HYPERfA OBLTVIA. 17 



lateral wall. The superior pair of antennae are about 

 as long as the head is deep. The peduncle is short ; the 

 flagellum stout at the base, gradually tapering to the 

 apex, and is marked with a few imperfectly-defined rings. 

 The inferior antennae are more slender than the superior, 

 a little longer, and terminate in a multiarticulate 

 flagellum. The hands can scarcely be described as sub- 

 chelate, although they possess a tendency in the direction 

 common to most animals in the division. The third and 

 fourth pairs of legs are long, and have the wrists thicker 

 than any other joint ; the hands are long and slender 

 and tipped with sharp fingers. The three succeeding 

 pairs are also uniform in shape, and nearly of equal 

 length, the last being rather the shortest ; these have 

 the sixth joint remarkably long, and have the anterior 

 margin of each with the distal half fringed with short, 

 straight, evenly-planted cilia, and a few scattered longer 

 ones. The caudal appendages are rather long and 

 slender. 



The colour of this species, if we can trust to that of 

 an animal that has been dead a short time, appears of a 

 light straw, having the back starred with a few spots of 

 black pigment. 



We have frequently doubted whether this species 

 strictly belonged to the present genus. But finding that 

 it agreed very closely with H. trigona, of Dana, from 

 Cape Horn, we have considered it desirable that it 

 should remain therein for the present. The form of the 

 first two pairs of walking legs differ from the more 

 typical species. The two succeeding pairs of legs in 

 their length and armature suggest a relationship to the 

 genus Cyllopus, which is also supported by the form of 

 the inferior pair of antennae, but from that genus this 



VOL. ri. c 



