268 
A. Alcock —Carcinological Fauna of India. 
[No. 2, 
being smooth and hare—except for a pimple at each of the fonr angles 
of the cardiac region. On either branchial region, above the postero¬ 
lateral angle of the carapace, is a bluntly conical spine. The rostrum 
is very broad, and is concave and bluntly pointed: on either side above 
the eye is a little eminence which carries a tuft of long silky hairs. The 
post-ocular constriction is distinct, as is also the post-hepatic. The 
antero-lateral (including the hepatic) margin is faintly crenulated : the 
posterior border is quite smooth. 
The chelipeds in the male are three times the length of the cara¬ 
pace, but not more than times in the female: the anterior (or inner) 
margin of the arm and hand is evenly and bluntly dentate, or crenulate ; 
the posterior (or outer) margin in the same joints is as evenly but much 
more bluntly and indistinctly dentate, and the lower margin faintly 
beaded: the carpus is either quite smooth or has a few nodules. 
The ambulatory legs are smooth, rather stout, and are longer than 
the hand. In the male near the anterior border of the 6th abdominal 
tergum is a strong spine. This is a fairly common species at the 
Andamans. 
Lambrus (Rhinolamhrus) gracilis, Dana. 
Lambrus gracilis, Dana U. S. Expl. Exp. Crust., pt. I. p. 137, pi. vi. figs. 6 a-b. 
Lambrus gracilis, Miers, ‘ Challenger ’ Brachyura, p. 94. 
Lambrus deflexifrons, Alcock and Anderson (neo Miers), J. A. S. B., 1894, pt. ii. 
p. 199. 
Carapace, with rostrum, considerably longer than broad; with a 
pronounced post-ocular constriction; somewhat rhomboidal in shape: 
the regions are extremely prominent, especially the cardiac, which is 
capped by a conical tooth, and the branchial, which rises into an oblique 
crest terminating posteriorly in a tooth : the hepatic region forms a 
prominent tooth, behind which the rounded lateral margins are 6 or 7 
toothed: there are two laminar teeth on the posterior border: other¬ 
wise the carapace is smooth. The rostrum is broad, deflexed, and dis¬ 
tinctly trilobed towards the tip. 
The chelipeds are not quite twice the length of the carapace and 
rostrum; and in the adult are not symmetrical — one, either right or 
left, having the hand much larger than the other. In the young the 
asymmetry is hardly noticeable. The arm has the anterior (inner) and 
posterior (outer) border irregularly armed with compressed blunt 
spines, of which the one at the far end of the outer border is the largest 
— being almost foliaceous : the hand has its inner and outer borders 
armed in the same irregular way, two or three of the teeth on the outer 
border, and one on the inner border being enlarged: the under surfaces 
