knowlton.] DESCRIPTION OF SPECIES. 73 
obtuse and not having the lower pair of secondaries opposite and so 
strongly branched. They are probably the same, however. 
The leaf depicted in tig. 3, PI. XIX, is also anomalous, and may not 
be the same. It is incomplete, but has practically the same nervation, 
the main difference being in the outline, this one being more acuminate 
than the typical form. 
Habitat. — Point of Kocks, and I Hack Buttes, Wyoming. 
Viburnum montanum n. sp. 
PI. XIX, figs. 1, 2. 
Leaves broadly ovate in general outline, wedge shaped at base, obtuse 
at apex; margin with numerous shallow teeth; petiole short, thick; 
midrib rather thin, straight or slightly nexuose; secondaries five or six 
pairs, the lower pair strongest, springing from near the base of the 
blade, much branched on the outside, the branches all entering the 
teeth ; upper secondaries alternate, nexuose, forked, the branches enter- 
ing the teeth; nervilles prominent, mainly percurrent, approximately at 
right angles to the secondaries; finer nervation not preserved. 
The two examples figured appear to be all that were obtained of t lis 
species. Neither of them is perfect, yet they are sufficiently well 
preserved to permit the character to be made out. They are about 
10 cm. in length and G cm. in width, are broadly ovate in general out 
line, with numerous shallow teeth above the base. In nervation they 
have the appearance of being palmately three-nerved, but the low- 
est pair of secondaries is simply the largest, and they are copiously 
branched on the outside, the branches entering the teeth. The upper 
secondaries are alternate and forked, the branches passing to the 
teeth. 
These leaves were at first referred to Viburnum marginatum Lx., 1 
with which they undoubtedly have considerable affinity, but inasmuch 
aas they differ in important particulars it seemed best to regard them 
as distinct, at least until further material could be obtained. Viburnum 
marginatum or Platanus marginata, as it is called by Heer, is undoubt- 
edly a composite species, and should be divided. 
This species is also quite similar to Platanus Newberryana Heer 2 from 
the Dakota group of Nebraska, which differs in not being palinately 
three-nerved. The secondaries are all of nearly equal size, and the 
branches end in the small teeth. Its facies is more distinctly Platanoid 
than the one under discussion. 
Habitat. — Point of Kocks, Wyoming. 
iTert. PL, PL XXXVIII, figs. 1-5 (1878). 
*Lx., Cret. ;iiul 'lot. PL, ]>. 72, PL IX, fig. 3 (1874). 
