58 THE HAMILTON ASSOCIATION. 



On referring to Dr, Nicholson's " Palaeontology of Ontario,'' the 

 chain pore coral is not recorded as having come under observation 

 except in Niagara limestones. We may therefore add it to the 

 Clinton organisms recently given as Hamilton, Ontario, fossils. We 

 have much to learn yet regarding the Palceontology of the district, 

 and the following fact is well calculated to stimulate further research : 

 In a late communication from the able Palaeontologist of the Do- 

 minion Geological Survey, in acknowledging the receipt of a small 

 collection of fossils from Hamilton, he mentions it would be desir- 

 able to secure for the National Survey office a specimen of a Cephal- 

 opoda now in the British Museum, named Trocholites Planor 

 Biformis, said to be obtained from Trenton (^Conrad) limestones at 

 Montmorenci, and three were obtained, adds Prof. Whiteaves, from 

 near Grimsby, Ont., by a gentleman from Philadelphia, Mr. Ashmead. 

 The professor indicates the drift on the lake shore at Winona and 

 Grimsby as likely to furnish the specimens required. I think, from 

 the description given, we may safely place it with other drift fossils 

 found here. 



During the past summer, while at Winona, on breaking up an 

 exceedingly hard limestone flag, I discovered a few Trenton fossils 

 inside, together with what I then supposed to be a crushed Pkuroto- 

 marta, which I failed to extract. The receipt of Prof Whiteaves' 

 communication leads me to recall a Barton Cephalopod, Trochoceras 

 Desplamense (M. Chesney), now in the Redpath Museum at Mon- 

 treal. Probably it bore a nearer resemblance to that than to the 

 Gasteropods. The hoop-like form is preserved or indicated in both 

 names — Trocholites and Trochoceras. The imperfect state of preser- 

 vation may at least be accountable to some extent for the erroneous 

 view at one time entertained. However, I feel satisfied that this, as 

 well as other rare Cambro-silurian fossils, may be yet extracted from 

 the lake shore shingle at Winona and Grimsby, while many of the 

 upper Hudson River ones there, already known, may be found in 

 better preservation than in the portions of the Ancient Lake Iroquois 

 Beach, which recent improvements have placed already beyond the 

 pale of investigation. Yearly we find the field contracted, but out- 

 side the city itself there remains to us still a wide extent of country 

 opened up to us by the kind and considerate act of the T., H. & B. 

 Railway authorities. To a certain extent it may be looked upon as 



