242 Proceedings of tlce Royal Society of Victoria. 



Third Peraeopoda. — The posterior coxal lobe is much deeper 

 than the anterior one, and its inferior margin near the apex is 

 serrated and set with six stout spines. The basos is expanded, 

 its width equalling three-quarters of its length, the posterior 

 margin is irregularly and minutely serrated, and the anterior 

 margin is spinulose. The merus has spines at three places along 

 the front and hind margins. The carpus equals in length the 

 merus and ischium combined, and has spines at six places along 

 the anterior, and at three places along the posterior margin. 

 The propodus is of equal length to the carpus, and has spines at 

 seven places along the anterior, and at four places along the 

 posterior margin. The dactylus has already been described. 



Fourth and Fifth Peraeopoda. — These are partly broken in 

 my specimens. The coxal lobe of the fourth pair is deeply 

 produced and bears about six acute spines; that of the fifth pair 

 is normally narrow, broadly rounded behind and spinose. 



EXPLANATION OF PLATES. 



Plate XXXYL 

 Hyalella australis, n. sp. 



Plates XXXVIL and XXXVIII. 



Atyloides gabrieli, n. sp. 



Plate XXXIX. 

 Gammarus australis, n. sp. 



Plate XL. 

 XJnimelita spenceri, n. g. et n. sp. 



The following lettering is used in each of the plates to designate 

 the corresponding parts: — C. cephalon; Ms. mesosome; Mts. 

 metasome; Up. urosome; A^ superior antennae; A'^ inferior 

 antennae; U. anterior lip; L". posterior lip; m^ first maxillae; 

 m'". second maxillae; mp. maxillipeds; Gn\ and Gn'-. gnatho- 

 pods, first and second pairs; Pp'.-Pp". peraeopods, first to fifth 

 pairs; U'.-U\ uropods, first to third pairs; T. telson. 



