50 



a channel, (2) an outer short and rigid style with a broadly laminar base and 

 with a little hook on the outer edge of its truncated tip, and (3) a long median 

 rod which branches distally into six more or less distinctly prehensile stiff 

 filaments. 



There are 8 gills on either side : the 1st is a podobranch attached to the 

 external maxillipeds, the next 3 are pleurobranchs, attached one each to somites 

 JX-XI, the next 4 are pleurobranchs attached two each to somites XII and XIII. 



In the largest specimen the carapace is 19'5 millim. long, the abdomen 43 

 millim., measured in the mid-dorsal line. 



Colours in life : blood-red, eyes black. 



Common in the Bay of Bengal, 145 to 840 fathoms, in the Arabian Sea, 

 364 to 902 fathoms, and Andaman Sea, 265 to 419 fathoms. 



The species seems to me to be doubtfully distinct from S. robustus 

 S. I. Smith. 



542 4790-4792 3115 6269-6270 



Kegel. Nos. 6 -^^° (Types of the species): f 



9202-9203 _ 9207 _ 9211 _ 313 . 812 . 2586-2587 . 3407 . 3420 _ 3865 

 y * ~9~ " IT " To " 10 " 10 ' 10 * 10 - 10 ' 



25. SergestCS sp. ? itlOUS, Faxon. 



Sergestes mollis, Wood-Mason, Ann. Mag. Xat. Hist. (6) VIII. 1891, p. 353. 



? Sergestes inous, Faxon, Bull. Mus. Comp., Zool., XXIV. 1893, p. 21li, and Mem. Mus. Comp. Zool., XVIII. 

 1895, p. 208, pi. li, fig. 2. 



Integument membranous : tissues flaccid. 



Rostrum ascendant, blunt, very short. Gastro-hepatic groove distinct. Xo 

 spines on the carapace. 



Outer border of the exopodite of the tail-fan setose only in its distal fourth, 

 beyond a microscopic denticle. 



Eyestalks two-thirds the length of the basal joint of the antennular peduncle, 

 " smeared with black pigment," eyes black, little wider than their stalk. 



Antennular peduncle robust in all its joints, a little more than half the length 

 of the carapace measured in the mid-dorsal line, its 1st segment being slightly 

 the longest of the three and being hollowed for the eye : the lower (outer) 

 flagellum, in the male, has the usual accessory prehensile flagellum. 



Antennal scale barely half the length of the carapace measured in the mid- 

 dorsal line : its tip is broadly rounded, and its outer edge, Avhich is hardly 

 thickened, ends in a microscopic spinule. 



The first 3 pairs of legs resemble those of 8. bisulcatus, but are far more 

 slender. The 4th pair also resemble those of 8. bisulcatus, but their joints are 

 not so broad. 



