374 Systematic Paleontology 



very close to the Lakota leaves which Fontaine^ identified as Czeha- 

 nowshia nervosa Heer/ The latter are certainly referable to Baiera and 

 not to Gzehanowshia as are Heer's type specimens in all probability. 

 The Potomac species may also be compared with the two small-leafed 

 species described by ISTathorst, from the lowermost Cretaceous or late 

 Jurassic of Advent Ba}''^ Spitzbergen, as Baiera spetshergensisf and 

 Baiera graminea.* The method of arrangement of the leaves is un- 

 known in these Arctic species^ and their apparent resemblance to the 

 Potomac species may be confined to the size and outline of the leaves. 



It may also be compared with Baiera Brauniana (Dunker) Bron- 

 gniart described by Dunker ^ from the Wealden of Germany as a Jean- 

 paulia and referred to Baiera by Brongniart.^ This species is slightly 

 larger than the Potomac species but it is otherwise very similar. It has 

 been recently identified by Seward '^ from the Jurassic of northeastern 

 Scotland, but it may be questioned whether the latter should not rather 

 be compared with some of the described Jurassic species. 



Occurrence. — Patuxent Formation. Near Dutch Gap Canal and 

 Sailors' Tavern, Virginia. 



Collections. — U. S. National Museum, Johns Hopldns University. 



Order CONIFERALES 



Family TAXACEAE 

 Subfamily TAXEAE 



Genus CEPHALOTAXOPSIS Fontaine 

 [Mon. U. S. Geol. Survey, vol. xv, 1890, p. 235] 



The utility of a new generic designation for the Potomac forms 

 included in this genus, is not altogether obvious with Cephalotaxites and 



^ Fontaine, in Ward, 19tli Ann. Rept. U. S. Geol. Surv., pt. ii, 1899, p. 685, 

 pi. clxix, figs. 1, 2. 



^Heer, Cont. Fl. Foss., Portugal, 1881, p. 18, pi. xvii, figs. 5-8, 10, 11. 



^Nathorst, Zur Mesozoische Flora Spitzbergens, Kgl. Svenska Vetens.- 

 Akad. Handl., Band xxx, No. 1, 1897, p. 53, pi. iii, figs. 6-12. 



^Nathorst, Ibid., p. 54, pi. iii, fig. 13. 



= Dunker, Monogr. Norddeutsch Wealdbild., 1846, p. 11, pi. v, figs. 2, 4. 



«Brongniart, Tableau, 1849, p. 107. 



'' Seward, Trans. Roy. Soc. Edinb., vol. xlvii, pt. iv, 1911, p. 680, tf. 9b. 



