284 Carcinological Fauna of India. 



Differs from Cryptopodia in the 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 sharply 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 two pairs of legs has 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-Edwards, Hist. Nat. Crust., I. 370. 



Oethra, A. Milne-Edwards, Miss. Sci. Mex., Crust., I. p. 170 (v. synon.). 



Oethra, Miers, Journ. Linn. Soc, Zool., Vol. XIV. 1879, p. 669. 



The carapace is regularly oval (transversely), with its surface 

 atrongly rugose, and its antero-lateral edges somewhat upturned. The 



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