FOSSIL PLANTS. 447 



covered with densely imbricated oval, concave, somewhat 

 pointed leaves. It differs from the former by the shorter, less 

 concave leaves and short branches. Mazon creek ; a small 

 specimen. Same position as last. 



Genus Lycopodites, Brgt. Branches pinnately divided and 

 continuous ; leaves either placed all around the stem or dis- 

 tichous, in opposite series, scarcely leaving distinct cicatrices. 



Lycopodites asterophyllitcefolius, Sp. ndv. PI. 37, fig. 3. The 

 two branches figured are apparently from the same stem. The 

 long, linear, pointed leaves, placed all around the slender 

 branches are generally curved either upward or backward, 

 sometimes reflexed from the middle, apparently marked by a 

 medial nerve, thus resembling the leaves of Asterophyllites. 

 The scars left on the branches are only irregular points, with- 

 out any trace of a peculiar form. The leaves are apparently 

 sessile by their whole not enlarged base; the medial nerve is 

 scarcely marked. These branches could be considered as 

 belonging to some primeval species of coniferous trees, rather 

 than to Lycopodiacece. The communication of this remarkable 

 species is due to Mr. Joseph Even, who found it in an iron 

 nodule at Mazon creek. Position same as last. 



Genus Stigmaria, Brgt. Stems creeping or floating, horizon- 

 tal, two to four inches in diameter, sometimes very long, fork- 

 ing or dichotomous, with a generally eccentric cylindrical pith; 

 bearing around it long, leaf-like, cylindrical appendages, simple 

 or rarely forking, slightly contracted at the base, with a single 

 central vascular fascicle. Scars or bolsters more or less regu- 

 larly placed in spiral, round, with a double ring, and a single 

 elevated point (mamilla) in the middle. 



Stigmaria ficoides, Brgt. Mem. Hist. Nat., p. 82 and 88. 

 This species has the characters of the genus. It never 

 theless shows various forms, which have generally been con- 



