420 NEW YORK STATE MUSEUM 
a very long Upper Siluric time interval, of which a late stage only is repre- 
sented by the thinner northern extension into the Shawangunk mountains. 
Here again, as in the fauna of the Normanskill and Schenectady beds, 
the eurypterids may have changed but very little through several geologic 
periods; and in all these cases cited, the Shawangunk grit, the Schenectady 
beds and the Normanskill beds at Kingston, there is identity in lithologic 
characters and indications of similar littoral conditions, of narrow gulf, 
or delta, or estuary. 
AN ADDITIONAL SPECIES OF EUSARCUS FROM THE BASE OF THE 
SALINA FORMATION 
After decades of industrious collecting of eurypterids from the New 
York Siluric waterlimes, the rich stores of these remains have not been 
exhausted. While this work was in press and partly in pages, Professor 
Gilbert van Ingen of Princeton University sent us some slabs from a loose 
concretion in Oriskany creek in Oneida county, N. Y., which carry three 
carapaces and other parts of an Eusarcus of very unexpected and peculiar 
character. 
Eusarcus vaningeni nov. 
See text figures 108-15 
Description. The outline of the body is asin E. scorpionis. 
Cephalothorax. The carapace is broadly subtriangular, about one 
third wider than long (not counting a frontal snoutlike prolongation), 
the two lateral margins converging at an angle of about 70° toward the 
anterior end which is produced into a linguiform process, about one fifth 
the length of the carapace. The base is to the lateral margin (excluding 
the snout) as 4:3. The posterior margin is distinctly bent forward in 
the middle and the postlateral angles are markedly truncate. The lateral 
margins are slightly concave in the posterior and as gently convex in the 
anterior half. The anterior process is one fourth as wide at its base as the 
basal margin of the carapace... Its lateral margins are nearly straight and 
converge slightly; the anterior margin 1s gently convex. The lateral and 
