REPORT ON THE CRUSTACEA. MACRURA. 277 



joints reflexed ; the basecphysis is rudimentary, the coxa carrying a pedunculated 

 mastigobranchia, to the base of which, near the joint, is attached a well-developed 

 podobranchial plume. 



The second pair is long, pediform, seven-jointed, and thickly pilose. The basec- 

 physis is slender, small, and almost rudimentary. The coxa carries a pedunculated 

 mastigobranchia without any branchial plume, but two arthrobranchial plumes are 

 attached to the membranous articulation between the coxa and the pleura. 



The first pair of pereiopoda is shorter than the second gnathopod, chelate, having 

 the carpos but little longer than the propodos, measuring from the tips of the pollex to 

 the carpal joint; the ischium and basis are each armed with a strong tooth on the 

 anterior distal angle, and a tubercle tufted with hairs projects on the inner side of the 

 coxa ; the basecphysis is slender and as long as the ischium. The coxa carries a mastigo- 

 branchia without a plume attached, the second pair of pereiopoda is longer than the 

 first, the carpos being twice the length of the propodos, and the basisal joint is armed 

 with a strong tooth ; the basecphysis is shorter than the meros and the mastigobranchia 

 is without a plume. The third pair of pereiopoda is much longer than the second, and 

 nearly twice as long as the first, the carpos being slender and four times the length of 

 the propodos. There is a small tooth on the basisal joint and the basecphysis is 

 rudimentary ; the two following pairs are long, slender, and terminate in a simple 

 styliform dactylos, the terminal pair being much longer and more slender, and having 

 the propodos twice the length of the carpos and distally fringed with long hairs ; both 

 of these carry a short and almost rudimentary basecphysis, but only the former carries 

 a mastigobranchia, the rigid peduncle of which is long and the foliaceous plate short, and 

 the last somite carries only a pleurobranchial plume. 



The pleopoda are moderately long and biramose, except the first pair, which has the 

 inner branch reduced to a rudimentary condition (fig. 1") in the female, and developed to 

 a large and longitudinally corrugated petasma in the male (fig. 2"). 



The telson terminates in a sharp point, flanked on each side by a sharp but strong 

 tooth, anterior to which is a row of hairs. 



Judging from the numerous specimens in the collection, thirty of which were taken 

 at one station associated with Artemesia longinaris, the males differ from the females in 

 being one half shorter. 



Philonicus lucasii, Spence Bate (PI. XLII. fig. 4). 



Solenocera Lucasii, Sp. B., Ann. and Mag. Nat. Hist., ser. 5, vol. viii. p. 185, 1881. 



Rostrum short, dorsally crested and laterally compressed, armed with seven teeth on 

 the upper margin ; the lower margin smooth. Pleon compressed and carinated from the 

 third somite, the carina terminating in a small tooth at the posterior extremity of the 



