C. D. Walcott—New Genus of the Eurypterida. 2138 
Art. X1X.—Deseription of a New Genus of the Order Hurypte- 
rida from the Utica Slate; by C. D. Waxcorv. 
In the February number of this Journal,* notice was given 
of the discovery of the fragmentary remains of a large Poecilo- 
pod in the Utica slate and its identification with the Hurypte- 
rida, a provisional reference being made to the genus Hurypterus. 
A review of this and the genera of its order shows that none 
of them present the characters seen in the remarkable cephalic 
appendage from which the genus now proposed derives its name. 
Echinognathus, nv. g. 
in the genus Pterygotus. Type, EB. Olevelandi. 
Echinognathus Clevelandi. 
yn. Eurypterus? Clevelandi Walcott. This Journal, vol. xxiii, p. 151, 1882. 
* Vol. xxiii, p. 151, 1882. + Pal. New York, iii, p, 414*, 
