276 NEW YORK STATE MUSEUM 
The fourth and fifth segments are well shown, the latter with the 
typical elongate development seen in Dolichopterus. The sixth and 
seventh are pushed so into each other that it is impossible to clearly 
separate them; the eighth is of cup-shaped outline and shorter than the cor- 
responding segment in the genotype, but, as indicated by wrinkles, pro- 
bably much compressed longitudinally. 
Dolichopterus stylonuroides nov. 
| Plate 46, figure 9-14 
A rare and interesting species from Otisville 1s represented in the 
collections by three carapaces and one more complete specimen retain- 
ing besides the carapace one entire swimming leg and three tergites. 
From these specimens the following description is derived. 
Description. Body small, probably slender. Carapace spadelike in 
outline, as long as wide, widest on anterior fourth and contracting by about 
one fourth to posterior margin; frontal margin convex, quite uniformly 
rounded, sometimes slightly produced in the middle; antelateral angles well 
rounded; lateral margins gently concave; posterior margin slightly con- 
cave in the middle. A broad, level rim of approximately uniform width 
surrounds the frontal and lateral margins, while the underside of the carapace 
shows a still wider doublure most expanded in the middle of the front 
where a triangular lobe extends backward; and which also broadens toward 
the posterior margin. The lateral eyes are large (one fourth length of 
carapace), kidney-shaped and situated in the antelateral corners, one 
third the length of the carapace from the frontal margin and half way 
between the median line and the lateral margin. The visual surface is 
crescent-shaped. The ocelli are very distinct, and situated on a circular 
tubercle between the anterior parts of the lateral eyes. A longitudinal 
ridge seems to extend thence backward. | 
Abdomen. ‘The first tergite 1s very short (six times as wide as long), 
closely parallel to the posterior margin of the carapace. The following 
tergites are two to three times as long and slightly increase in width. 
