CRUSTACEA FROM THE 'CHALLENGER' EXPEDITION. 53 



creature, which on the whole has a strong family likeness to W. leptodactyla. It has 

 a length of 42 rnillims. 



The form of the carapace is nearly the same as in the former species. It has a length 

 of 19 rnillims., hy 18 of greatest width ; at its hase, however, it is only 10 rnillims. wide. 

 The denticulation of the edges is a much stronger one than in the preceding species ; 

 there is a line of spines divided hy two incisions into three divisions, the first of which 

 contains 7, the second 5, and the third 17 spines on each side, all bent forward and 

 somewhat upward. Two very prominent lines, one longitudinal, ending at the front with 

 a spine, and one transverse, form the figure of a cross ; and following the lines of 

 caruncles, you might trace the same regions which we have described in the former 

 species, but which in this case are not so clearly visible. At the frontal border there are 

 two spines on the right side and four spines on the left side of the median spine. The 

 whole carapace is finely covered by very small spines, which look like very fine chagrin. 



The interior antennae have several spines on the inner side of their three funiculus- 

 joints, but not such a wing-like expansion as we have observed in the former species. 

 The exterior flagellum has a length of 17, the interior of 7 rnillims. The exterior 

 antenna does not offer any thing particular. 



The parts of the mouth have exactly the same form as in the preceding species ; and 

 the absence of palpi at the base of the gnathopods can also be stated in this case. 



Of the five pairs of pereiopods only four are terminated by chelce ; and this is the chief 

 difference from W. leptodactyla. The first pair also are proportionally much shorter, 

 (only 34 rnillims. long), and have no spine on the slender fingers of the chela. In the 

 third and fourth pairs of pereiopods the chelae are much more slender than in the first. 

 The last one is terminated by a simple recurved claw. The last four pairs of pereiopods 

 are covered with hairs, but not so densely as in W. leptodactyla. The genital opening 

 is, in this species, not on the coxal joint of the third pair of pereiopods, but, as is usually 

 the case, on that of the fifth. 



The abdomen has a length of 23 rnillims. Its first segment bears one spine ; and all 

 the following ones have two spines on a little prominence. Telson, caudal appendages, 

 and lateral processes of the segment are fringed with hairs. 



The first pair of pleopods is transformed into two styliform and flattened appendages. 

 In the second pair (fig. 10) we observe the peculiarity that the third styliform joint is 

 covered by another, smaller joint, the morphological value of which I do not understand. 

 In the other three pairs (fig. 11) this supernumerary joint is not attached to the third one ; 

 so that these are very much like the pleopods of W. leptodactyla. 



Colour, and Habits of Life. 



Especially the larger of these two species was very beaiitif ul when it came up ; for it 

 was of a fine red, while the hairs bordering it were yellowish. The smaller one also \^ as 

 red. This colour, however, rapidly disappeared when the specimens had been for a 

 certain time in spirit. 



As was also the case with Gnathophausia, the larger species of the two was caught in 

 very deep, the smaller one in shallower water. W. leptodactyla was found on a plateau 



