260 



2i. Lituites convolans. 



25. Cyrtodonta canadensis. 



26. C. obtusa. 



27. C. huronensis. 



28. C. subtruncata. 



29. C subcarinata. 



30. Ambonycliia orbicularis. 



31. Modiolopsis treutonensis. 



32. M. modiolaris. 



33. M. meyeri. 



34. M. gesneii. 



35. Illfenus ovatus. 



36. I. milleri. 



37. Batbyurus extans. 



•38. Ceraurus pleurexantbenius. 

 Thirty-eight species and one variety. 



I think it is high lime that the attention of the club was called to 

 the fact that very little work worthy of mention has been done during 

 the past twenty years in Ottawa Trenton group paleontology. Looking 

 over Canadian scientific i)amphlets and periodicals I find but two 

 notable lists of Trenton fossils, one by Mr. J. F. Whiteaves, published 

 in the Canadion Naturalist for 1865, and the other Mr. Ami's list, 

 published in your Transactions No. 5. Mr. Whiteaves' list was of 66 

 species from the Trenton formation (excluding the Birdseye and Black 

 River) of the Island cf Montreal. Mr. Ami's list includes Ohazy, 

 Birdseye and Black River, Trenton, TJtica and two divisions of die 

 Post Tertiary. Omitting the Post Tertiary, and excluding varieties 

 where their species are also given, we find that Mr. Ami has given us 

 202 distinct species from the Cambro-Silurian rocks of this locality, as 

 follows : — 



Chazy 10 species. 



Birdseye and Black River 22 *' 



Trenton 1 54 " 



Utica 45 '• 



231 

 I-ess 10 marked doubtful and 19 names 

 repeated under two or more forma- 

 tions 29 " 



Total number of Cambro-Silurian species. 202 



