196 EEV. T. R. R. STEBBING ON TWO 



joint is stronoly spined on its inner surface. The finger is long, but a little 

 shorter than the third joint. 



The first and second gnathopods are characteristic o£ the genus, with their 

 great oval hands and long fingers closing over the very oblique convex 

 spine-fringed palms. The second gnathopod is larger than the first, and has 

 the process of the v^rrist somewhat acutely produced. The first and second 

 perseopods are slender and not exactly alike, since in the first pair the sixth 

 joint is rather longer than the fifth and rather shorter than the seventh, but 

 in the second pair it is rather shorter than either the fifth or the seventh. 

 The three following pairs have the second joint expanded though not very 

 strongly, but they agree with one another in having an acute projection of 

 the hind margin at about the middle. Something similar to this is found in 

 the third and fourth perseopods of R. aculeata (Lepechin) , but in that species 

 it disappears from the fifth pair, whereas in the present species in the fifth 

 pair it is greatly accentuated, so that by this character alone the new form 

 can be distinguished from all hitherto described members of the genus. As 

 in other species, the fourth joint is short in the first and second perseopods 

 but long and spinose in the remaining three pairs. The last three joints of 

 the third and fifth pairs in our specimen were missing. 



The marsupial plates attached to the second gnathopods and the first two 

 pairs of perseopods are voluminous, but those on the third pair are narrow. 

 In all, the fringes of the margin were rather scanty. The branchial vesicles 

 are rather large on the second gnathopods and first two pairs of perseopods, 

 diminishing on the next two, and on the fifth pair very small, being here 

 transversely instead of longitudinally oval. 



The pleopods are strong, with two slender coupling-hooks on the peduncle, 

 five or six cleft spines to the inner ramus, and about twenty-three joints to 

 each of the rami. The uropods have lanceolate rami, those of the first pair 

 rather shorter than the peduncle, those of the other two pairs longer than their 

 respective peduncles; the inner ramus of the second pair considerably longer 

 than the outer and longer than any of the other rami. The telson is elongate, 

 tapering, as long as the peduncle of the first uropod, with a pair of ciliated 

 hairs or setse near the base, the apices on each side of the small cleft acute. 



The specimen in spirit colourless. 



Length, from tip of rostrum to end of telson, 13*5 mm. 



Locality. Lat. 59° 36' N., long. 7° 0' W., from a depth of 400 m. 



The specific name calls attention to the differential characters in the palps 

 of the mandibles and maxillipeds. 



