2G Proceedings of the Royal Society of Victoria. 



and affinities,^ and, after enumerating the special resemblances to 

 the Amphipoda, says that "an examination of them shows that 

 none is of any particular importance in its bearing on the 

 systematic position of the genus, "^ and further he says '■'■ Phrea- 

 toiats occupies a fairly central position among the Isopoda, 

 retaining to a greater extent than any others the typical charac- 

 ters of the Isopoda.'"* 



Of the genus Phreatoiais, three species have been described, 

 two blind forms from subterranean waters in New Zealand, and 

 one, P. australis, Chilton, with functioning eyes, from the summit 

 of Mount Kosciusko, New South Wales, which has also been 

 identified by Mr. G. M. Thomson, from Mount Wellington, 

 Tasmania.^ Two other allied genera have been determined, viz., 

 Phreaioicopsis, Spencer and Hall, and Phreatoicoides, niihi. 



Phreatoicus shephardi, sp. n. 



(PL III., Figs. 1-10). 



Specific Description. — Male (Fig. 1). Body somewhat stout, 

 with few short setae scattered over surface. Eyes not formed. 

 First hve segments of pleon with pleura produced inferiorly, 

 rounded below, their inferior margins thickly fringed with long 

 setae, fewer and shorter ones extending along posterior margins. 

 Inferior margins of terminal segment bearing six large curved 

 simple spines, increasing in size distally, and eight liner simple 

 spinules near to the base of the uropods. iVIai'gins above uropods 

 rounded, and bearing one large and five small spines. Projection 

 at the extremity of the telson very slightly pi'oduced, and tipped 

 by one large median spine, and two smaller lateral ones ; also a 

 few long setae. 



Upper antennae not reaching to the extremity of the peduncle 

 of the lower, peduncle of three joints, flagellum of se^■en joints. 

 Lower antennae (length unknown), peduncle as long as the 

 longest axis through cephalon ; first two joints subequal, trans- 

 verse, third as long as first two combined, fourth slightly longer 



1 Trans. Linneati Soc. London, Zoology, vol. vi., part i. 



2 Loc. cit., paire 205. 



3 Loc. cit., page 209. 



i Proc. Roy. Soc. Tasmania, 1892, p. 32. 



