234 Transactions.—Z oology. 
the first joint of the flagellum, which is multi-articulate, twice as long as 
peduncle, with long sete on its lower margin. Inferior antenne rather 
shorter than superior ; first joint of peduncle very short, second and third 
long and slender, flagellum slightly longer than peduncle, sparingly setose. 
Gnathopoda similar, second pair rather the longest, with numerous sete ; 
propodos oblong, with a narrow base, furnished with four or five rows of 
sete on the back; dactylos slender, curved. Pereiopoda slender, subequal, 
sparingly spinose ; ischium very short; meros as long as carpus and a 
podos together ; latter with a transverse palm, which has a long tooth in 
the middle, and two or three shorter ones at the point of impingement of 
the curved dactylos. Telson acute, each division bearing six short spines 
on its outer margin, and a small tooth near its extremity. 
Colour yellowish. Length 0:3 inch. ; 
Hab. Dredged in Paterson Inlet, in about 10 fathoms. 
This species is very near P. tenuipes, Haswell, an Australian form, but 
differs in having over twenty joints in the flagella of both pairs of antenn®, 
in the length of the inferior antenne, and in the spinous palms of the 
pereiopoda. It is questionable whether such characters are sufficient to 
establish the specific rank of the differing forms, but the relative values of 
varying parts is not yet well understood in the Amphipoda, nor are sexual 
differences and those due to the age of the specimens duly taken into con 
sideration. 
Sub-fam. GammaRIpEs. 
Genus Leucothoe, Leach. 
Body long, compressed. Antenne simple, subequal. Maxillipeds sub- 
having two long lanceolate rami. Telson single, squamiform. 
1. L. traillii, n. sp. 
Pl. XVIIL, fig. 1. 
Body rather slender. Cephalon slightly produced between the bases ° 
the superior antenna. Eyes rounded, large. Superior antenn® one-fourth 
the length of the body ; first joint of the peduncle stout ; second subequal 
with it, but slender; third very short, flagellum few-jointed (about 4?) 
shorter than the basal joint of the peduncle. Inferior antennw arising * 
some distance behind and below the superior, subequal with them, but ee 
slender ; peduncle slightly exceeding that of the superior ; flagellum a 
