750 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



Several specimens of this interesting species are known. The most 

 perfect one is figured, and is 7 cm. in length, and yet lacks a small portion 

 of both base and apex. It is a little more than 2.5 cm. broad. It is quite 

 regularly ellipticaldanceolate in shape, with a rounded, rather obtuse apex 

 and a more narrowed base. The secondaries appear to be uniformly of 



4 pairs, those in the upper portion of the leaf arching around and entering 

 the point. 



This species has some resemblance to the preceding species, which 

 differs, however, in being much larger and in having an acuminate apex and 

 numerous (8 or 9) secondaries. Thev can not be identical. 



It differs from Comas ovalis Lx., 1 from Table Mountain, California, in 

 shape and nervation, this species being oval, with obtuse base and apex. 



Among living species this has considerable affinity with C. paniculata 

 l'Her., especially with certain of the narrowdeaved forms. 



I have named this species in honor of Mr. George M. Wright, one of 

 the collectors. 



Habitat: Fossil Forest section, Hague's Yellowstone Park collection, 

 No. 22c of section; collected by Wright and Weed, September 20, 1885. 



ERICACEAE. 



Arctostaphylos elliptica n. sp. 

 PI. XCVII, tig. 2. 



Leaf very thick, leathery; elliptical in shape, obtuse above, slightly 

 wedge-shaped at base; midrib thick, slightly flexous; secondaries about 



5 pairs, alternate, lower ones short, at a low angle, upper ones at an angle 

 of about 45°, soon curving upward and arching about near the margin to 

 join the one next above; nervilles strong, percurrent; finer nervation 

 obsolete. 



This fine little leaf is almost perfect. It is 4.5 cm: in length and 18 mm. 

 in width. The petiole is about 3 mm. long and is very thick, as is the 

 flexuous midrib. The secondaries are also strong, the upper ones arching 

 and joining in the upper part of the leaf. 



This leaf is very thick, showing that it was of firm, leathery texture. 

 It is evidently related to the bearberry (Arctostaphylos woa-wrsi) in shape, 



'Mem. Mus. Comp. Zool., Vol. VI, No. 1, p. 23, PI. VI, tigs. 1, 2. 



