say 282 

15. Interior of left valve. Jones Wharf. 

16. Exterior of left valve. Same locality. 

17. Exterior of right valve. Same locality. 

18. Exterior of right valve. Same locality. 

19. Interior of right valve. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXVII. 




MOLLUSCA — PELECYPODA. 



PLATE LXVIII. 

PAGE 

Figs, la, lb, 2. Mya producta Conrad 283 

la. Interior of left valve. Jones Wharf. 
lb. Exterior of same valve. 

2. Profile of hinge area of same valve. 

Figs. 3-6. Sphenia dubia (H. C. Lea) 283 

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. 

Pigs. 7, 8. Paramya subovata Conrad 284 

7. Interior of left valve. Two miles south of Governor Run. 

8. Exterior broken valve. Jones Wharf. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXVIIL 




MOLLUSCA — PELECYPODA. 



PLATE LXIX. 

PAGE 

Pigs. 1-3. Mesouesma mariana n. sp 285 

1. Exterior of right valve. Cove Point. 

2. Interior of right valve. Same locality. 

3. Interior of left valve. Same locality. 

Figs. 4-6. Ervilia plaxata Dall 285 

4. Interior of left valve. Church Hill. 

5. Interior of right valve. Same locality. 

6. Exterior of left valve. Same locality. 

Figs. 7-9. Mactra clathrodon Lea 286 

7. Interior of left valve. Cove Point. 

8. Exterior of left valve. Same locality. 

9. Interior of right valve. Same locality. 

Fig. 10. Spisula (Hemimactra) delumbis (Conrad) 286 _ 

10. Interior of right valve. Suffolk, Va. 96 mm. (After Dall.) 

X 5/6 

Fig. 11. Spisula (Hemimactra) marylandica Dall 2S7 

11. Interior of right valve. 92 mm. (After Dall.) x % 

Figs. 12, 13. Spisula (Hemimactra) cuktidens Dall 288 

12. Outline of young shell traced from incremental lines on broken 

larger valve. 35 mm. (After Dall.) X 5/6 

13. Hinge-plate of right valve: a, dorsal and e, ventral anterior 

laminae; 6, anterior arm of cardinal tooth; c. ligament scar, 
vi'ithout septum below it; d and f, posterior laminae. 44 mm. 
(After Dall.) 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXIX. 




MOLLUSCA — PELECYPODA. 



PLATE LXX. 

PAGE 

Figs. 1-4. Spisula (Hemimactra) sunPONDERosA (d'Orbigny) 28S 

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.) 

2. Exterior of right valve. St. Mary's River. x % 

3. Interior of left valve. St. Mary's River. x % 

4. 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.) 

Figs. 5a, 5b. Spisula (Hemimactra) confrac.a (Conrad) 289 

5a. Exterior of left valve of type specimen. Patuxent River. Acad. 

Nat. Sci., Phila. 
5b. Interior of the same valve. 

Figs. 6a, 6b. Spisula (Hemi]mactra) subparilis (Conrad) 289 

6a. Interior of right valve. Plum Point. U. S. National Museum. 
6b. Exterior of the same specimen. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXX. 




MOLLUSCA — PELECYPODA. 



PLATE LXXI. 

PAGE 

Fig. 1. Spisula (Hemimactra?) chesapeakensis n. sp 290 

1. Exterior of right valve. 3 miles north of Plum Point, x % 

Figs. 2, 3. Exsis direc tu.s (Conrad) 291 

2. Interior of left valve. Yorktown, Va. 

3. Exterior of right valve. Same locality. 

Figs. 4-G. Ensis ensiformis Conrad 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. 

Figs. 7a, 7b. Psammobia gubernatoeia n. sp 292 

7a. Interior of left valve. Jones Wharf. 
7b. Exterior of same valve. 

Figs. 8, 9. Asaphis centenaria (Conrad) 293 

8. Interior of left valve. Jones Wharf. 

9. Exterior of left valve. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXl. 




MOLLUSCA — PELECYPODA. 



PLATE LXXII. 

PAGE 

Pigs. 1-3. Semele carinata (Conrad) 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, 5a, 5b. SEjrELE 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.) 

Pigs. 6-8. Semele subovata Say 295 

6. Exterior of right valve. Jones Wharf. 

7. Interior of right valve. Same locality. 

8. Exterior of left valve. Same locality. 

Figs. 9a, 9b. Aura longicali.a (Scacchi) 296 

9a. Exterior of right valve. Jones Wharf. 
9b. Interior of same valve. 

Fig. 10. Adra marylandica n. sp 296 

10. Interior of left valve. Plum Point. 

Pigs. 11, 12. Cumi.ngia medialis Conrad 297 

11. Exterior of left valve. Jones Wharf. (?) 

12. Interior of left valve. Same locality. 

Fig. 13. Tellixa .equistriata Say 297 

13. Exterior of left valve. Jones Wharf. (?) 

Fig. 14. Tellin'a (Anoulus) declivis Conrad 298 

14. Exterior of left valve. Plum Point. 

Pigs. 15, 16. Tellina (Angulus) peoihxta Conrad 299 

15. Exterior of left valve. Plum Point. 

16. Exterior of left valve. Cove Point. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXII. 












MOLLUSCA — PELECYPODA. 



PLATE LXXIII. 

PiGE 

Fig. 1. Tellina (Angulus) dupliniana Dall 299 

1. Exterior of left valve. Duplin Co., N. C; length 12.5 mm. (After 

Dall.) 

Pig. 2. Tellina (Angulus) umbra Dall 300 

2. Exterior of left valve. Duplin Co., N. C; length 12.5 mm. (After 

Dall.) 

Pigs. 3, 4. Macoma LEWIS (Conrad) 301 

3. Interior of right valve. Jones Wharf. 

4. Exterior of left valve. Same locality. 

Pigs. 5, 6. Metis biplicata Conrad 301 

5. Interior of left valve. Jones Wharf. 

6. Exterior of right valve. Same locality. 

Fig. 7. Macoma maeylandica n. sp 302 

7. Interior of right valve. 

Figs. 8, 9. Petbicola hakrisii Dall 302 

8. Exterior of right valve. Jones Wharf. 

9. Interior of left valve. Same locality. 

Figs. 10-12. Petricola (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. 



65 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXII 




MOLLUSCA — PELECYPODA. 



PLATE LXXIV. 

PACK 

Figs. 1. 2. Mackocallista aiarylandica (Conrad) 311 

1. Interior of left valve. Jones Wharf. 

2. Exterior of right valve. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXIV. 





MOLLUSCA PELECYPODA. 



PLATE LXXV. 

PAGE 

Figs. 1-3. Callocaedia (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. 

Pigs. 4-6. Callocakdia (Agriopoma) prunensis n. sp 313 

4. Interior of right valve. Plum Point. 

5. Exterior of left valve. Same locality. 

6. Exterior of right valve. Same locality. 

Pigs. 7, 8. Venus ducateli Conrad 304 

7. Interior of left valve. Church Hill. 

8. Exterior of right valve. Same locality. 



67 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXV. 











