Maryland Geological Survey 499 



Prote^phyllum ovatum Fontaine 



Protecephyllum ovatum Font, 1890, Mon. U. S. Geol. Survey, vol. xv, 1889, 

 p. 285, pi. cxli, fig. 1 (non Fontaine in Ward, 1906, p. 510). 



Protecephylluvi elUpticum Font, 1890, Mon. U. S. Geol. Survey, vol. xv, 1889, 

 p. 285, pi. cxlii, figs. 1, 2. 



Protecephyllum tenuinerve Font, 1890, Mon. U. S. Geol. Survey, vol. xv, 

 1889, p. 286, pi. cl, fig. 13; pi. clvi, fig. 2. 



Description. — "Leaves of medium (and large) size, ovate-acute, with 

 the tip bent to one side, abruptly rounded at base, and subcordate; 

 midnerve very thick and apparently somewhat succulent; primary nerves 

 very slender, going off nearly opposite in pairs, basal pair leaving at a 

 very large angle and curving strongly around approximately parallel 

 to margin, those higher up leaving at more and more acute angles, curv- 

 ing gently until near the margin of the leaf, and then bending strongly 

 upwards, gradually approaching the margin, sending off slender branches, 

 which anastomose to form large, lax, and mostly irregular quadrangular 

 primary meshes; ultimate meshes variable in size, distinctly defined, 

 and formed chiefly by the meeting of the nerves under large angles." — 

 Fontaine, 1890. 



Ko new material which can be referred to this protean species has 

 been collected and its botanical affinity remains in doubt. 



Occurrence. — Patuxent Formation. Fredericksburg, near Dutch 

 Gap, near Potomac Eun, Virginia. 



Collection. — U. S. National Museum. 



Genus ROGERSIA Fontaine 

 [Mon. U. S. Geol. Surv., vol. xv, 1890, p. 287] 



The present genus was characterized in the following terms by its 

 describer : 



" Leaves long, narrow, and willow-like, wedge-shaped at base, acute, 

 with a very strong midnerve and very slender primary nerves; these 

 go off very obliquely and diverge very slowly from the midrib, running 

 for a long distance nearly parallel with the margins of the leaves ; they 



