° CRETACEOUS FLORA. 21 
Protophyllum.] 
PROTOPHYLLUM INTEGERRIMUM, Sp. nov. 
PLATE B, FIGS. 10, 11. 
Leaves membranaceous, of medium size, round or broadly oval in outline, rounded at 
base and apex, nervation palmatifid ; craspedodrome ; lower lateral nerves two pairs, very 
open, nearly at right angle to the broad midrib, the upper five pairs oblique and parallel, 
all opposite and branching underneath, except the lowest. 
This fine species has distinctly the characters of the genus, but is remarkable 
for its very entire borders, nearly smooth surface and the secondaries all opposite. 
This opposition of the secondaries is more or less remarked in the leaves of Proto- 
phyllum, as in P. quadratum and P. multinerve Lesqx., Cret. Fl, Pl. XVIII and XIX. 
But there is generally some deviation from the rule in the lowest nerves, while in other 
‘species the opposition of all the nerves is perfect. The angle of divergence of the 
nerves is gradually more acute from the base upward; in these leaves, from the 3 
pairs of secondaries upward, the angle of divergence is the same, 40°. 
Hab. Mankato, Minnesota. 
Mus. Reg. No. 5666, 1C. 
Besides the specimens described above, there are, in fragments more or less uncertainly determinable 
the following species worth mentioning: 
6060. Mankato: nothing determinable. 
6061. Salix proteifolia Lx. Part of base. A species very variable and common in the Dakota group 
of Kansas, Nebraska, etc. 
6062. Leguminosites with nervation totally obsolete ; not determinable. 
6063. Diospyros? Fragment of undeterminable leaf; no nervation distinct ; same as 6068, and perhaps 
as 5372 of Big Cottonwood river. 
6064. Basilar part of a leaf of Avralia radiata? Lx., as far as can be seen, the lobes being destroyed. 
6065. Fragment of Ficus? 
6066. Same as 6062. 
6067. Poor fragment; possibly same as 6068. 
6068. Diospyros. Species not determinable ; nervation obsolete. 
6069. ‘Three specimens with very small fragments of dicotyledonous leaves ; not determinable. 
SPECIMENS FROM MANKATO, 
5666, 1A. Platanus primeva Lx., in fragments of leaves like those of Kansas. 
5666, 1B. Fragment of a small oval, dentate? leaf, probably a Ficus; not determinable. 
5666, 1C. Protophyllum integerrimum, sp. nov. Counterpart of 5666. (?) 
5666, 2. Protophyllum integerrimum, sp. nov. Figured. 
5666, 3. Fragments of rootlets and branches; nothing determinable. 
5666, 4. Fragments of a small leaf like 5666, 1B. 
5666, 5a. Laurus plutonia Heer. Figured. 
5666 5b. Protophyllum integerrimum Lx. Fragments figured. 
5666, 6. Rootlets and a dicotyledonous fragment; all undeterminable. 
5666, 7. Protophyllum integerrimum Lx. =1C. Large leaf. 
5666, 8. Protophyllum integerrimum. Only a small fragment. 
5666, 9. Protophyllum integervimum, base of leaf. 
5666, 10, 11. Small undeterminable fragments. 
