750 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



Several s^peciiiieus of this interesting' sjiecies are known. The most 

 perfect cue is fi<>-ured, and is 7 cm. in lenoth, and yet lacks a small portion 

 of both base and ajjex. It is a little more than 2.5 cm. Itroad. It is quite 

 regularly elliptical-lanceolate in shape, with a rounded, ratlier obtuse apex 

 and a more narrowed base. The secondaries appear to be uniforml}^ of 



4 pairs, those in the u|)per portion of the leaf arching around and entering 

 the pt)int. 



This species has some resemblance to tlie prcct^ding species, which 

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

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



It difters from Cormis ovaUs Lx.,^ from Table Mountain, California, in 

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



Among living sjjecies this has consideralile atttnity with C. pankiilata 

 I'Her., especially with certain of the narrow-leaved forms. 



I ha\e 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 AVeed, September 20, 1885. 



ERICACEAE. 



Arctostaphylos elliptica n. sp. 

 PI. XCVII. fig. 2. 



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

 wedge-shaped at base; midril) thick, slightly flexoiis: secondaries about 



5 pairs, alteiniate, lower ones short, at a low angle, upj)er ones at an angle 

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

 join the one next al)ove; nervilles strong, percurrent; liner 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 

 fiexuous midrib. The secondaries are also strong, the ui)per ones arching 

 and joining in the upper ])art of the leaf. 



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

 It is e\'idently related to the bearberry (Arctostaphijlos uva-ursi) in shape, 



' Mem. Una. Comp. Zor.l., Vol. VI, No. 1, p. 2S, I'l. VI, tigs. 1, 2. 



