Carcinological Fmina of India. 333 



Nat., Zool., (3) XX. 1853, p. 221 : Stimpson, Proc. Ac. Nat. Sci, Philad. 1858, p. 107 : 

 Slaiter, Tijds. Nederl. Ind. XL. 1881, p. 162: J. R. Henderson, Trans. Liun. Soc, 

 Zool., (2) V. 1893, p. 394. 



This species is included in the Indian Fanna on the authority of 

 Pi'ofessor J. R. Henderson. It seems to be characterized by having tlie 

 ischium and raerus of the external maxillipeds deeply grooved, longi- 

 tudinally, near the outer margin ; the legs stout and hairy, the third 

 pair barely twice as long as the carapace ; and the three terminal joints 

 of the first pair of legs broadened so that their edges are almost 

 carinate: the lateral borders of the carap.-ice are granular or finely 

 denticulate. 



34. Xenophthahnns ohsctirus, Henderson. 



Xenophthalmus ohscurus, J. R. Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, 

 p. 394, pi. xxxvi. figs. 18, 19. 



Carapace glabrous and shiny, but its surface is somewhat creased : 

 the median regions are separated from the branchinl regions by grooves 

 or depressions, nnd each branchial region is traversed obliquely in its 

 posterior part by a low ridge. 



The rounded-off antero-lateral corners of the carapace are traveised 

 by three low fine ridges, nearly parallel with one another : one of these 

 defines the pterygostomian region, the next appears to be the true 

 antero-lateral border, while the most dorsal one runs from the angle of 

 the orbit to the junction of tlie antero-lateral and postero-lateral 

 borders. 



Front narrow, nearly vertically deflexed, longitudinally grooved in 

 the middle line, its free edge square-cut but faintly sinuous. The eyes 

 are just visible as minute linear specks, placed posteriorly. 



No epistome. The ischium and merus of the external maxillipeds 

 are not deeply grooved near the outer border. 



Chelipeds in the female shorter and much slenderer than the first 

 and last pair of legs. 



The 3rd pair of legs are the longest, being about 2f times the 

 length of the cai-apace : the second pair, though a little shorter than the 

 3rd, a.re equally stout. The first and last pairs are about equal to one 

 another in size (in the female) being hardly longer tlian the carapace, 

 and slenderer than the other legs. The terminal joints of all the legs 

 are hairy : the posterior boi'ders of the meropodites of the first three 

 pairs are .<«piny, the anterior border being very finely .serrulate. 



In the Indian Museum are two females, one, with eggs, from off the 

 G an jam coast, 20 fathoms, the other from the Andaraans. The carapace 

 in the larger female is 6 millim. long and 8 millim. in greatest breath. 



676 



