FOSSIL PLANTS. 



191 



and veinless, except in the centre, where there is some trace 

 of a mid-rib. 



Five species in the coal formation.* 



One species in the oolite formation, viz. : Mammillaria 

 Desnoyersii, of Brongn. Ann. sc. 4, t. 19, f. 9, 10. 



We subjoin a figure (128) of $. ficoides, Lindley and 

 Hutton, PL 34. 



FIG. 128. 



CLASS IV. PHANEBO&AMIC GTOOJOSPEEMS. 



Having figured those genera which occur most commonly 

 in the coal measures and other strata, we shall merely give 

 descriptions of most of the remaining plants, and, with one 

 or two exceptions, refer for the plates and other details to the 

 works of Brongniart, Sternberg, Lindley and Hutton, and 

 the Pictorial Atlas. 



9th Family. CYCADE^:. 



LEAYES ONLY KNOWN. 



Pteropliyllum, from nrfpov, a wing, and 0vXXoi/, a leaf, 

 Leaves pinnated ; leaflets almost equally broad each way, 

 inserted by the whole of their base, truncated at the summit $ 

 veins fine, equal, simple, but little marked, all parallel. 



Eight species in the lias and oolite. 



We subjoin a figure of P. comptum (fig. 129), with magni- 

 fied leaflet, Lindley and Hutton, PI. 66. 



Cycadites. One species in the grey chalk. 



Eight species in the oolite formation. 



* Pict. Atlas, pi. xxi. to xxiii. 