MOLLUSCA — PELECYPODA. 



PLATE LXXVI. 

PAGE 

Figs. 1-3. Chione alveata (Conrad ) 310 

1. Interior of right valve. St. Mary's River. 

2. Exterior of right valve. Same locality. 

3. Exterior of right valve. Same locality. 

Figs. 4, 5. Venus rileyi Conrad 304 

4. Interior of left valve. Plum Point. 

5. Exterior of right valve. Same locality. 

Figs. 6-8. Ctthekea (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. 

Figs. 9-11. Chione parkeria n. sp 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. 



MIOCENE, PLATE LXXVI. 




MOLLUSCA — PELECYPODA. 



PLATE LXXVII. 

PAGE 

Figs. 1, 2. Venus campechiensis var. moktoni (Conrad) 307 

1. Exterior of right valve. Cove Point. 

2. Interior of left valve. Same locality. 

Figs. 3-6. Chione l.^tillrata (Conrad) 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 

34 mm. (After Dall.) 
C. Interior view of right valve. Plum Point. 



MARYLAND GEOLOGICAL SURVEY, 



MIOCENE, PLATE LXXVII. 




MOLLUSCA — PELECYPODA. 



PLATE LXXVIII. 

PiGE 

Figs. 1, 2. Venus mercenaria Linne 305 

1. Interior of left valve. Plum Point. 

2. Exterior of right valve. Same locality. 



70 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXVlll 





MOLLUSCA — PELECY PODA. 



PLATE LXXIX. 

PAGE 

Figs. 1, 2. Venus plena (Conrad) 306 

1. Interior of left valve. Governor's Run. 

2. Exterior of right valve. Same locality. 



71 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXIX. 





MOLLUSCA — PELECYPODA. 



PLATE LXXX. 

PAGE 

Fig. 1. Venus campechiexsis var. capax (Conrad) 308 

1. Exterior of right valve. Cordova. 

Fig. 2. Venus campechiensis var. tetbica (Conrad) 307 

2. Exterior of right valve. St. Mary's River. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXX. 





MOLLUSCA — PELECYPODA. 



PLATE LXXXI. 

PAGE 

Fig. 1. Venus campechiensis var. capax (Conrad) 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 LXXXI. 





MOLLUSCA PELECYPODA. 



PLATE LXXXII. 

PAGE 

Pigs. 1, 2. Clementia inoceriformis (Wagner) 315 

1. Exterior of left valve. Cove Point. 

2. Interior of broken right valve. Same locality. 

Fig. 3. Venus campecheensis var. cuneata (Conrad) 308 

3. Interior of left valve. Jones Wharf. 



74 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXXII. 




MOLLUSCA — PELECVrODA. 



PLATE LXXXIII. 

PAGE 

Pig. 1. DosiNiA ACETABULUM Coiirad 315 

1. Exterior of right valve. St. Mary's River. 

Pig. 2. Venus campechiensis var. cuneata (Conrad) 308 

2. Exterior of right valve. Jones Wharf. 



75 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXXIII. 





MOLLUSCA- — PELECYPODA. 



PLATE LXXXIV. 

PAGE 

Fig. 1. DosiNiA ACETABULUM Conrad 315 

1. Interior of left valve. St. Mary's River. 

Figs. 2, 3. IsocAErjiA markoisi Conrad 316 

2. Exterior of right valve. Plum Point. 

3. Interior of left valve. Same locality. 

Figs. 4, 5. ISOCARDIA MAZLEA n. sp 317 

4. Exterior of right valve. Plum Point. 

5. Interior of left valve. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXXIV, 




MOLLUSCA PELECYPODA. 



PLATE LXXXV. 

PAOE 
Figs. 1, 2. ISOCAKDIA IGNOLEA n. sp 318 

1. Exterior of riglit valve. Cove Point? 

2. Interior of left valve of same individual. 

Pigs. 3,- 4. IsocAHDiA FRATERNA Say 317 

3. Exterior of right valve. Jones Wharf. 

4. Interior of left valve. Same locality. 



77 



MARYLAND GEOLOGICAL SURVEY 



MIOCENE, PLATE LXXXV. 




MOLLUSCA PELECYPODA. 



PLATE LXXXVI. 

PAGE 

Fig. 1. Cardium (Cekastoderma) laqueatum Conrad 319 

1. Exterior of left valve. Jones Wharf. x % 

Fig. 2. Cardium (Cerastoderma) leptopleurum Conrad 320 

2. Exterior of right valve. Plum Point. 

Fig. 3. CARMt'M (Cerastoderma) craticuloide Conrad 320 

3. Exterior of left valve. Plum Point. 

Fig. 4. Cardium (Cerastoderma) calvertensium n. sp 321 

4. Exterior of right valve. Governor's Run (lower bed). 

Fig. 5. Cardium (Cerastoderma) patuxentium n. sp 322 

5. Exterior of right valve. White's Landing. 

Figs. 6a, 6b. Cardium (Fragum) medium Linne 322 

6a. Interior of right valve. St. Mary's River. U. S. National 

Museum. 
6b. Exterior of the same valve. 

Pigs. 7a, 7b. Cardium (L-bvicardium) 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 PELECYPODA. 



PLATE LXXXVII. 

PAGE 
Figs. 1-4. SOLECAKDIA ( 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. 

Pigs. 5a, 5b. Sportella vifHiTFiELDi Dall 324 

5a. Interior of right valve. Plum Point. 
5b. Exterior of same valve. 

Fig. 6. Sportella pelex Dall 325 

6. Interior of right valve. Miocene of Virginia. U. S. National 

Museum. (After Dall.) 

Fig. 7. Sportella petropolitana Dall 325 

7. Interior of right valve. Petersburg, Virginia. U. S. National Museum. 

(After Dall.) 

Pigs. 8-10. Sportella recessa n. sp 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. 

Fig. 11. Sportella patuxextia n. sp 326 

11. Interior of right valve. Cove Point. 

Figs. 12a-13. Hixd.siella acuta Dall 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. Erycina (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.) 

Pig. 16. Erycina calvertensis n. sp 327 

16. Interior of right valve. Plum Point. 

Pig. 17. Erycina prtjna n. sp 327 

17. Interior of right valve. Plum Point. 



79 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXXVII. 




MOLLUSCA PELECYPODA. 



PLATE LXXXVIII. 

PAGE 

Figs. 1-3. Brycina mabylandica n. sp 328 

1. Exterior of left valve. Three miles south of Chesapeake Beach. 

2. Interior of right valve. Same locality. 

3. Interior of right valve. Plum Point. U. S. National Museum. 

(After Dall.) 

Figs. 4a, 4b. Erycina rickardia n. sp 328 

4a. Interior of right valve. Plum Point. 
4b. Exterior of same valve. 

