726 GEOLOGY OF THE YELLOWSTONE NATIONAL PAKK. 



Malapoentsta lamarensis n. sp. 

 PL XOIII, tigs. i, 5; PI. XCYI, fig. 5. 



Leaves thick, coriaceous, ovate-oblong, tapering downward to a long 

 wedge-shaped 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 blade, 

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

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

 upper part of the blade; ribs with 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 length 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 

 about 1.5 cm. in width. 



Among living species M. lamarensis very much resembles Tetranthera 

 (Litsea) dealbata R. Br., from Australia, and also approaches L'rtsea glcmca 

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

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

 species, Tetranth ra '. -prcecursoria Lx., 1 from the Bad Lands of Dakota, is quite 

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

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

 JM. lamarensis. 



Habitat: East bank of Lamar River, between Cache and Calfee creeks; 

 collected by F. H. Knowlton, August 21, 1888. Yellowstone River, one- 

 half mile below mouth of Elk Creek; collected by F. H. Knowlton, 

 August 27, 1888. 



Litsea uuneata n. sp. 



PL 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; 



1 Cret. and Tert. Fl., p. 228, PI. XLVIH, 6g. 2. 



