AMPHIPODA. 283 



wrist, is very setose; the dactylus reaches a little beyond the spine and is not 

 serrate (fig. 41. gn. 2 ? ). 



In the young male the side-plates are oblong, about twice as wide as deep, the 

 angles rounded ; 1st joint very stout (width to length as 3 : 5) and longer than the 

 next 3, a number of long setse on the outer side ; wrist short and triangular ; hand 

 subovate, margins to the palmar angle subparallel ; palm very oblique, uneven, 

 defined by a small blunt tooth, and occupying nearly half of the hind margin, which 

 is setose ; the front margin is naked ; the dactylus reaches to the palmar tooth and is 

 not serrate (fig. 41. gn.- c? jr.). 



In the adult male the anterior angle of the side-plates is less rounded. The palm 

 of the hand is deeply sculptured with a double tubercle in the middle. The dactylus 

 has an obtuse tooth in the middle of the inner side (fig. 41. gn. 2 S adult). 



First and 2nd peraeopods : 1st joint rather longer than and twice as wide as the 

 next 2 ; 3rd joint much longer than the 4th and rather longer than the 5th, which 

 tapers to the base of the dactylus. The whole very sparsely setose. 



Third perasopods much shorter than the 4th, the 1st joint wide-oval with smooth 

 margins ; 3rd and 4th much wider, but together scarcely longer than the 5th, on 

 which there is a row of spines. 



Fourth and 5th peraeopods like the 3rd, but longer ; the 3rd pair reaches the 

 4th joint of the 4th pair, and the 4th pair to the same joint of the 5th. 



The uropods are subequal in extent, the peduncles of the 1st and 2nd subequal to 

 the rami, with a row of spines on the outer margin ; rami also spinous. The 3i*d pair 

 have the peduncle considerably longer than the ramij of which the inner is the shorter 

 and pointed with 3 small spines on the outer margin and a terminal spine ; the outer 

 has a short spine on the upper side near the middle, with 3 or 4 short and 2 long 

 spines on the tip (fig. 41. up. 3 ). 



Telson as in G. erytlirophtlialmus (Lillje.). 



Length 6 millims. 



Ckeiriphotis, n. gen. 



Body very slender, scarcely compressed laterally ; side-plates very small. 



Head slightly produced in front, ocular lobes more so, angular or cuspidate. 



Upper and lower antennae subequal, the latter stronger ; appendage well developed. 



Mandibles with the palp long, 2nd and 3rd joints subequal, the whole as in 

 Gamma/ropsis. 



Second gnathopods of moderate size in the female, but immensely developed and 

 peculiarly formed in the male ; urus small ; the 3rd uropods with the outer ramus 

 very short, without a terminal joint, and the inner rudimentary. 



This o-enus is nearly allied to Microprotopus, from which it differs chiefly in the 

 smallness of the side-plates. 



2 o 2 



