CRETACEOUS FLORA. 21 



Protophylluni.] 



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 Jive 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. guadratum and P. multinerve Lesqx., Cret. Fl., PI. 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. 



Hub. Mankato, Minnesota. 

 Mus. Beg. No. 5666, 1 C. 



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 Cotton wood river. 



6064. Basilar part of a leaf of Aralia 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 FKOM MANKATO. 



5666, 1A. Platanus primceva, Lx., in fragments of leaves like those of Kansas. 



5666, IB. Fragment of a small oval, dentate? leaf, probably a Ficus; not determinable. 



5666, 1C. Protophyllum integerrimum, sp. nov. Counterpart of 5666. (?) 



5666, 2. Protophyllum inteyerrimum, sp. nov. Figured. 



5666, 3. Fragments of rootlets and branches ; nothing determinable. 



5666, 4. Fragments of a small leaf like 5666, IB. 



5666, 5a. Laurus plutonia Heer. Figured. 



5666 56. Protophyllum integerrimum Lx. Fragments figured. 



5666, 6. Rootlets and a dicotyledonous fragment ; all undeterminable. 



5666, 7. Protophyllum integerrimum Lx. 1C. Large leaf. 



5666, 8. Protophyllnm integerrimum. Only a small fragment. 



5666, 9. Protophyllum integerrimum, base of leaf. 



5666, 10, 11. Small undeterminable fragments. 



