474 Stimpson on the Crustacea and Echinodermata 
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 sete. 
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 
ast 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 third 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 
finger, 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 COP- 
cealed beneath the carapax, (or rather beneath the abdo- 
men,) and are nearly the same in size and structure as 1n 
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 ;— 
