81 



hook-like spine the tip of which reaches to the posterior border of the 4th 

 tergum. The 6th abdominal somite is quite half as long again as the 5th, and 

 the telson is at least as long as the exopodite of the caudal swimmeret. 



The eyes are much narrower than the eyestalks and are pale brown in 

 colour. 



The antennular peduncle does not reach a third of the way along the 

 antennal scale ; its basal joint is not so deeply concave dorsally, and the " scale " 

 at the base of the outer border of this joint reaches beyond the joint. 



The antennal scale is more than two -thirds the length of the carapace 

 proper : the tooth at the far end of the outer border of the 2nd joint of the 

 peduncle is small and has no fringe of seta?. 



The thoracic appendages have the same structure and much the same 

 proportions as in A. ezimia, but the third pair of legs, which when pronated reach 

 only just halfway along the antennal scale, are a little shorter than the 4th and 

 5th pairs. 



Colour in life deep crimson. 



In the largest specimen the length of the rostrum is 22 millim., of the 

 carapace 23 millim., of the abdomen 61 millim. 



Found here in the Bay of Bengal in 1748 fathoms. 



-n t -vr 6754r-f>735 

 Regd. NO. 5 . 



43. AcanthepJiyra curtirostris, Wood-Mason. 



Acunthephyra curtirostris, Wood-Mason, Ann. Mag. Nat. Hist., Feb. 1891, p. 195, and May 1892, pp. 364, 365, 

 fig. 5 : Faxon, Mem. Mus. Comp. Zool., XVIII. 1895, p. 164, pi. xliii. figs. 2-5. 



Illustrations of the Zoology ok the Investigator, Crustacea, Plate III. Fig. 4. 



Differs from A. eximia in the following characters : — 



The carapace and rostrum are both very short, their combined length beino- 

 only half that of the abdomen without the telson : the carapace is not distinctly 

 carinated behind the gastric region. 



The rostrum has the form of a very thin and high, obliquely ascendant 

 frontal crest, the acuminate peak of which does not surpass, often does not reach, 

 the end of the antennular peduncle : its dorsal border is 7-9-serrate, and there is 

 a single spine in the middle of the semi-perpendicular ventral border. 



Cervical groove fine, but visible : post-antennal spine large and produced 

 backwards to the end of the hepatic groove as a sharp carina. 



Abdominal terga carinated as in A. eximia, except that the tooth terminating 1 

 the carina of the 6th tergum is hardly defined, and that the tooth terminating 

 the carina of the 3rd tergum, though larger than those of the 4th and 5th terga, 

 11 



