72(3 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



]\[alapoexna lamarexsis n. sp. 

 ri. XCIII, figs. 4, 5; PI. XCVI, &g. 5. 



Leaves thick, coriaceous, ovate-oblong-, tapering- ilown-ward to a long 

 weilge-sliaped base and upward to an acuminate or obtusely acuminate 

 apex; margin entire; midrib thick, straight; nervation pinnate, consisting 

 of 2 pairs of opposite thick ribs or secondaries, of which the lower pair 

 arise near the base and pass up for nearly half the length of the Idade, 

 while the other arise some distance up and pass nearly or quite to the 

 apex; several }iairs of small secondaries arise from the midrib in the extreme 

 u}iper ])art of tlie blade; ril)s witli occasional branches on the outside; 

 nervilles apparently percurrent. 



This species is represented by several specimens, 3 of the best of 

 which are figured. Unfortunately none of the specimens are perfect. The 

 larger and best-preserved specimen has 9 cm. retained, and must have 

 been 11 or 12 cm. in lengtli when complete. This specimen is 4 cm. wide. 

 Another example has 7 cm. of the upper portion preserved and is about 

 4.5 cm. wide. The small one figured is not quite 4 cm. in length and 

 alxiut 1.5 cm. in width. 



Among living species 31. lamarensis very nuudi resembles Tetrantlicra 

 (Litsc(i) dealhafa K. Br., from Australia, and also approaches Litsca ghtnca 

 Seib., from Japan — tliat is, it approaches these living species closely enough 

 to make it certain tliat the generic reference is correct. Among the fossil 

 species, Tefnnifhra jmecursoria Lx.,^ from the Bad Lands of Dakota, is quite 

 suggestive. This species is somcAvhat obovate instead of ovate-oblong, and 

 has about 4 pairs of secondaries, which do not differ in size as they do in 

 M. lamarensis. 



Habitat: East ])ank of Lamar River, between Cache and Calfee creeks; 

 collected by F. H. Knowlton, August 21, 1(S88. Yellowstone River, one- 

 hnlf mile below moutli of Elk Creek; collected by F. H. Knowlton, 

 August 27, 188.S. 



LiTSEA CUNEATA n. sp. 



PI. XCII, figs. 2-4. 



Leaf membranaceous, broadly lanceolate, wedge-shaped at base and 

 narrowed in about the same manner at apex; midrib very thick, straight; 



'Cret. aud Tert. Fl., p. 228, PL XLVIII, fig. 2. 



