36 THE HAMILTON ASSOCIATION. 
Canada, formerly in the Corniferous quarries and Devonian drift, he 
believes no specimen ever came under observation there. Slabs 
containing Leferdi/ia require careful examination, as we may expect 
to find them there. 
The oldest rock in which Cypridina first appears, remarks 
Professor T. R. Jones, in unmistakeable form, is probably of Lower 
Silurian (Ordovician) age as far as can be determined. 
In Europe a member of the group occurs in the Upper Silurians. 
The peculiar beak, the notch and size, as figured by Professor T. R. 
Jones, are so characteristic that the family cannot well be mistaken 
for Lepferditia. ‘This minute Crustacean is represented by two or 
more distinct species in the Cambro-Silurian drift along the lake 
shore, between Winona and Grimsby, as well as at the Burlington 
Heights, near the railway bridge. The naked eye shows the dis- 
tinction. In some instances you may remark when you split the 
slab the interior holds a number of specimens differing in size. 
These may probably represent various stages of growth of the 
little Crustacean. In other cases the beach drift shingle presents 
others equally numerous, all alike in size and appearance. Single 
individuals are’ seldom discovered. Without a good magnifying 
glass and the originals, or correct figures, I fancy it would be rather 
difficult to name the numerous varieties of the Canadian examples 
of Professor T. R. Jones, F. C. S. 
An old friend and correspondent of mine, Professor Chapman, 
of the Toronto University, calling the attention of the class he was 
instructing there formerly, pointed out the near resemblance the 
minute bivalve Crustacean bore to a grain of wheat. I have often 
noticed since then how appropriate was his illustration regarding 
both size and general appearance ; some are as large as the ones we 
see produced under favorable conditions on rich virgin soil, while 
others hardly attain the dimensions of a grain of barley. The Sec- 
tion may think the writer has dwelt too long on this particular 
portion of paleontology. The fact is one remarks a general tendency 
to neglect minute fossils. How many of us, for instance, would 
have noticed the microscopic teeth discovered by Professor G. J. 
Hinde, of the Toronto University, in our own neighborhood. I am 
not aware whether the Cozodonts found here were ever analyzed, 
but the only one I collected was glistening phosphatic, and the 
