174 LIVERPOOL BIOLOGICAL SOCIETY. 
Amphithopsis bicuspis, A. Boeck, Forhandl. ved de 
Skand. Naturf., 8 de Mode, 1860. 
Calliopius bidentatus, Norman, Nat. Hist. Trans. 
Northumberland and Durham, 1867 [not described]. 
McIntosh, Ann. and Mag. Nat. Hist., 4th ser., vol. xiv., 
p. 268. 
Non Pherusa bicuspis, Sp. Bate, Cat. Amph. Crust., 
Brit. Mus., 1862; and Sp. Bate and Westwood, Brit. Sess. 
Eyed Crust., 1863. 
Head furnished with a very small beak. Body elongate; 
epimera much smaller than in Pleustes pulchellus, Kr.; 
back rounded. First and second segments of the pleon 
having each a spine in the middle of the hinder margin. 
Lower hind angle of the third segment of the pleon 
curved upwards and acute. Antenne long. The hands 
of the first and second feet (gnathopods) large and oval, 
and armed along the edge with slender spines. The 
last pair of uropods having the inner branch more than 
twice as long as the peduncle. Telson elongate, oval. 
Length 6.5 mm.—Boeck, Skand. og Arkt. Amphipod., 
1876, p. 308. The upper antenne have the first joint of 
the peduncle as long as and much thicker than the two 
following. The flagellum is long and slender, and generally 
has the joints alternately red and white in lengths of five 
to nine joints. The first jomt is as long as the three 
following. The peduncle of the lower antenne is much 
longer than that of the upper, the first two joints together 
being about equal in length to the third, which is equal 
in length to but thicker than the fourth. The first and 
second gnathopods are almost exactly alike. In addition 
to the long spines (about five in number) with which the 
palms are armed, there are also some shorter spines and 
hairs ; all these appear to be arranged along the two edges 
of the groove in which the finger folds. The last pereiopods 