Fig. 5. Brycina speciosa n. sp 329 

5. Interior of right valve. Plum Point. 

Figs. 6-8. Bornia mactroides (Conrad) 330 

6. Interior of left valve. Dover Bridge. 

7. Exterior of right valve. Same locality. 

8. Interior of right valve. Same locality. 

Figs. 9a, 9b. Bornia Triangula Dall 330 

9a. Interior of right valve. Three miles west of Centerville. 
9b. Exterior of same valve. 

Fig. 10. Bornia mary'landica n. sp 330 

10. Interior of right valve. Greensboro. 

Fig. 11. Bornia depressa n. sp 331 

11. Interior of right valve. Plum Point. 

Figs. 12, 13. Kellia rotundui-a n. sp 331 

12. Interior of right valve. Governor's Run. 

13. Interior of left valve. Same locality. 

Figs. 14-18. Thecodonta (Dicranodesma) calvertensis n. 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.) 

Fig. 19. MONTACUTA MARIANA Dall 332 

19. Interior of right valve. St. Mary's River or Plum Point. U. S. 

National Museum. (After Dall.) 

Figs. 20, 21. Aligena .equata (Conrad) 333 

20. Exterior of left valve. Jones Wharf. 

21. Exterior of right valve. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXXVIII. 




MOLLUSCA — PELECYPODA. 



PLATE LXXXIX. 

PAGE 

Figs. 1-3. Aligena .'equ.'^ta (Conrad) 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.) 

Pig. 4. Aligena .^quata var. nuda Dall 333 

4. Exterior of right valve. Plum Point. 

Figs. 5a, 5b. Aligena pustulosa Dall 334 

5a. Interior of left valve. Oligocene of Oak Grove, Florida. U. S. 

National Museum. (After Dall.) 
5b. Exterior of same specimen. (After Dall.) 

Figs. 6a, 6b. Diplodonta acclinis Conrad 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 335 

7. Exterior of left valve. Jones Wharf. 

8. Interior of right valve. Same locality. 

Figs. 9, 10. Diplodonta subvexa (Conrad) 335 

9. Interior of right valve. Flag Pond. 
10. Exterior of left valve. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE LXXXIX. 















MOLLUSCA PELECYPODA. 



PLATE XC. 

PAGE 

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. Phacoides (Pseudo.miltha) anodonta (Say) 337 

3. Interior of left valve. Jones Wharf. 

4. Exterior of right valve. Same locality. 

Figs. 5, 6. Phacoides (Lucinoma) contbactus (Say) 339 

5. Interior of left valve. Pawpaw Point. 

6. Exterior of right valve. Same locality. 

Figs. 7-9. Phacoides (Here) trisulcatus (Conrad) 337 

7. Interior of left valve. Plum Point. 

S. Exterior of right valve. Same locality. 

9. Interior of right valve. Same locality. 

Pigs. 10-12. Phacoides (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. 

Pig. 13. Phacoides (Parvilucina) prunus Dall 340 

13. Exterior of left valve. Plum Point. U. S. National Museum. 

(After Dall.) X 3. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XC. 




MOLLUSCA PELECYPODA. 



PLATE XCI. 

PAGE 

Figs. 1-3. Chama congregata Conrad 342 

1. Interior of left valve. Church Hill. 

2. Exterior of right valve. Same locality. 

3. Exterior of right valve. Same locality. 

Figs. 4-6. Cardita peotracta (Conrad ) 343 

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 344 

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. 

Figs. 11, 12. Venericardia castrana n. sp 345 

11. Exterior of right valve. Church Hill. 

12. Interior of left valve. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XCI. 












11 




12 



MOLLUSCA — PELECYPODA. 



PLATE XCII. 

FiSE 

Figs. 1, 2. Crassatellites melinus (Conrad) 346 

1. Exterior of left valve. Plum Point. 

2. Interior of left valve. Same locality. x 8/9 

Pigs. 3-5. Crassatellites tuegidulus ( Conrad) 348 

3. Exterior of left valve. Jones Wharf. 

4. Exterior of left valve of young. Same locality. 

5. Interior of left valve. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XCII. 




MOLLUSCA PELECYPODA. 



PLATE XCIII. 

PAGE 

Figs. 1-3. Crassatellites martlakdicus (Conrad) 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. AsTAETE cuNEiFOKMis Conrad 353 

4. Exterior of right valve. Plum Point. 

5. Exterior of right valve. Same locality. 

6. Interior of left valve. Same locality. 

Figs. 7-9. ASTAETE CASTRANA n. sp 353 

7. Interior of right valve. Reed's. 

8. Exterior of right valve. Same locality. 

9. Exterior of left valve. Same locality. 

Figs. 10, 11. AsTAKTE viciNA Say 350 

10. Exterior of right valve. Plum Point. 

11. Interior of left valve. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XCMI. 




MOLLUSCA — PELECYPODA. 



PLATE XCIV. 

PAGE 

Pigs. 1, 2. AsTARTE THOMASii Conrad 351 

1. Exterior of riglit valve. Plum Point. 

2. Interior of left valve. Same locality. 

Figs. 3, 4. AsTARTE CALVERTENSIS n. sp 352 

3. Exterior of left valve. Plum Point. 

4. Interior of right valve. Same locality. 

Figs. 5, 6. AsTARTE OBRUTA Conrad 354 

5. Interior of left valve. Dover Bridge. 

6. Exterior of left valve. Same locality. 

Figs. 7-9. ASTARTE THISPHILA n. sp 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. 

Figs. 10, 11. AsTARTE PERPLANA Conrad 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. Cras.satellites (Crassinella) galvestonensis (Harris).. 350 

13. Exterior of right valve. St. Mary's River. 

14. Interior of left valve. Same locality. 

Fig. 15. Astabte parma Dall 357 

15. Exterior of left valve. (After Dall.) x 4/5 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XCIV. 













MOLLUSCA — PELECYPODA. 



PLATE XCV. 

PAGE 

Figs. 1, 2. Pandora (Clidiophora) crassidens Conrad 357 

1. Exterior of left valve. St. Mary's River. 

2. Interior of right valve. Same locality. 

Fig. 3. Periploma peralta Conrad 359 

3. Interior of broken valve. Cove Point. 

Fig. 4. Thracia conradi Couthouy 359 

4. Exterior of left valve. Plum Point. 

Pigs. 5, 6. Margaritaria abrupta (Conrad) 361 

5. Exterior of right valve. Yorktown, Virginia. 

6. Interior of left valve. Same locality. 

Fig. 7. Pandora (Kennebleyia) lata Dall 358 

7. Exterior of left valve. St. Mary's River (?). U. S. National 

Museum. (After Dall.) 

Fig. S. Divaricella quadrisulcata (d'Orbigny) 341 

8. Exterior. Petersburg, Va. U. S. National Museum. (After 

Dall.) X iy2 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XCV. 




MOLLUSCA PELECYPODA. 



PLATE XCVI. 

