272 WARD 



involucral bract scars in several rows passing into leaf scars, central 

 portion solid, heterogeneous; ai-mor 2-4cm thick, joined to the axis by 

 a definite line; wood 2-4cm thick; cortical parenchyma icm thick; 

 fibrous zone i-3cm thick, consisting of two or three rings, the outer 

 ones showing radiate structure; medulla either circular and 4cm in 

 diameter or elliptical in cross-section, the lesser diameter 2-4cm and 

 the greater 3-8cm. 



After considerable hesitation I have decided to group together seven 

 of the specimens under this name, although, from different states of 

 preservation and degrees of compression, they present a somewhat 

 varied aspect. They all agree, however, in the one leading character 

 of being more or less densely covered with small protruding secondary 

 axes which greatly obscure and distort all other characters. I name 

 the species from this character, using the word nodosa in its primary 

 and more correct sense of knotty or full of knots, and not in the sec- 

 ondary and less correct sense which most naturalists give it of Jointed^ 

 which should properly be expressed by the Latin word articulatus. 



The specimens referred to this species, with their weights are as 

 follows : 



No. 500.9, 2.41 kilograms. 



♦' 500.11, 1. 14 



" 500.12, 0.87 



" 500.17, 2.55 



•' 500.21, 2.12 



" 500.47, 2.35 



•* 500.48, 1.25 



With the exception of No. 500.21, these are all nearly perfect trunks. 

 That one seems to be only the upper part of a trunk larger than the 

 rest, but it is impossible to decide how much more there was below 

 this, and in fact the base may not have been far away. In that case it 

 would have had a low, vertically flattened form, which is different 

 from the rest. No. 500.9 is considerably larger than the others and 

 has fewer branches, but it cannot be referred to any other group. Nos. 

 500.11, 500.12, and 500.48 are all smaller and have about the same 

 general facies. I would make Nos. 500.17 and 500.47 the types of 

 this species. They are very similar in all respects and display the 

 specific characters to good advantage. They are much less distorted 

 by pressure than the other specimens. 



CYCADELLA CIRRATA n. sp. 

 Trunks of medium size, short-cylindrical, rounded at the summit, 

 somewhat laterally compressed, unbranched; rock rather hard, drab 



