416 EXPLANATION OF PLATES I. AND II. 



No. 15. 



There are two casts of a lanceolate penninerved leaf 

 having the aspect of a leaf of one of the Rhamneoe. In 

 the outline of the lamina, and the nervation, they closely 

 resemble a leaf of the common Alaternus, with the excep- 

 tion of being only slightly crenated instead of serrated. 

 The greatest breadth is a little below the middle, and the 

 base is somewhat fuller than the apex, which is acute. 

 The impressions are an inch and a half long. There is a 

 fulness scarcely amounting to wrinkling, of the minor 

 meshes. 



No. 16. 



Is the lower half of an oval leaf resembling that of a 

 willow, with a margin entire, or indented only by small 

 pits, which are probably the casts of minute marginal 

 glands. The base is obtuse, the apex unknown, and the 

 lamina flat and smooth, with a very slight prominence of 

 the principal veins. The transverse diameter is half an 

 inch. 



There are also various fragments of impressions of 

 ribbed grasses or carices. 



The group of plants seems to be such as one would 

 expect to flourish in the climate of Canada West, and 

 belongs perhaps to the meiocene epoch. 



