1895.] A. Alcock— Carcinological Fauna of India. 261 
Carapace almost oval transversely, and with the surface granular 
or pustular. (In the young, besides tubercles, there are some coarse 
spinules in five series — a median, a.nd two oblique lateral on either 
side.) The lateral borders are spinulate or crenulate anteriorly, spinate 
posteriorly, smooth quite posteriorly at the junction with the posterior 
border: the posterior border, except for a hook-like spinule at either 
end, and two spinules in the middle line, is smooth: there are often one 
or two curved spines on the branchial region : the pterygostomian region 
is quite smooth, but on the inferior branchial region are a few coarse 
spinules, most distinct at the bases of the legs* 
The rostrum, which is symmetrically trilobed, is very small, its 
length being less than one-twelfth that of the rest of the carapace. 
The chelipeds, which are massive, are about four times the length 
of the carapace in the male, about 3| times in the female : the mero¬ 
podite is prismatic, or, in transverse section, rhomboidal; its anterior 
and posterior edges are armed with numerous, somewhat curved, spines 
—alternating larger and smaller; its upper edge, as sometimes either 
upper surface, has a row of spinules ; its lower edge is rounded, and has 
a discontinuous series of spinules ; its under surfaces are smooth and 
polished: the carpus has 3 or 4 sharp thin teeth on its outer margin: the 
trigonal palm has twelve or more sharp thin laciniated teeth on its 
outer edge — alternately larger and smaller; along its inner edge is a 
long series of multicuspid spines ; its under edge is finely beaded, and 
its under surfaces are almost smooth; its upper surface has numerous 
irregularly disposed spinules and granules: the dactylus has numerous 
spinules on the outer surface of its broad base. 
The ambulatory legs have the merus compressed and spinulate as 
to its edges, especially the posterior (inferior) edge : the longest of the 
ambulatory legs is hardly longer than the meropodite of the chelipeds. 
Colours in life, pale lilac dorsally, white ventrally. 
In the Museum collection are numerous specimens from the Madras 
coast, from Arrakan and Mergui, and from the Andamans. 
Sub-genus Platylambrus, Stimpson. 
Platylambrus and Enoplolambrus, A. Milne-Edwards, Miss. Sci. Mex., Crust., 
I. pp. 146 and 147. 
Lambrus, Miers, ‘ Challenger* Brachyura, p. 92 (part). 
Carapace carinated or tuberculated, broader than long, broadly 
triangular with rounded sides and a broad but acute and projecting 
rostrum : no post-ocular constriction : chelipeds with the meropodite 
dan palm straight, the former joint prismatic, the latter sharply tri- 
