312 



DESCRIPTIVE CATALOGUE 



and are arranged in regular radial sequence, each tracheid 

 averaging 20-35 p in diameter. 



The cortex is very slender, and none of its tissues are well 

 enough preserved for description. 



The leaf -bases are laterally elongated rhomboids (text- 

 fig. 98, A, and text-fig. 100) measuring 3*5 cm. in transverse, 

 and about 1-5-1-8 cm. in vertical direction. Their rounded 

 surfaces are broken by cracks in the matrix, but there is no 

 indication of the number or character of the leaf-traces. 



AFFINITIES. It is evident that there is a very close likeness 

 to Cycadeoidta Yulesii (p. 299) 19 the general vegetative character 

 of this trunk. As there is no indication of fructification in 



Ttxt-Gg. 100. Outline sketch of the leaf-bases in ,\, Ci/cadeoidea Yatesii, 

 Carr., and B, C. bufantrJ^ntif, sp. nov., showing the contrast between 

 them both in size and shape, though they come from trunks of 

 approximately the same diameter. x ;;. A=Ko. V. 5217; B = 

 No. V. 6598.* 



either case, the species can only be provisionally diagnosed. 

 AVhile it is not impossible that C. buzzardemis may ultimately 

 prove to be an older form of C. Yatesii, there is a strong pre- 

 sumption against that conclusion in the fact that, in two 

 specimens of the respective species apparently of just about the 

 Bime size, the differences in the shape and size of the leaf-bases 

 and in the number of the vascular cylinders are conspicuous. 

 The extent of the differences between the types of leaf-bases is 

 indicated in text-fig. TOO, where the outlines are drawn from 



