Pterygotus buffaloensis Pohlman 
Page 358 
See plates 57, 67, 68, 73-80 
t Dorsal view of a nearly complete specimen showing the general form of 
the body with walking and swimming legs; on the left side also the 
relative extension of the six tergites and five sternites. The numer- 
ous bilobed markings on the surface of the body are the impressions 
of ostracods which were in the habit of seeking shelter under and 
within the cast skins of the eurypterids. Natural size 
2 Portion of counterpart of the same specimen, showing the radiating 
wrinkles of the cornea of the compound eyes. Natural size 
3 Telson of a larger specimen showing the normal outline. Natural size 
Hortzon and locality. Bertie waterlime. Buffalo, N. Y. 
Figures 1 and 3 are from photographs. 
The original of figure 1 is in the National Museum; that of figure 2 in the 
museum of the Buffalo Society of Natural Sciences, and that of figure 
3 in the State Museum 
584 
