obtmned in the Indian Seas. 241 



second joint of the peduncle. The edges of the rostrum are 

 microscopically serrulate, as in /. laccadivensis. A median 

 dorsal carina passes back from the rostrum for a short 

 distance on the gastric region. On the average the rostrum 

 is lunger in the female. Little reliance can be placed on the 

 length of the rostrum in determining this species. 



The abdomen is longer than the carapace ; the pleura of 

 the second, third, and fourth abdominal segments are 

 vertically produced and pointed. Tlie carapace with the 

 rostrum is about as long as the first five abdominal segments 

 combined. The projecting ])leura are very pliable, yet retain 

 their smooth surface. In the female the appendages of the 

 first abdominal segment are uniramons, slender and long, 

 about I the length of those of the second segment ; in the 

 male they appear to be wanting. They also seem to be 

 "wanting in the male of /. laccadivensis, but are present and 

 well developed in the male of /. andumanensis. Tlie telson 

 has a small median posterior spine. 



The eye-stalks are veiy short and the eyes have no pig- 

 ment. All that is visible of the eyes is a fair-sized hemi- 

 sjdierical white lobule on either side of the base of the 

 rostrum. 



The upper antennular flagellum is about as long as the 

 carapace (without the rostrum) measured in the mid-dorsal 

 line, is slightly longer than the lower or inner flagellum and 

 is two or more times its thickness. 



Both '' styloeerite " and " scaphocerite^' are large; the 

 former is the longer and almost reaches the end of the 

 antennal peduncle. 



The exopodite of the second maxilliped is much longer 

 than the endopodite. The branchiae agree with the typical 

 formula of Iconaxiopsis as given by Alcock (Desc. Cat. Ind. 

 Deep-sea Crust., jNIacr. 1901, p. 194), except that I was 

 unable to find any rudimentary podobranch or arthrobranch 

 on the second maxilliped ; they differ widely from the 

 formula of Iconaxiiis (Spence Bate). 



The chelipeds are massive, chelate, and subcqual, the left 

 (rarely the right) being the larger in both sexes. Both 

 chelipeds are about the same length and are approximately 

 as long as the abdomcu ; more than half this length is made 

 up by the hand. The more massive cheliped has a longer, 

 deeper, and more inflated palm than the otlier. In the 

 former the palm is longer than the fingers, in the latter the 

 fingers are longer than the palm. The upper border of the 

 palm carries a row of (usually about 8) forwardly directed 

 and prominent spines^ which increase in size from behind 



