416 NEW YORK STATE MUSEUM 
Pterygotus ? (Eusarcus) nasutus nov, 
See text figures 102, 103 
A number of carapaces from Catskill fail to show any distinguishing 
features from Pterygotus? (Eusarcus) nasutus (de- 
scribed on p. 382) from the Schenectady beds at Schenectady, and we there- 
fore refer them to that species, although the considerable difference in 
age between the forms makes it some- 
what improbable that they are con- 
specific. The sculpture is well shown in 
several specimens and consists of flat 
closely arranged rather large nodes or tu- 
bercles,asinEusarcus linguatus. 
Fig. ro2, 103 Pterygotus ? (Eusarcus) 
nasutus nov. Two carapaces showing the A like sculpture is shown in some of the 
characteristic angular front and the position 
of the eyes. Fig. 102 x 2: fig. 103 x 1.5 
specimens from the Schenectady shale. 
In the first description the species is assigned to Pterygotus, but the 
closely related species from these Normanskill shales, Eusarcus 
linguatus, indicates that it may more likely be an Eusarcus. 
Pterygotus normanskillensis nov. 
See text figure 104 
This name is proposed for carapaces of distinctly pterygotoid aspect. 
Carapace broadly subrectangular, three fourths as long as wide; 
lateral margins subparallel, slightly convex, antelateral angle distinct, 
abruptly rounded; anterior margin broadly and evenly convex. Basal 
margin slightly concave in middle, postlateral angles 
approximately rectangular. Lateral eyes marginal, situ- 
ated in the antelateral corners, elliptic, small, less than 
one fourth the length of the carapace. Surface sculpture 
not seen. Measurements of type specimen, length, 11 Fiz. 104 Pte rygotus 
normanskillensis 
nov. Holotype. x 1. 
mm, width, 15 mm. The parallel ines indicate 
the cleavage lines appear- 
The presence of a genus of ‘the Pterygotus group ins in the carbonaceous 
