105 



largest male the rostrum is 27 millim., the carapace 34 - 5 millim., and the abdo- 

 men 70 millim. 



The species is fairly common : it has been taken in the Andaman Sea, in 

 185, 188-220, 194 and 198 fathoms, in the Bay of Bengal, off the Madras coast, 

 in 145-250 and 240 fathoms, and in the Arabian Sea, off the Travancore coast, 

 in 224-284 fathoms. 



-n i at 8575 502 4255-4260 6787-0795 6797 1408-1409 2116-2119 2510 2512-2513 



Regd. Nos. — : T : — — : — r - : — : — f — : —— : -^ : — - : 



3388-3391 



10 



59. Heterocarpus Icevigatus, Spence Bate. 



Heterocarpus Ixvigatus, Spence Bate, Challenger Crustacea Macrura, p. 636, pi. cxii. fig. 3 : Anderson, Ann. 

 Mag. Nat. Hist. (7) III. 1899, p. 285. 



Illustrations of the Zoology of the Investigator, Crustacea, Plate XLII. Figs. 1, la. 



Closely resembles E. gibbosus from which it differs only in the following 

 characters : — 



The rostrum, in the adult, is as long as the carapace proper : it is multi- 

 serrate ventrally as in H. gibbosus, but dorsally there is a single tooth just in 

 front of the eye, beyond which it is quite smooth : its posterior prolongation, 

 or crest, is not so high, and is not more than 5-serrate. 



The carinse of the carapace are as in E. gibbosus, but the 1st, or "post- 

 ocular," is straighter, and the 3rd, or " post-antennal," is continued further back. 

 Moreover, below the latter, near the postero-lateral angle of the carapace, is an 

 additional short oblique carina. 



The branchiostegal spine is broad and trenchant: its point projects far 

 beyond the orbital spine, and beyond the base of the antennal scale. 



The 3rd abdominal somite is bluntly carinated as in H. gibbosus, but its 

 posterior border is strongly convex, though not acutely produced. 



The sharp antennular scale projects beyond the 2nd joint of the antennular 

 peduncle. 



The antennal scale is more than half the length of the carapace, and its 

 greatest breadth is about a third of its length. 



The 3rd pair of legs are slightly longer than the 4th and 5th pairs ; but 

 with this exception, and excepting also that they are all slightly shorter, the 

 legs and external maxillipeds have inter se the same relative proportions as in 

 H. gibbosus, and the same details of structure. 



In the largest egg-laden female the rostrum is 42 millim. long, the carapace 

 44 millim., and the abdomen 79 millim. In the largest male the rostrum is 55 

 millim., the carapace 44 millim., and the abdomen 82 millim. 

 14 



