134 Proceedings of the Royal Society of Victoria. 



The propodos is subrectangular, of equal length to, but narrower 

 than the carpus. About half the distance along the posterior 

 margin there are two long spines, pointing distally ; the antero- 

 distal angle is tufted with long setae, and the anterior margin 

 sparsely setose. 



The dactylos is short, slightly curved hind ward, and ends in a 

 strong pointed tooth ; the posterior concave margin also bears a 

 stout tooth, and the anterior margin is sparsely setose. The 

 fourth pereiopod is not modified to form a clasping organ as in 

 Phreatoicus. 



The Fifth, Sixth, and Seventh Pereiopods. — The fifth, sixth, and 

 seventh pereiopods are each similar in form to one another, but 

 each is longer, and proportionately larger in all parts, than the 

 immediately preceding one. The fifth is of equal length to the 

 fourth, and the seventh is about one third longer than the first. 

 (Fig. 12, drawn on a smaller scale than the first, illustrates the 

 seventh, with the inner side uppermost). They each fit into a 

 triangular emargination at the posterior limit of each segment, 

 and are reversed in the manner of articulation to the preceding 

 four appendages. Their appearance is so much like those of P. 

 australis that a detailed description of them is unnessary. In 

 marked contradistinction the setse of the present species is some- 

 what longer but not so numerous, and the terminal joint is not 

 toothed. 



The Pleopods. — The pleopods are all branchial in function, and 

 the second pair, in the males, possess each a " penial filament " 

 (Fig. 13). They are large and well developed, and hang from the 

 ventral surface free from an operculum or any protective process. 

 In fundamental features they are like Phreatoicus except in not 

 having a distinct pi-ocess in the third, fourth, and fifth pairs, 

 thought by Chilton to be an epipodite, and also shown by Spencer 

 and Hall to exist in Phreatoicopsis ; and further-, they are not 

 protected by an extended pleura, as in the recorded species of 

 the two mentioned genera. Each succeeding pair slightly 

 diminishes in length hindward. The endopodite is in no case 

 setose, and there are no plumose setse on the exopodite as in 

 Phreatoicus. 



First pair of Pleopods — In the first pleopod the protopodite is 

 subrectangular in outline, with a tuft of long stiff seta^ on the 



