PLATE LXV—Continued. 
Sphenotus subtortuosus. 
Page 397. 
Fig-. IS. A left valve. 
Hamilton group. Schoharie Co., N. Y. 
Fig. 19. A somewhat smaller left valve. 
Hamilton group. 
York, Livingston Co., N. Y. 
Goniopiiora Ida. 
Page 300. 
See Plate 42. 
Fig. 20. A specimen preserving- both valves. 
Hamilton group. Genesee, Livingston Co., N. Y. 
Sphenotus solenotdes. 
Figs. 21-23. Three small left valves. 
Pago 398. 
Fig. 24. A right valve of medium size. 
Figs. 25, 26. Left side and cardinal views of a specimen which is somewhat compressed vertically. 
Hamilton group. Shore of Canandaigua lake, N. Y. 
Fig. 27. The right side of a specimen preserving- both valves. 
Hamilton group. Bellona, N. Y. 
Fig. 28. A large right valve. 
Hamilton group. Shore of Canandaigua lake, N. l r . 
Fig. 29. An enlargement of the posterior portion of the specimen tig. 22 showing the vascula r-like markings 
