PLATE XL VII. i 



NUCUUTES OBLONGATUS. 

 Page 824. 

 Fig. 1. The cast of the interior of a left valve, partially preserving the surface strise. 



Hamilton group. Sltore of Otisco lake, N. Y. 

 Fig. 2. A cast of the interior of a specimen preserving the two valves in conjunction, and showing the 

 crenulated hinge. 



Hamilton group. Schoharie Co., N. Y. 

 Pig. 3. A cast of the intei-ior similar to the preceding. 



Hamilton grouj) Bear's gulf, Schoharie Co., N. Y. 

 Fig. 4. A cast of the interior of a right valve, showing the charactei-s of the hinge. 



Hamilton grouj). Shore of Skaiieateles lake, JV. Y. 

 Fig. 5. A large specimen similar to the preceding, showing more distinctly the muscular scars and pallial 

 line. 



Hamilton group. Bear's giilf, Schoharie Co., iV. Y. 

 Fig. 6. The interior of a right valve as obtained from a gutta-percha impression. 



Fig. 7. The interior of a large left valve as obtained from a gutta-percha impression from the natural 

 mould, tig. 9. 



Hamilton group. Near Cumberland, Md. 

 Pig. 8. An enlargement from the preceding. 



Fig. 9. A cast of a left valve preserving the muscular scai-s, pallial line and crenulations of the hinge, oi ! 

 Fig. 10. A right valve of short form, preserving the surface stria?. 

 Hamilton group. Shore of Cayuga lake, N. Y. 

 Figs. 11, 12. Right and cardinal views of a cast of the interior, showing muscular scare and hinge 

 ci-enulations. 



Hamilton group. Near Ciivibeiland, Md. 



A'UCULITES CUNEIFORMIS. 

 tune 325. 

 Pig. 13. A cast of a right valve. 



Hamilton group. Madison, Co., N. Y. 

 Fig. 14. A right valve, somewhat broader in the anterior portion. 



Hamilton group. Schoharie Co., N. Y. 

 Pig. 15. A cast of the interior, preserving the pallial line and some of the surface striae along the base. 



Hamilton group. FSdUmham, N. Y. 

 Pig. 16. A small left valve. 



Hamilton group. Jefferson, Schoharie Co., N. Y. 



