214 Di;sCl:IPTIV CATAU.C.ri, 



radial scries of tracheids, the maximum thickness of the rings 

 being about 2-5 mm. In specimens V. 5431 and V. 54(50 frag- 

 ments of a large-celled pzWt are preserved, but are too faulty 

 for description. In both these specimens and in V. 4870 

 (PI. XX, fig. 2) the size of the tracheids in the inner wood is 

 ratlier smaller than in the type, which is probably from an older 

 trunk. The wood is regular in texture ; many of the elements 

 are somewhat rounded at the corners, the majority of the 

 adjacent elements lying on alternate tangents so as to fit into 

 each other. This is well seen in PI. XX, fig. 1. Very few of 

 the tracheids contain resinous contents (text-tig. 60, H.). Wood- 

 'parencliyma cells with resinous contents are verv numerous, 

 and are scattered all through the growth-rings of the wood. 



^\n normal resin-canals and no traumatic canals arc present. 



Vniseriatc ;/?//'//"/// /v/>/.s are numerous, principally 1 to G 

 tracheids distant; in some parts of the wood the great 

 majority of the rays are only one tracheid di.-tunt. The rays 

 vary from 1 to about "2~> cells high, the great Majority of the 

 low rays being 3 cells and of the high ones about 13 15 cells 

 high. Among the ordinary rays, a iew show a slightly bi- 

 seriate character. These do not otherwise diil'er from the 

 normal rays. 



DKTA.ILS OF EI.KMKNTS. /. The majority of the 



elements of the growth-rings are of the shape and si/o of tho 

 summer wood (PI. XX, iig. 1 : text -tig. (in), and average about. 

 '.'>') r>5/*x3f>/<. In the rather narrow zones of autumn 

 wood, the compressed elements an; about. 1 tf 2<> // x '> ( > /, 

 in which the wall is thicker or the same thickness as the width 

 of the lumen. In transverse section there are large numbers 

 of beautifully preserved, large, bordered pits in the radial 

 Avails, and in the autumn wood numerous small bordered 

 pits are seen in the tangential walls. In radial view, the 

 majority of the elements have round bordered pits in single 

 rows (text-fig. 61); these are sometimes almost contiguous, 

 and sometimes at some distance from each other. The outline 

 of the border is often far from a perfect round, and uiay 

 have irregularity not due to crushing. In some elements 

 the pits lie in pairs (text-rig. 61, pp.}. In longitudinal 

 tangential section, the pits are small and round and numerous 

 (text-fig. 62, a.). " Sanio's rims " are more or lees well 



