PLATE XI. 



Page. 



NCCULA MONMOUTHKNSIS Wbittield 102 



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

 Nl'cula Slackiana Gabb 103 



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

 3. Left valve of a larger example. 



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 PINXAFORMIS 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. 



Nucur.ANA COMPRESSIFRONS Conrad 109 



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



NUCULAXA PHOTEXTA Gabb 105 



Fig. 10. Viewofthes])ecimenfiguredbyMr. Gabb as the type of the species, partially restored. 



Nucui.ANA Gahbana 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. 



PERIilSONOTA PUOTEXTA Courad 110 



Fig. 14. Enlarged view of ihe type specimeu. 

 15. A further enlargement of the hinge. 



NTJCUI.ANA LOXGIKROXS Courad 107 



I ig. 16. Exterior of one of the type specimens. 



17. Eulargemeut of the hinge showing the teeth. 



NUCULARIA PAPYRI A Conrad Ill 



Fig. 18. View of a shell enlarged. 



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



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



from the original types. 

 ClBOTA MULTIRADIATA Gabb 94 



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

 22. Cardinal view of the same. 

 AxiXEA MoRTOXi Conrad 99 



Fig. 2J. Rigbt view of a specimen preserving the shell. 



24. Cardiniil view of thi' same. 



25. A cast showing the character of the teeth. 



AXIXEA 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 crenulatious of the margin. 



ClBOTA OBESA WhitticJd 93 



Fig. 30. Eight view of the specimen described. 

 31. Basal view of the same. 



ClBOTA UNloPsis 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. 



ClBOTA ROSTELLATA Morton 91 



Fig. 34. Rigbt 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. 

 290 



