A FOSSIL ISOPOD OF THE FRESHWATER GENUS PHREATOICUS. 379 



peduncle are indicated and the flagellum shows distinctly* 

 Apparently all seven segments of the peraeon are present* 

 with the basal joints of some of the peraeopods, but the 

 head and first peraeon segment are not clear. All six 

 segments of the pleon are represented, showing the pleural 

 portions as in specimens already described, the terminal 

 segment having a broadly conical point as in Specimen 5* 

 Below it the uropods are distinctly seen, both the right 

 and left uropods being shown owing to compression, the 

 left apparently above the right, and there are indications 

 of the two branches of each uropod. 



Specimen 12, Fig. 11. (Block 235). 



Fig. 11. Phreatoicus wianamattensis, (No. 2356). X 5. 

 (Counterpart of No. 2366.) 



This specimen shows clearly all the segments of the pleon, 

 including the terminal segment, which has the same shape 

 as in the other specimens. The first pleon segment is 

 distinct; it is not as deep as the second, and shows the 

 shape as already described in other specimens, perhaps 

 even more distinctly than in them. The basal joint of the 

 uropod is also clearly seen, and there are indications of the 

 two branches. 



Specimen 13, Fig. 12. (Block 235). 

 This specimen (near the margin of the block) shows clearly 

 the shape of the terminal segment, and below it the peduncle 

 and the two branches of the uropod. 



