, Maryland Geological Survey 347 



unsuccessful, because of the granular nature of the lignite due to the 

 advanced stage of decay reached by the pinnules before preservation. 



Occurrence. — Patdxent Formation. Fredericksburg, Kankeys, 

 Dutch Gap, Virginia. Patapsco Formation. Mt. Vernon, Dumfries 

 Landing, Widewater, Virginia; Gray's Hill, Vinegar Hill, Stump Xeck, 

 Maryland. 



Collection. — U. S. National Museum. 



Zamites crassinervis Fontaine 

 Plate LIV, Fig. 6 



Zamites crassinervis Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 1889, 



p. 172, pi. Ixix, fig. 4; pi. Ixxxiii, fig. 3. 

 Zamites ovalis Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 1889 (pars), 



p. 173, pi. Ixxxv, fig. 4; pi. clxx, fig. 3. 

 Zamites. SV; Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 1889, p. 173, 



pi. Ixxxiv, fig. 12. 

 Zamites crassinervis Penhallow, 1902, Trans. Roy. Soc, Can., series ii, vol. 



vii, sec. iv, p. 41. 



Description. — " Leaves broadly elliptical, short, acute, abruptly nar- 

 rowed at base and attached by a callosity; nerves simple or forking at 

 the very base, very strong, distant, parallel to near the apex, where they 

 are more crowded." — ^Fontaine, 1890. 



This species is not well marked and is unimportant and rare. Were 

 it not for the indications of a callosity the writer would be inclined to 

 refer these forms to Podozamites distantinervis Fontaine, which they 

 greatly suggest. It has been recorded by Penhallow from the Cretaceous 

 of Alliford Bay, Queen Charlotte Islands, but little reliance can be 

 placed in the identification. 



Occurrence. — Patusent Formation. Fredericksburg, Dutch Gap, 

 Potomac E.un, Kankeys, Virginia. 



Collection. — U. S. National Museum. 



Genus CTENOPSIS gen. nov. 

 Fronds pinnate, of large size. Pinnae inserted latterly on a stout 

 rachis, the angle of insertion dependent upon the proximal, distal or 



