fivirnjifM 



PLATE XLVI. 



NUCULA BELLISTBIATA. 



Page 318. ,( Si ,M .; .: i 



Fig. 1. A right valve, natural size. <» nA «f - i'l 



Hamilton group. Delphi, N. Y. 

 Fig. 2. A right valve enlarged to two diametere, showing the surface markings and anterior musculai" 



scar. Hamilton group. Northtnlle, Cayuga Co., iV. T^ . 

 Fig. 3 A right valve of broader form than usual, enlarged.  



Figs. 4, 5. Two left valves enlarged, showing the foi-m and surface charactera. 

 Fig. 6. A large left valve, natural size. 



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

 Fig. 7. A specimen preserving both valves, enlarged. 



Hamilton g:-oup. Tinker's falls, Onondaga Co., ^. T. 

 Fig. 8. An enlargement of the surface, from fig. 1 . 

 Fig. 9. A cardinal view of a cast, enlarged. 



Hamilton groiip. Shore of Canandaigua lake, JV. Y. 



NCCULA CORBULIFORMIS ? 



Page 319. 

 Figs. 10, 11. Left and cardinal views of a cast of the interior, showing the muscular scars and hinge 

 crenulations. 



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

 Figs. 35, 36. Left and cardinal views of a compressed specimen, showing characters similar to the pi-eeed- 



ing, enlarged to two diameters. 

 Fig. 37. A partial cast of a right valve of obscure character, enlarged. 

 Lower Chemung group. Ithaca, N. Y. 



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