372 



CHAS. CHILTON. 



is indistinct, but apparently it does not reach down so far 

 as that of the second segment. The terminal segment of 

 the pleon is absent. 



The depth of the peraeon segments is about 4 mm. and 

 the greatest depth of the pleon 7 mm. 



Specimen 3, Fig. 3, b and b'. (Block 240, the smaller 

 impression, with counterpart on portion of Block 241), 



UAM^tb 



o 



(7 



Fig. 3. Phreatoicus wianamattensis, (No. 240 and 241] 

 b', its counterpart. X 5. 



b, impression, 



This specimen is rather smaller than specimen 1, the 

 total length of the impression being 13 mm. It shows part 

 of the third segment of the peraeon and segments 4, 5, 6 

 and 7, and the first five segments of the pleon, so that the 

 whole animal would probably have a total length of about 



