227 
and Parrotia (P. Canfieldi Lesq.), but is clearly distinct from any of 
these, and rather than erect a new genus I have decided to class 
it with C7sszfes and to indicate other characteristics in the specific 
name. 
CISSITES ACUTILOBA Nn. sp. 
(Plate 237. f. 3.) 
Leaf 234 in. long by 234 in. broad, sub-orbicular in outline, 
three lobed, lobes acute; nervation 3-palmate ; lateral primaries 
long, almost equalling the midrib, somewhat incurved, margin en- 
tire. 
Differs from C. Harkerianus Lesq., with which it is closely 
allied, in its more rounded outline, longer lateral primaries and 
acute lobes and apex. 
PROTOPHYLLUM Lesq. 
This genus was founded by Lesquereux to include certain 
leaves of an apparently synthetic type, some of which had been 
described under the genera Credneria and Pterospermites. The 
systematic position of the genus cannot yet be said to be defini- 
tely determined, although in Fl. Dak. Gr. /. c. it is classed in the 
Sterculiaceae. Whatever its systematic position may be there is 
no doubt that our species belongs to the genus as defined. — 
PROTOPHYLLUM QUERCIFORME nN. Sp. 
- 
(Plate 237, f. 1.) 
Leaf 3% in. long by almost 3% broad at middle, rhombic- 
vate in outline, rounded above, more or less abruptly narrowed 
from middle to base, slightly acuminate at apex; margin undulate- 
dentate; nervation craspedodrome; lower secondaries relatively 
Slender, crowded together, branching from the midrib at an obtuse 
angle; median ones stronger, more distant, branching from the 
midrib at a more acute angle, forked two-three times; upper ones 
again slender and branching as before at a more obtuse angle; 
tertiary nervation uniform, slightly curved outward, simple, fine, 
_ and at right angles to the secondaries throughout. 
This leaf somewhat resembles P. Haydenii Lesq., but differs 
in its smaller size, narrowed base and. more rounded apex. The 
Superficial appearance suggests one of our broad leaved oaks, as 
I have indicated in the specific name. 
