234 " Transactions. — Zoology. 



the first joint of the flagellum, which is multi-articulate, twice as long as 

 peduncle, with long setfe on its lower margin. Inferior antennae 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 setse ; 

 propodos ohlong, with a narrow base, furnished with four or five rows of 

 setse on the back ; dactylos slender, curved. Pereiopoda slender, subequal, 

 sparingly spinose ; ischium very short ; meros as long as carpus and pro- 

 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 antenna, 

 in the length of the inferior antennae, 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. Gammaeides. 

 Genus Leucothoe, Leach. 



Body long, compressed. Antennae simple, subequal. Maxillipeds sub- 

 pediform, unguiculate. Mandibles having an appendage. Four anterior 

 pairs of cox^e as deep as their respective segments. First pair of gnatho- 

 poda having the carpus inferiorily produced to the extremity of the 

 propodos ; propodos slender ; dactylos short : second pair having the carpus 

 inferiorly produced to half the length of the propodos ; propodos ovate ; 

 dactylos long. Pereiopoda subequal, slender. Posterior pair of pleopoda 

 having two long lanceolate rami. Telson single, squamiform. 



1. L. traillii, n. sp. 



PI. XVIII. , fig. 1. 



Body rather slender. Cephalon slightly produced between the bases of 

 the superior antennte. Eyes rounded, large. Superior antennae one-fourth 

 the length of the body ; first jonit 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 antennae arising at 

 some distance behind and below the superior, subequal with them, but more 

 slender ; peduncle slightly exceeding that of the superior ; flagellum about 