FASE 

Figs, la, lb. Mytilus conradinus d'Orbigny 362 

la. Exterior of right valve. Plum Point. X Vz- 
lb. Interior of same valve. 

Figs. 2-4. Mytilus (Mytiloconcha) incubvcs Conrad 363 

2. Exterior of right valve with part of beak of left valve showing 

beneath. Greensboro. X % 

3. 'Interior of right beak. Same locality. 

4. Interior of left beak. Same locality. 



S8 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XCVI. 




MOLLUSCA PELECYPODA. 



PLATE XCVII. 

PiLGE 

Fig. 1. LiTHOPHAGA suBALVEATA Coiirad 364 

1. Exterior of right valve. Sliiloh, New Jersey. Acad. Nat. Sci., 

Phila. (After Conrad. Amer. Jour. Concli., vol. II, pi. IV, 
fig. IV.) 

Fig. 2, 3. LiTHOPHAGA lONENSIS D. sp 364 

2. Exterior of right valve. Jones Wharf. 

3. Exterior of right valve. Same locality. 

Fig. 4. Cbenella vieida n. sp 365 

4. Specimen from Greensboro. 

Fig. 5. Crenella gudernatoeia n. sp 365 

5. Specimen from Governor Run. 

Figs. 6, 7. Modiolus ducatellii Conrad 366 

6. Exterior of right valve. Dover Bridge. 

7. Interior of beak portion of left valve. Cove Point. 

Figs. 8a, 8b. Modiolus virgixicus (Conrad) 366 

8a. Exterior of left valve. St. Mary's River. 
8b. Interior of same specimen. 

Figs. 9, 10. Modiolus dalli n. sp 367 

9. Interior of right valve. Pav^paw Point. 

10. Exterior of left valve of same individual. 

Figs. 11, 12. Modiolus ionensis n. sp 368 

11. Exterior of right valve. Jones Wharf. 

12. Interior of left valve of same individual. 

Fig. 13. Modiolaria curta n. sp 368 

13. Exterior of right valve. Plum Point. Cornell University. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XCVII, 






MOLLUSCA — PELECYPODA. 



PLATE XCVIII. 

PAGE 

Fig. 1. Anomia simplex d'Orbigny 369 

1. Exterior of upper valve. St. Mary's River. 

Figs. 2-5. Anomia aculeata Gmelin 369 

2. Exterior of brolien 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. 

Fig. 6. Lima papyria Conrad 370 

6. Exterior of right valve. Plum Point. 

Figs. 7-9. Plicatula densata Conrad 371 

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. Pecten (Pecten) humphreysii Conrad 372 

10. Exterior of lower valve. Plum Point, x i^. 

11. Exterior of another lower valve. Same locality. 

12. Exterior of an upper valve. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XCVIII 




MOLLUSCA PELECYPODA. 



PLATE XCIX. 

PAGE 

Fig. 1. Pecten (Amusium) mortoni Ravenel 372 

1. Exterior of right valve. Fort Thompson, Florida. U. S. National 

Museum. X % 

Fig. 2. Pecten (Pseudamusium) cerikus Conrad 373 

2. Exterior of right valve. Plum Point. 

Fig. 3. Pecten (Chlamys) coccymelus Dall 374 

3. Exterior of left valve. Plum Point. (After Dall.) 

Fig. 4. Pecten (Chlamys) rogersi Conrad 375 

4. Exterior of right valve. Near Skipton. U. S. National Museum. 

Fig. 5. Pecten (Chlamys) clintonius Say 375 

5. Exterior of right valve. James River, Virginia. x % 

Fig. 6. Pecten (Chlamys) marylandicus Wagner 376 

6. Exterior of left valve. Jones Wharf. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE XCIX. 




MOLLUSCA PELECYPODA. 



PLATE C. 

PAGE 

Fig. 1. Pecten (Chlamys) mauisokius Say 377 

1. Exterior of left valve. Flag Pond. x % 

Fig. 2. Pecten (Chlamys) jeffersonilts Say 378 

2. Exterior of right valve. St. Mary's River. X Vz 

Fig. 3. Pecten jeffersonius var. edgeoombensis Dall 379 

3. Exterior of left valve. St. Mary's River. U. S. National 

Museum. X % 

Fig. 4. Pecten jeffersonius var. septenarius Say 379 

4. Exterior of right valve. Petersburg, Virginia. U. S. National 

Museum. x % 

Figs. 5a, 5b. Ostrea sell5:formi.s 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 PELECYPODA. 



PLATE CI 

PASS 

Figs, la, lb. OsTEEA trigonalis Conrad 381 

la. Exterior of lower valve. Greensboro. x % 
lb. Interior of the same valve. x % 

Pigs. 2-4. OsTREA cAROLiNENSis Conrad 381 

2. Interior of lower valve. Governor Run. x % 

3. Interior of upper valve. Same locality. x % 

4. Exterior of lower valve. Same locality. x % 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CI. 





la 



lb 




MOLLUSCA PELECYPODA. 



PLATE CII. 

PAQE 

Figs. 1, 2. OsTREA PERCEASSA Coiirad 382 

1. Exterior of upper valve. Magruder Ferry. x % 

2. Interior of lower valve. Same locality. X % 

Fig. 3. Melina maxillata (Deshayes) 383 

3. Exterior of right valve. Plum Point. X % 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE Oil. 




MOLLUSCA PELECYPODA. 



PLATE cm. 

PAGE 

Fig. 1. Melina maxillata ( Deshayes) 383 

1. Interior of broken valve showing hinge and ligament grooves. 

Jones Wharf. x % 

Figs. 2, 3. Atbina harkisii Dall 384 

2. Exterior of right valve. Pawpaw Point. x % 

3. Exterior of decorticated right valve. Jones Wharf. U. S. National 

Museum. (After Dall.) x % 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE Clll. 



/^y^^ 




MOLLUSCA — PELECYPODA. 



PLATE CIV. 

PiQE 

Fig. 1. Athina piscatoria n. sp 384 

1. Exterior of right valve. Fishing Creek, x % 

Figs. 2-3b. Arca (Scapharca) subrostrata Conrad 385 

2. Interior of right valve. Plum Point. 
3a. Exterior of right valve. Same locality. 
3b. Exterior of right valve. Same locality. 

Figs. 4a, 4b. Aeca ( Scapharca) elnia n. sp 386 

4a. Exterior of right valve. Jones Wharf. 
4b. Interior of right valve. Same locality. 



1VIARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CIV. 




MOLLUSCA — PELECYPODA. 



PLATE CV. 



Fig. 1. Arca (Scapharca) clisia Dall 

1. Interior of left valve. Nomini Cliffs, Virginia. 
Museum. 56 mm. (After Dall.) 



PAOE 

386 



U. S. National 



Figs. 2-6. Arca (Scapharca) staminea Say 

2. Interior of left valve. Flag Pond. 

3. 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. 



