94 A. Alcock — Carcinological Fauna of India. [No. 1, 



Postero-lateral borders not at all strongly convergent, the spine at 

 their anterior end sharply carinate. Posterior border straight, its length 

 is half the greatest width of the carapace (spines included). 



Eyes, with the eye-stalks, well over half the greatest breadth of the 

 carapace (spines included). 



The maxillipeds in repose almost close the mouth, a narrow space 

 being left between them : the antero-external angle of the merus pro- 

 duced and lobe-like. Epistome almost linear. 



Clielipeds in the male nearly three times the greatest length of 

 the carapace : anterior border of arm with a row of spines the distal 2 

 of which are enlarged, posterior border with 2 enlarged spines in its 

 distal half: inner angle of wrist strongly spiniform, a spine followed 

 by a carina along the outer surface of wrist: hand very sharply 

 carinated on the upper and outer surfaces, armed with 2 spines — one 

 in front of the apex of the wrist-joinfc, the other behind the finger- 

 joint: dactylus very little shorter than the palm. 



First 3 pair of legs slender : a short spine on the posterior border 

 of the merus of the 4th pair. 



2nd and 3rd abdominal terga carinate in both sexes : 6th tergum 

 in the male much broader than long, with converging sides. 



Colours in spirit yellowish ; the edges of the carapace, the crests 

 and spines of the chelipeds, and the carinse of the abdomen have much 

 the same nacreous sheen as in Neptunus argentatus. 



In the Indian Museum are 3 specimens from the Andamans, and 

 one from the Gulf of Martaban 53 f ras. The carapace of the largest 

 specimen is 12 millim. long and 23 millim. broad. 



This species in several respects approaches 'Euphylax. It differs 

 from Podophthalums vigil in the following particulars : — 



(1) the carapace is almost oblong-quadrate, its antero-lateral 

 borders are curved or angularly bent, its surface is granular and its 

 regions better defined : 



(2) the buccal cavern is squarer and is more nearly closed by the 

 external maxillipeds, the antero-external angle of the merus of which is 

 produced to form a lobule : the epistome is linear : 



(3) the front is horizontal and bilobed : 



(4) the lateral epibranchial spine is much shorter: 



(5) the hand is very sharply carinated and the fingers are nearly 

 as long as the palm. 



Family CANCRID^. 



Canceriens arquSs {Pseudocarcinus and Pirimela only) Milne Edwards Hist. Nat. 

 Crust. I. 371 : and Corystiens{p&ri) Milne Edwards, op. cit. II. 139. 



