1288 



NEW YORK STATE MUSEUM 



PLATE 25 



Hnghmilleria soeialis sp. no v. 



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. 



x2% 



Eurypteras pittsfordensis sp. no v. 



Page 1098 



2 Male operculate appendage. Operculum shows median cleft 

 and transversal suture. Natural size 



5 Female second sternite. showing genital appendages. Nat- 

 ural size 



6 Large sternite. showing transversal suture. Natural size 



