284 Carcinological Fauna of India. 



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 

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

 in the male, 15 millim. in the female. 



Has been dredged in 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 696 fms., off the Maldives at 719 fins., and off both 

 coasts of Ceylon at 406 to 296 fins. 



103. JEthusa pygmiea, Alcock. 



Ethusa pygnifea, Alcock, Ann. Mag. Nat. Hist., May 1894, p. 406, and 111. Zool. 

 ' Investigator,' Crust, pi. xiv. fig. 5, % . 



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



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

 genous female — having the carapace slightly 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 plainly defined by 

 grooves. 



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



104. Ethusa andamanica, Alcock. 



Ethusa andamanica, Alcock, Ann. Mag. Nat. Hist., May 1894, p. 405, and 111. 

 Zool. ' Investigator,' Crust, pi. xiv. fig. 8, young $ . 



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 bi'anchial regions are a little tumid dorsally, 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 antenuulary 

 joint is not enlarged. 



289 



