The Devonia7i Syston i?i Canada. — WJiiteaves. 223 
an entry in his notebook for August 20, 1843, published in the 
"Life of Logan" by Dr. Harrington, it is distinctly stated that 
the plants of these sandstones are "not Carboniferous." A 
few years later, in a communication to the meeting of the 
"British Association for the Advancement of Science" at Ips- 
wich, in 1851, Logan thus expresses himself: "None of the 
productive part of the New Brunswick coal measures reaches 
Canada, but there comes out from beneath it, on the Canadian 
side of the Bay Chaleurs, 3,000 feet of Carboniferous red sand- 
stones and conglomerates. These are succeeded by 7,000 
feet of Devonian sandstones, which rest upon 2,000 feet of 
Silurian rocks consisting of limestones and slates."* 
vSix of the species of fossil plants collected from the Gaspe 
sandstones by Logan in 1843 were described by Sir William 
Dawson : four (Psilophyton princeps, P. robustius, Lepidoden- 
dron gaspianum and Prototaxites logani) in the Quarterly 
Journal of the Geological Society of London for January, 
1859.1 ^^cl two (Cordaites angustifolia and Selaginites formos- 
us) in the "Canadian Naturalist and Geologist" for June, 1861. 
In the former of these papers the two remarkable genera 
Psilophyton and Prototaxites were first proposed and defined. 
Subsequently, however, in 1888, Sir William somewhat modi- 
fied his earlier descriptions of Prototaxites, and changed its 
generic name to Nematophyton.t Selaginites formosus was 
abandoned "as a vegetable species" by its author, in 1871, 
because additional material showed that the specimens upon 
which it was based are "probably fragments of some eurypter- 
oid crustacean, "§ as suggested by Mr. Salter. 
The supposed worm-tracks from the Gaspe sandstone be- 
tween Tar point and Douglastown, discovered by Logan in 
1843, were described and refigured by the writer, under the 
name Gyrichnites gaspensis, in the Transactions of the Royal 
Society of Canada for 1882. 
Logan's examinations of the Gaspe series of sandstones and 
limestones were supplemented by those of Murray on the 
*Report of the Twenty-first meeting, page 61. 
tVolume XV, p. 477. 
JThe Geological History of Plants, page 21; and Transactions of the 
Royal Society of Canada for 1888, sect. 4, pp 27-47. 
§Geological Society of Canada. The Fossil Plants of the Devonian 
and Upper Silurian formations of Canada, part i, page 65. 
