98 NOTES ON THE AUSTRALIAN AMPHIPODA, 



This species would seem to be subject to a considerable amount, 

 of variation. A specimen from Port Denison resembles the original 

 specimen from Port Jackson in the proportions of the body and of 

 the coxJB, in the pleopoda and the telson and the gnathopoda ; it is 

 distinguished from the latter by the greater length of the superior 

 antennae, which are as long as the head and first three segments, 

 and the flagellum of which consists of fifteen narrow articuli ; and 

 also by the form of the basal joints of the fifth pair of pereiopods 

 (fig. 10.) The lower antennae are broken. 



Another specimen (tigs. 11-16) from Port Jackson, resembles 

 the first in all points, except that the basal joint of the third pair 

 of pereiopoda is of a slightly different shape. 



In a specimen from Port Stephens, the superior antennse are as 

 long as the head and first four segments, and its flagellum consists 

 of about twenty segments. The inferior anlennte are considerably 

 longer, being longer than the head and pereion of the animal ; the 

 peduncle is very long and slender, equalling in length the whole of 

 the superior antennae. The basal joint of the last pair of pereiopods 

 differs a little in from that of either of the other specimens. 



In the Port Stephens and Port Denison specimens, the third 

 pair of pereiopoda terminate in a hair-like spine, which represents 

 the terminal joint, while in the Port Jackson specimen there is a 

 distinct, though small dactylus. 



VII. Lysianassa and Anonyx. 

 (Plate XII., figs. 1-6.) 



The species named by me Lysianassa nitens is better placed in 

 the nearly related genus Anonyx, the anterior gnathopoda having 

 a feebly developed, almost transverse palm (pi. XII., figs. 1 and 2) 

 which gives them a sub-cheliform character. The telson is deeply 

 cleft. 



The nearest relative of this species would seem to be Anonyx 

 Edimrdsii of Kroyer, the principal points of distinction apparently 

 being the greater number of joints (ten) in the flagellum of the 

 superior antennte of the present species, the broader form of the 

 propus of the posterior gnathopod, and its stronger dactylus. 



