168 THE POTOMAC OR YOUNGER MESOZOIC FLORA, 



The small fragment (Fig. 2) occurs in the plants collected by Meek at 



Baltimore, probably at Federal Hill. It is the smallest of the Potomac 



Anomozamitcs and may be a young form of some of those found in the 



Platypterigmm subgenus, for it shows no tendency to subdivision of the 



lamina. 



Anomozamites virginicus, sp. nov. 



Plate XXX, Fig. 4 ; Plate XXXI, Fig. 3. 



Leaves proportionally very long, of medium width, 37"™ wide, no 

 segmentation visible; the nerves are simple and go off nearly at right 

 angles, and near the margin curve slightly forward, thin, but distinct; leaf- 

 substance thin ; midnerve strong. 



Localities: Road-side near Potomac Run; near Telegraph Station; rare. 



The leaves of this plant are considerably larger than those of A. aii- 

 gustifolius. No tendency to segmentation is shown, and it maybe a young 

 form of one of the large Platypterigia. 



ANOMOZAMITES, subgenus PLATYPTERIGIUM, Schimper. 



Leaves lai'ge, up to two feet and more in length, and half a foot wide ; 

 lamina of the leaf thin, divided into segments of unequal size, that are 

 rounded or obtusely rliombic in shape ; nerves parallel, simple, and 

 forked; forms are rterophyUum Braimsii Schenk., P.pnncr.ps Oldham and 

 Morris, etc. 



This description of Schimper for the subgenus agrees well with cer- 

 tain large leaves that are rather common at Fredericksburg. Schimper 

 says that these leaves may be compared with the split leaves of Macrohji- 

 niopteris, and such I for some time took them to be, but was finally com- 

 pelled to think that the segmentation was not the result of accidental 

 fissuring. The individuals of the species of this genus are very much 

 more abundant than those of the species of Anomozamites proper. It is 

 peculiar that I could find no specimen showing the ends of the leaves, and 

 the base of the leaf also was never found. Parts of the middle portions of 

 the leaves were by far the most common. The plants collected by Pro- 

 fessor Uhler at Fredericksburg, and which were lost in transmittal to New 

 Orleans, contained a fine tip of one of these leaves. 



