6 SIR J. W. DAWSON ON THE MESOZOIC FLOEAS OP 



The pinnules are rather larger, more narrow and more pointed upward than in Heer's 

 specimens. It may be described as follows : Bij^innate, or tripinuate, pinnules elongate, 

 free or united only at the base, lanceolate, slightly curved upward, 1Ô millemetres long 

 and 4 to 5 broad, entire. Midrib slender, giving off veins at an acute angle and which 

 are dichotomous. The species is widely distributed in time and space, and our specimens 

 are probably of one of its varietal forms. 



Collected by G-. M. D. near Canmore, Eocky Mountains. 



2. Cz/cadacece. 



DiooNlTES BOREALis, Dawsoti. (Plate I. Fig. 2.) 



Cretaceous and Tertiary Floras, Transactions of the Royal Society of Canada, Vol. I. 

 Sec. IV. p. 24, PI. III. 



This species was described in the memoir above cited from a specimen collected by 

 Mr. R. Gr. McCounell, at Willow Creek, in beds known to be Cretaceous, but of uncertain 

 horizon. Additional specimens, collected at Martin Creek by Dr. Gr. M. Dawson, show that 

 the frond contained twenty or more pairs of pinnules nearly at right angles to the midrib 

 below, but above curving upward to an angle of 30°. The pinnules are 10 to 1-5 milli- 

 metres broad and with 15 to 26 veins. 



This frond might be referred to the provisional genus, PterophyUum, but its characters 

 are so much those of Dioon that I have no hesitation in giving it the generic name indi- 

 cating this affinity, and the association of Dioon-like fniits with similar leaves in the 

 Lower Cretaceous of the Queen Charlotte Islands confirms the reference. The genus is 

 elsewhere in the northern temperate regions characteristic of the Wealden and other beds 

 at the base of the Cretaceous, but it extends into the Middle Cretaceous and still exists in 

 Mexico. 



Collected by G. M. D. 



PoDOZAMlTES L.4.NCE0LATUS, Lindley. (Plate I. Fig. B.) 



Zaviia lanceolata, Lindley and Hutton. 



Leaves uudistiuguishable from those of this world-wide species occiir in all of the 

 collections from the beds of the Kootanie group throughout its range, and contribute, by 

 their abundance in some layers, to give a Jurassic character to the v/hole. It is regarded 

 as a Jurassic type, though varieties or sub-si^ecies belonging to or allied to it extend into 

 the Urgoniau or Lower Cretaceous. This species has been recognised in England, in 

 Sweden, in Siberia, in India, and in China ; and Heer, apjDarently with reason, identifies 

 with it P. distans and P. Ekhioaldii, of Schimper, and Zamites Haueri, of Ettiugshausen. 

 The specimens from Martin Creek, and from Coal Creek, Crow's Nest Pass, are very good 

 and characteristic, and belong to the ordinary A'ariety. Var. hdifolia occurs at Martin 

 Creek, and a narrow variety at the Middle Branch of the North Fork of Old Man River. 

 This may be regarded as the most charactei-istic form in the Kootanie series, and is the more 

 valuable, as nothing resembling it is known to occur in the flora of the Upper Cre- 

 taceous.' 



Collected by Gr. M. D. at Martin Creek, N. Kootanie Pass, etc. 



' In his Report of 1883, Lesquereux has noticed several leaflets from lUe Dakota group referable to this genns. 



