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



The First and Second Gnathopods with large hands and with large distally expanded 

 wrists. 



The Fourth Perasopods longer than the third, though similar in structure. 



The Fifth Perwopods much longer than, but not nearly double the length of, the 

 fourth. 



The generic name refers to the great likeness between this genus and (Ediceros of 

 Kr0yer ; but, not to speak of smaller differences in the mouth-organs and in proportions 

 of the perseopods, those in the gnathopods were too great to admit of the inclusion of the 

 new species in the older genus, without modifying the definitions of it given by Boeck 

 and by Schneider, which did not seem to be desirable. 



QiJdicei'oides rostrata, Stebbing {(Ediceroides conspicua, Pis. LX., LXL). 



1883. (Ediceropm rostrata, Stebbing, Ann. and Mag. Nat. Hist., ser. 5, vol. xi. p. 204. 



The rostrum long and somewhat arched, projecting well beyond the first, if not the 

 second, joint of the upper antennae, dorsally, laterally, and inferiorly carinate, the dorsal 

 carina, however, not like the other three running out to the little boat-shaped apex, but 

 descending rather abruptly into it ; the sides of the head are produced in large squarish 

 lobes, angled above and rounded below ; on either side the base of the rostrum and behind 

 it there is a depression, and another crossing the head near its hind margin. The pera3on 

 is stout, with rounded back, each of the first six segments having a transverse dorsal 

 depression ; the seventh, which is the longest, has a small median tubercle. The pleon is 

 compressed, each of its first four segments carrying a median tubercle of successively 

 greater length, forming a sort of carina, interrupted by a dorsal depression in the fourth 

 segment. The fifth and sixth pleon-segments are very short. The side-plates of the 

 perseon-segments and the lower margins of the first three pleon-segments are, as usual in 

 this family, fringed with setae. The whole animal appears to be covered with short down. 



Eyes wanting ; see Note on Willemoes Suhm, 1876 (p. 461). The " finely granulated 

 red pigment," of which Willemoes Suhm makes mention, occupies all the thickened part 

 of the rostrum, not descending into the boat-shaped apex ; in the specimens preserved in 

 spirits the proboscis and its granular contents were no longer bright red, but white like 

 the rest of the animal. It will be noticed that in the other two species assigned to this 

 genus eyes are present on the rostral prominence. 



Upper AntennsB not nearly reaching the end of the peduncle of the lower, the first 

 joint broadest at the base, as long as the two following joints united, carrying many ciha 

 and fine setse ; the second joint nearly twice as long as the third, both furnished like the 

 first ; flagellum of twenty-one joints, of which the upper, to the number of about twelve, 

 are thick, the remainder thin and longer, these latter having each a distal group of cilia, 

 while the thicker joints, at least in one specimen, might be described as bearded. 



