408 PALAEONTOLOGY OF ILLINOIS. 



inch long. This last character seems to unite this species to Ncuroptcris Schcuc7t- 

 zeri, Brgt., which the author considers as probably identical with Neuropteris 

 angusti-folia. I have lately received from Mr. S. S. Strong, and also in a con- 

 cretion from Mazon creek, a splendid specimen representing the top of a pinna of 

 Neuropteris hirsuta, Lesq., in the process of unfolding, or still curved in spiral, 

 whose leaflets, very hirsute on one side only, are narrow, linear lanceolate, and 

 unequal at base, exactly like the leaflets of JV. ctngusti-folia, Brgt. I am, 

 therefore, not yet satisfied that this last species is a distinct one, and still believe 

 that it may represent a form of N. Irirsuta, as it has been explained, Geol. Kept. 

 Penn., p. 857. 



Concretions of Mazon creek; from Mr. Even. 



NEUROPTERIS CRENULATA, Brgt. 



Foss. Flor., tab. 64, fig. 2. 



I refer with doubt to this species a specimen procured by Mr. S. S. Strong 

 from the concretions of Mazon creek. It represents the upper end of a pinna 

 bearing oblique, oblong, obtuse leaflets, attached to the rachis by the narrowed 

 base, forming a broad pedicel, and of the same form as those figured by Brong- 

 niart. The upper leaflets are simple, the lower ones compound, or bearing on 

 each side at their base a round, small, cyclopteroidal pinnule. The medial 

 nerve of the leaflets is obscurely inflated, the veins and veinlets are distant, 

 arched, distinct, not inflated, forking once or twice ; the borders are slightly 

 crenulate by a contraction of the epidermis at the point of the veinlets. Our 

 specimens agree well enough with some of this species obtained from Pennsyl- 

 vania, as also with the description of the author. There is, nevertheless, a dif- 

 ference especially marked by the division of the inferior leaflets with small 

 round pinnules at the base, like those of Neuropteris hirsuta, a division which 

 has not been heretofore noticed in this species. The teeth of the borders are 

 also less prominent and distinct on our own specimen. 



CALLIPTERIS SULLIVANTII, Lesqx. 



111. Geol. Rep., vol. ii, p. 440, PI. 38, fig. 1. 



Some specimens, in concretions from Mazon creek, show the lower divisions 

 of the pinnae more elongated, and pinnately cut-lobed, as in species of Alethop- 

 teris. This kind of subdivision would therefore indicate the place of this spe- 

 cies in this last genus, as admitted by Schimper, Paleont. Veget., p. 561. But 

 the peculiar nervation of this fine fossil fern, which is half neuropteroidal, has 



