482 CYCADOPHYTA [CH. 



and there would seem to be no reason for retaining both specific 

 names. The petiole-bases are usually sub-rhomboidal in form 

 and convex or flat, but in some stems more of each petiole is 

 preserved and the surface is covered with broad imbricate scales 

 (fig. 575) similar to some of the detached scales described under 



FIG. 575. Bucklandia anomala. (British Museum, No. V. 3690; 

 rather less than natural size.) 



the generic name Cycadolepis. Pith-casts occur both in connexion 

 with the Bucklandia stems and as detached specimens. The 

 leaf-bases often show an irregular zonation of smaller and larger 

 rhomboidal areas. The pith-cast in the lower part of the specimen 

 from the Wealden of Cuckfield in Sussex shown in fig. 575 is 

 5 x 3-5 cm. in diameter. 



