32 



arises near the antero-external angle of the rather broad merus, and is com- 

 pletely exposed in flexion. 



The afferent branchial orifices are wide openings immediately in front of the 

 bases of the chelipeds. 



The chelipeds in the adult male are often unequal : the legs have the same 

 form and relations as in Dorippe, but the last two small and dorsally placed pairs 

 are not subchelate, although their little hook-like dactylus folds backwards. The 

 dactyli of the 1st and 2nd pairs are palmulate and are very long and stout. 



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

 being fused, that of the female consists of 7 separate terga. As in Dorippe the 

 first three terga are visible in a dorsal view. 



There is very little hair about the carapace and larger appendages. 



In the Indian seas the species of this genus are, so far as is known, found 

 only at depths of between 200 and 1,300 fathoms. 



Ethiisa indica, Alcock. 



Ethusa indica, Alcock, Ann. Mag. Nat. Hist., May, 1894, p. 405, and 111. Zool. ' Investigator,' Cmst. pi. xiv. 

 fig. 2. I , and J. A. S. B. Vol. LXV. pt. 2, 1896, p. 283. 



Carapace convex ; its extreme length, including the frontal teeth, in the 

 male only just exceeds, and in the female equals, its extreme breadth ; its surface 

 is finely and closely granular almost everywhere, except sometimes on the cardiac- 

 intestinal region. 



The branchial regions are much swollen, both dorsally and laterally, the 

 lateral swelling making the carapace more than one-third broader across the 

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

 The cardiac-intestinal region is small and well defined, and although it is tumid 

 it is commonly sunk below the level of the branchial convexities. The anterior 

 regions of the carapace are undefined. 



The spine at the external orbital angle is broad-based, but long, slender, and 

 acute : it projects obliquely outwards well beyond the tips of the frontal teeth. 

 The two pairs of frontal teeth are longish and acute — the outer pair being some- 

 what the longer : they as well as the external orbital spine are a good deal con- 

 cealed in a fringe of long hairs. 



The eyestalks are short slender and freely movable : the eyes are often a 

 little deficient in pigment. 



The basal antennule-joint is not abnormally enlarged. 



The chelipeds in the adult male only are asymmetrical, aU the joints of one 

 side being enlarged in all dimensions : the smaller cheliped is hardly as stout as 

 the first two pairs of legs. 



