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



6-costat,e, the four upper costse granular ; only two spines — and tliose 

 small— on the upper surface of the hand. Fingers longer than the 

 palm in the smaller cheliped, as long as the palm in the larger 

 cheliped. 



The merus of the last pair of legs is nearly as broad as long and 

 has the usual spine on its posterior border; the posterior border of the 

 propodite is smooth. 



The 6th tergum of the male abdomen is broader than long and has 

 curved and gradually convergent sides. 



In the Indian Museum are 98 specimens, chiefly from the northern 

 parts of the Bay of Bengal, Mergni, and the Gulf of Martaban, but 

 also from off the Andamans and off Ceylon. 



36. Charyhdis (Ooniosoma) variegata (De Haan). 



? Portunus variegatus, Fabricins, Ent. Syst. Snppl. p. 364. 



.'' ? ? Cancer callianassa, Herbst. III. ii. 45, pi. ]iv. fig. 7. 



? Thalamita callianassa, Milne Edwards, Hist. Nat. Crnst. I. 464. 



Charyhdis variegatus, De Haan, Faun. Japon. Crast. pi. i. fig. 2 : Stimpson, Proc. 

 Ac. Nat. Sci. Philad. 1858, p. 39. 



Goniosoma callianassa, A. Milne Edwards, Archiv. da Mus. X. 1861, pp. 382, 385 

 (part). 



Goniosoma variegatum, var. callianassa, J. K. Henderson, Trans. Linn. Soc, 

 Zool., (2) V. 1893, p. 377. 



A small species : the carapace in the adult about 20 millim. long 

 and about 35 millim. in extreme breadth. 



Carapace about four-sevenths as long as broad (or about two-thirds 

 as long as broad without the enlarged lateral spines), slightly convex, 

 the regions for a Goniosoma well defined, crossed transversely by 

 numerous salient granular ridges arranged as in G. natator — the ridges 

 standing out from the copious short pile with which the carapace is 

 covered. 



Front cut into 6 rather pointed teeth {not including the inner 

 supra-orbital angles) of which the middle two are the most prominent 

 and the outer one on either side is the least prominent and much the 

 slenderest. 



An tero- lateral borders cut into six teeth (including the outer 

 orbital angle) which gradually increase in size from before backwards, 

 the last being a salient spine about twice as long as the last but one — 

 Neptunus like. 



The posterior border of the dorsal surface of the carapace forms a 

 curve with the postero-lateral borders. 



Eyes large : the orbit, which has a strong dorsal inclination, is about 

 two-fifths the width of the interorbital space ; the inner angle of its 



