22 SIR J. W. DAWSON ON THE FOSSIL PLANTS 
have compared this plant with recent specimens from the Himalayas in the collection of 
Mr. D. A. P. Watt of Montreal, and find no difference. The genus is not now known to 
be represented in America. Ferns of this type are not uncommon in the early Tertiary of 
other countries, but being known only by barren fronds have usually been referred to the 
genus Sphenopteris. Sphenopteris Brunstrandi of Heer, from the so-called Miocene of Spitz- 
bergen is one of these species, and also S. eocenica of Ettingshausen. 
In regard to distribution, this plant affords a curious contrast to the last. It is now 
confined to Asia, whereas in the Laramie period it was associated in America with our 
common Onoclea. It has not been found in the Laramie of the United States. 
Collected by G. M. D. ; 
2. Equisetacee. 
EQUISETUM, Sp. 
In the Upper Laramie of Porcupine Creek, are many fragments of stems of an Equis- 
etum about a quarter of an inch in diameter, and with twenty to thirty ribs. It is near 
to E. arcticum of Heer, from Spitzbergen, and to E. Wyomingense of Lesquereux, but cannot 
be certainly identified. 
Collected by G. M. D. 
EQUISETUM, (Roots and bulblets). (Plate I, Fig. 2). 
Physagenia Parlatorii, Report of 49th Parallel, p. 329, Pl. XVI, Figs. 3 and 4. 
There can be little doubt that the plants designated by Heer, Physagenia, are really 
roots and tubers of Equisetum. The specimens are from the Upper Laramie of Great 
Valley (lat. 49°, long. 105°); but these objects occur in this formation in various places 
in Canada and the United States. 
Collected by G. M. D. 
3. Conifere. 
THUJA INTERRUPTA, Newberry. (Plate I, Fig. 3). 
Newberry, loc. cit. p. 42. Dawson, Report on 49th Parallel, Ap. A. 
This species is, according to Newberry, very characteristic of the Fort Union group, 
and is equally so of the Upper Laramie at Porcupine Creek. One of the specimens shows 
scales of the cone, which resemble those of 7. gigantea of the west coast, while the foliage 
is nearer to that of 2! occidentalis, the common “cedar” or arbor-vitæ of Canada. Wood, 
having the structure of that of Thuja, is found in the lignites associated with these beds, 
and probably belongs to this species. 
Collected by G. M. D. 
SEQUOIA NORDENSKIOLDI, Heer. 
Heer, Flora Foss. Arctica (Spitzbergen.) 
The common species of Sequoia found at Porcupine Creek and Great Valley seems 
referable to this species, and it is still more abundant in the same Upper Laramie formation 
at Red Deer River. Specimens of the same species from the Fort Union group, presented 
to me by Dr. Newberry, are labelled as this species, though in his memoir S. Langsdor{fii 
alone is mentioned. Our specimens cannot be distinguished from those from Spitzbergen 
figured by Heer, though in form and size the leaves are somewhat variable. Cones also 
