420 PALAEONTOLOGY OF ILLINOIS. 



of this plant. They are placed without any kind of order, crossing each other 

 in various directions, as if they had been strewn on the stone, and therefore 

 the kind of divisions marked in the figure, and abnormal, if this plant belongs 

 to a fern, may be merely caused by the casual superposition of two branches 

 joined by their bases. The form of the leaves, their peculiar position along 

 the stem on the same side of it, resembling the divisions or lobes of some ferns, 

 and their mode of attachment, indicate the close relationship of this plant to 

 those published by Prof. Brongniart as Pachypteris. In some of our branch- 

 lets the basilar prolongation of the pinnules along the rachis ? of the pinnae 

 has become detached by compression, and they appear in that way as bearing, 

 at the base, a long, linear auricle. The pinnules are a little enlarged to the 

 very obtuse point, as seen in fig. 8, enlarged four times, and in fig. 7, enlarged 

 twice. 



On shale, from Morris, collected by Mr. Jos. Even. 



LEAVES OF UNCERTAIN OR UNKNOWN AFFINITY. 



GENUS CORDAITES, Ung. 



111. Geol. Rep., vol. ii, p. 443. 

 CORDAITES ANGUSTIFOLIA, Sp. MOV. 



The roof of the main coal at Duquoin and St. Johns is in 

 places covered to a thickness of six inches to one foot, with 

 remains of flat, narrowly equally striate, long linear leaves, 

 one to one and a-half inches broad, which, as yet, have not 

 been found in connection with any stem. 



From their linear form and from the narrow striae marking their surface, I 

 refer these leaves to the genus Cordaites, Ung., being unable to see the char- 

 acters which separate these ribbon-like leaves into two genera, viz. Cordaifes 

 and Noeggerathia. 



