106 



Arabian Sea, off the Travancore coast, 430 and 457-589 fathoms. 



-r, , KT 2108-2115 3853 



Kegd. Nos. — Yo — : 



10 



60. Heterocarpus alphonsi, Spence Bate. 



Heterocarpus alphonsi, Spence Bate, Challenger Crust. Macrura, p. 632, pi. cxii. fig. 1 : Wood-Mason, Ann. Mag. 

 Nat. Hist. (6) VII. 1891, p. 196. 



Rostrum, in the adult, about l\ times the length of the carapace proper, 

 continued nearly to the posterior border of the carapace as a low coarse, but 

 very distinct, carina, on the gastric portion of which are 2 teeth : it is armed 

 along all its ventral extent with from 10 to 13 teeth, and dor sally with 7 or 8, 

 not including the two on the carina. In the young the rostrum is more than 

 twice the length of the carapace proper. 



The carina? of the carapace correspond with those of E. gibbosus, but the 

 " post-antennal," like the " post-ocular " is continued to its posterior border. 



The branchiostegal tooth projects beyond the 2nd joint of the antennal 

 peduncle. 



The 3rd, 4th, and 5th abdominal terga are sharply carinated, the carina in 

 each case being produced posteriorly into a long and sharp spine. 



The antennular peduncle does not reach quite halfway along the antennal 

 scale, but otherwise is as in H. gibbosus : the flagella are not quite as long as the 

 combined carapace and rostrum. 



The antennal scale is nearly two-thirds the length of the carapace proper, 

 and is at least 3 times as long as broad. 



Though the legs and external maxillipeds have the same details of structure, 

 and inter se the same proportions, as in E. gibbosus, they are much slenderer and 

 much shorter, none of them— excepting only the longer one of the 2nd pair of 



l eo .g reaching beyond the antennal scale : moreover the external maxillipeds 



are very little longer than the 1st pair of legs. 



Colour in life deep pink. 



In the largest egg-laden female the rostrum is 54 millim. long, the carapace 

 31 millim., and the abdomen 77 millim. In the largest male the rostrum is 44 

 millim., the carapace 27 millim., and the abdomen 66 millim. 



Arabian Sea, near the Laccadives and in the Gulf of Manar, in 480, 595- 

 556, 675, 696, 636 and 740 fathoms; Bay of Bengal, 753 and 561 fathoms; and 

 Andaman Sea, 490 and 500 fathoms. 



The specimens taken in 561 fathoms were brought on board alive, and 

 poured out, apparently from the orifice of the green-gland, abundant clouds of a 

 highly luminous substance of a pale-blue colour. 



„ , AT 8520 42 3167 6029-6037 6277 6778-6785 923g-92 43 , 3392 3848-3849 



Kegd. JNos. — : -f : — = — § — : — = — — : r * 10 ■ 10 ' 



