98 THE ROYAL SOCIETY OF CANADA 
first of these is the true Dadoxylon ouangondianum of Sir William, while 
to the second kind may pertain the trunk figured and described by 
Professor Penhallow as Cordaites Ouangondianum. Professor Penhallow 
says that his species had no rings of growth.’ Outside of these 
two species we know of no Silurian plants in New Brunswick which 
can be referred to an Upland Flora. 
While these views on the ecological distribution of the Silurian 
plants are only tentative, they may serve to call the attention of 
naturalists to the need of a more extended field study of the ancient 
floras in America. 
Below we give a rough classification of the Silurian species according 
to habit so far as an opinion can be gathered from their conditions of 
entombment. 
MARITIME FLORA. 
Himantophyton Arthrosigma 
Psilophyton (?) and other species, not as yet determined. 
FLUVIAL FLORA 
Asterocalamites Ramicalamus 
Calamites Lepidocalamus 
Asterophyllites Johannophyton 
Annularia Ginkgophyton 
Sigillaria Pseudobaiera 
Stigmaria Psilophyton ? 
*Cordaites 
DELTAIC FLORA 
Asterocalamites Aneimites 
Calamites Neuropteris 
Sphenophyllum Megalopteris 
Asterophyllites Odontopteris 
Annularia Alethopteris 
Cordaites Pecopteris 
Antholithes Sphenopteris 
Johannophyton Hymenophyllites 
Psilophyton Cardiocarpon 
Carpolithes Trigonocarpon 


* Notes on North American species of Dadoxylon, p. 67, Montreal, 1901. 
* Determined from the leaves 
