304 



DESCRIPTIVE CATALOGUE 



is presumably phloem ; when weathered or very slowly eaten 

 out with acid, the difference in texture between this zone and 

 the wood is apparent (text-fig. 95, ph.?). 



The cortex is a very narrow zone ; where the leaf-bases are 

 broken away, it is deeply corrugated with lenticular grooves 

 (text-fig. 93, area c). 



Text-fig. 97. Cycadeoidea Yalcsii, Carr. Surface-view of a specimen 

 showing the regular squarish leaf-bases. Nat. size. No. V. 9383. 



The leaf-buses are not massive, in a radial direction measuring 

 only about 2 cm. They vary somewhat in size, but are typically 

 almost square in surface-view, measuring about 1*8-2 x 1*6-2 

 cm. in horizontal and vertical diameters. This shape and 

 appearance is largely due to the covering zones of ramentee (?) 



