G. M. Thomson. — iSJotes on New Zealand Crustacea. 215 



mate much shorter, and together with the posterior (ultimate) pair, having 

 somewhat unequal rami. Length, 0-15 inch ; colour, brown, covered with 

 reddish-black round spots, chiefly on the pleon. 



Hab. Dredged in Dunedin harbour, 4-5 fathoms, on sandy bottom. 



Sub-fam. Gammarides. 



Genus Amphithonotus, Costa. 



(Brit. Mus. Cat. Amphip. Crust., p. 150.) 



Body not laterally compressed. Cephalon produced into a rostrum. 

 Antenna slender, without secondary appendage. Mandibles having an ap- 

 pendage. Squamiform plates to the maxillipeds not largely developed. 

 Gnathopoda similarly formed, subequal, having the carpi inferiorly pro- 

 duced. Pereiopoda subequal. Posterior pair of pleopoda double-branched. 

 Telson single, cleft at the apex. 



1. A. levis, G. M. Thomson (Ann. & Mag. N.H., ser. V., vol. IV., p. 330). 



Fig. 6. 



Animal quite smooth and not carinated on the back. Cephalon pro- 

 duced into a small falcate rostrum, which projects between the bases of the 

 antennae. Eyes large, subreniform. Superior aatennre slightly exceeding 

 the inferior, about half as long as the animal ; peduncle very short ; flagel- 

 lum long, slender, and multi-articulate. Peduncle of mferior antennse 

 longer than peduncle of superior. Appendage of the mandibles long, 

 middle joint exceeding the other two. Maxillipeds having the appendages 

 longer than their respective joints. Gnathopoda small, subequal, abun- 

 dantly ciliated ; propodos with a well-defined, nearly transverse, palm, 

 against which the dactylos impinges closely. Pereiopoda subequal, pos- 

 terior pair the longest. Pleopoda subequal ; rami lanceolate, those of the 

 penultimate and ante-penultimate pairs unequal in length. Telson tubular, 

 notched at the apex. Length -3 inch. 



Hab. Dredged in Dunedin harbour in 4-5 fathoms. 



Though agreeing closely in generic characters, this species is very dis- 

 tinct in appearance from A. echvardsii, as figured in the Brit. Mus. Cat., and 

 also apparently from A. sinniventris, Costa. 



* Genus Eusirus, Kroyer. 



(Brit. Mus. Cat., p. 154.)* 



" Cephalon not rostrated. Pereion and pleon compressed. Superior 

 antennae long and slender, having a secondary appendage ; inferior antennae 



* The species described by me, though too near E. cunpidatus, Kroyer, to be 

 separated from it except as a variety, differs from the generic character in the following 

 points : — The maxillipeds are certainly not unguiculate, the propodos being obtusely 

 pointed and densely clothed at the extremity with hairs, and the dactylos being obsolete ; 

 the cephalon also has a small rostrum. 



