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. Antennulse (PL I. Fig. 3 a) about as long as the 

 peduncle of the antennae ; two basal segments swollen and together longer 

 tban the third; flagellum as long as the peduncle, composed of about a dozen 

 segments, shorter and more closely articulated than in C. polita. (PI. I. 

 Fig. 3 b). Antennae 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 oblic^ue inqjressed 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 disthiguish it 

 from C concharum (Stimp.), to which it has considerable resemblance. 



In the first pair of legs (PI. II. Fig. 3 a) 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 G. polita, but not quite as strong as in that 

 species (PI. II. Fig. 2 a), while it difl'ers from C. concharum (PI. II. Fig. 4 a) 

 in lacking the row of blunt spinules near the palmar margin of this segment. 

 The legs of the fourth pair (PI. II. Fig. 3b) are araied with spines, with 

 comparatively few bristles among them, and the spines upon the surface of the 

 merus abd carpus are arrangetl transversely, instead of as in the last species. 

 In the seventh pair of legs (PI. II. Fig. 3 c) the basis is slender and nearly 

 naked, as in C. concharum (PI. II. Fig. 4 c), and the three following segments 

 are flattened and furnished with close-set bristles distally. 



The pleon (PI. I. Fig. 3 c) is more overlapped and concealed by the last 

 thoracic segment than in either C. concharum (PI. I. Fig. 4) or C. polita (PI. I. 



