168 



YATESIA. 



specimens from the French beds are in a better state of 

 preservation, and admit of a more complete diagnosis, than the 

 English examples. 



Fig. 9. Cf. Yatesia Morrisii (nat. size). (Y. 26105.) 



V. 26105. Fig. 9. 



Leaf bases very prominent and considerably waterworn 

 (Fig. 9, a and 5). At the upper end of the specimen, as seen 

 in Fig. 9, the outer surface of the wood is exposed ; in a view 

 of the transverse section (Fig. 9c) there is seen to be a single 

 ring of wood, with the bundles separated by broad primary 

 medullary rays, the spaces in the structureless cast representing 

 the xylem bundles. The small development of wood points to 

 a young stem, in which no second cambium had been formed. 

 Cf. Carruthers' figures of T. Horrisii (pi. Iv. figs. 3, 5, and 6). 1 

 Sussex. Heckles Coll. 



Carruthers (1). 



