228 ME. A. O. WALKER ON SOME 



whicli has five teeth just below the rostrum, the second from the 

 rostrum being the largest ; rostrum horizontal, blunt, about one- 

 sixth the length of tbe carapace, with five small teeth on the 

 lower margin. 



!First pair of legs with seven teeth on the lower margin of the 

 first joint. Second pair with a large spine at the distal end of 

 the second, and two unequally long spines at the end of the 

 third joint. Third pair with an appendage on the second joint, 

 consisting of two parallel curved blades, twice as long as the 

 succeeding three joints. 



Length 8| mm. 



The above interesting species has a general resemblance to 

 Leucon, from which genus, however, it may be at once distin- 

 guished by the appendages on the fourth pair of legs in the 

 female and the third pair in the male. It was taken in the tow- 

 net, attached to the back of the trawl-net, on April 22, 12 miles 

 S.W. of Chicken Eock, 33 fathoms. 



Also noticed in the Tenth Annual Eeport of the Liverpool 

 Marine Biology Committee, and their Biological Station at Port 

 Erin (Isle of Man), p. 14 (1897). 



ISOPODA. 



Tribe Chelifeea. 



Fam. Apsetjdid^. 



Apsetjdes hibeei^tcus, n. sp. (PI. 17. figs. 2-2 <?; PL 18. 

 figs. 2 e, 2/.) 



Female. Eostrum triangular, blunt, and depressed at the point, 

 sulcate on the upper surface, without a spine at the point ; 

 margins nearly straight. Ocular lobes well developed; eyes 

 rather indistinct. Epistome provided with a strong spine. 



Perseon (mesosome) having the 1st segment rather narrower 

 than the cephalosome, with a strong tooth directed forwards on 

 the antero-lateral corner ; the dorsal plates of next four seg- 

 ments widely separated ; no spines on the ventral surface. 



Pleon (metasome) less than | the length of the whole animal, 

 about equal to that of the three preceding perseon-segments ; epi- 

 meral projections obliquely truncate at the ends. 



Telson about equal in length to the four preceding pleon- 

 . segments, widest in front. 



The last three perseon-segments, pleon, and limbs are densely 

 clothed with plumose hairs. 



