1895.] 
A. Alcock —Card nolog ical Fauna of India. 
259 
3. Carapace transversely oval; expanded laterally, 
but not posteriorly : no ridge on the ptery- 
gostomian region. CEthra. 
Lambrus, Leach. 
Lambrus, Leach, Trans. Linn. Soc., Yol. XI. 1815, pp. 308, 310. 
Lambrus, Milne-Edwards, Hist. Nat. Crust., I. 352. 
Lambrus, A. Milne-Edwards, Miss. Sci. Mex., Crust., I. p. 146. 
Lambrus, Miers, J. L. S., Zool., Yol. XIY. 1879, p. 668 j and ‘ Challenger ’ Brachy- 
ura, p. 91. 
Carapace either broadly triangular with rounded sides and pointed 
front, or ovate-pentagonal with front pointed but extremely short: the 
surface is granular, or tubercular, or spiny. 
The eyes are enclosed in distinct orbits, which have a suture above 
and a hiatus below, the hiatus being occupied by the second joint (true 
third joint) of the antennal peduncle. 
The antennules fold obliquely. The antennae are small: their basal 
joint, which is extremely short, and does not reach the front, is wedged 
in between the antennulary fossa and the large lobe that constitutes the 
floor of the orbit. 
The buccal frame is usually quadrangular, but is sometimes a little 
narrowed in front; it is completely closed by the external maxillipeds: 
the epistome is sometimes very large, sometimes narrow. 
The chelipeds are usually of immense size and length, out of all 
proportion to the short slender ambulatory legs : the meropodite and 
“ hand ” are usually prismatic, with the borders strongly dentate : the 
fingers are much shorter than the palm, and are abruptly curved in¬ 
wards and a little downwards. 
The abdomen of the female usually consists of seven segments ; that 
of the male of five or six. 
Professor A. Milne-Edwards, (Miss. Sci. Mex., Crust., I. pp. 146— 
148) subdivides the genus Lambrus into ten sub-genera, the indepen¬ 
dence of all of which, however, is not universally admitted. 
The sub-genera at present known to exist in Indian waters are 
shown in the following 
Key to the Indian sub-genera of the genus Lambrus. 
I. Carapace tuberculate, ovate-pentagonal, the rostrum not 
breaking beyond the general outline of the body : the 
buccal frame a little narrowed in front.,,. Lambrus. 
J. ii. 33 
