164 Messrs. J. Wood-Mason and A. Alcock on 



continued in a nearly straight line along the branchial region 

 almost to the ])osterior margin ; its sides bnlgc so as to throw 

 the narrow dorsal region into relief as a blunt carina, and its 

 postfrontal spine is rather larger. The abdominal hump 

 appears to be more strongly developed ; the sixth abdominal 

 tergura is deeper, more strongly arehed both above and below, 

 and is not produced to a spine in the middle of its posterior 

 margin, which, when viewed from above, appears quite 

 straight. In the first pair of legs the basipodite is furnished 

 ;.t the apex with one spine, but the meropodite is unarmed ; 

 in the second pair there is also a spine at the apex of the 

 basipodite, but only one on the lower margin of the meropo- 

 dite. Both eye-peduncles and cornege are more elongateil. 



Length, from anterior end of carapace to tip of telson, 57 

 niillim. ; of carapace, from middle of anterior to middle of 

 posterior margin, 16"5 millim. ; of antennal scale 7*0 raillim. ; 

 of abdomen, from base to tip of telson, 40"0 millim. ; of its 

 sixth tergum U"2 millim. ; of telson 7*0 millim. ; breadth of 

 thorax across branchial regions 6 millim. ; of abdomen across 

 hump 4 millim. 



'J'wo females were taken on Ai)ril 11th, 1888, 7 miles S.E. 

 by S. of Ross Island, Andaman Sea, in 265 fathoms. 



Phye *, gen. nov. 



Differs from Pasiphae in the carapace and abdomen being 

 more or less extensively and distinctly carinated dorsally, in 

 the former being armed in front with a pair of branchiostegal 

 spines, and in the telson being forked at the extremity. 



Includes P. princeps, S. I. Smith ('Albatross' Crust. 1884, 

 ]). 87, pi. v. fig. 2, ? ,et 1886, p. 78, (J ? , Western Atlantic, 

 44-4-1842 fathoms); P. acudfrons, Sp. Bate ('Challenger' 

 Macrura, 1888, p. 871, pi. cxli. fig. 8, South of Japan, 775 

 fathoms, and Coast of Patagonia, 245 fathoms) ; P. forceps ^ 

 A. M.-Edw. (Miss. Sc. du Cap Horn, Crust., 1891, p. 51, 

 pi. vi. fig. 2, Straits of Magellan, 326 metres) ; and the 

 following : — 



54. Phi/e Alcocki, W.-M. 



Parapa^phae Alcoeki, W.-M., Ann. & Mag. Nat. Hist. (6) vii., 1891, 

 p. 196, J; et 111. Zool. ' Investi^rator,' pt.i., 1892, Crust, pi. iii. fig. 5. 



From P, py-inceps and P. acutifrons it differs in the form of 

 the jjostfrontal spine (which is thin and fbliaceous, terminates 

 abruptly in front in a strongly sinuous and almost vertical 

 edge, and extends nearly to the posterior slope of the carapace 



* Qpf/TTav fi opofjiu *i7.— Arist., Ath. Pol. 14. 



I 



