PLATE XL. 
Amnigenia Catskillensis. 
Page 516. 
See Plate SO. 
Fig-. 1. A vertically compressed specimen, giving- a narrow aspect to the valve. 
This is the form originally described by Vanuxem as Cypricardites angustata. 
Fig-s. 2-4. The ordinary forms of this species. 
Oneonta sandstone. Near Ml. Upton, N. Y. 
Elymella eabalis. 
Page 502. 
Figs. 5, 9. Two specimens of ordinary size, retaining both valves. 
Hamilton group. Shore of Crooked lake, N. Y. 
Elymella nuculoides. 
Page 503. 
Figs. 6-8 (10?). Individuals showing the phases of the species as observed in the Hamilton group 
Elymella patula. 
Page 505. 
Fig. 11. A specimen preserving the two valves in conjunction. 
Waverly group. Medina, 0. 
Figs. 12, 20. Two right valves. 
Hamilton group. 
Glossites subtenuis. 
Page 495. 
Near Geneva, N. Y. 
Glossites amygdalinus. 
Page 501. 
Figs. 13, 14. A right valve, and a specimen preserving the two valves in conjunction. 
Yellow sandstone. Burlington, Iowa. 
Glossites depressus. 
Page 496. 
See Plate 96. 
Figs. 15, 17. Two left valves of this species. 
Chemung group. Ithaca and Elmira, N. Y. 
Glossites lingualis. 
Page 497. 
See Plate 96. 
Figs. 16, 19. A left and right valve as preserved in soft shales. 
Chemung- group. Belmont, N. Y. 
Fig. 
Mo dio morph a Tioga. 
18. A left valve. 
Chemung group. 
Page 291. 
Mansfield, Pa. 
