44 



THE VOYAGE OF H.M.S. CHALLENGER. 



eurved spine on its inner liorder, and the carpus several on its upper and outer surfaces ; 

 the fingers are excavated internally, and have numerous tufts of bristle-like setae 

 scattered over their surfaces. The meral, carpal, and jiropodal joints of the ambulatory- 

 limbs are moderately spiny on the superior and inferior borders and the posterior surface ; 

 the dactyli have several basal spines both above and below, their a|)ices are black, acute 

 and horny. The legs of the last pair are smooth, with the terminal jjortion densely 

 pubescent. 



The first abdominal segment bears two small submedian spines, the second bears a 

 pair of large size and has a raised posterior border, the penultimate segment has two 

 small spines on its posterior border. 



The above description is taken from a male. The female is of larger size and 

 presents the following points of difi'erence — the rostrum is shorter, especially its 

 terminal portion, the chelipedes are less strongly developed, the plates on the left 

 side of the abdomen possess a few marginal spines, and the central abdominal tubercles 

 show a tendency to become spiny ; the right border of the abdomen also is armed with a 

 series of elongated spines. 



Lithodes miwrayi is apparently most closely allied to Lithodes maia, but the latter 

 species is of larger size, and the spines on the carapace are more numerous and more 

 uniformly equal in size. 



The following are the chief measurements in both sexes ; — 



Breadth of carapace, 



Length of carapace, 

 ,, of rostrum, 

 „ of right chelipede, 

 , , of first ambulatory limb, 

 „ of abdomen. 



Diameter of eggs, nearly 



Habitat. — Station 145a, off Prince Edward Island; 

 volcanic sand. 



dejith, 310 fathoms; bottom, 



Two specimens, a male and a female, the latter bearing ova, are in the collection. 



I have pleasure in associating this fine species with the name of the Director of the 



Challenger Commission. 



Genus Paralomis, White. 



Paraloniis, "White, Proc. Zool. See. Lond., p. 134, 1856, sine descr. 

 „ Stimpson, Proc. Acad. Nat. Sci. Philad., p. 69, 1858. 



Rostrum usually trispinose. Antennal acicle spinulous and freely movable on the 

 second segment of the peduncle. Abdomen with the lateral plates of the third, fourth, 



