EEPORT ON THE AMPHIPODA. 779 



The marsupial plates as long as the branchial vesicles, but much narrower. The first 

 joint not very wide, oblong-oval, with about a dozen small spines along the nearly 

 straight front margin, and seven or eight minute serrations on the hinder ; the third 

 joint is longer than the fourth, apically decurrent behind, and with a spine on the hind 

 margin ; the fourth joint has two small spines on the front margin ; the fifth joint 

 subequal in length to the third, has five small spines along the front margin ; the finger 

 is more than half its length. 



Fourth PersBopods. — The side-plates much narrower than the preceding pair, the 

 hind lobe rather deeper than the front. The branchial vesicles and the limb similar to 

 those of the third perseopods, but with the first, third and fifth joints larger. 



Fifth P('r«o/50f/s.— Side-plates small, broader than deep, not bilobed. The limb as 

 in the preceding pair, but with all the joints, except the second, longer, and the first 

 joint more oval. 



Pleopods. — The coupling spines are similar in structure to those of the preceding 

 species, but with the lateral teeth numbering only from two to three ; the cleft spine 

 single ; the joints of the rami about eight or nine in number. 



Uropods. — Peduncles of the first pair subeqi;al in length to the long narrow rami, 

 which have a few spines on the outer margin ; the outer ramus a little shorter than the 

 inner ; peduncles of the second pair not reaching so far as those of the first, about as long 

 as the inner ramus ; the outer ramus a good deal shorter than the inner ; the peduncles 

 of the third pair longer than the rami, the inner margin apically pointed and carrying a 

 few marginal spines, the longer ramus with five marginal sj)ines, the shorter and narrower 

 with only three. 



Telson reaching beyond the peduncles of the first uropods, not so long in proportion t(j 

 its breadth at the base as in Lcucothoe miersi, the minute apex microscopically tridentate. 



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

 rostrum to the apex of the third uropods, one-fifth of an inch. 



Xoca/%.— Station 168, off New Zealand, July 8, 1874; lat. 40° 28' S., long. 

 177° 43' E.; depth, 1100 fathoms; bottom, blue mud; bottom temperature, 37°'2. One 

 specimen, female. Trawled. 



Remark. — The specific name refers to the tridentate ajjex of the telson, but this is a 

 character difficult to observe and not one on which much stress can be laid. 



Leticothoe jiindersi , n. sp. (PI. XLVIIL). 



The first pleon-segment with the postero-lateral angles minutely pointed, but with 

 the hind margin bulging out beyond the points ; the second pleon-segment with the 

 angles pointed, not produced beyond the hind margins. 



