1288^ NEW YORK STATE MUSEUM 



PLATE 25 



Hughmilleria socialis sp. nov. 



Page 1091 



1 Male operculate appendage. Natural size 



3 Ventral view, showing metastoma and one gnathobase in 

 position. Natural size 



4 Swimming foot, disjointed, showing the form of the joints. 



x2i/ 2 



Eurypterus pittsfordensis sp. nov. 

 Page 1098 



2 Male operculate appendage. Operculum shows median cleft 

 and transversal suture. Natural size t 



5 Female second sternite, showing genital appendages. Nat- 

 ural size 



6 Large sternite, showing transversal suture. Natural size 



