Pterygotus buffaloensis Pohlman 
Page 358 
See plates 57, 67, 68, 70, 74-82 
1 Carapace of large specimen showing normal outline, facettae of com- 
pound eyes and traces of ornamentation. Natural size 
2 Telson of large specimen, showing median keel and spines and marginal 
serrations. Natural size 
Horizon and locality. Bertie waterlime. Buffalo, N. Y. 
The originals are in the museum of the Buffalo Society of Natural Sciences 
586 
