REPORT ON THE AMPHIPODA. 1219 



third pair, had numerous marginal spines ; the coupliug spines are long and slender, with 

 a sharp apical pair of retroverted hooks, another slender pair just helow, and a little 

 further down two more hooks unsymmetrically placed ; the cleft spines were observed to 

 be five in a series on the first pair, four on the third, with long unequal arms, the inner 

 margin of the longer arm distinctly serrate ; the joints of the rami number from twelve 

 to fourteen ; the outer ramus is perhaps slightly the longer. 



The Telson is long and narrow, deeply cleft, the outer lateral margins converging, but 

 the apices being broken it could not be determined what acuteness was attained. 



The Uropods were all broken. 



Length. — The specimen, in the position figured, measured, in a straight line from the 

 rostrum to the extremity of the broken telson, three-tenths of an inch. 



Locality. — Station 149h, off Cumberland Bay, Kerguelen Island, January 29, 1874; 

 depth, 127 fathoms ; bottom, volcanic mud. Two specimens. One of the specimens 

 was certainly a female, as the marsupial plates were present. From this the figures 

 marked A in the Plate were taken ; the remainder from the other specimen. 



Remarks. — The specific name refers to the ornamentation of the pleon. 



In the imperfect state of the specimens the genus must remain to a certain extent 

 doubtful, but there is sufficient likeness between this species, so far as it can be made out, 

 and Hela monstrosa, Boeck, to justify their being, at least provisionally, placed side 

 by side. Boeck says of his species that the mandibular palp is short, and that the 

 spine-row consists of two spines. 



Family Lysianassid^e (see p. 60G). 

 Genus Kerguelenia. n. gen. 



Mandibles with the long three-jointed palp attached to the extreme front of the 

 trunk ; cutting plates, spine-row, and molar tubercle wanting. 



First MaxillsB. — The inner plate apparently rudimentary or wanting ; the outer 

 plate carrying five short spines ; the palp broad, two-jointed. t 



Maxillipeds. — The inner and outer plates small, the palp four-jointed, very long and 

 slender. 



Lower Antennas. — The third joint of the peduncle as long as the fourth. 



First and Second Gnathopods slender, having the second joint and wrist elongate ; 

 the first gnathopods neither chelate nor subchelate ; the second gnathopods minutely 

 chelate. 



The Third Perseopods with the first joint scarcely expanded ; the Fourth and 

 Fifth Perasopods with that joint expanded widely. 



