50 THE HAMILTON ASSOCIATION. 



case containing characteristic organic remains from lower Silurian 

 drift, etc, I placed valves of a large Modiolopsis. On comparing it 

 with " M. gesnere " Billings (which I thought it might be), it was 

 found to differ in some small matters, and on comparing it with 

 others I found the divergence still wider. It may be a new species, 

 or at least new to Canada. An Orthoceras, or rather a fragment of 

 one, was discovered also at Winona, which, if not new, must be 

 very rare in the lake shore drift. In Dr. Nicholson's work, 

 " Palaeontology in Ontario," he informs his readers that he recog- 

 nized " the Endoceras of Hall " by the cross striation of the shell. 

 That is not charcteristic solely of the Cephalopod. The Winona 

 one is marked in the same way, but the striae are closer. Orthoceras 

 Janiesi is similarly ornamented. 



A specimen of Bucania (Bellerophon) expansa Hall (Trenton) 

 was found and placed in the Museum. This lower Silurian Gaster- 

 opod is very rare in our local drift between Hamilton and Grimsby. 

 The greater part of the shingle along the lake shore was derived 

 from the Upper Hudson River (Bala) beds ; this may account for 

 it. Also a wedge-shaped valve of a Lamellibranch (Lyrodesma post- 

 striata), probably, the posterior striation not well dis- 

 played, so one cannot be positive regarding it. A " Cypricardites " 

 (Lyn. Cyrtodonto) nearly allied, if not identical, with one described 

 by Billings as occurring in Hudson River beds and in Anticosti, was 

 also obtained, but in poor preservation. Indeed it was difificult to 

 extract any limestone fossils at all at Winona, and I had to regret 

 seeing two or more fine specimens, new to me, coming from the 

 matrix as mere fragments, impossible to restore for description. 

 One, an Orthoceras, closely reticulated, had a fragment of the shell 

 adhering to the septae. 



BELLEROPHON EXPANSUS. 



This well marked keeled Gasteropod (whose name. Miller states, 

 was pre-occupied by Sowerby) seems rare in the drift of Ontario, 

 and is not named as occurring in " The Trenton " or " Hudson 

 River" rock series of the Province, by Nicholson. Another mem- 

 ber of this family group which, perhaps, may be the Bellerophon 

 bilobata of Sowerby, was found at Winona. (Without the originals 

 for comparison, it would be rash positively to name specimens solely 

 from description.) 



