No. 6.] DAWSOxX — PALAEOZOIC FLORAS OF CANADA. 375 



Lepidodtiudron tef.ragonimi, Sternberg. 

 L. ohovatum, Sternb. 

 L. aculeatinn, Sternb. 

 L. dichotomum, Sternb. 



These species are comparatively rare, and the specimens 

 are too imperfect to render their identification certain, 



Cyclopterls (^Anei mites) Acadica, Dn. — A very charac- 

 teristic fern, allied in the form of its fronds to C. 

 tenui.foUa of Goeppert, to C. nana, of Eichwald, and 

 to Adianfitcs antiquus of Stur. Its fructification, 

 however, is nearer that of Aneimia than to that of 

 Adlantam. 



Ferns of the genera Cardiopteris and Hymenophyllites 

 also occur, though rarely. 



Ptilopliyton plumula, Dn. — This is the latest appearance 

 of this Erian iienus, which also occurs in the Lower 

 Carboniferous of Europe and of the United States. 



Cordaites horasai folia, Brongt. 



On the whole, this small flora is markedly distinct from that 

 of the Millstone Grit and true Coal formation, from which it is 

 separated by the great length of time required for the deposition 

 of the marine limestones and their associated beds, in which no 

 land plants have been found ; nor is this gap filled up by the con- 

 glomerates and coarse arenaceous beds which, as I have explained 

 in Acadian Geology, in some localities, take the place of the lime- 

 stones. 



In my Report on the Plants of the Millstone Grit and Lower 

 Carboniferous, I have referred at length to their relation to the 

 foreign beds of similar age, and which are known to geologists 

 by a number of local names. 



2. EMAN FLORA. 



(1.) Upper Erian Srd)-flora : — 



This corresponds to the Catskill and Chemung of the New 

 York series, and to the L^pper Devonian of Europe. 



The flora of this formation, which consists mostly of sand- 

 stones, is not rich. Its most distinctive species on both sides of 

 the Atlantic seem to be the ferns of the genus Archaeopteris, 

 along with species referred to the genus Cyclopteris, but which, 



