DESCRIPTION OF SPECIES. 29 



compared also to ScMzoneura lyaradoxa Schimp. et Moug. (Triassic), as figured 

 by Heer/ a leaf which has the primary nerves or ribs much tliiuuer than 

 the specimen from Kansas. 



Habitat: Ten miles northeast of Delphos, Kansas. No. 407G of the 

 collection of Mr. K. D. Lacoe, of Pittston, Pennsylvania. 



Subtribe EUENOEPHALAETE^. 



Encephalartos cretaceus, sp. UOV. 

 PI. I, Fig. 12. 



Pinnules obovate-oblong, cuneiform at the base, round-pointed (!) at 

 apex (Ijroken); borders spinous-dentate; nerves thick, diverging, and dichot- 

 omous near the base, becoming gradually more distant and simple in the 

 upper part. 



This line leaf, of which the upper part is unhappily destroyed, so clearly 

 resembles those figured by Saporta^ that it seems to represent the same plant. 



The fragment is 9""" long, 4"" broad above the middle, has the sharply 

 pointed teeth of the border more or less distant, entered by the points of 

 the diverging nerves, which, averaging 0.5™" in thickness, become in the 

 upper part 1.5 to 2.5""" distant. The figures given by the author as a 

 portion of a frond and leaves characterize, according to him, the genus 

 Encephalartos of the Zamiere. Schimper describes the male and female 

 strobiles of the genus and says of the caude.x or stem that it is mostly 

 subterranean, ovate-cylincb-ical, bearing traces of squamiform loricate leaves 

 with rigid, prickly leaflets, entire, spinose, dentate or lobate on the borders, 

 the lobes being spinous. At the present epoch the plants of this genus 

 inhabit the austral regions of the American continent. 



The fragment figured here is not the first fossil referable to the genus 

 of the ZamiefB of our epoch. Saporta^ mentions the discovery of a large 

 frond of Encephalartos {E. Gorcelxianns Sap.) found in the Miocene of Koumi, 

 Euboea, the fronds of which measure nearly one metre in length and with 

 leaves lO*"" long. If the whole leaf of the Dakota Group specimen were 

 preserved it would be nearly of the same size. The species of Koumi is, 

 however, different in the borders of its leaves being entire. 



Habitat : Ellsworth County, Kansas. No. 47 of the Museum of the 

 University of Kansas. Collected by A. Wellington. 



'FI. Foss. Helv., p. 78, PI. xxx, Fij;. 2. 

 •Pal^ont. Fr., PI. Jnrass.,.Pl. Lxxiv, Figs. 1-3. 

 'Loc. cit., vol. 2, p. 337, etc. 



