53 



27. Sergestes hmtlifer, Alcock and Anderson. 



Sergntii hamifer, Alcock and Anderson, Jonrn. Asiatic 8oc. Bengal, Vol. LXJIJ. pt. 2, 1894, p. 148 : Hnnten, 

 P. Z. S., 1890, pp. 961, 903. 



IM.I KTKATioxK OF THE ZOOLOGY OF THE INVESTIGATOR, CRUSTACEA, PI.ATK IX. Fiu. 8. 



Rostrum slightly ascendant, acutely pointed, reaching nearly halfway along 

 the eyestalk. A miniate post-ocular and an even more minute hepatic spine are 

 present. Cervical groove fine, but distinct. The other markings of the cara- 

 pace as in 8. mltroyuttatus. 



The outer border of the exopodite of the caudal fan has neither spine nor 

 seta3. 



Eyestalks about two-thirds the length of the basal joint of the antecnular 

 peduncle : eyes black, not wider than their stalk. 



Antennular peduncle about two-thirds the length of the carapace, measured 

 in the middle line : the elongate-triangular basal joint is hollowed for the eye 

 and is about as long as the slender cylindrical 2nd joint : the 3rd joint is 

 decidedly the longest and slenderest of all. The outer (upper) flagellum is as 

 long as the body, the inner flagellum in the female is shorter than the eyestalk. 



Antennal scale slender and acute, more than half the length of the carapace, 

 its edges are setose. 



The 2nd maxillipeds are very stout. The external inaxillipeds an- t';ir 

 stouter than the legs and are far the longest of all the appendages, being longer 

 than the entire body and twice as long as the 3rd pair of legs : they are <|iiite 

 devoid of seta?, but their penultimate joint, which is curved and is much broad- 

 ened and compressed in its distal moiety, is armed along the posterior border of 

 that moiety with a series of acicles, as is also the posterior border of the terminal 

 joint: the terminal joint is divided into 4 segments and ends in a spine which is 

 articulated to the last sub-segment. 



The legs are very slender and short: they are without seta-, but in the first 

 pair the posterior border of the 3rd and terminal joints have a row of fine short 

 tooth-like bristles. The 1st pair are about half the length of the carapace ; the 

 3rd pair, which are the longest, are as long as the carapace and first abdominal 

 somite. The 4th pair are about three-fourths the length of the carapace and 

 have the three terminal joints thin and compressed. The 5th pair, which are 

 very slender, are not half the length of the carapace. 



The branchia? are 8 on either side, namely, a podobranch on the external 

 maxillipeds, a pleurobranch on somites IX-XI, and two pleurobranchi;e the 

 upper one of which is reduced in size on each of somites XII and XIII. 



Arabian Sea, in the neighbourhood of the Laccadives, 1870 fathoms. 



Regd. No. ' - (Type of the species). 



