PLATE LVI. 



GrAMMYMA BISi;i,CATA. 

 Page 36». 

 See Plates 54, 93. 

 Fig-. 1. A left valve of a large individual of broad form. 

 Hamilton group. Ludlowville, N. Y. 



GrAMMYSIA N0D0C08TATA ? 

 Page 360. 

 See Plates 55, 57, 96. 

 Figs. 2, 3. The right and left sides of a sjwcimen which is obliquely compressed and distorted. 

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



Grammysia magna. 



Page 362. 

 See Plate 57. 

 Fig. 4. The right side of a partial cast of the interior. 



Hamilton group. Madison Co., N. Y. 

 Fig. 6. The right side of a specimen pi-esei-ving the two valves in conjunction. 



Lower Chemung group. Ithaca, N. Y. 

 Fig. 6. A large left valve which is a partial cast of the interior, presei-ving only the finer striae. 

 Fig. 7. A partial cast of a right valve preserving on the middle and anterior portions the stronger un- 

 dulations. 



Hamilton g^roup. Schoharie Co., N. Y. 



Grammysia erecta. 



Page 363. 

 See Plate 57. 

 Fig. 8. An imperfect right valve pi-eserving the umbonal and anterior portion. 

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



