94. BULLETIN OF THE 
The body is more than three times as long as broad, with the sides nearly 
straight and parallel, smooth and polished, with fewer punctations than in C. 
polita, but with the usual median dorsal row. 
Head rounded hexagonal, broadest across the eyes, with an impressed line 
just above them extending around the front of the head. Eyes small, subtri- 
angular, notched on their front outline by a thickened marginal ridge, which 
dies out in the ocular region, Antennule (PI. I. Fig. 3a) about as long as the 
peduncle of the antenne; two basal segments swollen and together longer 
than the third; flagellum as long as the peduncle, composed of about a dozen 
segments, shorter and more closely articulated than in C@. polita. (Pl. IL 
Fig. 3b). Antenne surpassing the margin of the first segment, shorter than 
in the preceding species ; flagellum one half longer than the peduncle and 
composed of about twenty-two segments. 
First thoracic segment closely adapted to the hinder margin of the head, 
about twice as long on the median line as the second. Behind the second, 
the segments gradually increase in length to the seventh, while in C. polita the 
fifth is the longest segment and the seventh is shorter than the sixth. The 
first segment is marked in the epimeral region by a nearly marginal impressed 
line. In the following segments the epimera are distinct and increase in size 
to the last. The second and third epimera are subquadrate, with rounded 
posterior angles, much as in C. polita, but each is marked by a curved im- 
pressed line below and somewhat behind the middle. The third and fourth 
epimera are also quadrate in outline, the posterior margins becoming oblique 
and meeting the inferior margin in each at an angle, while in C. polita both 
these epimera are rounded behind. In the present species, moreover, both 
these epimera are marked with an oblique impressed line running from near 
the middle of the upper margin toward the lower posterior angle. The last 
two epimera are subtriangular in outline, as in C. polita, and the sixth is 
marked with an impressed line, much as in the fourth and fifth. A similar 
line is faint, or represented by a row of punctations, on the last epimeron. 
The impressed lines on the epimera of this species serve also to distinguish it 
from 0. concharum (Stimp.), to which it has considerable resemblance. 
In the first pair of legs (Pl. II. Fig. 3a) the merus is large and produced at 
its outer angle beyond the middle of the propodus, its palmar margin is armed 
with acute spinules much as in C. polita, but not quite as strong as in that 
species (Pl. II. Fig. 2 a), while it differs from OC. concharwm (Pl. Il. Fig. 4a) 
in lacking the row of blunt spinules near the palmar margin of this segment. 
The legs of the fourth pair (PL IL. Fig. 3b) are armed with spines, with 
comparatively few bristles among them, and the spines upon the surface of the 
merus and carpus are arranged transversely, instead of as in the last species. 
In the seventh pair of legs (Pl. II. Fig. 3c) the basis is slender and nearly 
naked, as in C. concharum (PI. II. Fig. 4c), and the three following segments 
are flattened and furnished with close-set bristles distally. 
The pleon (Pl. I. Fig. 8c) is more overlapped and concealed by the last 
thoracic segment than in either C. concharwm (Pl. I. Fig. 4) or C. polita (Pl. I. 
