PLATE LXliL 
Gkammysia bkllatula. 
Page 367. 
Fig-. 1. A small block of shale preserving two valves, probably of the same individual. 
Hamilton group. York Center, Livingston Co., N. Y. 
Figs. 2, 3. The two valves enlarged. 
Gkammysia zo n at a . 
Page 373. 
Fig. 4. A left valve, enlarged. 
Hamilton group. Schoharie Co., N. Y. 
Fig. 5. A specimen retaining both valves in conjunction. In the left valve the ridge on the umbonal 
slope is due to a fracture and exaggerated in the figure 
Gkammysia arcuata ? 
Page 373. 
See Plates 61, 93. 
Fig. 6. The left valve of a cast of the interior. The ridge on the umbonal slope is probably due to a 
fracture in the shell. 
Hamilton group. Eighteen Mile creek, N. Y. 
Gkammysia Eriopia. 
Page 36S. 
Fig. 7. A right valve. The umbo is represented as too narrow in the figure, and the apparent furrow on 
the post-cardinal slope is a g-entle fold. 
Hamilton group. Shore of Seneca lake, N. Y. 
Fig. 8 A large right valve. 
Hamilton group. Shore of Canandaigua lake, N. Y. 
EdMONDIA ? TJ5NUISTRIATA. 
Page 393. 
See Plate 95. 
Fig. 9. An imperfect right valve. 
Chemung group. Near Elmira, N. Y. 
Fig. 10. An enlargement of the surface showing the concentric lines of growth and radiating- strite. 
