33 



The second pair of true legs are not very much longer than the first : in 

 the adult male they are a little more than three times the length of the carapace, 

 and slightly more than three times the length of the 4th (last) pair ; in the 

 female they are not quite three times the length of the carapace, and about 2f 

 times the length of the 4th pair. 



The abdomen of the male consists of 5 pieces, the 3rd-5th terga being 

 fused together. 



The extreme length of the carapace is in the fully adult male 16-5 millim., 

 in the fully adult female 15 milhm. ; the breadth 16 millim. in the male, 

 15 millim. in the female. 



Has been dredged m the Andaman Sea at 240 fms., in the " Swatch " of 

 the Gangetic Delta at 409 and at 405 to 285 fms., in the Laccadive Sea at 360 

 and 696 fms., off the Maldives at 719 fms., and off both coasts of Ceylon at 406 

 to 296 fms. 



Ethusa pygmcea, Alcock. 



Ethusa pygms-.a, Alcock, Ann. Mag. Nat. Hist., May 1894, p. 406, and 111. Zool. ' Investigator,' Crnst. pi. xiv. 

 fig. 5, ? , and J. A. S. B., Vol. LXV. pt. 2, 1896, p. 284. 



Distinguished from E. indica only in the following particulars : — 



(1) its size is much smaller, the largest known specimen— an ovigerous 

 female— having the carapace sHghtly over 6 millim. long and nearly 7 millim. 

 broad : 



(2) the external orbital spines, though of the same slender acute shape, are 

 not so prominent, not reaching as far as the tips of the frontal teeth : 



(3) the anterior regions of the carapace are plamly defined by grooves. 

 Andaman Sea 188 to 220 fathoms, and 240 to 220 fms. 



Ethusa andafiianicci, Alcock. 



Ethusa a«damanica, Alcock, Ann. Mag. Nat. Hist., May 1894., p. 405, and 111. Zool. ' Investigator,' Crast. 

 pi. xiv. fig. 8, yonng i , and J. A. S. B., Vol. LXV. pt. 2, 1896, p. 284. 



Carapace flat, its extreme length only just exceeds its extreme breadth, its 

 surface finely granular under the lens, but smooth to the naked eye. 



The branchial regions are a httle tumid dorsaUy, but do not bulge laterally, 

 so that the convergent lateral borders are nearly straight. 



The external orbital spine is broadly triangular, with a mucronate tip which 

 does not quite reach to the tips of the frontal spines ; these also are acutely 

 triangular, and all are a good deal hidden by a fringe of long hairs. 



The eyestalks are short and rather stout, movable, but not very freely so : 

 the eyes are not deficient in pigment. The basal antennule-joint is not enlarged. 



