388 GEOLOGICAL SURVEY OF THE TERRITORIES. 



A large number of these leaves, varying in length from 10 to 15 cent., 

 2 J to 4 cent, wide, with a petiole about 2 J cent, long; medial nerve 

 thick, secondary veins numerous, distinct, parallel, diverging about 60° 

 to a distance from the borders, where they curve irregularly, anasto- 

 mosing manj' times with the superior veins and undulating along the 

 borders ; librilla) thin, but distinct ; some of them intermediate to 

 secondary veins, being thicker and ascending as Tertiary veinlets to half 

 the leaf, anastomosing, with branches of the true secondary veins. This 

 species closely resembles Asimiria triloba, Dun, by the form and size of 

 the leaves, and A. parviflora, Dun, by the nervation. A fruit of this 

 genus, A. leiocarpa, Lsqx., has been published from the Mi&sissii^pi 

 Eocene. 



A.CER TEiLOBATUM, VAE. PRODUCTUM, Al. Br. in Heer, n. Tert. Helv., 

 Vol. Ill, p. 47, PI. cxv. Figs. C to 12. 



Among other fragments representing this species, there is a large 

 leaf preserved entire 15 cent, long, narrowed at base to a long petiole, 

 enlarging in the middle into two long, sharply taper-pointed, nearly 

 entire lobes, with obtuse sinusses and a middle, elongated lobe, marked 

 by large distant teeth, a form resembling that in Heers' loo. cit, 

 Figs. 8, 11, 12. The narrow base and taper-iiointed lobes are as in Fig. 

 8, and the medial lobe with its base enlarged to the obtuse siuusses as 

 in Figs. 11 and 12. Our leaf is at least twice as large as the European 

 ones. Some pieces of shale of the same locality have fossil fruits of 

 Acer with small oval nutlet and narrow erect wings, not larger than 

 those represented in Heer, loc. cit., PI. cxii, Fig. 21, which the author 

 refers to Acer grosse-dentatum. Fig. 106, however, has too, in its upper 

 part, a fruit like the one of Fig. 21, still smaller, referred to Acer trilo- 

 hatiim. In Ouis, the support of the wing on the border is scarcely 

 arched. 



Paliurus Colombi, Heer, in Kept. 1871, p. 288. 



A large uuiBber of leaves all of the same character as those described 

 from the Washakie group. 



ZiZYPHUS Meekii, sp. nov. 



Leaves ovoid, obtusely acuminate or obtusely pointed, rounded to the 

 petiole, obtusely crenate, three-nerved from the base. 



Many leaves of this species were found at Carbon by Professor B. F. 

 Meek and myself. They differ little .in their characters, being only 

 slightly more or less wide. They average 5 cent, in length, from 2J to 

 3^ cent, broad ; the borders are crenate from near the base to the obtuse 

 I)oint, the three immary veins are simple, the lateral ones ascending to 

 or quite near the point of the leaves. In the broader leaves there is 

 from the base a second jiair of lateral veins, which follow the borders to 

 the middle of the leaf; the substance is somewhat thick, sub-coriaceous, 

 the surface being generally covered by a thin coating of carbonaceous 

 matter which obliterates the fibrilla?. These are in a right angle with 

 the medial nerve. The species is allied to ZizypUus ovatus, Web., in 

 Pal., Vol. VIII, 1). 89, PI. vi. Fig. 1, at least for its nervatioii. It has 

 also some analogy with Zizyplms hyperboreus, Heer, from which it differs 

 by shorter, broader leaves, &c. 



