knowlton.] DESCRIPTION OF SPECIES. . 75 
middle lobe by broad, rounded sinuses; margin perfectly entire ; petiole 
short, rather thick; nervation palmate, three or four-bran eh ed, the 
middle branch straight, apparently passing directly to the apex of the 
middle lobe (broken), the other lateral nerves straight, ending below 
the obtuse apex of the lateral lobes; middle nerve with several pairs 
of opposite secondaries in the upper lobe, these curving upward and 
probably eamptodrome; nervilles rather strong, percurrent. 
This little leaf as preserved is 2.5 cm. in length, and was probably 
fully 3 cm. long when perfect. It is a little more than 2 cm. in width 
between the lobes, which are about 7 mm. in length. The petiole is 
about 4 mm. long and has the appearance of being entirely preserved. 
This leaf is very thin and delicate, and is made out with great diffi- 
culty, being of the same color as the matrix. The nervation, which ap- 
pears strong in the figure, is in reality very delicate. 
At first sight this little leaf appears identical with certain of the 
regularly three-lobed leaves of the common Sassafras sassafras (L.) 
Karst., but a closer inspection shows that it can hardly belong to that 
genus. The lobes of the sassafras are always acute, and the nerves 
which pass to them are never basal, but arise at some distance above 
the petiole. 
On the same piece of matrix with this leaf are numerous aquatic 
rootlets, but this may be only chance association. 
Habitat. — Point of Rocks, Wyoming. Colleeted by Lester F. Ward, 
September 2 and 3, 1881. 
Phyllites sp. 
PI. IX, fig. 4. 
Leaf elliptical-oblong, rounded regularly below (apex destroyed); 
margin entire, petiole strong, straight, passing evenly into the straight 
midrib; seeondaries opposite below, alternate above, curving slightly 
upward, apparently craspedodrome; nervilles strong, percurrent; finer 
nervation not preserved. 
This leaf is too fragmentary to permit of satisfactory diagnosis and 
disposition. It is cm. in length, including the petiole, which is 2 cm. 
long, and a little more than 3 cm. in width. 
Habitat, — Point of Rocks, Wyoming. Collected by Lester F. Ward, 
September 2 and 3, 1881. 
Phyllites sp. 
PI. XIX, fig. 5. 
Among the material from the Dutton Creek coal mine was a single 
piece of matrix in which three distinct plants were preserved — the 
one here figured, a Glyptostrobus, and a doubtful leaf of Populus. 
Since the drawings were made this speeimen was thrown away by an 
attendant. Without the speeimen before me for study, and depending, 
therefore, entirely on the drawing, 1 do not care to express an opinion 
