Maryland Geological Survey 507 



large leaf rather common in the Patapsco formation. Subsequently a 

 second species entirely unlike the iirst and equally obscure was tenta- 

 tively referred to the same genus, 



Aristolochi^phyllum crassinerve Fontaine 

 Plate XCVII 



AristolocMcBphyllum crassinerve Fontaine, 1890, Mon. U. S. Geol. Survey, 



vol. XV, 1889, p. 322, pi. clx, figs. 3-6. 

 AristolocMcephyllum crassinerve Fontaine, 1906, in "Ward, Mon. U. S. Geol. 



Surv., vol. xlviii, 1905, pp. 481, 504, 528, pi. cix, fig. 1. 



Description. — "Shape of leaf not seen; the leaves were apparently 

 large and rather coarse ; leaf-substance thick ; petiole and primary nerves 

 very strong and woody ; subordinate nerves strong and cord-like ; primary 

 nerves go off from the midnerve at an angle of about 45°, sweeping 

 around to form bow-shaped curves; they send off branches nearly at 

 right angles^ which anastomose to form irregularly shaped, strongly 

 defined meshes filled by an ultimate reticulation which is very distinct and 

 prominent, formed by nerves meeting nearly at right angles.^' — 

 Fontaine, 1890. 



Fragmentary remains of this esceedingly large leaf are not at all 

 uncommon in the Patapsco formation, but they are so very incomplete 

 that the general form of the leaf is not apparent nor are any speculations 

 regarding its botanical affinity likely to prove profitable. 



Occurrence. — Patapsco Formation. Fort Foote, Prince Greorge's 

 County, near Brooke, 72-mile post, and Hell Hole, Virginia. 



Collection. — U. S. ISTational Museum. 



Aristolochi^phyllum (?) cellulare Ward 



AristolocMwphyUum ? celluare Ward, 1906, in Fonta,ine, Mon. U. S. Geol. 

 Survey, vol. xlviii, 1905, p. 492, pi. cviii, fig. 5. 



Description. — "Apparently a large leaf of thick, fleshy texture. It 

 was probably rounded in form. The impressions show on their surface 

 a series of cell-like meshes, separated by narrow, raised, flat borders, 

 which appear to be the nerves of the leaf. The specific name of the 



