THE HAMILTON ASSOCIATION. 23 



incomplete, and poorly represented in our cases. The late Professor 

 Nicholson does not seem to have been even as successful as our- 

 selves, since he merely figures in the Palaeontology of Ontario a little 

 over a dozen already known as Hudson River Characteristic Fossils. 



This able Palteontologist, intimately acquainted with the Lower 

 Silurians of Ohio, U. S. A., etc., arrived at an opinion which 

 the writer thinks hardly admits of dispute, viz : That the greater part 

 of our Cambro-Sil. limestone shingles along the lake shore of Ontario 

 originally came from Hudson River (Upper Bala Beds). In the 

 limestone shingle on the Beach at Hamilton, along the lake shore 

 as far as examined, the examination agreed with the same conclusion. 

 When quartered formerly at Toronto I got a considerable number of 

 specimens along the lake shore by wading into the water and exam- 

 ining not only the upper surface of shingle, but the lower also, turn- 

 ing over any likely looking flag or pebble. 



The catalogue of Drift Fossils, Hudson River formation, found 

 by Dr. Spence., F. G. S., on the old and new beaches, is incomplete, 

 although he names a few which apparently were not discovered in 

 Ontario by Dr. Nicholson. In addition to the few specimens I have 

 already mentioned, I think several others may be added to Professor 

 Spencer's list — Ambonychia Bellistriata (Hall), who gives it as 

 Trenton ; one found by writer at the Iroquois, and another at the 

 modern Beach by the late W. Turnbull, Murchisonia Bellicineta 

 (Hall), Strophomena Fluctuosa (Billings), (found at Anticosti also), 

 Bellerophon bilobata (Hall). There are three or four specimens of 

 a Nov. Gen. figured by Hall and Whitfield in the Palaeontology of 

 Ohio, viz. : Orthodesma Contracta, O. Curvata, O. Recta. I have 

 been unable to find any record of their occurrence in Canada. All 

 three, however, are found at the Iroquois Beach, and two in lake 

 shore shingle ; one (or more perhaps) was in Mr. Turnbull's collec- 

 tion from the modern Beach. Orthonota Parallela (Hall), according 

 to same authors, belongs to this new Genera. 



At the lake shore near Winona, recently I discovered the cast of a 

 dorsal valve of a Crania. I thought at first it might prove nearly allied 

 to C. L£elia(Hall), a Cincinnatti specimen, even although I remarked 

 the absence of radiatory Striae characteristic of the species, and also its 

 occurence in what I considered a Trenton limestone. On comparing 

 it subsequently with Dr. James Hall's figure and description, I saw I 



