33 



The 3rd abdominal tergum is carinated in its posterior half, and a hooked 

 spine springs from the anterior end of the carina : the 4th tergum is faintly, and 

 the 5th and 6th are very sharply carinated, the carina of the last ending in a 

 spine. The 6th abdominal somite is nearly double the length of the 5th. The 

 telson is not two-thirds the length of the endopodite of the caudal swimmeret, 

 and is armed on either side with 4 tiny spinules. 



Eyes brown, not wider than their stalks: the tubercle of the eyestalk 

 subacute and very prominent. 



The outer antennular flagellum is about as long as the basal joint of the 

 peduncle, the inner is very long. The antennal scale is very large, its length 

 being nearly three-fourths that of the carapace and rostrum. 



The external maxillipeds of the female are about as long as the 1st pair of 

 thoracic legs. The first 3 pairs of legs have the meri compressed and broadened, 

 this being most conspicuous in the 3rd pair, and the propodites not very 

 unequal in length : the fingers in all are about twice the length of the palms. 

 The slender 5th pair of legs reach nearly to the tips of the antennal scales, and 

 the slender 4th pair are not much shorter. 



The exopodites of the 1st pair of abdominal appendages are very lono- 



longer than the first five and a quarter abdominal terga. 



The thelycum is a prominent pentagonal plate, with the anterior an<d e 

 acute, lying between the bases of the 4th pair of thoracic legs. 



Colour in life, transparent orange. 



In the largest female the carapace and rostrum are 32 millim., the abdo- 

 men is 60 millim., measured in the mid-dorsal line. 



Arabian Sea, in the neighbourhood of the Laccadives, 902, 1022, 1091 

 fathoms : Bay of Bengal 1300, 1310 and 1644 fathoms. 



Regd. Nos. «£: 6 -f? (Types of the species): 5 3 2f! : ~2 : «j» 



14. Aristceus (Hemipeneus) crassipes, Wood-Mason. 



Arista us crassipes, Wood-Mason, Ann. Mag. Nat. Hist., Oct. 1891, pp. 281, 282, fig. 7. 



ILIXSTRATIONS OF THE ZOOLOGY OF THE INVESTIGATOR, CRUSTACEA, PLATE XLIX. FlGS. 1, 2. 



Integument covered with a very short, fine, and deciduous pubescence. 



Rostrum in the female much longer than the rest of the carapace, recurved • 

 in the male about a third the length of the rest of the carapace, ascendant 

 nearly straight : its carina is distinct to within a short distance of the posterior 

 border of the carapace. (The rostrum is dorsally 3-toothed as usual). Cervical 

 5 



