28 
The assemblage of plants comprises, besides stems of unidentified 
lignified wood, the following: 
Nilssonia cf, densinerve (Fontaine). Loc. 138. 
Brachyphyllum mcleami, n. sp, Loc. 136. 
Pityophyllum graminaefolium (Knowlton). Loc. 136. 
Cladophlebis cf. albertsii (Dunker). Loc. 136. 
Onychiopsis ? sp. Loe. 136. 
The age of the deposit, as inferred from this assemblage, is considered 
to be either Upper Jurassic or early Lower Cretaceous, with preference 
towards the latter on account of the presence of the species Pityophyllum 
graminaefolium that is abundant and widespread in the Kootenay. 
DESCRIPTION OF SPECIES 
Nilssonia cf. densinerve (Fontaine) 
Plate XIV 
Fragments of two fronds. The larger fragment is an imprint of the 
upper surface, 13 cm. in length and 4*1 cm. in width, simple and undis- 
sected. The midrib has a median keel to which the veins, which are 
numerous (16 or 17 to a centimetre), may be traced, proving the attach- 
ment of the lamina to the upper surface as in Nilssonia. A second frag- 
ment, only partly exposed beneath the first, shows the lower surface, and 
the midrib, which is 3 mm. wide, stands out more prominently. The 
species is close to, and perhaps identical with, N. densinerve (Fontaine). 
Brachyphyllum mclearni n. sp. 
Plate XV, figures 1-11; Plate XVI, figures 1-14; Plate XVIII, figure 10 
Vegetative shoots comprise small flat twigs, 1 to 7 mm. diameter, 
branching at acute angles, clothed with spirally arranged, acutely pointed, 
triangular, subrhombic, or sublanceolate, closely appressed, moderately 
thick, fleshy leaves. Apices of leaves, beak-like, particularly along narrow 
edges of stems, and rarely reflected outwards as short spines. Leaves, 
imbricating, except on parts of older stems, finely striate under low 
magnification. Cuticles from abaxial surface of leaves reveal rows of 
epidermal straight-walled cells, the individual cells somewhat elongated 
parallel to the longer leaf borders, interrupted by unevenly spaced and 
scattered stomata that are arranged in irregular, discontinuous rows. 
Individual stomata are surrounded by a ring of 4 to 6 cells. 
Cones, ovate, largest 27 by 18 mm., smallest 9 by 7 mm., borne 
singly at the ends of small branches (diameter 1 to 2 mm.). Scales, imbric- 
ating, laterally expanded, spirally arranged, somewhat kite-shaped, with 
abrupt apiculate distal apices, and narrowed proximal ends. 
