FOSSIL PLANTS. 469 



a close analogy with the species admitted by Brongniart as the type of his 

 genus Callipteris. When better known it may probably indicate the character 

 of a new genus. 



ALETHOPTERIS LONGIFOLIA, Brgt. 



Foss. Flor., p. 273, PL 83, fig. 2. 



The specimen, a fine one, represents the upper part of a pinna, with a broad 

 half round rachis, bearing alternate, horizontal, narrow, linear, simple pinnules, 

 attached to it by their whole base, but not connate, with entire or scarcely undu- 

 late borders. The nervation is exactly as figured and described by the author. 

 The leaflets are marked by round scars of son', placed near the border, one only 

 upon each middle vein ; the details of their structure cannot be seen, but they 

 greatly differ in form and position from those of Alethopterisemarginata, Gopp. 



Concretions of Mazon creek; r. Even. 



ALETHOPTERIS PENNSYLVANIA, Lesqx. 



Penn. Geol. Kept., p. 864, PL ii, fig. 1 and 2. 

 In the shales of Morris; Mr. S.. S. Strong. 



ASTEROCARPUS GRANDIS, Sp, HOV. 



UPPER end of a pinna, two inches long, a little more than 

 one inch broad at the broken base, evidently part of a large 

 frond. The lanceolate pinna is simply divided into alternate, 

 open, lanceolate, obtuse pinnules, one-fifth of an inch broad 

 at their connate base, and one-half of an inch long, with a 

 smooth surface or with merely an obscure medial nerve, with- 

 out other traces of nervation. The fructification is marked 

 by large starlike sori, placed near the borders of the pinnules, 

 four on each side, one at the top, with six to ten sporange-cells 

 pointed towards the center, obtuse to the outward. The form 

 of the sporanges is the same as in Asterocarpus Sternbergii, 

 Gopp., Foss. Farn., p. 188, pi. 6, fig. 1 and 2, but they are 