387 



Figs. 7a, 7b. Arca (Scapharca) arata Say 

7a. Interior of right valve. St. Mary's River. 
7b. Exterior of left valve. Same locality. 



388 



97 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CV. 










7a 



7b 



MOLLUSCA PELECYPODA. 



PLATE CVI. 

PAGE 

Figs. 1. 2. Arca (Scapharca) idoxea Conrad 389 

1. Interior of left valve. St. Mary's River. 

2. Exterior of right valve. Same locality. 

Figs. 3, 4. Arca (Noetia) incile Say 390 

3. Exterior of right valve. Darlington, South Carolina. Johns 

Hopkins University. 

4. Interior of left valve. Same locality. 

Figs. 5, 6. Arca (Barbatia) oentexaria Say 391 

5. Interior of right valve. Jones Wharf. 

6. Exterior of left valve. Same locality. 

Fig. 7. Arca (Barbatia) mahylandica Conrad 392 

7. Exterior of right valve. Plum Point. U. S. National Museum. 

Fig. 8. Arca (Barbatia) vir(11.ni.e Wagner 392 

8. Exterior of left valve of type specimen. Miocene of Virginia 

(Nansemond River?) 84 mm. Wagner Free Inst. Sci. (After 
Dall.) 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CVI. 











MOLLUSCA — PELECYPODA. 



PLATE CVII. 

PAGE 

Figs. 1, 2. Glycymeeis parilis (Conrad) 393 

1. Interior. 3 miles soutti of Fishing Creelc. x 5/6 

2. Exterior of opposite valve. Same locality. x 5/6 

Figs. 3, 4. Glycymeris .subovata (Say) 394 

■3. Interior. Greensboro. 

4. Exterior. Same locality. 

Figs. 5-S. Leda liciata (Conrad) 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. 

Figs. 9, 10. Leda liciata var. ajiydra Dall 396 

9. Interior of left valve. Plum Point. 
10. Exterior of left valve. Same locality. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CVII. 













MOLLUSCA — PELECYPODA. 



PLATE CVIII. 

PAGE 

Figs. 1, 2. Leda concenteica (Say) 397 

1. Interior of right valve. Pocomoke City Well, 53 to 75 feet from 

surface. 

2. Exterior of right valve. Same locality. 

Pigs. 3, 4. YoLDiA LEVIS ( Say) 397 

3. Interior of right valve. Jones Wharf. 

4. Exterior of left valve. Same locality. 

Figs. 5, 6. NucDLA PROXiMA Say 398 

5. Exterior of right valve. Dover Bridge. 

6. Interior of left valve. Same locality. 

Figs. 7, 8. NuciJLA siNARiA Dall 399 

7. Interior of left valve. Cove Point. 

8. Exterior of right valve. Same locality. 

Figs. 9-11. NucuLA TAPHRiA Dall 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. 

Figs. 12-14. NucuLA prunicola Dall 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. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CVIII. 









"^'^^S^^:^ 14 



MOLLUSCA PELECYPODA. 



PLATE CIX. 

PAOE 

Figs. 1-3. DisciMiscA LuouBRis (Conrad) 402 

la. Exterior of dorsal valve. Jones Wharf. 

lb. 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. 

Pigs. 4, 5. Theonoa gi-omerata n. sp 406 

4a. Upper surface of a large specimen. St. Mary's River. x % 

4b. 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. Idmonea ( ?) expansa n. sp 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 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CIX. 




MOLLUSCOIDEA — BRACHIOPODA AND ERYOZOA. 



PLATE ex. 

PAGE 

Fig. 1. Membrakipora fo.ssulifera n. sp 408 

1. Portion of the surface of a fine specimen. Reed's. ,x 16 

Figs. 2-5. Memeranxpora oblongula n. sp 407 

2. Surface of an average specimen. Governor Run. x 20 

3. Surface of anotlier specimen liaving tliiclcer 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 

Fig. 6. Microporella pr.eciliata n. sp 415 

6. Portion of a zoarium of this species growing on Pecten madison- 

iiiS. The ovicells are more abundant on specimen than usual. 
Cove Point. x 16 

Fig. 7. Microporella inflata n. sp 416 

7. Portion of the surface of a specimen growing on a small molUisk. 

Jones Wharf. x 16 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CX. 










M& 









MOLLUSCOIDEA — BRYOZOA. 



PLATE CXI. 

PAGE 

Figs. 1, 2. MEMnR.\NiPOR.\ parvula n. sp 410 

1. A portion of llie surface. Reed's, x 16 

2. Another portion of the same. X 16 

Figs. 3, 4. Mejibraxii'ora caminosa n. sp 409 

3. Portion of a well-preserved specimen having ovicells. Jones 

Wharf. X 16 

4. Portion of another specimen not so well preserved and having very 

tew ovicells. Same locality, x 16 

Figs. 5-7. Retepora doverensis n. sp 422 

5. Celluliferous surface of a small fragment. Dover Bridge. x32/5 

6. A few cells of same. x24 

7. Portion of the reverse side of another fragment from the same 

locality, x 32/5 

Figs. 8, 9. Membranipora germana n. sp 410 

8. A portion of the surface of a specimen in good condition, x 16 

9. Another portion of the same. x 16 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXI. 




MOLLUSCOIDE.X — BRYOZOA. 



PLATE CXII. 

PAGE 

Fig. 1. Membranipoba nitiddla n. sp 412 

1. Surface of rather well-preserved fragment. Pawpaw Point, x 16 

Figs. 2-4. Membranipoha bifoliata n. sp 411 

2. Dorsal face of one of the two layers of zooecia. Jones Wharf. 

;< 16 

3. Surface of young specimen. Same locality, x 16 

4. Surface of an old specimen. Same locality, x 16 

Fig. 5. Mejibraxipora fistila n. sp 413 

5. The fragment upon which this species is founded. St. Mary's 

River, x 32/5 

Fig. 6. Cupularia denticulata (?) (Conrad) 414 

6. Portion of the surface of the specimen described. St. Mary's 

River, x 16 

Figs. 7a, 7b. AMPiiiBLESTRrii agellus n. sp 414 

7a. One of several small patches of this species growing on Pecten 

■maclisonius. Cove Point, x 16 
7b. A number of the zooecia of same in outline, x 34 



104 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXII. 




MOLLUSCOIDEA — BRYOZOA. 



PLATE CXIII. 

PAGE 

Figs. 1, 2. Lepralia ( ?) reversa n. sp 426 

1. Portion ot one of several patclies of tliis species, sliowing zooecia 

with til in raised borders. Cove Point. X 16 

2. Portion of another zoarium of which nearly all the zooecia are 

provided with ovicells. On Pecten madisonius. Same locality. 
X 16 

Fig. 3. Mickoporella pr.eciliata n. sp 415 

3. Portion of specimen not well preserved and somewhat doubtfully 

referred to this species. Ovicells are wanting. Jones Wharf. 
X 16- 

Figs. 4, 5. Adeonellopsis umbilicata (Lonsdale) 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 

Figs. 6-8. Microporella (?) iufoliata n. sp 417 

6. Surface of a fragment, illustrating appearance in young specimens. 

Cordova, x 16 

7. Portion of another fragment having ovicells. Same locality, x 16 

8. Portion of a third piece from Cordova, showing adult appearance. 

X 16 



106 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXIII. 







