REPORT ON THE CRUSTACEA MACRURA. 593 



articulus, projects beyond the base of the next and supports a few simple hairs, while 

 two fasciculi of membranous cilia stand on each. The lower and inner flagellum is 

 lonerer and much more slender than the outer, and is divided into twelve or fifteen 

 articuli, fringed at each articulation with minute hairs. 



The second pair of antennae is about the length of the animal and carries a scapho- 

 cerite that reaches beyond the extremity of the rostrum, the squamiform portion is 

 square at the extremity and fringed with ciliated hairs, the outer margin is smooth, 

 rigid; and arrned with a tooth near the distal extremity. 



The mandibles (fig. Id) correspond with those of Hippolyte varians, and consist 

 of a stout molar projection, obliquely truncate, and covered with minute teeth, hairs 

 and spinules, and a psalistoma that is slightly curved, pointed, and serrate at the inner 

 distal extremity. 



The first pair of siagnopoda (fig. le) is three-lobed, the outer lobe being styliform, 

 the style consisting of a long and nearly straight, sharp pointed spine. The second 

 pair was not examined. The third pair (fig. Ig) consists of three foliaceous plates of 

 great tenuity, fringed on the inner margin with ciliated hairs, the third plate supports 

 a long, slender, two-jointed appendage ; at the base of the first joint a membranous 

 mastio-obranchial lobe is attached. 



The first pair of gnathopoda (fig. lh) is six -jointed. The joints are broad and 

 flat, and fringed on the inner and distal margins with stout hairs delicately ciliated, 

 the terminal two joints are reflexed against the preceding ; the second joint carries a 

 stout and long basecphysis, terminating in a few obscure articuli and long and ciliated 

 hairs. 



The second pair of gnathopoda (fig. li) is of moderate length and tolerably 

 robust. It consists of five joints and is pediform. The coxa is broad and short, and 

 supports a double foliaceous appendage, as if it were the rudiment of a branchial 

 plume ; the basis supports a short and stout ecphysis that is about half the length of 

 the next joint, which is long and robust, and probably represents the ischium and 

 meros combined ; the fourth joint is short and broader at the distal extremity than at 

 the base, and supports a long, slightly tapering and curved joint that terminates in 

 three or four short stout spines. 



The first pair of pereiopoda (fig. Ik) is short and robust; the meros is armed 

 with a sharp projecting process on the upper distal angle, which receives and supports 

 the carpos when thrown back ; the carpos is short, broader at the propodal extremity 

 than at the meral, the upper margin projecting beyond the articulation and forming a 

 hollow cup, in which the basal portion of the propodos falls when the bmb is 

 extended. The propodos articulates with the carpos at the lower angle, it is dilated 

 on the upper surface, and is lodged in the hollow formed in the frontal wall of the 

 carpos ; the pollex is pointed and curved, and corresponds in form with the dactylos, 



(ZOOL. CHALL. EXP. — PART LII. — 1887.) Fff 75 



