34 Crustacea and Echinodermata of the 



or exposed surface, their upper sides being pressed against 

 the carapax. The terminal flagellum is very long and slen- 

 der, compressed, of nearly the same width throughout, and 

 consists of about twenty-two articles, each bearing two 

 clavate setse. 



The external maxillipeds are rather broad, and have their 

 outer surfaces flattened, with sharp, projecting, lamellar 

 edges. They resemble those of the Brachyoura much more 

 closely than do those of other members of the tribe,. The 

 last two articles are, however, well developed. The basal 

 article is of great width, expanded exteriorly, and bearing 

 at its antero-internal angle the second, small, with bilobate 

 inner margin ; the third is elongated, and presents a trian- 

 gular face. The surfaces of all these points are covered 

 with the short, clavate hairs so peculiar in this species. 



The feet of the first or anterior pair are very unequal in 

 size, the right hand being much the larger. Their second 

 and iliird joints bear a sharp longitudinal crest inferiorly, 

 against which the margin of the hand rests when retracted ; 

 the second joint also bears a sharp compressed tooth above, 

 near its articulation with the third, which also bears a still 

 larger and more prominent tooth almost continuous with 

 that on the second. The larger hand is broad, convex, with 

 about six tuberculous ridges on the outer surface, and a 

 strong projection above at the articulation of the short, stout 

 linger, which is also ridged, and bears a crest above. The 

 surface of contact between the thumb and finger is broad, 

 with its margin scarcely dentate. The feet of the second, 

 third, and fourth pairs, about equal in size, are strongly 

 compressed, almost lamelliform, and sharply crested above 

 for most of their length. Those of the fifth pair are con- 

 cealed beneath the carapax, (or rather beneath the abdo- 

 men,) and are nearly the same in size and structure as in 

 the other genera of the tribe. We may remark, however, 

 that the three articles forming the terminal portion of these 

 feet are of greater length and more slender than is usual ; — 



