PLATE LXV— Continued. 

 SpHENOTUS 8UBTOKTUOSUS. 



Page .'i97. 

 Pig-. 18. A left valve. 



Hamilton group. Schoharie Co., N. Y. 



Fijf. 19. A somewhat smaller left valve. 



Hamilton group. York, Livingston Co., N. Y. 



GoNioPHORA Ida. 



Pa«:e 300. 

 See Plate 42. 

 ¥ig. 20. A specimen preserving both valves. 



Hamilton group. Genesee, Livingston Co., N. Y. 



Sphenotus solenoides. 



Page 398. 

 Figs. 21-23. lliree small left valves. 



Fig. 24. A right valve of medium size. 



Pigs. 2.5, 26. Left side and cardinal views of a specimen which is somewhat compressed vertically. 



Hamilton group. iShore of Canandaigua lake, N. Y. 

 Fig. 27. The right side of a specimen presei-ving both valves. 



Hamilton group. Bellona, N. Y. 

 Fig. 28. A large right valve. 



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

 Fig. 29. An enlargement of the posterior portion of the specimen fig. 22 showing the vascular-like marking!^. 



