322 THE VOYAGE OF H.M.S. CHALLENGER. 



transverse ridge and the marginal lobes which are tufted with hair ; the meros is long 

 and broad, stout on the outer side and thin on the inner, which is fringed with hairs ; 

 the carpos is short, curved, and stouter at the propodal extremity than at the meral ; the 

 propodos is short, being not longer than the carjtos, and matted on the inner side with 

 many hairs ; the dactylos is stout and blunt-pointed, as long as the propodos, and matted 

 with hairs on the inner side. 



The second pair of goathopoda is seven -jointed, long and slender. The coxa carries 

 a mastigobranchial plate that supports a podobranchial plume, and the basis supports a 

 two-jointed ecphysis that is about half the length of the limb ; it is two-jointed, one 

 joint being small and the second long and multiarticulate. The ischium - is long and 

 narrow, the margins parallel, the inner margin thin and fringed with hair, the outer robust 

 and smooth ; the meros is about half the length of the ischium and a little shorter than 

 the carpos, which is rather longer than the propodos and terminates in a straight and 

 pointed dactylos that is half its length, and is movable to the extent of a right angle ; 

 it is not armed with impinging spinules at the base, but is excavated and smooth, all 

 the joints being fringed on the inner side with fine hairs. 



The two anterior pairs of pereiopoda are similarly formed, the second being longer 

 than the first ; all the joints, including the basis and coxa, are smooth, the latter carries 

 a mastigobranchia that supports a podobranchial plume, and the basis carries a small, 

 rudimentary ecphysis ; the carpos is long and slender, equalling in length the meros and 

 ischium together. The propodos is short, but the pollex is long and slender, equalling 

 in length and resembling in form the long, tapering dactylos, the margins of which are 

 sparsely fringed with a few, short, bristle-like hairs. The third resembles the two pre- 

 ceding pairs in form and general proportions, but differs in being longer and in having 

 on the coxa a large, hirsute protuberance, that is cupped on the outer side, and carries 

 on the inner the foramen opening into the oviducts. The fourth and fifth pairs are long, 

 slender, and simple, terminating in a styliform dactylos ; they both carry at the inner 

 side of the coxa a similarly formed tubercle to that of the third pair, and on the ventral 

 surface of the pereion, between the penultimate pair, is a large, anteriorly pointed and 

 posteriorly truncated thelycum (l"); the oviducts lie just beneath the anterior extremity, 

 which covers them until they are exposed by the outward and backward movement of the 

 legs. 



The pleopoda are long and slender, the first pair single, and having the second branch 

 in a rudimentary form attached to the basal joint near the middle of the inner surface. 

 The inner branches are throughout smaller than the outer ; the outer gradually decrease, 

 while the inner increase, posteriorly. 



The plates of the rhipidura are long, tapering, strengthened by longitudinal ridges, 

 and fringed with hairs. 



The telson is broken off near the extremity. 



