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



continued in a nearly straiglit line along the branchial region 

 almost to the posterior margin ; its sides bulge so as to throw 

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

 postfrontal spine is rather larger. Tiie abdominal hump 

 appears to be more strongly developed ; the sixth abdominal 

 tergum is deeper, more strongly arched 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 

 r.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 tlie meropo- 

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



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

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

 posterior margin, 16'5 millim. ; of antennal scale 7*0 raillira. ; 

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

 sixth tergum 9'2 millim. ; of telson 7"0 millim. ; breadth of 

 thorax across branchial regions 6 millim. ; of abdomen across 

 hump 4 millim. 



'J\vo females were taken on April 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 

 tiie 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, 

 p. 37, pi. V. fig. 2, ? ,et 1886, p. 78, c5^ ? , Western Atlantic, 

 444-1 o42 fathoms) ; P. acutifrons, Sp. Bate ('Challenger' 

 Macrura, 1888, p. 871, pi. cxli. fig. 3, 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. Ph}/eAlcocki\W.-U. 



rurapasiijha'e Alcocki, W.-M., Ann. & Mag. Nat. Hist. (6) vii., 1891, 

 p. 196, S ; et 111. Zool. ' Investigator,' pt. i., 1892, Crust, pi. iii. fig. 5. 



From P. princeps and P. acutifrons it differs in the form of 

 the postfrontal spine (which is thin and foliaceous, terminates 

 abruptly in front in a strongly sinuous and almost vertical 

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



* QfjTjTTav f] wofia i'lir). — Arist., Ath. Pol. 14. 



