186 



The eyes are large, and the whole of the coriaceous ophthalmic tergum is 

 exposed. The antennular tergum, which is about as long as broad, is unarmed, 

 and has the stridulating ridge on either side well developed in both sexes and 

 at all ages. The antennular peduncle is more than half the length of the cara- 

 pace : the basal joint is longer than the 2nd and 3rd joints combined and longer 

 than the flagella. 



The antennal peduncle is plentifully spinose in the young, but in the adult 

 only the outer edge of the last three joints is serrated : the stridulating tubercle 

 is well developed and is striated on its inner (clasping) surface : the antennal 

 flagellum is more than twice as long as the body and is spinulose along the 

 inner edge. 



The external maxillipeds reach just beyond the near end of the basal joint 

 of the antennular peduncle. 



In the male the thoracic legs increase in length and decrease slightly in 

 thickness in succession, from the 1st pair, which are about seven-eighths the 

 length of the carapace, to the last pair, which are as long as the carapace and 



first 4 or 4?- abdominal somites combined, and all are monodactylous. 



In the female they increase in length up to the 4th pair, the 5th pair, which 

 are almost perfect chelae, being no longer than the 4th. 



In the male the yasa efferentia project from the coxa? of the 5th pair as 

 large acutely-conical coriaceous styles. 



The abdominal appendages (2nd-5th somites) of the male consist each of a 

 single small broadly-oval plate articulated to a short protopodite ; but in the 

 female they are all biramous, each consisting of a large foliaceous outer branch, 

 and an inner branch which is itself biramous. 



In the largest specimen the carapace is 70 millim. long, the abdomen 99 

 millim. 



Prom the Gulf of Manar and the Arabian Sea off the Travancore coast, 143, 

 224 to 284, and 719 fathoms. The largest specimens came from the least 

 depth. 



8795-8813 3374-3379 3387 



Kegd. Nos. 



9 - 10 " 10 



Family Axiidw, Spence Bate. 



pence Bate, Challenger Crust. Macrnra, p. 36: Stebbing, Hist. Crust., p. 187 : Ortmann in Bronn's Thier 

 Reich, Malacostraca, p. 1141. 



Carapace somewhat compressed, rather short, not overlapping the 1st 

 abdominal tergum, produced anteriorly into a short triangular rostrum. The 

 last thoracic somite is movable, and the last thoracic sternum separate. The 



