PLATE LY. 
Gkammysia nodocostata. 
Page 360. 
See Plates 56, 57, 96. 
Pig. 1. A small specimen preserving both valves and showing the characteristic ornamentation. 
Hamilton group. Madison Co., N. Y. 
Figs. 2-4. Anterior, posterior and cardinal views of a specimen vertically compressed. 
Hamilton group. Madison Co., N. Y. 
Figs. 5, 6. Left side and cardinal view of a small individual, showing the surface ornaments in a very satis¬ 
factory manner. 
Figs. 7-9. Left, anterior and posterior views of a large specimen which is vertically compressed, making 
the valves much narrower and deeper than natural. 
Hamilton group. Madison Co., N. Y. 
Fig. 10. A fragment of a left valve preserving the surface ornaments. 
Hamilton group. Shore of Cayuga lake, N. Y. 
Fig-. 11. An enlargement from the surface of the preceding. 
