PLATE XLIV. 



GONIOPHORA TRUNCATA. 



Page 298. 

 See Plate 42. 

 Fig-. 1. The right side of a crushed specimen showing the surface markings. 



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

 Fig. 2. The cardinal view of the preceding. 

 Fig. 3. The right valve of a large individual pi-eserving the surface markings, and showing the 



form of the shell. 

 Fig. 4. A fragment of a right valve showing the surface markings. 



Hamilton group. Delphi, N. Y. 

 Fig. 5. A portion of a right valve from a gutta-percha impression of the natural mould. 



natural 



Figs. 



GONIOPHORA CARINATA. 



I'agc 301. 

 See Plate 42. 

 6-8. A series of Bjjecimens showing the graxlation of form and size. 

 Hamilton group. Schoharie arid Otsego Co's, N. Y. 



Fig. 9. The left valve described. 



Chemung group. 



GONIOPHORA TRIGONA. 



Page SO-i. 



See Plate 42. 



Franklin, Delaware Co., N. Y. 



GONIOPHORA GlAUCUS. 

 Page 299. 

 See Plate 43. 

 Fig. 10. A large right valve in which the cardinal slope is narrowed from compression. 

 Fig. 11. A right valve. 



Hamilton group. Madison Co., N. Y. 

 Fig. 12. A partial cast of a right valve of short form, showing the anterior muscular impression and pallial 



line. Hamilton group. Near Apiclia, Onondaga Co., N. Y. 

 Fig. 13. A cast of the interior of a left valve showing the hinge area, the anterior muscular impression and 

 pallial line. 



Hamilton group. Bear's Qulf, Schoharie Co., N. Y. 

 Fig. 14. A gutta-jiercha iinpres.sion fi-om the preceding specimen. 

 Fig. 15. An unusually elongate left valve of this species. 



Hamilton gi-oup. Kellogsville, Cayuga Co., N. Y. 

 Fig. 16. A cast of a right valve preserving some remains of the shell, and showing the anterior muscular 

 impression and pallial line. 



Hamilton group. Schoharie Co., N. Y. 

 Fig. 17. A right valve of a specimen of medium size. 



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



