PI.ATE XXXIX. 



MODIOMORPHA 8UBALATA. 



Vage 283. 

 See Plate 3a. 

 Fif.'s. 1-14, 16. Illustrations showing: the pliiises of this species from the smaller' individuals to the larger 

 anil full-grown forms. 



Hamilton group. 



MODIOMOKPHA SUBALATA, V:ir. ChEMUNGENSIS. 

 Page 284. 

 See Plat* 41. 

 Fig. l."). A cardinal \new of a crushed specimen. 



Chemung group. Ithaca, N. Y. 



MODIOMORl'HA MACILENIA. 



Page' 280. 

 See Plate 37. 

 Fig»<. 17-20. Two small left and two large right valves, fig. 20 i-epresenting a specimen of unusual size. 



Hamilton group. 

 Fig. 21. A cardinal view of a crushed specimen showing the ligamental area with the ligament partially 

 presers-ed. 



Hamilton group. Pnm a boulder of shale in Catherine township, Schuyler Co., N. Y. 