MOLLUSCOIDEA — BRYOZOA. 



PLATE CXIV. 

PAGE 
Fig. 1. SCHIZOPORELLA SUBQUADKATA n. Sp 420 

1. Finely preserved specimen of this species. Governor Run. X5 

Figs. 2-4. SCHIZOPOEELLA LATISINUATA D. Sp 421 

2. A patch of this species. Jones Wharf. x 32/5 

3. Another patch from the same locality. x 32/5 

4. One zooecium of same. x 24 

Pig. 5. Adeoneixopsis tjmbilicata (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 IG 

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. X 16 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXIV. 





MOLLUSCOIDEA BRVOZOA. 



cxv. 

PAGE 

Figs. 1-5. Retepora doverensis n. sp 422 

1. View of a small specimen. Dover Bridge. x % 

2. Another specimen. Same locality. X % 

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 

Figs. 6, 7. Amphiblestrum constrictum n. sp 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 

Figs. 8a, 8b, 9. Lepralia maculata n. sp 423 

8a. A specimen growing, as usual, upon a small mollusk and having 

the surface elevations or " maculae " unusually well developed. 

Plum Point. x % 
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. 





^ 



3 2 













8b 9 

MOLLUSCOIDEA — BRYOZOA. 



PLATE CXVI. 

PAGE 

Fig. 1. Palmicellaria punctata n. sp 428 

1. View of the specimen described. Reed's. x 16 

Figs. 2-4. Palmicellaria cokvoluta n. sp 427 

2. View of a specimen illustrating the mode of growth believed to 

characterize this species. Reed's. x % 

3. View of a fragment. Same locality. X 16 

4. Portion of another fragment showing several of the problematical 

closed cells. Same locality. x 16 

Fig. 5. Lepralia montifeba n. sp 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. x 16 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXVI. 




MOLLUSCOIDEA BRYOZOA. 



PLATE CXVII. 

PAQB 

Fig. 1. SCHIZOPORELLA DOVEKENSIS n. Sp 421 

1. Portion of surface. Dover Bridge. x 16 

Fig. 2. Leprali.\ marylandica n. sp 425 

2. Portion of a patch growing on Pecten madisonius. Cove Point. 

X 16 

Figs. 3, 4. Ceixepora massalis n. sp 428 

3. 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 

Figs. 5, 6. Cellepora cbibrosa n. sp 429 

5. A small compressed mass. Reed's. x 16 

6. Outline figure of orifice. x 24 

Pig. 7. Schizoporella cumulata n. sp 422 

7. Portion of the surface of the specimen described. Jones Wharf. 

X 16 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXVII. 




MOLLUSCOIDEA — BRVOZOA. 



PLATE CXVIII. 

FAOB 

Figs. 1-4. Crisina striatopora n. sp 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. X 17 

4. View of the brolven end of one of the brandies of the same. x 17 

Figs. 5, 6. SCHIZOPORELLA SUBQUADRATA n. Sp 420 

5. Part of the specimen figured on Plate CXIV. x 17 

6. One zooecium of a specimen from Governor Run. X 19% 

Fig. 7. Lepralia maculata n. sp 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. x 17 

Figs. 8-10. Lepbaiia ( ?) revebsa n. sp 426 

8. Several zooecia of a specimen having ovicells. X 28V2 

9. Several zooecia of another specimen having ovicells. X ZSYq 

10. Several zooecia having boundaries unusually well defined. 

X 281/2 

Fig. 11. Microporella pr.eciliata n. sp 415 

11. Two zooecia of the specimens figured on Plate CXIII, Fig. 3. 

X 281/2 

Figs. 12, 13. Microporella ( ?) bifoliata n. sp 417 

12. A zooecium and an avicularium. x 28% 

13. Two zooecia with ovicells. X 28% 

Fig. 14. Amphiblestrum agellus n. sp 414 

14. View of a single zooecium and portions of several adjoining ones. 

X 281/2 

Fig. 15. Amphiblestrum constrictum n. sp 413 

15. Several zooecia with ovicells. X 17 

Figs. 16, 17. Cellepora massalis n. sp 428 

16. Front view of a zooecium of the specimen figured on Plate 

CXVII, Fig. 3. St. Mary's River. x 17 

17. Profile view of the same. St. Mary's River. x 17 

Fig. 18. Spirobbis calvertensis n. sp 430 

18. View of several individuals attached to the surface of a Turri- 

tella. Plum Point. x 3/2 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXVIII. 



mm 









■fjS I J. . > 









12 








MOLLUSCOIDEA — BRYOZOA, AND VERMES. 



PLATE CXIX. 

PAGE 

Figs, la, lb, Ic. Echinocardium orthonotum Conrad 430 

la. Lateral surface of test. Jones Wharf, 
lb. Lower surface of same specimen. 
Ic. Upper surface of same specimen. 

Figs. 2, 2a. Scutella aberti Conrad 432 

2. Upper surface of test. Jones Wharf. 
2a. Enlarged plate of same specimen. 



MARYLAND GEOLOGICAL SURVEY, 



MIOCENE, PLATE CXIX. 








^i0^ 




2a 

ECHINODERMATA. 



PLATE CXX. 

PAOE 

Figs. la-2b. Scutella aberti Conrad 432 

la. Lower surface of test. Jones Wharf. 

lb. Lateral surface of test of same specimen. 

2a. Interambulacral plate. 

2b. Another view of the same (?). 

Fig. 3. Ophioderma (?) sp 433 

3. Fragment of arms. St. Mary's River. 



112 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXX. 




^??5^^^?^ 





'i, " 



' .*--^m 







PLATE CXXI. 

PAGE 

Pigs. 1-9. Htdractinia multispinosa n. sp 433 

1. 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 European H. circum- 
vesticus (Wood). 

4-7. Surface of four specimens showing slight variations partly due 
to preservation. x 8 

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 

Fig. 10. MiLLEASTER iNCBUSTANS n. gen. et. sp 436 

10. Surface of a specimen. U. S. National Museum. Plum Point. 



Figs. 11a, lib. MiLLEASTER (?) SUBRAMOSUS n. sp 437 

11a. The type specimen. Cove Point. 

lib. Another view of the same. The large openings are of small 
barnacles partly covered by the hydrozoan. x 4 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXI. 







COELENTERATA HYDROZOA. 



PLATE 'CXXII. 

PAOE 

Figs. 1-3. Paracyathus vaughani Gane 438 

1. View of several specimens attached to an oyster shell. 

Carter's Landing, Virginia. x % 

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. 

