116 



middle line, the two latter and the epibranchial being the acute endings of 

 carinse, which carinas are very distinct in the young. 



The carapace is so thin that the gills can be seen through it, and measured 

 in the middle line it is about a third the length of the abdomen. The 6th 

 abdominal somite is twice as long as the 5th and nearly as long as the telson. 



Byes very large, placed obliquely on the short stalks, dull and opaque. 



The antennular peduncle hardly extends to the middle of the antennal 

 scale ; its basal scale, which is spine-like, reaches to the end of the basal joint : 

 the antennular flagella, in the female, are of about equal thickness, and the 

 outer one reaches to, the inner one a short way beyond, the tip of the antennal 

 scale. 



The antennal scale, which is slender, is about three-quarters the length of 

 the carapace (without the rostrum) measured in the middle line ; its outer edge 

 ends very acutely : the flagellum is about twice the length of the carapace. 



External maxillipeds very stout : they reach, by at least half their terminal 

 joint, beyond the tip of the antennal scale. 



The first pair of thoracic legs, even with the dactylus flexed, reach a short 

 way beyond the tip of the antennal scale. The slender 2nd pair reach hardly 

 halfway along the merus of the 1st pair. The last two joints of the extremely 

 slender 3rd pair lie beyond the end of the antennal scale, when fully pronated. 

 The stoutish 4th and 5th pairs, which end in vertically-compressed dactyli, 

 reach a short way beyond the tip of the antennal scale. 



Colour in life : transparent clouded purple, eyes milky orange. Length 

 of carapace 12 millim., of abdomen 35 millim., measured in the middle line. 



Found here in the Andaman Sea, and off the Andaman coast of the Bay of 

 Bengal, in 265, 561, and 583 fathoms. 



A small specimen from the Andaman Sea, 238-290 fathoms, differs only in 

 having the outer antennular flagellum many times thicker than the inner, and 

 almost as stout as the peduncle. It is probably the male of this species. 



„ , , T 9935 3125 6740 6743 



Regd. Nos. _:— :_ :— . 



68. JPontophilus abyssi, S. I. Smith. 



Fontophilus aiyssi, S. I. Smith, in Report U. S. Fish. Comni. for 1882, p. 363; and tov 1885, Albatross 

 Decapoda, p. 49, pi., xi. figs. 3, 3a: Wood-JIason, Ann. Mag. Nat. Hist. (6) VIII. 1891, p. 361 : Ortmann, Proc. 

 Acad. Nat. Sci. Philad. 1895, pp. 183, 185. 



Differs from P. gracilis only in the following particulars : — 



(1) the rostrum does not reach to the end of the eyes, and the carapace is 

 considerably more than a third the length of the abdomen : 



