1286 NEW YORK STATE MUSEUM 



PLATE 24 



Hughmilleria socialis sp. nov. 



Page 1091 



1 The free portion of the opercular appendage of a female 

 showing the point of overlap and fusion of the two parts. x2 



Eurypterus pittsfordensis sp. nov. 



Page 1098 



2 Fragment of sternite showing median cleft, transversal 

 suture and lobe of anterolateral angles. Natural size 



3 Metastoma showing notch and minute dentation of anterior 

 end. Natural size 



4 Coxa! joint of fourth endognathite. x2V2 



5 Female opercular appendage. Natural size 



Pterygotus sp. 



Page 1104 



6 Fragment of free ramus of chela. x4 



Pterygotus monroensis sp. nov. 



Page 1102 



7 Cephalothorax. Natural size 



Pterygotus sp. 



Page 1104 



8 Metastoma. Natural size 



Pterygotus monroensis sp. nov. 



Page 1102 



9 Part of proximal joint of preoral appendage. Natural size 



