35 



lie almost in the tran verse axis of the carapace, with the tips of the eyes just 

 visible, dorsally, beyond the lateral edge of the external orbital spine ; and in 

 this position they are almost immovably fixed. 



The chelipeds in the apparently adult male are symmetrical and are not 

 much stouter, except as to the hands, than the first two pairs of legs ; the hands, 

 however, are somewhat enlarged. 



The second pair of true legs exceeds the first by about a third of the length 

 of the dactylus ; they are more than 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. 



Length of carapace of an adult male 12-3 millim., extreme breadth 11-3 

 millim. 



Colours in life milk-white with the tip of the legs faint pink. 



From the Bay of Bengal 1,300 fms. and Laccadive Sea 1,200 fms. 



This species differs from E. gracilipes, Miers (1) in having the frontal portion 

 marked off from the rest of the carapace by a transverse groove, and (2) in the 

 different proportions of the eyestalks, which are long enough to expose the 

 whole of the eye beyond the sides of the external orbital spines, in a dorsal view. 



Ethusa (Ethusina) desciscens, Alcock. 



Ethusa (Ethusina) desciscens, Aloock, J. A. S. B., Vol. LXV. pt. 2, 1896, p. 286. 



This species is the connecting-Unk between Etlmsa and Ethusina, and justifies 

 the union of the two genera, proposed by Miers ; for although it has the huge 

 globular basal antennule- joint, the eyestalks retain a certain amount of 

 mobility. 



It closely resembles E. gracilipes and E. investigatoris, only differing from 

 the latter (1) in its smaller size, (2) in having the hand of one cheliped — in the 

 male — much larger than the other, and (3) in the greater mobility of the eye- 

 stalks. The eyestalks moreover are short, like those of E. gracilipes, and do not 

 expose the eyes to dorsal view on either side of the external orbital spine of the 

 carapace. 



Prom the Andaman Sea, 265 fms., and Laccadive Sea 912-931 fms. 

 Cymonomops, Alcock. 



Cymonomops, Alcock, Ann. Mag. Nat. Hiat., May 1894, p. 406, and J. A. S. B. Vol. LXV. pt. 2, 1896, p. 286. 



Carapace of the Dorippe type (that is to say having its greatest breadth at 

 its extreme posterior Umit and leaving about half of the abdominal terga exposed 

 to dorsal view), but arched anteriorly almost in a semicircle ; its regions well 



