314 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



Occurrence. — Patuxent formation: Fredericksburg, Dutch Gap, 

 Virginia, Broad Creek, Maryland; Arundel formation: Arlington, 

 near Lansdowne, Maryland; Patapsco formation, Vinegar Hill, 

 Fort Foote, Maryland. 



Collections. — U. S. National Museum. 



ABIETITES MARYLANDICUS Fontaine. 



Abietites marylandicus Fontaine, in Ward., Monogr. U. S. Geol. Surv., vol. 48, 

 190G, p. 549, pi. 115, figs. 4, 5. 



Description. — Obscure impression of a narrowly oblong cone about 

 15 mm. wide and about 4 cm. long, covered with closely placed, rhom- 

 boidal scars, transversely elongated. The very stout peduncle might 

 be taken to indicate a stout cone with thin scales of which only the 

 basal portions were retained in the fossil. The relation of this cone 

 to the preceding species is altogether doubtful, it is retained in this 

 genus since the preservation is so vague that any effort to determine 

 its true affinity would be futile. 



In some respects it suggests the staminate cone of a cycad and it 

 may also be compared with cones of the coniferous genus Geinitzia 

 which are characteristic forms in the Albian, Cenomanian, and 

 Senonian. 



Occurrence. — Patapsco formation: Vinegar Hill, Maryland. 



Collection. — U. S. National Museum. 



ABIETITES FOLIOSUS (Fontaine). 



Leptostrobusfoliosus Fontaine, Monogr. U. S. Geol. Surv., vol. 15, 1890, p. 230, pi. 

 101, fig. 4; pi. 103, fig. 5; pi. 104, fig. 1; in Ward, Monogr. U. S. Geol. Surv., 

 vol. 48, 190G, p. 4S2. 



Laricopsis longlfolia Fontaine, Monogr. U. S. Geol. Surv., vol. 15, 1890, p. 233, 

 pi. 102, figs. 7, 8; pi. 103, figs. 2, 3; pi. 165, fig. 4; pi. 168, figs, 5, 6.— Fon- 

 taine, Proc. U. S. Nat, Mus., vol. 16, 1893, p. 268, pi. 36, fig. 9 (?).— Fon- 

 taine, in Ward, Monogr. U. S. Geol. Surv., vol. 48, 1906, p. 312, pi. 73, figs. 

 11, 14. 



Description. — Leaves long and slender, 0.5 to 1.0 mm. in width, full 

 length not seen, at least several centimeters, much crowded, seem- 

 ingly in bundles where the preservation is fairly good. 



This is clearly distinct from the preceding species and less common. 

 It is not fully characterized because of the poorness of preservation, 

 as evinced by the fact that the leaves are detached in a majority of 

 the specimens collected. The forms which were the basis for Lari- 

 copsis longifolia Fontaine have been united with this species since 

 they are indistinguishable and probably identical in character. 



This species occurs at the oldest and youngest horizons in the 

 Virginia Potomac and it has also been recorded from the Kootanie 

 formation of Montana, The fragment from the Trinity beds of Texas 

 which Professor Fontaine identifies with such certainty is, in the 

 writer's judgment, absolutely untrustworthy. 



