A FOSSIL ISOPOD OF THE FRESHWATER GENUS PHREATOICUS. . 377 



This specimen is also imperfect, but shows the four 

 anterior segments of the pleon, with the same structure as 

 in the other specimens. Two of the peraeopoda, apparently 

 the sixth and seventh, are fairly well preserved, especially 

 the terminal portion of the seventh, which shows the merus, 

 carpus and propod very distinctly, and of apparently the 

 same shape and proportions as in P. australis. 



Specimens 8 and 9, Fig. 8. (Block 239). 



n 



1 



Fig. 8. Phreatoicus wianamattensis, (No. 239a.). X 5. 



These specimens are very imperfect, but show distinctly 

 certain segments of the body, apparently the posterior 

 segments of the peraeon, with the basal joints of the 

 corresponding peraeopoda. 



In specimen 8 (fig. 8) apparently the last four or five 

 segments of the peraeon are represented, with indications 

 of the first two segments of the pleon. 



Specimen 9 shows two or three similar segments, but it 

 is impossible to say which they are. They look quite like 

 those shown in fig. 8, and I have therefore not given a 

 figure of them. 



Specimen 10, Fig. 9. (Block 239). 



' In this impression there is only a 



very small portion preserved, which 

 by itself would be probably quite 

 unrecognisable, but which, con- 

 Fig. 9. Phreatoicus wiana- sidered in connection with the other 

 mattensis, (No. 239c). x 5. specimens found near it, may per- 

 haps be taken to represent the fourth and fifth segment of 

 the pleon, with a portion of the sixth. 



