156 



DESCRIPTIVE CATALOGUE 



also be made out (text-fig. 44). The pitting of the radial walls 

 cannot be detected in any of the sections. 



The medullary ray-cells are higher than the width of the 

 adjacent tracheidsin many cases, and many of the cells are radially 

 short, corresponding to about 2 or 3 tracheids. The end-walls 

 are vertical or at a very slight angle or curve. The radial 

 section of the medullary ray offers the only distinctive feature 

 in this wood. 



The one well-preserved feature of the specimen, viz., the 

 ubietinean thickening and pitting, particularly of (lie end-walls 



Text-fig. 44. Cedroxylon pottotiiense, sp. nov. Radial section of the 

 medullary ray, showing shape and arrangement of the cells and the 

 " abietinean pitting " of their walls. No. 13197 b. 



of the ray-cells, is a feature very seldom described in fossil 

 woods, and I do not know of any described species entirely like 

 the new fossil. In some respects probably Cedroxylon cedroides, 

 Gothan (1907, p. 23), comes nearer to it than other known 

 forms. 



V. 13197 a-C. Type-specimen. Three sections cut from the 

 specimen in the Sedgwick Museum, Cambridge. 



