knowlton.] DESCRIPTION OF SPECIES. 67 
Pterospermites undulattjs n. sp. 
PI. XVI, fig. 3; PL XVII, fig. 2; PI. XVIII, fig. 4. 
Leaf large, oblong-oval, wedge-shaped at base, margin undulate; 
midrib thick, straight, or slightly tiexuose; secondaries seven or eight 
pairs, opposite (or alternate in middle of leaf), at an angle of 50°, camp- 
todroine; lowest pair of secondaries with about seven camptodrome 
branches on the outside; upper secondaries sometimes branching; 
nervilles strong, at right angles to the secondaries, often forking. 
Neither of the three leaves referred to this species is perfect. The 
larger one, which represents the upper portion of a leaf, is 8 cm. broad 
and has 11 cm. in length preserved. The smaller and more perfect one 
(fig. 3, PI. XVI) is nearly 6 cm. broad and must have been 12 or L3 
cm. long. In fig. 2 the secondaries above the lowest pair are branched. 
Both have the undulate margin and similar nervation. 
This species differs from the preceding, P. Wardii, in being much 
larger, in having an undulate instead of a serrate margin, a wedge- 
shaped instead of a rounded base, and the lowest pair of secondaries 
with numerous branches on the outside. 
Habitat. — Point of Rocks, Wyoming, north of station and midway of 
cliff. Collected by Lester F. Ward, September, 1881. 
CORNUS RHAMNIFOLIA O. Web. 
(ornus rhamnifoUa O. Web.: Lesqnereux, Ann. Rept. U. S. Geol. and Geog. Snrv. 
Terr., 1871, Suppl., p. 9 (1872) ; ibid., 1873, p. 387 (1874) ; ibid., 1876, p. 513 (1878); 
tert. PI., p. 244, PI. XLII, fig. 6; McBride, Pop. Sci. Mo., Vol. XXIII, p. 641, fig. 
12 (1883). 
This common European Miocene species is represented in American 
strata by a small number of more or less imperfect leaves. The speci- 
men figured by Lesquereux in the Tertiary Flora is preserved in the 
United States National Museum (No. 357), together with a single addi- 
tional specimen from the Bozeman (Montana) coal field. The type 
specimen is recorded as having come from Camp Station, near Point of 
Rocks, Wyoming, but judging from the matrix the specimen seems 
much more likely to have come from Evanston. This matrix is unfa- 
miliar from any Point of Rocks locality, yet in absence of further proof 
it must remain, nominally at least, a Point of Rocks species. 
The specimen from the Bozeman coal field (No. 933) is in the hard 
whitish sandstone of the true Laramie beds. It is similar to a number 
of doubtful specimens obtained in recent years at the mouth of Fir 
Canyon, 3 mles southeast of Bozeman, Montana. 
The specimens referred to this species by McBride (loc. cit.), from the 
Bad Lands of the Little Missouri, are doubtful. The exact locality is 
not stated, although it is probably in Fort Union strata. The upper 
portion of the leaf figured is destroyed, and it is not possible to be 
certain that it is a Cornus. 