' The 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 CXXIL 





COELENTERATA ANTHOZOA. 



PLATE CXXIII. 

PAGE 
Figs. 1-4. ASTRHELIA PAI.MATA (GolclfuSS) 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. % to i-j 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 CXXIII 




COELENTERATA ANTHOZOA. 



PLATE CXXIV. 

PAGE 

Pigs. 1-4. AsTKAXGiA LixEATA (Conrad). (AH figures from the same 

specimen. ) 441 

1. General view of a colony attaclied to a Crepidula shell. 

Distance from top of uppermost corallite to lowest portion of 
shell as placed in Fig. 52 mm. x about 1% 

2. View of interior of a calice to show septal dentations. x about 5 

3. Enlarged view of costae. x 5 

4. Calicular view. x 5 

Figured specimen in collection of Johns Hopkins University. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXIV. 







r 




COELENTERATA — ANTHOZOA. 



PLATE CXXV. 

PAGE 

Figs. 1, 2. AsTRANGiA (ctENANGiA) Conradi n. sp 442 

1. General view of a specimen. Length 103 mm. x about 1% 

2. Several calices. x about 5 

Figured specimen in collection of Wagner Free Institute of Science. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXV. 





a&ii*w^ 



COELENTERATA ANTHOZOA. 



PLATE CXXVI. 

PAQB 

Figs. 1-2. Sept.^steea marylandica (Conrad) encrusting young, de- 
scribed by Conrad as Astrea marylandica 444 

la, lb. 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. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXVI. 





COELENTERATA ANTHOZOA. 



PLATE CXXVII. 

PAGE 

Pigs. 1-3. Septastrea marylaxdica (Conrad) 444 

1. Several caliees of a specimen enlarged to show initiation of repro- 

duction by dissepimental budding. Distance across the three 
caliees, 10 mm. x about 7 

2. Caliees of another specimen. A', A", young caliees, but so far 

advanced that one can not be sure which are the mother caliees. 
Immediately below A" is a young calice, apparently being 
formed by dissepimental budding. x 7 

3. Caliees of still another specimen, showing budding between the 

corners of the caliees. x about 6% 
Figured specimens in collection of Johns Hopkins University. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXVII. 



^'-^ 









4v. 




■^ '"• ^ / 



'-<. 



^* 










f^.l. 



COELENTERATA — ANTHOZOA. 



PLATE CXXVIII. 

PAGE 

Figs. 1, 2. Septastrea marylaxdica (Conrad) 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. 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXVIII. 



'^m^ 







COELENTERATA — ANTHOZOA. 



PLATE CXXIX. 

PAGE 

Septastrea martlandica (Conrad) 444 

General view of a specimen 175 mm. long, the figure slightly less than 

natural size. 
Figured specimen in collection of Johns Hopkins University. 



121 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXIX. 




COELENTER,\TA ANTHOZOA. 



PLATE CXXX. 

PAGE 

Figs. 1, 2. DiSTEPHANUS cRtTx ( Bhrenberg ) 448 

1. Pileated piece of skeleton. Cambridge artesian well (192 to 395 

feet). X 375 

2. Larger pileated piece of skeleton. Same locality. x 375 

Pig. 3. DicTYOcHA FIBULA ( ? ) Ehrenberg 449 

3. Pileated piece of skeleton. Cambridge artesian well (192-395 feet). 

X 375 

Fig. 4. LiTHOCAMPE MAEYLANDICA n. Sp 450 

4. Type specimen. Lyons Creek. x.187% 

Fig. 5. EUCYRTIDIUM CALVERTEXSE n. Sp 450 

5. Type specimen. Lyons Creek. x 1S7V2 

Figs. 6, 7. Stichocaps.\ macropora Vinassa 451 

6. A specimen from Richmond, Virginia. 

7. Another specimen. Same locality. 

Fig. 8. Anthocyrtium doronicum Haeckel 451 

8. A specimen from Popes Creek. x 240 

Fig. 9. Lithasteriscus radtatus Ehrenberg 453 

9. A specimen from Crisfield well (790 feet). x 225 

Fig. 10. Sponqasteriscus marylandicus n. sp 453 

10. View of type specimen. x 90 

Figs. 11-13. Dictyocoryne profunda Ehrenberg 454 

11. A specimen from Lyons Creek. x 90 

12. Another specimen. Same locality. x 90 

13. Another specimen. Same locality. x 90 

Fig. 14. RiiOPALonicTYiiM MARYLAxuiruM n. sp 455 

14. View of type specimen. Popes Creek. x 90 

Fig. 15. Rhopalodictyum calvertense n. sp 455 

15. View of type specimen. Lyons Creek. x 90 

Pig. 16. PoRODiscus coNCENTRicus (Ehrenberg) 455 

16. A specimen from Plum Point. x 162% 

Pig. 17. Phacooi.scus calvertanus n. sp 456 

17. A specimen from Lyons Creek. x 131 

Pig. 18. Cannartidum sp 456 

18. A specimen from Popes Creek. X112M! 

Pig. 19. Cannartiscus amphicylindricus Haeckel 457 

19. A specimen from Richmond, Virginia. x 195 

Pig. 20. Cannartiscus MARYLANnicus n. sp 457 

20. View of type specimen. Plum Point. x 187% 

Fig. 21. AcANTnosPH.ERA PARVULA Vinassa 458 

21. A specimen from Popes Creek. x 195 

Pig. 22. Hexalonche microsph-eka Vinassa 458 

22. A specimen from Plum Point. x 131 

Fig. 23. Hexastylus simplex Vinassa 459 

23. A specimen from Lyons Creek. x 150 

Figs. 24, 25. Cenosph.era porosissima Vinassa 459 

24. A specimen from Lyons Creek. x 131 

25. Another specimen. Plum Point. X162 Vz 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXX. 





PROTOZOA — RADIOLARIA. 



PLATE CXXXI. 

TAOE 

Pigs. 1-3. NoxioxiNA scAPHA ( Fichtel and Moll) 460 

1. A specimen from Chesapeake Beach. x 52% 

2. Another view of the same. X 52% 

3. Another specimen. Same locality. x 49 

Fig. 4. PoLYSTOMELLA sTRiATOPuscTATA (Fichtel and Moll) 462 

Jones Wharf. x 47 

Fig. 5. Descorbina orbicularis (Terquem) 463 

Jones Wharf. x 73 

Fig. 6. Planorbulina mediterranensis d'Orbigny 463 

Chesapeake Beach. x 33 

Figs. 7, 8. Truncatulina lobatula (Walker and Jacob) 464 

7. Specimen from Jones Wharf. x 55% 

8. Another specimen. Same locality. x 44 

Figs. 9, 10. Truncatulina variabilis d'Orbigny 465 

9. Specimen from Jones Wharf. X 41 
10. Another specimen. Same locality. X 58% 

Fig. 11. Anomalina grosserugosa (Giimbel) 466 

Chesapeake Beach. x 50 

Figs. 12, 13. Rotalia beccarii (Linne) 467 

12. Specimen from Cove Point, x 48 

13. Another view of same ?. 

Fig. 14. Rotalia beccarii var. briuckhiana Karrer 467 

1 mile north of Governor Run. X 56 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXXI, 














12 -■^..^■^' 13 

PROTOZOA — FORAMINIFERA. 



