34 



The chelipeds of the adult male are unknown : in the female they are not 

 so stout as the first two pairs of legs. 



The second pair of legs in the female (adult male unknown) exceed the first 

 almost by the length of the dactylus, they are three times the length of the 

 carapace and about 2^ times the length of the 4th pair. 



The extreme length of the carapace of the largest specimen, which is not 

 adult, is 9-5 millim., the extreme breadth 9 millim. 



Andaman Sea 188 to 220 fms., and 238 to 290 fms. 



This species may possibly be only a variety of Ethusa oriental-b, Miers, 

 Challenger Brachyura, p. 330, pi. xx\nii. fig. 4. 



Subgenus Ethusina, S. I. Smith. 

 In Ethusina the carapace has a slightly more elongate appearance, and the 

 basal joint of the antennules is enlarged swollen and globular so as to push the 

 eyestalks permanently outwards. 



Ethusa fEthusina) gracilipes, Miers. 



Ethuxu {Ethusina) gracilipes, Miers, Challenger Brachyura, pp. 332, 333, pi. xxix. 



jEthusina gracilipes, Faxon, Albatross Stalk-eyed Crastacea, Mem. Mus. Gomp. Zool. Vol. XVIII. 1895, p. 36. 



Of this species, which is known from deep water in the East Indian Archi- 

 pelago and also off the Pacific coast of Central America, the Investigator has 

 dredged one specimen in 836 fms., between the Maldives and C. Comorin. 



Etliusa (Ethusina) investigator is, Alcock. 



Ethusa {Ethusina) inrestigalo'-is, Alcock, J. A. S. B. Vol. LXV. pt. 2, 1896, p. 285. 



Carapace manifestly longer than broad, somewhat convex, smooth to the 

 naked eye though finely granular under the lens. 



The branchial regions are a good deal swollen both dorsally and laterally, 

 bulo'ing out the lateral margins and making the carapace a third broader across 

 the middle of the branchial regions than across the bases of the external orbital 

 spines. 



The cardiac-intestinal region is well-defined and tumid, but not sunk below 

 the level of the branchial convexities : the anterior regions of the carapace are 

 fairly well defined. 



The frontal portion of the carapace is separated from the rest of the cara- 

 pace by a transverse groove or crease. The external orbital spine is long and 

 needle-like, but its tip falls considerably short of the tips of the rather long 

 acute frontal spines. 



The basal antenna-joint is huge and swollen, almost globular in shape. 

 Owing to its size the eyes are pushed outwards until the eyestalks have come to 



