FLORA OF THE DAKOTA GROUP. 89 



15 centimeters long, 13 centimeters broad between the lateral short broadly 

 obtuse lobes. The substance of the leaves is not coriaceous, rather thin 

 or membranaceous; the nervation not as coarse; the primary veins only 

 half as thick as in the preceding species. The medial nerve descends to 

 near the basilar margin before passing under it, and thus the tertiary or 

 marginal veins join the lower part of the medial nerve at right angles as 

 in Credneria; the upper secondary nerves, only three pairs, are very dis- 

 tant and oblique, not parallel nor equal in distance, and reach the margins 

 by their ends as craspedodrome while all their divisions are camptodrome. 

 The relation of this leaf to Platanus is quite distinct, as will be seen in 

 comparing it to P. Heerii, "U. S. Geol. Rep.," vi, pi. ix, fig. 1. 

 Hob. — Clay County, Kansas. H. C. Towner. 



Protophylluiii, Lesqx. 

 "U. S. Geol. Rep.," vi, p. 100. 



Protophylluiii Sternbergii, Lesqx. 

 Ibid., p. 101, pis. xvi, xviii, fig. 2. 



Protophyllum Leconteanum, Lesqx. 

 Ibid., p. 103, pi. xvii, fig. 4 ; xxvi, fig. 1. 



Protophyllum Nebrascense, Lesqx. 

 Ibid., p. 103, pi. xxvii, fig. 3. 



Protophyllum quadratuni, Lesqx. 

 Ibid., p. 104, pi. xix, fig. 1. 



Protophyllum minus, Lesqx. 

 Plate IV, Fig. 6. 

 Ibid., p. 104, pi. xix, fig. 2; xxvii, fig. 1. 



This species sometimes has the leaves very rugose and thus resembles 

 P. rugosum, which is, however, very different in the nervation, the large 

 size of the leaves, etc. 



Protophyllum multinerve, Lesqx. 



Ibid., p. 105, pi. xviii, fig. 1. 



From numerous specimens less fragmentary than the one figured the 

 leaves are seen to be round or transversely oval with borders entire. The 

 sizes vary, from 7 to 14 centimeters long and 9 to 18 centimeters broad. 

 The nerves are very close and numerous around the peltate base of the 

 leaves; above it they count 8 to 10 pairs, the lower forking generally once r 

 the upper simple. 



