414 NEW YORK STATE MUSEUM 
fourth the width and one eighth the length of the carapace; basal margin 
slightly concave, the postlateral angles subrectangular. Eyes marginal, 
circular, small, a little longer than one fifth the length of the carapace, 
e % situated in an angle between the lateral 
margins and the base of the frontal process. 
Surface densely covered with relatively large 
flat nodes. The type measures 9.4 mm in 
length and 10.5 mm in width. 
This species strongly suggests the 
Fig. 96, 07, Eusarcus linguatus nv. Huyusarcus vaningeni, with which 
Mies iter gk ae Rosas epacimay some- 
what distorted. ig. 97 Cotype. xX 1.5. x : : 
Younger individual showing traces of the it has not only the peculiar anterior snout 
en ture, mG frontal process and the 
ocellar moun 
in common, but also the general outline and 
the position of the eyes. It is also closely related to the species here 
described from the Normanskill and Schenectady shalesas Pterygotus ? 
(Eusarcus) nasutus, which possesses a less prominent anterior 
process and more distant eyes but is very similar to this species in out- 
line and surface ornamentation. 
We also refer to this species a number of specimens which correspond 
to the above description in all particulars but lack the anterior process 
and assume that the latter may either be broken off or be folded under 
normally like the epistoma of Pterygotus; with present material we have 
no means of deciding which. 
Dolichopterus breviceps nov. 
See text figure 98 
A small carapace differs from the others in the position 
of its lateral eyes which are submarginal in the antelateral 
angles, thereby suggesting the presence of a species of Doli- er ee 
1g. 9 Oui = 
chopterus. The carapace is rather short subquadrangular, its ¢" oviceps 
nov. olotype. 
length to its width as 5:7; the lateral margins slightly x: 
concave, diverging forward at a small angle, the frontal margin broadly 
