Indian Deep-sea Dredging. 239 



middle line are, lor the female 97millira., for the largest male 

 80 inillim. 



The characters of this species are : — (1) the extremely 

 spiny nature of the integument, and (2) the peculiar forma- 

 tion of the ophthalmic notches, which superficially are divided 

 into two portions by the meeting of the edges across the 

 ophthalmic peduncle. 



69. Pentacheles andamanensis, sp. n. 



Carapace with few distant spinules; its greatest breadth, 

 which is in front of the cervical groove, is two thirds its 

 greatest length ; the median carina ends in a double rostral 

 spine, between which and the cervical groove is a row of four 

 spines, of which the penultimate is double, and between the 

 cervical groove and the broad posterior margin are three pairs 

 of spines; the frontal margin is smooth, with a spine on the 

 inner side of each orbital notch; the lateral margins are 

 spinate and sparsely setose, the spines numbering 5 + 3 in 

 front of the cervical groove and 6 behind it ; the gastric 

 region is bounded on each side by a sinuous row of 6 large 

 spines, and the cardiac region by an oblique spiny ridge ; the 

 branchial regions are traversed dorsally by a very slightly 

 sinuous five-toothed sublateral ridge, and ventrally by the 

 two usual serrated ridges. 



The abdominal terga are smooth, all including the front 

 part of the telson are carinated, the caringe of the first five 

 culminating in procumbent spines, that of the sixth being 

 double with beaded edges, and that of the telson being 

 simple; the first five terga are obliquely and faintly grooved 

 on each side of the median carina. The pleurae are smooth, 

 with the setose margin denticulated ; all are strengthened by 

 a salient midrib. 



The orbital notches are broad, smooth-edged, rather shallow ; 

 the ophthalmic peduncles have a strong spine at the frontal 

 level. 



The basal joint of the antennules has two spines at the 

 antero-external angle ; its scale is hardly larger than the 

 antennal scale, the former ending in a spine, the latter obtusely 

 pointed. 



All five pairs of thoracic limbs are chelate (in the female) ; 

 the great chelipeds are less in length than the body by three 

 fourths the length of the telson ; the meropodite has both 

 edges smooth, except for two spines near its proximal end and 

 one terminally on the upper edge ; the carpopodite has a 

 terminal spine of the usual claw-like shape above ; the edges 



