EXPLANATION OF PLATE XLIII. 



OSTREA DENTICUUFERA Conrad, ...................................... p. 436 



1-2. Internal and external views of two nearly complete valves, 

 identified by Conrad. (After Whitfield.) 



Woodbury clay; Haddonfield, (183}. 



OSTREA FALCATA Morton, ................. ........................... p. 444 



3-6. Views of four nearly perfect single valves. 



Marshalltown clay-marl; near Szvedesboro, (/77). 



OSTREA NASUTA Morton .............................................. p. 447 



7-8. Views of two nearly complete single valves. (After Whit- 

 field.) 



Nave sink marl. 



OSTREA MESENTERICA Morton, ........................................ p. 446 



9-14, Views of six nearly perfect single valves. 

 Navesink marl; near Holmdel, 



OSTREA MONMOUTHENSIS n. sp., ...................................... p. 442 



15. View of the type specimen. 



Navesink marl; near Crawfords Corner, (i.?6 7 )- 



OSTREA CONGESTA Conrad, ........................................... p. 435 



16. View of an internal cast of the attached valve. 



CKffwood clay; Cliffivood Point, '(105). 



OSTREA TECTICOSTA Gabb, ............................................ p. 443 



17-18. Views of two casts of single valves referred to this species. 



Wenonah sand; near Marlboro, (130). 

 19. Exterior view of the type specimen. (After Whitfield.) 



968 