PLATE CXXXII. 

PAGE 

Figs. 1, 2, GLor.iGERixA nuLLOiiiES d'Orbigny 468 

1. Specimen from Chesapealie Beach, x 40 

2. Anotlier specimen. Same locality, x 42 

Fig. 3. Globigebina ceetacea d'Orbigny 469 

Chesapeake Beach, x 60 

Fig. 4. Textularia adbreviata d'Orbigny 470 

Governor Run. X 46 

Fig. 5. Textularia agghttinans d'Orbigny 470 

Governor Run. X 43% 

Figs. G, 7. Textularia akticulata d'Orbigny 471 

6. Specimen from Chesapeake Beach, x 52% 

7. End view of the same. 

Figs. 8, 9. Textularia gramen d'Orbigny 471 

8. Specimen from Jones Wharf, x 34 

9. Another viev/ of the same. 

Fig. 10. Textularia carinata d'Orbigny 472 

Chesapeake Beach, x 45 

Figs. 11, 12. Textularia s.\gittul.\ Defrance 472 

11. Specimen from Plum Point, x 40VL' 

12. End view of the same. 

Fig. 13. TEXTULAniA sunAXGULATA d'Orbigny 473 

Governor Run. X 48 

Fig. 14. BoLivixA BEYRiciiii var. alata Seguenza 473 

Chesapeake Beach, x 47% 

Fig. 15. Cristellari.\ cultrata (Montfort) 474 

Crisfield well (776 feet), x 30 

Fig. 16. Cristellaria wetiierellii (Jones) 475 

Crisfield well (776 feet). X 20 V2 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXXII. 




PROTOZOA — FORAMINIFErL\. 



PLATE CXXXIII. 

PAGE 

Pig. 1. PoLYMORPHiNA COMPRESSA d'Oi'bigny 476 

Chesapeake Beach, x 41 

Fig. 2. PoLTMORPHiNA co.MPRESSA vaf. STRIATA n. var 476 

Type specimen. Jones Wharf, x 30 

Fig. 3. PoLYMORPiiiKA ELEGANTissiMA Parlier and Jones 476 

Chesapeake Beach. X 42% 

Fig. 4. POLYMORPHINA GiBBA (d'Oibiguy) 477 

Chesapeake Beach, x 70 

Figs. 5, 6. PoLYMORPiiiNA LACTEA (Walkei' and Jacob) 477 

5. Specimen from Jones Wharf, x 38% 
C. Another view of the same. 

Fig. 7. PoLY'MORPHiNA REGiNA Brady, Parlser and Jones 478 

Chesapeake Beach.' x 39% 

Fig. 8. UviGERiNA CANARiENSis d'Orbigny 478 

Crisfield well (776 feet), x 58 

Fig. 9. UviGERiNA PY'GM.-EA d'Orbigny 479 

Norfolk well (C45 feet), x 28 

Fig. 10. UVIGERINA TENUISTRIATA Reuss 479 

Crisfield well (776 feet). X 38^/2 

Fig. 11. Sagrina spinosa n. sp 480 

Type specimen. Jones Wharf. X 38% 

Fig. 12. MiLioLiNA SEMiNULUM (Llnne) 481 

Jones Wharf. X 33 

Fig. 13. Spiroloculina tenuis (Czjzek) 483 

Leonardtown. x 52% 

Fig. 14. Spieoloci'lina grata Terquem 482 

Chesapeake Beach. X 27 



126 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXXIII. 
















PROTOZOA — FORAMINIFERA. 



PLATE CXXXIV. 

PAGE 

Fig. 1. AcTiKOCYCLUS ELLiPTicus Grunow. X 3331/3 502 

Fig. 2. AcTixocYLUS MONiLii-oRMis Ralts. X 333% 502 

Fig. 3. ACTINOPTYCHUS HELIOPELTA Gfunow. X 166% i^9 

Fig. 4. AcTiNOPTYCHUS UNDULATUS (Kiitzing). X 333% 499 

Fig. 5. ArLAcoDiscus rogehsii (Bailey), x 166% 497 

Fig. 6. BiDDULPHiA ACUTA (Ehrenberg). X SSSVs 492 

Fig. 7. BiDDULPHiA cOiNDEcoRA (Ehrenberg) . X 333% 492 

Fig. 8. BiDDULniiA decipiens Grunow. X 333% 493 

Fig. 9. BinDULPHiA inteepunctata (Grunow). X 333% 494 

Fig. 10. BIDDULPHIA sEMitiRCULAius (Briglitwoll) . X 333% 494 

Fig. 11. BIDDULPHIA SUBORBICULAEIS GrUHOW. X 333% 495 

Fig. 12. BIDDULPHIA TESSELLATA (Greville) . X 3331/3 495 

Fig. 13. CosciNODiscus apiculatus Elirenberg. X 333% 



Fig. 15. CoscixoDisci'S heteroporus Ehrenberg. X 333% . 
Fig. 16. CoscixoDiscus lewisianus Greville. x 333%.... 



503 



Fig. 14. CosciNODiscus asteeoides Truan and Witt. X 333% 504 



505 
505 



128 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXXIV. 




PLANTiE — THALLOPHYTA, DIATOM ACE.E. 



PLATE CXXXV. 

PACK 

Fig. 1. CoscixoDiscus ltneatus Ehrenberg. X 333% 506 

Fig. 2. CosciNODiscrs perfoeatus Ehrenberg. X 333% 50G 

Pig. 3. CRA.sPEDODi.scrs cosciNODiscus Ehrenberg. x 333% 500 

Fig. 4. CRAsrEDODiscus ELEGANs Ehrenberg. X 166% 501 

Fig. 5. DiPLO.NEis luciiOTATOs var. christiaxii Cleve. X 333% 4S7 

Figs. 6, 7. El roDiscus ixcoxsi'icuus Rattray, x 333% 498 

Fig. 8. Graya argoxauta Grove and Brun. X 333% 496 

Fig. 9. Paralia sulcata (Ehrenberg) Cleve. x 333% 491 

Fig. 10. PsEUDAULiscus SPixosus (Christian). X 333% 497 

Fig. 11. RiiAPiioNEis GEMMii'ERA Ehrenberg. X 333% 488 

Fig. 12. ScEPTROXEis CADiicEus Ehrenberg. x 333% 489 

Fig. 13. Stephaxopyxis coroka (Ehrenberg). x 333% 490 



MARYLAND GEOLOGICAL SURVEY. 



MIOCENE, PLATE CXXXV. 




PLANT.B — TIIALLOPHVTA, DIATOM ACEvE. 



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