170 



Colour in life, pink. 



Off the Travancore coast, 1043 fathoms. 



The specific name andamanensi* is the result of a mistake. 



KQO 



Regd. No. (Type of the species). 



98. Polycheles ccratus, Alcock. 



Pentacheles ceratu$, Alcock, Ann. Mag. Nat. Hist., March 1894, p. 241. 



ILLUSTRATIONS OF THE ZOOLOGY OF THE INVESTIGATOR, CRUSTACEA, PLATE VIII. Fie. 1. 



Differs from P. phosphorus only in the following characters: 

 The carapace is very little longer than the first 6 abdominal somites. Its 

 lateral borders are armed, in front of the cervical groove with 6 + 2 spines, but 

 behind the cervical groove there are only 2 or 3 spines large enough to be seen 

 by the naked eye. In front of the cervical groove the median carina is armed as 

 in P. phosphorus with 2 + 1 + 1 + 2 + 1 spines, but behind the cervical groov 

 there are only 2 pairs of spines including the pair on the posterior borr" 

 There is no spine at the inner angle of the orbital notch, and none at the fi- 

 end of the eye-stalk. There is a spine at the bifurcation of the cervical 

 on either side, and there is a fine and slightly sinuous ridge parallel 

 posterior half of either lateral border, but otherwise the carapace is smoou. 



The carina of the 5th abdominal tergum ends in a huge antrorse claw-like 

 spine the point of which overhangs the anterior border of the 4th tergum. 



There are no spines at the outer ends of the 1st abdominal tergum. 



There are 2 spinelets at the outer angle of the basal joint of the antennular 

 peduncle. 



The large chelipeds are perfectly smooth, except for the terminal spines of 

 the merus, carpus, and palm. 



In an egg-laden female the length of the carapace in the middle line is 34 

 millim., of the abdomen 45 millim., and that of the large cheliped is 89 millim. 



From the Andaman Sea, 922 fathoms. 



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



99. Polycheles sculptus, S. I. Smith. 



Polycheles scidptus, S. 1. Smith, Proc. U. S. Nat. Mus. 1879 (1880) II. p. 345, pi. vii. and Ann. Mag. Nat. Hint. 

 (5) V. April 1880, p. 269 : Caullery in Ann. 1'Univ. Lyon, 1896, p. 385. 



Pentacheles sculptus, S. I. Smith, Bnll. Mns. Comp. Zool. X. 1882, p. 23, pi. iii..iv : and Albatross Crast. in 

 Rep. U. S. Fish. Coram. for 1882 (1881), p. 358, and 1885 (1886), p. 46 : A. Agassiz, Bull. Mus. Comp. Zool. XV. 

 1888, p. 42, fig. 239 : Alcock and Anderson, Ann. Mag. Nat. Hist. (7) 111. 1899, p. 289. 



Polj/cheles spinosus, A. Milne Edwards, Bull Mus. Comp. Zool. VIII., Dec. 1880, j). 6(i. 



Differs from P. phosphorus only in the following characters : 



The median carina of the carapace carries, between the rostral spines and 



