500 Canadian Record of Science. 



1875. More recently, Schroeter had described specimens 

 from the Laramie of the Mackenzie Eiver. A considerable 

 number of specimens from ascertained horizons had now 

 been collected by the parties of the Geological Survey, 

 especially by Dr. G. M. Dawson, Mr. J. B. Tyrrell, and Mr. 

 T. C. Weston; and slices, prepared by the latter, had been 

 submitted to the writer. 



The present note on these might be considered as sup- 

 plementary to previous papers on the fossil plants of the 

 Western Cretaceous. The paper then proceeds to notice 

 the specimens in detail, and to refer them to their probable 

 genera, but as they may have belonged to species already 

 named and described by their leaves and fruits, he thought 

 it unnecessary to give specific names to the new forms, but 

 merely referred to the modern types represented by the 

 several specimens. In this way it appeared that a number 

 of genera of conifers, more especially Sequoia, Taxus, Salis- 

 burya and Thuja, were present, as well as woods allied to 

 Birch, Poplar, Hickory, Elm, and other familiar forms. 

 Appended to the paper were notices of additional species of 

 plants recently collected in the Belly Biver and Laramie 

 formations, and concluding remarks on the general bearing 

 of the subject, of which the following is a summary : 



While studying the specimens described in this paper, I 

 received the volume of the PalaBontographical Society for 

 1885, containing the conclusion of Mr. Starkie Gardner's 

 description of the Eocene Coniferse of England. The work 

 which he has been able to do in disentangling the nomen- 

 clature of these plants and fixing their geological age, is of 

 the greatest value, and shows how liable the palaeobotanist 

 is to fall into error in determining species from imperfect 

 specimens. Our American species no doubt require some 

 revision in this respect. 



I have also, while writing out the above notes for publi- 

 cation, received the paper of the same author on the Eocene 

 beds of Ardtun in Mull, and am fully confirmed thereby in 

 the opinion derived from the papers of the Duke of Argyll 

 and the late Prof. E. Eorbes, 1 that the Mull beds very 



1 Journal Geol. Socy. of London, Vol. VII. 



