56 FLORA OF THE MONTANA FORMATION. 
Colorado, but the matrix proves beyond doubt that it came from 
Black Buttes, Wyoming. The same is the case with another duplicate 
specimen of this species (No. 366). 
The original of fig. 2 (loc. cit.) is undoubtedly from Golden, Colorado, 
and that of fig. 5 from Hodges Pass, Wyoming, although this latter 
locality has been erased from the Museum catalogue. The originals of 
figs. 1 and 4 can not be found, nor can that of fig. 6, PL XIX, in the 
Cretaceous and Tertiary Flora, which is said to be in the National 
Museum. 
This species is also represented in the collection of leaves obtained 
by Mr. T. W. Stanton at Coalville, Utah. This determination rests 
upon the single specimen here figured. It is a very perfect leaf, more 
perfect in fact than any heretofore referred to this species. It is 
regularly and broadly ovate in shape, rounded abruptly to a slightly 
wedge-shaped base, and tapering above into a rather acute apex. The 
midrib is very thick and prominent, and the whole leaf evidently 
coriaceous and thick. The secondaries are alternate, parallel, and 
curve along the borders in simple bows. They do not appear to be 
branched as described for M. tenuinervis, and on this account may 
possibly represent another species. 
This Coalville leaf is undoubtedly very similar to fig. 5 of PI. XLV 
of the Tertiary Flora, which is said to have come from Bridger Pass, 
Wyoming. The secondaries can not all be made out, but none appear 
to branch as shown in the leaf from Bridger Pass. The Coalville 
specimen is also suggestive of M, pseudoacuminata Lx., from the 
Dakota group of Kansas. 1 The outline and apparent thickness of 
midrib are the same, yet the Dakota leaf has the secondaries at a 
more open angle, and they are often forked in the upper portion. M. 
psendoacuminata is undoubtedly related to M. tenuinervis. Tertiary 
Flora, PL XLV, fig. 5, and intermediate in some particulars stands the 
leaf from Coalville. It is altogether likely that this may represent a 
case of direct descent. If this supposition be correct, our knowledge 
of the development may stand as follows: 
Magnolia pseudoacuminata Lx., Dakota group. 
M. tenuinervis? Lx., Montana formation. 
M. tenuinervis Lx., Laramie and Denver groups. 
M. Inglefeldi Heer, Tertiary. 
M. acuminata L., living. 
This species is apparently rare at Golden, Colorado, for so far as 
known only three specimens, including one of the figured types, have 
been found there. Only one appears to have come from Bridger Pass, 
Wyoming, while the most abundant distribution is at Black Buttes, 
Wyoming. 
Habitat. — Coalville, Utah. Black Buttes and Hodges Pass, Wyoming. 
Golden, Colorado (Denver beds). 
l Fl. Dak. Gr., p. 199, PI. XXIV, fig. 2 (1891). 
