408 Systematic Paleontology 



in the slides kindly furnished the writer by Professor Jeffrey. A single 

 additional species has more recently been described by Stopes ' from 

 the Upper Cretaceous of Japan and this latter is said to lack centrip- 

 etal xylem, a feature in any case of considerably less theoretic impor- 

 tance than is assigned to it by Professor Jeffrey. Still more recently 

 the latter author has described another species from the Magothy for- 

 mation o'f Marthas Vineyard.^ 



The genus Leptostrohus was proposed by Heer ^ in 1876 for certain 

 Siberian Jurassic cones, although in 1880 remains of foliage were also 

 correlated with these cones.* Five species in all were described. The 

 age of the containing beds is Oolitic. 



Subsequently this generic name was utilized by Ward and Fontaine 

 for a considerable number of American Jurassic and Cretaceous species 

 based on an assortment of probably unrelated vegetative twigs, supposed 

 cones, and seeds or fruits. 



Occurrence. — Patuxent Fokmation". Fredericksburg, Potomac Eun 

 and Dutch Gap, Virginia. Patapsco Formation. Brooke, 72-mile post 

 Mt. Vernon and Hell Hole, Virginia; Ft. Foote, Vinegar Hill (very 

 common), and Federal Hill (Baltimore), Maryland. 



Collection. — TJ. S. National Museum. 



Abietites foliosus (Fontaine) Berry 



Leptostrobus foliosus Fontaine, 1890, Mon. U. S. Geol. Survey, vol. xv, 1889; 



p. 230, pi. ci, fig. 4; pi. ciii, fig. 5; pi. civ, fig. 1. 

 Laricopsis longifoUa Fontaine, 1890, IMd., p. 233, pi. cii, figs. 7, 8; pi. ciii, 



figs. 2, 3; pi. clxv, fig. 4; pi. clxviii, figs. 5, 6. 

 (?) Laricopsis longifoUa Fontaine, 1893, Proc. U. S. Nat. Museum, vol. xvi, 



p. 268, pi. xxxvi, fig. 9. 

 Leptostrohus foliosus Fontaine, 1906, in Ward, Mon. U. S. Geol. Survey, vol. 



xlviii, 1905, p. 482. 

 Laricopsis longifoUa Fontaine, 1906, IMd., p. 312, pi. Ixxiii, figs. 11, 14. 

 Abietites foliosus Berry, Proc. U. S. Natl. Mus., vol. xl, p. 314. 



^ Stopes, Annals of Bot., vol. xxiv, 1910, pp. 395-402, pis. xxvii, xxviii. 

 "^ Jeffrey, Proc. Bost. Soc. Nat. Hist., vol. xxxiv, 1910, pp. 333-338, pi. xxxiii. 

 ^ Heer, Fl. Foss. Arct, Band iv, Abt. ii, 1876, p. 72. 

 *Heer, IMd., Band vi, Abth. i, 1880, p. 23. 



