182 



THE FOSSIL TEENS. 



FIG. 115. 



We shall now give a brief description of the most common 

 genera, with the figure of a typical species.* 



PachypteriSj from TTO^VJ, thick, and irrepis, a fern. 



Leaves pinnated, or bipinnated, leaflets 

 entire, coriaceous, ribless, or one-ribbed, 

 contracted at the base, but not adherent 

 to the mid-rib. 



Two species only have been discovered ; 

 in the oolite formation. 



The accompanying is a figure (115) of 

 P. lanceolata^ from Brongniart, PL 45. 



SpJienopteris^ from O-^T/J/, a wedge, and 

 TTTfpiS) a fern. 



Leaves bitripinnatifid ; leaflets con- 

 tracted at the base, not adherent to the 

 rachis. Lobed; the lower lobes largest, 

 diverging, somewhat palmate ; veins bipinnate, radiating, as 



it were, from the base. 



We give, as an example, 

 the S. crenata (fig. 116), from 

 Lindley and Hutton, PI. 39. 

 The species amount to about 

 thirty-six. 



Cyclopteris^ from KVK\OS, a 

 circle, and -rrrepis, a fern. 



Leaves simple, entire, and 

 somewhat orbicular ; veins 

 numerous, radiating from the 

 base, dichotomous, equal ; 

 mid-rib wanting. 



One species in the tran- 

 sition rocks. 



Pour species in the coal. 

 One species in the oolites. 



FIG. 116. 



* Pictorial Atlas of Organic Remains : H. G. Bohn. This splendid volume 

 contains seventy-four beautiful illuminated plates, containing nearly nine 

 hundred figures, selected from Parkinson's Organic Remains and Artis' Ante- 

 diluvian Phytology, with descriptions by Dr. Mantell. As this Atlas will prove 

 eminently useful to the student, we shall make constant reference to the plates 

 io the following pages. Pict. Atlas, pi. iv., figs. 1 7. 



t Pict. Atlas, pi. iv., figs. 3, 4 ; pi. v., fig. 2. 



PI. v., fig. 5 ; pi. xxix. 



