4492 BERRY: SPECIES REFERRED TO THINNFELDIA 
latter, which seems to be the most similar to the fossil leaf, from 
St. Kitts and Central America are somewhat smaller, although 
specimens from the north coast of South America average larger 
and exactly resemble the fossil leaf in size and outline. They 
differ, however, as do most of the Podocarpeae, in their very entire 
margins, their indistinct vertical secondaries and the form of their 
midrib, which in all species of Podocarpus which I have seen, ex- 
cept Podocarpus Nageia R. Br. from Japan, is thick and promi- 
nently marked to the tip of the leaf, while in the fossil leaf the 
midrib is obliterated by its dichotomous branching some distance 
below the apex and the secondaries branch at an acute angle and 
do not parallel the midrib. 
Protophyllocladus polymorphus (Lesq.) 
Salisburia polymorpha Lesq. Am. Jour. Sci. II, 27: 362. 
1859 (nom. nudum); Ann. Rep. U. S. Geol. & Geog. Surv. 
Terr. 1872: 404. 1873; Tert. Fl. 84. p16. f. go, gz. 1878. 
Thinnfeldia polymorpha Knowlton, Proc. Biol. Soc. Wash. 7: 
153. 1892; Bull. U.S. Geol. Surv. 105: 47. pl. 5. [2]. f. I-4 
1893. (Not TZ. polymorpha Ettingshausen, 1860.) 
Thinnfeldia montana Knowlton, Bull. U. S. Geol. Surv. 152: 
227. 1898; Bull. U.S. Geol. Surv. 163: 11. pl. 7. f. 1-3. 1900: 
Fragmentary remains from Nanaimo, Vancouver Island, were 
named Salisburta polymorpha by Lesquereux and were subsequently 
described and figured fora final report which was never published. 
He afterward described under the same name specimens from Mon- 
tana, although not positive of their identity with the Vancouver 
specimens. Whatever may be the final disposition of the Nanaimo 
forms, those from Montana are certainly not referable to Salisburia 
(Ginkgo), although evidently Coniferous, Lesquereux’s type figures 
(Tertiary Flora, p/. 60. f. go, 42), greatly resemble in both form and 
venation certain leaves of existing species of Phyllocladus,for instance 
Phyllocladus asplenifolia Hook. f., although they are somewhat 
larger, and the remains referred to this species by Knowlton are still 
larger and petiolate. This species is closely allied to the two preced- 
ing and according to Knowlton is positively related to Phyllocladus. 
It occurs in beds of Montana,* Laramie, and Livingston age. 
( * Belly River series, on the Missouri River seven miles below Coal Banks, Montan4, 
In strata which are at least in part synchronous with the Montana formation. 
