94 S. I. Smith — Crustaceans of the Atlantic Coast. 
margin projects in an obtuse and rounded angle between the eyes, 
and, beneath the eye each side, the lateral margin projects into an 
acute and spiniform angle, just above which there is a deep sinus in 
the margin for the reception of the base of the antenna. The trans- 
verse sulcus is well-marked, strongly arcuate, and terminates each 
side just above the antero-lateral spine. The lateral margin is bent 
strongly upward in an obtuse angle at a point about a third of its 
length from the anterior margin. The posterior margin is only 
slightly emarginate. The eyes are very large, their greater diame- 
ter being more than a third of the breadth of the carapax, remote 
from each other, and attached by very slender bases; they are very 
nearly globular, though slightlv flattened above, and the black, 
faceted area, occupying the greater portion of the surface, terminates 
in a regular and slightly arcuate line above. The peduncles of the 
antennulae are only a little longer than the eyes, and the distal seg- 
ment in each is as long as the two proximal, of which the second one 
is very short, not half as long as the first and much shorter upon the 
outer than upon the inner side. The flagella are stout and the outer 
longer than inner, as usual. In the adult male the segments of the 
peduncle are stouter than in the female, the basal and terminal seg- 
ments each being as broad as long, and the distal segment termin- 
ates, beneath the base of the inner flagellum, in an obtuse, conical, 
and densely hirsute or ciliated process similar to that in the males of 
Erythrops and Parerythrops. The squamiform appendage of 
antenna (Plate XII, figure 2), is only about three times as long as 
broad, the greatest breadth being toward the distal extremity; the 
outer margin is nearly straight from near the base and terminates in 
a very large dentiform spine. From the base of this spine the ante- 
rior margin is very oblique, only slightly arcuate, scarcely longer 
than the breadth of the scale itself, and terminates in an oval tip 
which is about a third of the width of the scale in front of the tip of 
the lateral spine. The inner and terminal margins together are fur- 
nished with nearly fifty set*, of which about a third are on the term- 
inal margin. The peduncle of the antennula does not reach to the 
middle of the squamiform appendage, and the three distal segments 
are very short, the ultimate and antepenultimate each being about as 
broad as long and the two nearly equal in length, while the penulti- 
mate is shorter than either. The flagellum is stout and probably 
nearly as long as the rest of the animal, though, in all the specimens 
examined, the terminal portion is wanting. 
The mandibles agree very closely, except in some of the details of 
