TESTACEA PROM THE PLEISTOCENE MARL OP MOWBRAY SWAMP. 
SUMMARY. 
1 . The sinistral molluscs generally referred to Physa, Isidora, 
and Aplexa, are here shown to belong to Bulinus, as 
already held by Prof. Tate, on account of the more or 
less entire character of the margin of the mantle, and 
the structure of the lingual teeth which closely approach 
those of Planorbis. 
2. Two species of ostracoda are newly recorded from Tas- 
mania. One of these is an entirely new species, and 
extremely interesting in view of the occurrence of 
a closely related form in Europe, found similarly in 
Pleistocene deposits. This opens up a question 
regarding the transportation of lacustrine or fluviatile 
organisms within moderately recent geological time. 
3. The conclusion as to the age of the Mowbray Swamp 
deposit is significant, for it shows that the first mar- 
supial associated with these remains cannot date very 
far back in Pleistocene times, as seen in the com- 
paratively fresh condition of some of the mollusca 
and the ostracoda, many of which have their original 
colour markings still preserved. This evidence gives 
further support to Dr. Noetling’s previously recorded 
conclusions, based on. an examination of the mollusca 
alone. 
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