PLATE XXXVII. 
MODIOMORPHA ALTA. 
Page 278. 
See Plate 80. 
Fig's. 1, 2, 7-12, 15, 16. These figures represent characteristic specimens of this species in its various 
phases of growth. Fig. 15 is the type specimen described by Mr. Conrad. 
Hamilton group. Shore of Seneca lake, N. Y. 
Figs. 4-6 are doubtfully referred to this species, approaching M. mytiloides in form. 
Modiomorpha mytiloides. 
Page 277. 
See Plate 38. 
Fig. 3. A small left, valve of this species. 
Hamilton group. Pratt's falls, N. Y. 
Modiomorpha affinis. 
Page 284. 
See Plate 35. 
Figs. 13, 14. Right and cardinal views of the specimen described. 
Hamilton group. Onondaga Co., N. Y. 
Modiomorpha macilknta. 
Page 280. 
See Plate 39. 
Fig. 17. The right side of a crushed specimen. 
Hamilton group. Prom a boulder of shale in Catherine township, Schuyler Co., N. Y. 
