296 
SASSAFRAS (ARALIOPSIS) DISSECTUM SYMMETRICUM N. var, 
(Plate 236.) 
Differs from S. (A.) dissectum Lesq. Cret. & Tert. Fl. 57; FI. 
Dak. Gr. 101. p/. rg. f. 7, in its symmetrical branching, especially 
that of the lateral primaries, which start from the base of the leaf 
exactly opposite to one another and fork at an equal distance 
above ; also in the fact that the blade of the leaf is not decurrent 
along the petiole, but ends at the point where the lateral primaries 
branch from the midrib. 
I was at first inclined to describe this as a new species, but the 
imperfect condition of the upper portion of the specimen seemed 
to render this inadvisable, and its substantial agreement in essen- 
tial particulars with S. (A.) dissectum decided me to class it asa 
variety of that species. 
Cissires HEEr. 
This genus was founded by Heer, to include leaves presumably 
allied to Czsszs, but subsequently made by other authors to in- 
clude leaves having more or less resemblance to Vitis, Platanus, 
Sassafras, etc. 
CISSITES PLATANOIDEA Nn. sp. 
(Plate 237. f. 2.) 
Leaf symmetrical, 23¢ in. long by 23 in. broad, sub-orbicular 
to fan-shaped in outline, abruptly decurrent at base, obscurely 
3-lobed; margin undulate or obscurely dentate; nervation 3-pal- 
mate, craspedodrome; midrib abruptly thickened below the point 
where the lateral primaries branch off, also to a lesser extent be- 
low the point where the upper secondaries branch off; secondaries 
clustered together in two pairs above the middle of the midrib, 
the upper pair extending to the margins, the lower pair merging 
gradually into the tertiary nervation, of which it may perhaps be 
considered to form a part; the latter forming polygonal meshes, 
well defined; lateral primaries branched mostly from below, ob- 
scurely from above near the extremities and abruptly thickened 
below the point where the first secondaries branch off. 
This leaf is suggestive of species which have been described 
under the genera Sassafras (S. obtusum Lesq., etc.,) Platanus (P. 
Heeri Lesq., P. obtusiloba Lesq., etc.), Cissites (C. ingens Lesq., etc.), 
