FOSSIL COAL PLANTS. 



47 



Cuyahoga 



fine line runs from the apex of the nucleus to the summit 

 of the margin. 

 Roof of coal mines, Cuyahoga Falls. 



Nucleus ovate acuminate smooth, from ^ to 

 I inch in length, marked by a small cicatrix* 

 at base, and by a short elevated line which 

 passes through the aptex, extending to the dis- 

 tance of about 1 line toward the base. Margin 

 entirely surrounding the nucleus, conforming to 

 its outline, broadest at the summit, 



Bituminous shale immediately below coal. 

 Falls. 



Nucleus orbicular, ^ inch in diameter, [flat, 

 or a little raised, smooth, with a minute cicatrix 

 at base, entirely surrounded by a very narrow 

 border, which is narrowest at base. 



Shale over coal. Cuyahoga Falls. 



Nucleus ovoid acuminate, i inch long, flat, 

 smooth, with cicatrix at base, entirely surround- 

 ed by a margin, which is very narrow at the base, 

 is much j)rolonged bej^ond the apex of the nu- 

 cleus, and terminates in a rounded summit, which c.Eiongatum. 

 is sometimes emarginate. A line passes from the summit 

 of the margin into the apex of the nucleus. 



Shale over coal. Youngstown. 



Nucleus transversely elliptical or reniform, 

 flat, smooth, abruptly acuminate, without cica- 

 trix at base, surrounded by a very narrow mar- 

 gin, which is broadest at the summit. This is 

 probably the species figured by Sternberg, al- 

 though I have never seen a specimen from this 

 vicinity which was bicuspidate. As he has given no descrip- 

 tion with his figure, it is impossible to determine whether 

 his species is the same with ours. Both evidently belong 

 to the genus Cardiocarpon. 



Fis. 7. 



C. Bicuspida- 



tum. 



Carpolithes 



Bicuspidatus. 



Sterub. 



