PLATE XL VIII. 



PaL^ONEILO CONSXUICTA. 

 Page 333. 

 See Plate 51. 

 Figs. 1-3. Three right valves of somewhat diffei'ent proportions. 

 Hamilton group. Central New Yin'k. 

 4, 5. Two right valves. 

 6. Cardinal view of a cast of the interior. 



An enlargement of a specimen retaining the valves in conjun<^tion. 



Hamilton group. BeUona, Yates Co., N. T. 

 A left valve enlarged showing the crenulations of the hinge-line. 



Hamilton group iShttre of Cayuga Jake, N. Y. 

 A cast of a left valve, enlarged to two diameters. 



Hamilton group. Near Cumberland, Aid. 

 A gutta-percha impression from the jireceding, showing the chai-acter of the interior, enlarged. 

 An enlargement of the surface from the specimen tig. S. 



A cast of the interior of a left valve showing muscular impressions and qrejiulated hinge, enlarged. 

 Hamilton group. Pultonhain, Scholiarw Co., N. Y. ihiilinK:! 



13. A partial cast of a right valve showing the crenulations of the hinge, and preserving the shell and 

 markings along the pallial line, enlarged. 



Hamilton group. Bear's gulf, ScJwharie Co., N. Y. 



14. A cast of two valves in conjunction showing the muscular scars and hinge crenulations, enlarged. 

 Hamilton group. Near Ouiiiberland. Md. 



15. An enlargement of the hinge from the specimen fig. 9. 



16. A cast of a small individual, somewhat more nasute at the posterior extremity than usual. 

 Lower Chemung group. Near Ithaca, N. Y. 



-K ,Te .egi'l 



Figs. 



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Fig. 



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 Fig. 



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7. 



8. 



10. 

 11. 



12. 



