UO NOTES ON THE AUSTRALIAN AMPHIPODA, 



L^MATOPHILUS HYSTRIX. 



Cyrtofhium hystrix, Haswell, Proc. Linn. Soc, N.S.W., Vol. 

 v., p. 104, pi. YII., fig. 3. 



In this remarkable little species there are only five segments in 

 the pleon and only five pairs of appendages. The antennae are 

 subequal and the superior pair have no appendage. 



Dexiocerella lobata. N. sp. 



(Plate XVIIL, figs. 6-8.) 



The first four segments are produced in the middle dorsal line 

 into elevations which have the appearance, when looked at laterally, 

 of rounded lobes. The superior antennae are as long as the head 

 and pereion ; the first joint of the pedunole is straight, nearly as 

 long as the head, the second is the longest and slender, the third 

 is rather shorter and narrower than the second ; the flagellum is a 

 little longer than the last segment of the peduncle, five-jointed ; 

 there is a short accessory appendage ; both peduncle and flagellum 

 are ornamented with delicate hairs. The inferior antennse are as 

 long as the body, stout, the third joint of the peduncle is short and 

 thick, the fourth three times as long, narrow proximally, broader 

 distally, slightly bent ; the fifth is considerably longer than the 

 fourth and a little narrower, also slightly curved ; the flagellum is 

 about half the length of the last segment of the peduncle, consisting 

 of three joints, the first long, the second scarcely a third of the 

 length of the first, the last rudimentary. The anterior gnathopoda 

 are scarcely to be distinguished from those of C. minutum. The 

 posterior gnathopoda are very large, the merus pi-oduced below 

 into a tooth-like process ; the propus is large, irregularly ovoid, 

 the greatest length not twice the greatest breadth, the palm defined 

 by a strong tooth, with, near the base of the dactyl us, a low denticu- 

 lated lobe and a conical tooth. The pereiopoda are lost. The 

 pleopoda and telson are as in D. dentata. The length, inclusive 

 of antennae, is three-tenths of an inch. 



