Indian Deep-sea Dredging. 237 



the first five are carinated, the cariiue of the first three cul- 

 minating in procumbent spines, that of the fourth not beinj^ 

 produced and that of the fifth forming a simple cusp ; the 

 sixth tergum has no vestige of a carina, but the telson in its 

 front part has a rctrorsc spine ; a shallow groove traverses 

 the terga obliquely backwards on each side of the carina from 

 the second to the fifth. The abdominal pleurai have the 

 surface smooth and the setose margin smoothly moulded ; all 

 but the sixth have a not very prominent midrib. 



The ophthalmic notches are shallow, with smooth edges, 

 and their peduncles bear each a strong spine at the frontal 

 level. The basal joint of the antennules has a single spine at 

 the antero-external angle ; the antenuulary scale is peculiar 

 in being very much shorter than the antennal scale ; the 

 former is truncated on a level with the rest of the joint, the 

 latter has the usual form and ends in a spine. 



All five pairs of thoracic legs are chelate. The great 

 chelipeds much exceed the body in length ; the meropodite, 

 besides the usual terminal claw, has both its edges serrated, 

 the lower edge very conspicuously so, four or five of its 

 serrations in the proximal half forming large spines ; the 

 carpopodite has two terminal spines, one above, the other 

 below ; the propodite in its palmar portion has both edges 

 strongly serrated, the serrations of the upper edge forming 

 distinct spines. 



(In the male) the " pollex " of the fifth pair of legs is much 

 shorter than the dactylus. The first pair of abdominal 

 appendages in the male has the usual spoon-shape. 



A single male from off Colombo, 675 fathoms, measures 

 79 uiillim. from rostrum to tip of telson in the median line. 



The characteristic features of this species are : — (1) the 

 great breadth of the carapace posteriorly, (2) the diminutive 

 size of the antennulary scale, (3) the deficient spinature of 

 the median carina of the carapace, (4) the great length of 

 the chelipeds. 



68. Pentacheles Ilextii^ sp. n. 



Carapace uniformly and thickly setose and covered every- 

 where with spines and spiny granules ; its greatest breadth, 

 which is in its posterior third, is less than two thirds of its 

 greatest length ; the median carina ends in a single rostral 

 spine, between which and the cervical groove is a close series 

 of spinules, five or six of which are large, while between the 

 cervical groove and the spiny posterior border of the carapace 

 is a double row of close-set sharp serrations ; the frontal 

 margin is serrated throughout, and there is also a spine at 



