lesqueeeux.] ENUMERATION OF CRETACEOUS PLANTS. 333 



one fruit described as Prunus. I have recently received from M. Towner 

 a fruit of the same character upon a specimen bearing leaves of Aralia 

 Towneri. The Myrtiflorw, as well as the Leguminosm present by a num- 

 ber of species in the Greenland Cretaceous, have not been till now posi- 

 tively recognized from Kansas and Nebraska specimens. The few 

 groups not considered in this review have been remarked upon already 

 in the Cretaceous Flora, and the former views, in regard to the leaves 

 referred to them, have not been modified either by the remarks of Eu- 

 ropean authors or by the discovery of new materials. 



§ 2. Description and enumeration of Generic and Specific 



Divisions. 



With the descriptions of the new forms illustrated by the plates, 

 this part of the memoir contains an enumeration of all the species 

 established till now from the vegetable remains of the Dakota group, 

 with remarks suggested fyy the examination of the materials discovered 

 since the publication of the Cret. Flora*. In order to give to this 

 enumeration the value of a synopsis of this flora, I have added to the 

 specific names short descriptions, either copied in full or somewhat 

 modified from those of the same volume. 



For the discovery and the communication of the new materials, all 

 collected in Kansas, the thanks of paleontologists are due especially to 

 Messrs. Ch. Sternberg, of Fort Harker, H. C. Towner, of Clay Center, 

 and also to Prof. B. F. Mudge, of Manhattan. 



CBYPTOGAMOUS. 



THALLOPHYTES. 



ZONA.RITES dicitatus, Brgt., Cret. Flor., p. 44, PI. I, fig. 1. 



Frond flat, membranaceous, dichotomous, branching in an acute angle of 

 divergence; divisions as broad or broader than the main axis, linear, entire, 

 obtuse, slightly "enlarging upward. 



The reference of this species to that described by Brongiart from the 

 Oolithe is contested especially by reason of difference in the geological 

 station. 



FILICES. 



Lygodium trichomanoides, Lesqx., Cret. Flor., p. 45, PI. I, fig. 2. 



Pinna linear, from the truncate base to the middle, enlarged and lobed 

 upward by the forking of the middle nerve; veins broadly oblique, distinct, 

 simple or forking from the base. 



Hymenophyllum cretaceum, Lesqx., Cret. Flor., p. 45, PI. I, figs. 3, 4. 



Frond subcoriaceous, pinnw linear oblong, pinnately divided into oblan- 

 ceolate or cuneiform oblique pinnules, decurring to the convex, slightly 

 winged rachis, more or less deeply bi-trilobate ; lobes obtuse, simple-nerved. 



This, like the former species and Sphenopteris corrugata, Newby., are 

 contestable on account of the deficiency of the specimens. 



Pecopteris Nebraskana, Heer. Cret. Flor., p. 46, PI. XXIX, fig 5. 



Pinnce coriaceous, linear -lanceolate obtuse, alternately equally lobed; 

 lobes more or less disjointed, turned outside, obtuse ; middle vein thin, un- 

 dulating ; divisions alternate, ascending to the borders. 



* Report of the United States Geological Survey of the Territories, by Dr. F. V. Hay- 

 den, vol. vi, Cretaceous Flora (1874). 



