284 
[No. 2, 
A. Alcock— Carcinological Fauna of India. 
Differs from Cryptopodia in tlie following characters :— 
The posterior border of the carapace slightly overlaps the abdo¬ 
men, but is not distinctly produced ; the lateral clypeiform expansions 
are also less produced, so that the legs when even moderately extended 
can be seen beyond them. 
The pterygostomian and sub-hepatic regions are traversed by a 
granular ridge which runs parallel to the antero-lateral border from 
the angle of the buccal cavity to the base of the chelipeds. 
Heterocrypta investigatoris , n. sp. 
Carapace broadly pentagonal; the posterior border almost straight, 
and crenulated ; the other borders sharply dentate. The central de¬ 
pression of the carapace is semi-circular and very deep, with the 
boundary raised into a carina: the horns of the semi-circle end each 
in a boss or mammillary tubercle, from which a carina runs backwards 
to the posterior angle of the carapace. The rostrum is very large and 
prominent, shaped like a leaf : its surface is smooth : that of the cara¬ 
pace is either smooth or granular — the granules, when present, being 
most abundant on the posterior part of the branchial regions. 
The chelipeds, which are twice the length of the carapace, have 
both the inner and outer edges of the arm sharply dentate (but not 
alate as in Cryptopodia ), and the lower edge beaded : the carpus is sub- 
globular : the hand has both the inner and the outer edges bluntly 
dentate, and the under surface closely covered with bead-like granules. 
The ambulatory legs have the upper edges of the 3rd, 4th, and 5th 
joints sliarply carinate : the meropodite also, in the case of the first two 
pairs of legs, has a single row of teeth or spines along its lower edge, 
and in the case of the last tw T o pairs of legs lias a double row of spines 
along the lower edge. 
Like all the species of this genus, this species is small, the breadth 
of the carapace in the largest specimen being 18 millim. 
It is not uncommon off rocky parts of the coasts of India up to 
and about 30 fathoms. It would seem to be allied to the Cryptopodia 
contractu of Stimpson (Proc. Ac. Nat. Sci., Philad., 1857, p. 220),.. 
Oethra, Leach. 
Oethra , Leach. 
Oethra, Milne-Edwarcls, Hist. Nat. Crust., I. 370. 
Oethra, A. Milne-Edwards, Miss. Sci. Mex., Crust., I. p 170 (r. synon.). 
Oethra, Miers, Journ. Linn. Soc., Zool., Yol. XIY. 1879, p. 669. 
The carapace is regularly oval (transversely), with its surface 
strongly rugose, and its antero-lateral edges somewhat upturned. The 
