no. 1821. REVISION OF POTOMAC PLANTS— BERRY. 313 



Fontaine, as are also some of the species described by Coemans 1 

 from the Lower Cretaceous of Belgium and by Carruthers 2 from the 

 Gault of England. Finally the foliage from the Potomac beds which 

 has been referred to Leptostrobus and Laricopsis is neither Leptostrobus 

 nor related to the modern Larix, and since such foliage in the English 

 Wealden is in organic union with cones of the Abietites rnacrocarpux 

 type, 3 it seems eminently proper in the treatment of the American 

 material to associate this type of foliage with the corresponding type 

 of cone. 



ABIETITES MACROCARPUS Fontaine. 



Abietites macrocarpus Fontaine, Monogr. U. S. Geol. Surv., vol. 15, 1890, p. 262, 



pi. 132, fig. 7.— Fontaine, in Ward., Monogr. IT. S. Geol. Surv., vol. 48, 1906, 



pp. 261, 547, pi. 68, figs. 15, 16; pi. 115, figs. 2, 3. 

 Abietites ellipticus Fontaine, Monogr. U. S. Geol. Surv., vol. 15, 1890, p. 263, pi. 



132, figs. 8, 9; pi. 133, figs. 2-4; pi. 168, fig. 8. 

 Abietites angusticarpus Fontaine, Monogr. U. S. Geol. Surv., vol. 15, 1S90, p. 263, 



pi. 133, fig. 1.— Fontaine, 19th Ann. Rept. U. S. Geol. Surv., Pt. 2, 1899. 



p. 671, pi. 163, fig. 14. — Fontaine, in Ward., Monogr. U. S. Geol. Surv., vol. 



48, 1906, pp. 528, 538, 556, 572, pi. 114, fig. 10. 

 Williamsoniaf bibbinsi Ward, Fontaine, in Ward, Monogr. U. S. Geol. Surv., vol. 



48, 1906, p. 554, pi. 115, fig. 11. 

 Abietites cali/ornicus Fontaine, in Diller and Stanton, Bull. Geol. Soc. Amer., 



vol. 5, 1894, p. 450 (nomen nudum). 



Description. — Large, stout cones, with a stout axis and numerous, 

 long, thin, imbricated, appressed scales. The various specimens vary 

 considerably in length and appearance, all being much macerated 

 and poorly preserved. 



The author is unable to find good characters for the separation, of 

 the forms included in the foregoing synonymy. The supposed Wil- 

 liamsonia is nothing but a cone fragment vertically compressed as 

 Professor Ward surmised. Described originally from the Patuxent 

 formation of Virginia they have since been identified in the Shasta 

 group (Horsetown beds) of California and the Lakota formation of 

 the Black Hills, while a very similar cone fragment has been de- 

 scribed from the Trinity group of Texas as Abietites linkii (Roemer) 

 Dunker. 



These cones are comparable with a number of previously described 

 species, and they are especially close to Pinites solmsi Seward from 

 the English Wealden, as the latter author has already pointed out. 

 From the foliage preserved with the English cones, which is identical 

 with what Professor Fontaine referred to Leptostrobus, it is possible 

 that the latter type of foliage was borne by the tree which furnished 

 the cones just described. 



1 Coemans, M6m. Acad. Roy. Belg., vol. 36, 1867. 



" Carruthers, Geol. Mag., vol. 3, 1866, pp. 534-546, pi. 20, 21. 



8 Seward, Wealden Flora, pt. 2, 1895, p. 197, pi. 18, figs. 2, 3; pi. 19. See especially pi. IS, fig. 2. 



