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



genus Leptochclia on account of the form of the uropoda; in Leptochelia the uropoda are 

 biramose, but the outer branch is rudimentary and one-jointed, while the inner branch is 

 multiarticulate ; in the present species they are characteristically similar to those of 

 Paratanais. The antennules of the male Leptochelia have a far larger flagellmii 

 (five to nine joints) than is to be found in this or other species of the genus Para- 

 tanais. In figs. 3, 4 of PI. XVII. the chelipedes are shown in two differenl positions; 

 the most remarkable feature about this appendage is the " hand," which is extremely 

 large and of an unusual structure; the distal joint or "finger" is immensely elongated 

 and reaches back as far as the second joint of the appendage when in a condition of rest ; 

 the fifth joint has as usual a long prolongation which forms the lower limb of the 

 forceps ; this region of the fifth joint is, however, not rigidly connected with the proximal 

 portion, but is freely movable upon it by means of an articulation ; when the limb is not 

 being used for prehensde purposes this joint appears to take the position indicated in 

 fig. 4 ; it lies back along the fourth joint, and is covered by it; the distal joint of the limb 

 lies back parallel to this, so that the whole appendage comes to have a superficial similarity 

 to the corresponding appendage in many other Isopods, such as, for example, Scrolls. A t 

 the point of articulation with the proximal region of the fifth joint the distal portion is 

 narrow, afterwards it is wide and uneven, and along the inner margin projects into two 

 tooth -like processes of which the distal is the longer ; the extremity of the joint is 

 pointed and curved upwards. 



The remaining thoracic appendages are like those of the female, and are specialized 

 into two series ; the three anterior pairs are more slender than the three posterior pairs. 



All the abdominal appendages are present ; the five anterior pairs (fig. 8) have tin 

 normal structure, consisting of a stouter basal joint and two flattened rami fringed with 

 long hairs. 



The uropoda (fig. 7) are longer than the terminal segment of the abdomen; they are 

 biramose, each of the rami being distinctly two-jointed; the exopodite is, however, more 

 slender than the endopodite. The structure of those appendages is therefore quite in 

 accord with the systematic position assigned to the species. 



Station 149h, off Cumberland Bay, Kerguelen, January 2D, 1874 ; hit. 48° 45' S., 

 long. 69° 14' E. ; depth, 127 fathoms; volcanic mud. 



Batlnjtanais, n. gen. ? 



In my third preliminary notice on the Challenger Isopoda 1 I described a species from 

 deep water in the North Pacific, under the name of Paratanais batlujbrotes. Since then 

 I have examined a large number of individuals from Port Jackson, which seem hardly to 

 differ specifically. As there were a large number of individuals there were probably 



1 Proc. Zool. Soc. Land., loc. cit. 



