506 Systematic Paleontology 



ProtewpTiyllum ohlongifolium Fontaine, 1906, in Ward, Mon. U. S. Geol. Sur- 

 vey, vol. xlviii, 1905, p. 538. 



FicopJiyllum tenuinerve Fontaine, 1906, in Ward, Mon. U. S. Geol. Survey, 

 vol. xlviii, 1905, p. 520 (non pp. 504, 510). 



Description. — " Leaf rather large, spatulate, oblong or oblong-ellip- 

 tical, narrowed very gradually below into the petiole; summit not seen; 

 midnerve stout, and continuing to near the tip of the leaf; secondary 

 nerves very slender, leaving the midrib at a more or less acute angle, 

 and arching around in an irregularly flexuous manner to unite with 

 those of the same order next above, sending off branches obliquely, 

 mainly on the outer side, which pursue a flexuous course parallel to 

 the margin of the leaf, finally dissolving into smaller branches; the 

 lateral nerves anastomose into large, irregular meshes, made up of 

 subordinate meshes, the minor branches of the lateral nerves, which 

 meet under large angles, forming a net- work that is very irregular; 

 leaf -substance moderately thick; the ultimate reticulation strong and 

 fern-like.'^— Fontaine, 1890. 



No new material representing this species has been collected and the 

 types of the various supposed species which represent variously pre- 

 served fragments of it are obviously from the same plant and are too 

 poorly preserved to repay refiguring. No evidence regarding its botanical 

 affinity is available. 



Occurrence. — Patuxent Formation". Fredericksburg, Dutch Gap, 

 near Dutch G-ap, near Potomac Eun, Virginia. Arundel Formation. 

 Arlington, Prince George's County, Mar^dand (1 doubtfully determined 

 specimen). Langdon, District of Columbia ( 1 doubtfully determined 

 specimen) . 



Collection. — TJ. S. National Museum. 



Genus ARISTOLOCHIAEPHYLLUM Fontaine 

 [Mon. U. S. Geol. Survey, vol. xv, 1890, p. 322] 



Leaves thick and of very large size with extremely stout and prominent 

 primary and secondary veins. Tertiaries thin but prominent. 



This genus of entirely unknown affinity except that it is undoubtedly 

 angiospermous was founded in 1890 by Fontaine for fragments of a 



