1915] PALAEOZOIC FOssiILS FROM HupsoN Bay. 35 
One fragment from a boulder at the mouth of the Shamattawa 
river consists of a fine grained, argillaceous limestone of light brownish 
colour. The substance of the included shells has entirely disappeared, 
but moulds are preserved of some organisms which have been so flattened 
that exact determination is impossible. The most abundant species 
is a large Gastropod, 30 to 35 mm. in diameter, referable with reasonable 
certainty to Liospira. Species probably belonging to Cymatonoia or 
Orthodesma occur, and Byssonychia or a closely allied genus is repre- 
sented by one impression. The specimen also shows the impression 
of a Cyrtoceras. These fossils indicate a Cincinnatian rather than a 
Mohawkian horizon. (No. 950 H.R. Royal Ontario Museum of Palae- 
ontology.) 
