1268 NEW YORK STATE MUSEUM 



PLATE 15 



Eurypterus pittsfordensis sp. nov. 



Page 1098 



1 Gnathobase. Natural size 



2. Half of sternite showing transversal suture and cleft 

 3 Portion of endognathite doubtfully referred to this species, 

 probably fourth endognathite 



Hughmilleria socialis sp. nov. 



Page 1091 



4, 5 Two views of telsons, showing the dorsal carination. 

 Figure 4, x2 ; figure 5, xSy 2 

 6 Uncompressed telson. x2 



