CUPKESSrSOXXLON. 61 



paper on a species of Cvpressinoxylon from the Lower Greensand 

 of the Isle of "Wight. The chief characters may he summarised 

 as follows: — Annual rings very distinct. Tracheids^ wider than 

 those of Araucarioxylon Lindleii. Medullary rays composed of 

 long and narrow cells, consisting occasionally of more than twenty 

 cell-rows as seen in surface-view. Bordered pits occur either in 

 a single row (in which case they may be in contact or separate and 

 irregularly arranged) or frequently ia two rows; the pits of the 

 adjacent rows are either alternate or on the same level. No resin- 

 canals or resiniferous tissue. 



61,498. PI. VII. Kg. 1. 



Radial longitudinal section showing numerous narrow rings of 

 growth. This slice was no doubt cut from the same specimen as 

 51,495 and 51,496. The bordered pits often occur in a single 

 row, either contiguous or separate, or frequently in two rows, 

 the individual pits being placed alternately or opposite to one 

 another. The pits are circular or oval, and not polygonal, and 

 do not appear to exceed two rows on any one tracheid. 



Whitby, Upper Lias. Bryson Coll. 



51,496. PI. VII. Kg. 4. 



A transverse section 5 cm. in width, reproduced slightly less 

 than natural size. Annual rings (PI. VII. Kg. 6) clearly marked 

 and narrow, more abrupt than in Araucarioxylon Lindleii, and 

 characterised by a less gradual decrease in the diameter of the 

 spring tracheids as they pass into the narrow elements at the limit 

 of the rings. Medullary rays narrow and less distinct than in 

 the preceding species. 



"Whitby, Upper Lias. Bryson Coll. 



61,495. PI. VII. Fig. 6. 



Similar to the section shown in Kg. 4 ; the autumn wood is 

 composed of a few very narrow tracheids, which are succeeded 

 rather suddenly by much larger elements. 



Whitby, Upper Lias. Bryson Coll. 



Other specimens : — V. 328. Transverse section ; annual rings 

 well defined, from 1 to 2 mm. broad. Structure precisely the same 

 as in-51,495 and 61,496. 



Whitby. 



