88 



DESCIUPTITE CATALOGUE 



characteristic thickening of the wall appears to be locally well 

 preserved. The pits in the lateral walls are rather irregular in 

 size and shape, but are principally roundish or oval, and are 

 disposed in groups of 2-4 per tracheid-field (text-fig. 21, nip.). 

 So far as I can determine, all the ray-cells are of this nature, 

 and, though some have much resinous contents and some appear 

 devoid of it (text-fig. 22), there seems to be no differentiation of 



rs. 



Text-fig. 22. Protopiceoxylon Edwardsi, sp. nov. Tangential view of the 

 wood, showing resin-canal, re., in slightly oblique longitudinal section ; 

 p., parenchyma surrounding it; rm., resin-containing cells of the 

 medullary r;>y ; rs., resin "spindle" in tracheid. (Slightly composite 

 drawing of V. 4859 I.) 



the elements. I can detect no ray-tracheids, but the end-cells 

 of some of the rays are very narrow and pointed. 



AFFINITIES. Regarding the inclusion of this species in 

 Oothan's genus, and consequently its affinity with his P. ex- 

 tuictum, there is no doubt; for the main feature, the presence of 



