382 CHAS. CHILTON. 



are compared with the figures of the fossil specimens given 

 above, which have been drawn by my assistant, Miss 

 Herriott, as accurately as possible to represent the actual 

 impressions, it will, I think, also be evident that the fossil 

 species comes near to P. australis itself, a species which 

 again is very similar in general appearance to P. capensis 

 irom South Africa. 



It may, therefore, be classified and described as follows: — 



Order ISOPODA Latreille 1817. 



Tribe or Suborder Phreatoicidea Stebbing 1893. 



Family Phreatoicidae Chilton 1891. 



Genus Phreatoicus Chilton 1883. 



Phreatoicus tvianamattensis sp. no v. 



Specific Diagnosis. — Similar in general appearance to P. 

 australis Chilton. Body apparently smooth and not sculp- 

 tured or tuberculated. Peraeon segments deeper than long, 

 but not more than two-thirds the depth of the pleon. All 

 the pleon segments with pleural portions much produced 

 downwards, that of the first reaching further down than 

 the last segment of the peraeon, but not so far as the second 

 pleon segment; segments 2, 3 and 4 about subequal in 

 length with depth gradually increasing posteriorly; fifth 

 segment only slightly longer than the fourth; terminal 

 segment conical in side view and ending in a subacute point 

 with curving sides, the terminal process not being sharply 

 defined from the general outline of the segment. 



Peraeopoda similar to those of P. australis; (the first 

 missing), second, third and fourth directed forwards, sub- 

 equal in length, with basal joints expanded, merus produced 

 at antero-distal angle about half-way along the carpus ; 

 the fifth, sixth and seventh directed backwards, fifth about 

 as long as the fourth, sixth longer than the fifth, and seventh 



