1162 THE VOYAGE OF H.M.S. CHALLENGER. 



of the slightly convex front margin, and some setse at its apex ; the fourth joint a very 

 little longer than broad, with long feathered spines or setse at the apices; the fifth joint 

 as lono- as the third, resembling the fifth joint in the preceding pair, but longer, and its 

 finger having a longer nail. 



Fifth Perseopods. — The side-plates apparently smaller than in the preceding pair. 

 Branchial vesicles perhaps not present. The first joint a little longer and more pyriform 

 than in the fourth peraeopods, the front margin nearly straight ; the second joint longer 

 than broad ; the third, fourth, and fifth all longer than in the preceding pair, the fifth 

 having the hind margin convex and the front straight, instead of reversed as in the two 

 preceding pairs, the two margins, however, being nearly parallel ; the finger with the 

 upturned point in front. 



Pleopods. — The coupling spines small and slender, the apical and a second pair of 

 retroverted hooks being close together and sharp ; there do not appear to be any cleft 

 spines ; in the first pair the joints of the inner ramus are seven or eight in number, of the 

 outer nine, the first of the outer being much more expanded than that of the companion 

 ramus and fringed on the outer margin with many long feathered setse ; the other two 

 pairs were not observed with precision, but were successively smaller, as in the next 

 species. 



Uropods. — The peduncles of the first pair longer than the rami, with a few slender 

 spines along the distal half of the upper outer margin, the distal margin pectinate ; the 

 outer ramus longer than the inner, with eight or nine setiform spines within the slightly 

 curved outer margin, which is also bordered with rows of little tooth-like spines ; there is 

 a strong spine at the rounded pectinate apex ; the shorter inner ramus appears to have 

 both lateral margins smooth, the apex as in the outer ramus ; the peduncles of the 

 second pair do not reach so far as those of the first, but are longer than the single 

 ramus, of which the inner margin is smooth, nearly straight, the outer convex, fringed to 

 some extent like the outer ramus of the first pair, the apex blunt, not pectinate, carrying 

 a setiform spine ; the short broad peduncles of the third pair begin about on a level with 

 the apices of those of the other pairs and extend beyond the telson ; they have the inner 

 margin convex, carrying a setule, the outer tending to concave, armed with two setules ; 

 the ramus is minute, only just projecting beyond the peduncle, with two upturned sharp 

 spine-teeth and a little tooth behind each. 



The Telson is very short, broader than long, bilobed, with a girdle round the middle 

 of about fifty little spine-teeth. 



Length. — The specimen, in the position figured, measured, from the rostrum to the 

 back of the seventh peraeon-segment, a little over one-tenth of an inch. 



Locality. — The specimen, evidently a male, was obtained at Kerguelen Island, Station 

 149 H, off Cumberland Bay, Jan. 29, 1874 ; depth, 120 fathoms ; bottom, volcanic mud. 

 There are two other specimens in little cylindrical tubes of sand, one with the head aDd 



