AGE OF THE LIGIillTlC DETERMINED BY ITS FLORA. 347 



The species described in the same report from the lower stage of the 

 Lignitic of Canada are fewer, and apparently represented by more imperfect 

 specimens. They are: — 



Equisctum Parlatorii, H., of the Miocene of Europe, a species to which 

 E. Haydenii of Carbon is closely allied. Its habitat is marked as Great 

 Valley. 



Lcmna scutata, sp. nov., abundant at the Bad Lands, and also at Point 

 of Rocks. 



Scirpus species, Bad Lands. 



Salix Eheana?,Ii. (Great Valley), species of the Miocene of Greenland. 



Sapindus affinis (Bad Lands), species of the Union group. 



Rha?nnus, an undescribed species (Great Valley), corresponding to Mio- 

 cene species of Europe and of the American Lignitic. 



^sculus antiquus, Trapa borealis, and a Carpolithes, three new species 

 described from obscure specimens from the same locality as that of Lemna, 

 the Bad Lands, west of Woody Mountain. These last plants represent a 

 lower geological division, which could not be recognized from the limited 

 number of species pertaining to it. But from the exposition as it is made 

 by Prof Dawson, it is clear that he had to refer the fossil plants of the 

 Canadian Lignitic to the Tertiary, and consequently the formations also; for, 

 indeed, this flora, as remarked already, has not any vegetable remains which, 

 by comparison, could be recognized as identical or even related to any Cre- 

 taceous species. 



Coming back to the other plants of Point of Rocks, for considering their 

 characters as an evidence of their age, by comparison with other groups of 

 floras than that of Canada, we find in the table four of them marked as 

 analogous to Cretaceous types. The first, Pistia corrugata, has merely a 

 generic relation to Pistia Mazelii, Sap. (ined.), lately found in the fresh-water 

 Upper Cretaceous of Fuveau, France. From the sketch kindly communi- 

 cated by the author, his species is very different in characters from that of 

 Point of Rocks, and therefore it merely evinces the possibility of a relation 

 between the age of the formations. The generic affinity, however, is worth 

 remarking, as it records the first appearance of the genus by two species which 

 represent it, one only on each continent. 



By the same degree of affinity, I have marked, in the Cretaceous column 

 of the table, Sequoia longifolla, also found at Black Buttcs, and Sequoia 



