DESCRIPTION OF THE SPEOIES. 303 



witli tliose of the primaries, and finally form the ultimate meshes, which are 

 irregular in form and size, quite lar^^c, and mostly subrhombic in form. 



Ijocality : Road-side near Potomac Run; very rare. 



"^IMie shajje and nervation of this leaf remind one strongly of Salix. 

 It has also a good deal of likeness to Peraoonia daphmides. 



Saliciphyllum ellipticum, sp. nov. 



Plate CXLVI, Fi','s. •->, 4 ; Plato CL, Fig. 8; Platfi CLXIII, Fig. 5; Plate CLXVI, Fig. 2. 



Leaves elliptical iu outline, small, broad in proportion to their length, 

 narrowed gradually at the base and summit, acute; midnerve strong at 

 base and attenuated at the summit; primary lateral nerves going oft" at a 

 very acute angle, arching strongly forwards; ultimate nervation not seen. 



Localities: P^ishing hut above Dutch Gap Canal; Fredericksburg; 72d 

 mile-post, near Brooke; rare. 



Angiosperms are very rare at the fishing hut above Dutch Gap Canal. 

 This fossil is the most common of those at this place. The leaf-substance 

 appears to have been (juite thick, and so was the epidermis, so that this 

 latter was quite durable. It was owing to this character of the leaf that 

 the finer nervation was concealed. 



Saliciphyllum parvifolium, sp. nov. 



Plate CLXXII, Fig. 5. 



Leaf very small, broadly elliptical, acute, narrowed at base and apex ; 

 petiole proportionally very strong, expanded below with a wing as if due 

 to stipules or to a clasping mode of attachment ; midnerve very slender, 

 lateral nerves going off very obliquely and curving upwards, only par- 

 tially seen ; ultimate reticulation not seen. 



Locahty: Covington street, Baltimore; found in only one specimen. 



CELASTROPHYLLUM (Etting sp.). 



Leaves small, ellii)tical in shape, margins toothed or entire ; midnerves 

 slender; primary nerves very slender, going oft' obliquely and pinnatel}', 

 curving up towards the apex, connected by comparatively strong nerves. 



