214 
meters long and 1.5 centimeters wide. The 
average dimensions of a large number of speci- 
mens, however, are 6 to’7 centimeters long by 
1 to 1.3 centimeters wide. 
Leaves thick, with smooth surface. Rachis 
and midrib stout. Venation more prominent 
than in the other species but still very faint, 
with the exception of the secondaries, which 
though fine are more conspicuous than in the 
other species. Secondaries forming a wide 
angle with the midrib, nearly straight for two- 
thirds of the distance to the margin, where they 
bend sharply upward and join the secondary 
next above by a slightly curved arch. As the 
secondaries are numerous and almost uniformly 
spaced the venation resembles that of a 
Eucalyptus except that the marginal hem is 
much broader than in that genus. In fact 
some of the detached leaflets were determined 
by. Ward as forms of Eucalyptus, as also was 
some of the Virginia material of this species. 
This species is exceedingly abundant at many 
localities in the Patapsco formation in Maryland 
and Virginia and is by far the most characteristic 
species of that ‘formation, although it has not 
been detected at certain other undoubted 
Patapsco horizons. Not especially characteris- 
tic material is abundant along Oak Creek, 
Wyo., in beds that have been referred to the 
Fuson formation. This species was also sug- |. 
gested by Cockerell ” for some leaves from an 
unknown geologic horizon in southwestern 
Colorado. Ihave since examined this material, 
which is very inconclusive, in my opinion, 
Cockerell infers that Sapindopsis may be re- 
lated to Gnetum, but I cannot see any warrant 
for such a supposition. 
This species is an exceedingly variable form 
in‘all its details, and as during maceration the 
most variable apical portion is the last to be 
destroyed, this variability is emphasized in 
fragmentary material such as that usually 
found. When well preserved it furnishes most 
striking specimens, as may be seen from the 
specimens reproduced photographically in 
Plate LV (figs. 2-4).. In life its rigid pinnate 
leaves and strict appearance must have made 
it a very striking member of the Cheyenne 
flora. 
The Cheyenne sandstone occurrences of 
Sapindopsis variabilis are Osage Rock at: Bel- 
* Cockerell, T. D. A., Washington Acad. Sci. Jour., vol. 6, p. 110, 1916. 
| size but somewhat variable. 
SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY, 1921. 
videre (2217, 2232) ; Stokes Hill (2220) ; Thomp- 
son Creek near the flume, 2 miles northwest of 
Belvidere (2221); Champion (Wildcat) Draw, 
three-fourths mile south of Belvidere (2222); 
Champion (Wildcat) Draw, right (east) branch, 
in “Lanphier shale,” half a mile south of 
Belvidere (2224, 2228, 2231); in shale in a draw 
1 mile southwest of Belvidere (2225) ; left bank 
of middle branch of Champion (Wildcat) Draw 
(2229); shales in draws north of Belvidere 
(2230); first draw west of Champion (iildeat) 
Draw. (2233). 
Sapindopsis magnifolia Fontaine. 
Plate LV, figure 5; Plate LVI, Plate LVII, figure 2; Plate 
LIX, figure 3. 
Sapindopsis magnifolia Fontaine, U. 8. Geol. Survey 
Mon. 15, p. 297, pl. 151, figs. 2, 3; pl. 152, figs. 2, 3; 
pl. 153, fig. 2; pl. 154, figs. 1, 5; pl. 155, fig. 6, 1890; 
in Ward, U. S. Geol. Survey Mon. 48, pp. 481, 482, 
528, 1906. 
Berry, U. S. Nat. Mus. Proc., vol. 38, p. 642, 1910; 
Maryland Geol. Suryey, Lower Cretaceous, p. 471, 
pl. 86; pl..87, fig. 1; pl. 88, 1911. 
Araha dubia Fontaine, U. §. Geol. Survey Mon. 15, p. 
314, pl. 157, figs. 1, 7, 1890. 
Sapindopsis obtusidolia Fontaine, idem, p. 301, pl. 156, 
fig. 13; pl. 159, figs. 3-6. 
Ficophyllum eucalyptoides Fontaine, idem, p. 294, pl. 164, 
figs. 1, 2; in Ward, U. 8. Geol. Survey Mon. 48, p. 
489, 1906. 
Sapindopsis tenuinervis Fontaine, U. S. Geol. Survey 
Mon. 15, p. 301, pl. 153, fig. 1, 1890; in Ward, 
U.S. Geol. Survey Mon. 48, pp. 489, 528, 1906. 
Rhus uddeni Lesquereux, U. 8. Geol. Survey Mon. 17 
(Flora of the Dakota group), p. 154, pl. 57, fig. 2, 
1892. 
Knowlton, in Hill, Am. Jour. Sci., 3d ser., 
p. 213, 1895, 
Leaves commonly odd-pinnate, although a 
few even-pinnate forms occur, of considerable 
Leaflets three 
pairs, comparatively large, lanceolate, tapering 
almost equally toward apex and base, the base 
inequilateral except in terminal leaflets, pointed, 
often lacking apical portions, length increasing 
proximad, averaging about 10 centimeters, 
longest seen 14 centimeters (estimated), short- 
est 5 centimeters, width varying from 1.1 to 3.2 
centimeters, inequilateral, as the outer half of 
the lamina is broader than the inner half and is 
markedly decurrent. This feature is least em- 
phasized in the basal leaves, which may even 
have a considerable petiole, but becomes in- 
creasingly pronounced distad, the terminal 
leaflets often forming a bilobate or trilobate 
vol. 50,’ 
