DESCRIPTION OF SPECIES. 195 



PBOTOPHYLLUM PTEROSPERMIFOLIUM, Sp. IIOV. 



PI. LIX, Fig. 1. 



Leaves, small, coriaceous, nearly round, subcordate at base, narrowed 

 at apex, nearly entire or undulate-repand; primary nerve narrow, slig'htly 

 aulai-ged at the point of attachment of the lower secondaries, far above the 

 base, with two pairs of inferior ones passing at right angles from the mid- 

 rib and gradually decljiiing downward and branching; upper secondaries 

 six pairs, gradually more oblique above the lower, branching, all craspedo- 

 drome ; nervilles at right angles to the secondaries, rarely simple, mostly 

 forking at the middle, forming by subdivisions small, quadrate areoles. 



By the position of the two lower pairs of secondaries this leaf is related 

 to some of those referred by Heer to Pterospennites. But the prolongation 

 of the median nerve between two lower pairs of secondaries, inclining down- 

 ward and craspedodi-ome, refers it to Protophyllum. The relation of this 

 leaf is therefore multiple or not definite. It is comparable to P. Haydenii 

 Lesq. and P. intef/errlnmm Lesq., PI. XLIII, Figs. 1-3. 



Habitat: Kansas. 



Protophyllum quadratum Lesq. 



Cret. Fl., p. 104, PI. xix, Fig. 1. 



PUrospermites quadratus Lesq., Hayden's Ann. Kept., 1871, p. 301. 



Protophyllum rugosum, Lesq. 



Cret. Fl., p. 105, PI. xvii. Figs. 1, 2; PI. xix, Fig. 3. 

 Pterospermites rugosus Lesq., Hayden's Ann. Kept., 1872, p. 426. 



Protophyllum minus Lesq. 

 Cret. and Tert. Fl., p. 89, PI. iv. Fig. 6 ; Cret. Fl., p. 104, PI. xix, Fig. 2; PI. xxvii. Fig. 1. 



Protophyllum nebrascense Lesq. 

 Cret. Fl., p. 103, PI. xxvii, Fig. 3. 



Protophyllum? Mudgei Lesq. 

 Cret. FL, p. 106, PI. xvin. Fig. 3. 



Anisophyllum semialatum Lesq. 



Cret. Fl., p. 98, PI. vi, Figs. 1-5. 



Quercus semialata Lesq., Am. Jour. Sci. and Arts (series 2), vol. 46, 1868. p. 96. 



