DESCRIPTION OF SPECIES. 77 



character cannot be made out. It was evidently a fragment of a very large 

 plant of the same character as CtenopJiyllum grandifolium, and may possibly 

 be a portion of a very large specimen of this species. The leaf substance 

 was so thick, and the nerves so strongly defined and so remote, that at first 

 I supposed it to be the impression of the interior of the stem of an Equisetum. 

 The nerves, however, forking near the base, and a small part of the stem, 

 to which the leaflet was attached, make it plain that it is a portion of some 

 Cycad of very large size. 



This fragment seems to me to be a good deal like the large leaflet of 

 what Schenk calls Zamites distans, Presl., which he figures on plate xxvi, 

 fig. 10, "Foss. Flor. d. Grenzschicht." The large size of this leaflet, and 

 its strong and remote nerves, are points very similar to those of our plant 

 The only difference is the fact that Schenk's plant narrows towards the 

 base. 



Formation and locality. — Found only at Clover Hill, and there very 

 rarely in detached leaflets, in the sandstone with Clathropteris. 



PODOZAMITES, Fr. Braun, emend. 



Leaves of moderate size, midrib slender, leaflets distant, spreading, oblong-ovate, 

 and linear-oblong, obtusely acuminate, or rounded at the ends, and towards the base 

 sensibly narrowed, deciduous, supported on a short pedicel, pedicel articulated and 

 decurrent. Nerves dichotomous from the lowest part of the base of the leaflets, and 

 from that point simple, parallel, and converging towards the tips of the leaflets. 



The plants with this character are not very common in the Richmond 

 Coal Field, either in species or individuals. This scarcity, however, may 

 be more apparent than real, as the leaflets are so deciduous that they are 

 rarely found attached to the stems. The scattered leaflets are not un- 

 common. 



Podozamites Emmousi. 

 Plate XXXIII, Fig. 2. 

 Podozamites lanceolatus, Emmons. Am. Geol., Plate III, Fig. 7. 



Midrib strong, striate, leaves subopposite or alternate, elongate, elliptical, or lan- 

 ceolate in shape, abruptly narrowed at base into a very short pedicel, which is twisted 

 and decurrent on the midrib, nerves strong, and otherwise with the generic character. 



This fine plant seems to have been named by Emmons because he iden- 

 tified it with the Zamites lanceolatus, of Lindley and Hutton. It is really quite 



