440 PALEONTOLOGY OF ILLINOIS. 



tertiary rachis. In the specimens fig 2 and 4, the derm of the 

 leaflets is gone, and the nervation is perfectly distinct. All 

 the veins are oblique on the narrow midrib, arched and forked 

 once. In the large specimen, fig. 3, the derm of the leaflets is 

 preserved, and the indistinct veins appear simple and straight, 

 just as they are figured by M. Brongniart. All our specimens 

 are from Mazon creek, Grundy county. Coal No. 3. 



Aleihopteris stellata, Sp. nov. PL 34, fig. 4 and 4 a. Frond 

 pinnate; pinnse oblique, linear, obtuse or abruptly cut; mar- 

 gins undulate, decurrent along the medial nerve or common 

 rachis; primary and secondary veins pinnately branching; 

 veinlets simple, alternate, oblique, slightly arched, bearing at 

 their extremities, just on the border of the somewhat elevated 

 margin, a round, stellate, six-lobed sporange. I have figured 

 all that can be seen of this remarkable species, which should 

 perhaps be referred to the genus Asterocarjpus, Goj)p. It ap- 

 pears, nevertheless, more nearly related to Alet7iopteris cristata, 

 Gutb., from which it is essentially different by the decurrent 

 margin of the leaflets. The medial primary nerve is strong 

 enough, but the secondary veins are thin, straight, and ascend- 

 ing, without thinning, to the top of the leaflets. Fig. 4 a and 

 4 b show the enlarged form of the sporanges as distinctly as it 

 is possible to see it with a glass. Locality and position : same 

 as last. 



Genus Callipteris, Brgt. Frond bi or tripinnatifid ; pin- 

 nae long, decurrent on the common rachis ; pinnules continu- 

 ous, oblique, obovate or oblanceolate, united and decurrent at 

 the base; medial nerve thick, oblique or arched; secondary 

 nerves oblique, arched, dichotomous. 



Callipteris Sullivantii, Lsqx. PI. 38, fig. 1, and Geol. JRep. 

 of Penn., p. 866, tab. 5, fig. 13. This fine species was first 

 found at Shamokin, in the Anthracite coal fields of Pennsyl- 

 vania, in poor and broken specimens. ' From the numerous 



