2 A REVISION OF THE ASTACID. 
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vs 
one third as long as the anterior part of the carapace). Areola broad. Ster- 
num covered with a dense growth of coarse setee. Abdomen longer than the 
cephalothorax. Proximal segment of telson armed on each side with four 
spines. Anterior process of epistoma broad triangular with ciliated margin. 
Basal segment of antennule with a sharp spine below, near the inner margin 
of the middle of its length. Antennz shorter than the body. Second and 
third segments with acute external spine ; scale a little longer than peduncle 
of antenne and rostrum, moderately broad, broadest below the middle. 
Third maxillipeds hairy within and below. Chela moderately broad, cov- 
ered with inconspicuous ciliate squamous tubercles, internal margin nearly 
straight. Fingers as long as the hand, densely ciliated. Carpus tubercu- 
late, a prominent spine within, and one near each point of articulation with 
the chela. Meros smooth outside and inside, tuberculate and spinous above, 
biserially spinous and ciliate beneath. Third and fourth pairs of legs toothed 
on the third segment. Fifth pair of legs with a hook on the basal segment. 
Anterior abdominal appendages of moderate length, articulated at the base, 
internal part with an articulated spine obliquely placed, external part termi- 
nating in a rounded head with two short, blunt teeth. 
Female. — Differs from the male in its shorter and smaller claws. The 
sternum is densely ciliated, as in the male. The annulus ventralis conical 
with sigmoid longitudinal fissure ; movable. ‘ 
Length, 54 mm, Carapace, 26 mm. Abdomen, 29mm. Distance from 
tip of rostrum to cervical groove, 19 mm.; from cervical groove to poste- 
rior border of carapace, 7 mm. Width of areola, 3mm. Length of chela, 
15.5 mm.; breadth, 4mm. (In the female, which is 59 mm. long, the chela 
is 12 mm. long by 4 mm. wide.) 
Two specimens, one male of the second form and one female, in the 
U. S. National Museum (No. 3181), collected by A. Graves in McBean 
Creek, a tributary of the Savannah River a little south of Augusta, Georgia, 
are the types of this species. There are two young female specimens from 
the same region, Richmond Co., in the Museum of Comparative Zodlogy. 
Differs from C. Lecontei and C. angustatus by its broader areola, subplane 
rostrum, and the pubescence of rostrum and cervical groove. The male 
appendages also differ, as shown in the description and figures. 
