PLATE XI. 



Page. 

 NUCULA MONMOUTHENSIS Wliittield 102 



Fig. 1. View of a left valve, natural size. 



NucuLA Slackiana Gabb 103 



Fig. 2. View of the right side of the type specimen. 

 3. Left valve of a larger exami)le. 



Nucula percrassa Conrad 102 



Fig. 4. View of a specimen from the micaceous clays below the Lower Marls near Marl- 

 borough, N. J. 

 5 and 6. Views of a cast supposed to be from Haddonfield. 



NUCULANA PINNAFORMIS Gabb 108 



Fig. 7. View of the type specimen, enlarged three diameters. 



8. View of a more elongated form, presumably of the same species, enlarged four diam- 

 eters. 



NUCULANA COMPRESSIFRONS Conrad 109 



Fig. 9. View of one of the type specimens greatly enlarged. 



NucuLANA PKOTEXTA Gabb 105 



Vig. 10. View of the specimen figured by Mr. Gabb as the type of the species, partially restored. 



NucuLANA Gabbana Whitfield 106 



Fig. 11. View of a small individual corresponding to Mr. Gabb's figure. 



12 and 13. Views of the specimen from Princeton College; both enlarged. 



Perrisonota protexta Conrad 110 



Fig. 14. Enlarged view of the type specimen. 

 15. A further enlargement of the hing^. 



Ntjculana longifrons Courad 107 



lig. 16. Exterior of one of the type specimens. 



17. Enlargement of the hinge showing the teeth. 



NUCULARIA PAPYRIA Conrad Ill 



Fig. 18. View of a shell enlarged. 



19. View of a cast of a right valve, enlarged. 



20. Enlargement of a fragment preserving a few of the teeth. The specimens are all 



from the original types. 



ClBOTA MULTIRADIATA Gabb 94 



Fig. 21. Left view of the type specimen, natural size. 

 22. Cardinal view of the same. 

 AxiNEA MoRTONi Courad 99 



Fig. 23. Right view of a specimen preserving the shell. 



24. Cardinal view of the same. 



25. A cast showing the character of the teeth. 



Axinea alta Whitfield 101 



Fig. 26. Lateral view of a cast, showing the elevated beaks, etc. 



27. Profile view of the same. 



28. View of a cast which preserves the form of the teeth in part. 



29. View of a similar cast, showing the crenulations of the margin. 



CiBOTA OBESA Whitfield 93 



Fig. 30. Right view of the specimen described. 

 31. Basal view of the same. 



CiBOTA UNiopsis Conrad 



Fig. 32. Left view of a cast of the species. Collection of the American Museum of Natural 92 



History. 

 33. Cardinal view of the same. 



CiBOTA ROSTELLATA Morton 91 



* Fig. 34. Right view of a characteristic example of the species (a cast). 



35. Cardinal view of the same. 



36. View of a cast of a left valve, retaining the surface features more distinctly 



marked than on the other. 



2<)0 



