192 THE FLOEA OF THE DAKOTA GROUP. 



Protophyllum Haydenh Lesq. 

 PI. XLIII, Fig. 1 ; PI. XLIV, Figs. 1, 2. 



Cret. Fl., p. 106, PI. xvii, Fig. 3 ; Cret. and Tert. Fl., p. 90. 

 Fterospermites Haydenii Lesq., Hayden's Ann. Rei)t., 1871, p. 302. 



Leaves coi-iaceous, variable iu size, long petioled, l)r(>a(lly ovate in i>ut- 

 liiie, truncate at base, obtuse at apex, mostly entire or sometimes reg-ularly, 

 deeply undulate or obtusely dentate, not peltate; nervation strong, deeply 

 impressed, craspedodrome ; lowest secondaries, of which there are two or 

 three pairs, thinner, nearly at right angles to the median nerve, less distant 

 than the others, nearly simple; those above jjarallel, equidistant, nine to 

 twelve pairs according to the size of the leaves, gradually more ol)liqu(' 

 upward, the lower liranching underneath, the upper simple or forking near 

 the borders. 



The leaves vary from 5™' to 16™ iu length, being generally as bmad at 

 the middle as long. The petiole is from 3""° to S"" long, not broader tliau 

 the base of the midrib ; the teeth of the borders are each entered by the 

 ends of the secondaries or of their branches; the surface is a little i-ugose 

 and traversed at riglit angles to the secondaries l)y deep, thin, simple, nr 

 forking undulate or curved nervilles, whose subdivisions into areoles are not 

 perceivable; the surface appears rather puuctidate than reticulate. 



This species ditfers from those described above by the absence of a 

 peltate or l^asilar boixler covering the upper part of the petiole. In this tlie 

 leaves resemble tliose of Credneria, from which they diifer by the straiglit, 

 craspedodrome nervation. The affinity of these leaves to those of P. Stertt- 

 heryii Lesq., or more especially to tliose of P. maltmervc Lesq., is so distinct 

 that they can not be placed in a different genus merely from the absence of 

 a peltate l)ase. It is, however, advisable to have the species of Proto})]i\'lluiii 

 separated into two groups, tliose with a peltate base, the others without it ; 

 these more eAndently related to Credneiia. 



Habitat: Ellsworth County, Kansas. Nos. 84, 110, 116, and 1S7 of 

 the museum of the University of Kansas; A. Wellington and E. P. West, 

 collectors. 



Protophyllum integerrimum Lesq., sp. (ined). 

 PL XLIII, Fig. 3. 



Prof. N. H. Winchell, Report of the Geological State Survey of Minnesota (inedited). 



Leaves coriaceous, thick, the surface jiolislied, round or broadly 

 elliptical in outline, rounded a.t the base and the apex, petioled, obscurely 



