Pi,ATE XXXIX. 
jVIomomorpha subalata. 
Page 283. 
See Plate 35. 
1-14, 16. Illustrations showing- the phases of this species from the smaller individuals to the larger 
and full-grown forms. 
Hamilton group. 
Modiomorpha subalata, v;ir. Chemung ensis. 
Page 284. 
See Plate 41. 
15. A cardinal view of a crushed specimen. 
Chemung group. Ithaca, N. Y. 
M ODIOMORPIT A M AGILE NT A. 
Page; 280. 
See Plate 37. 
17-20. Two small left and two lai-g-e right valves, fig'. 20 representing-a specimen of unusual size. 
Hamilton group. 
21. A cardinal view of a crushed specimen showing the ligamental area with the ligament partially 
preserved. 
Hamilton group. From a boulder of shale in Catherine township, Schuyler Co., iV. Y. 
