170 DESCRIPTIVE CATALOGUE 



The species is based on branches from 2-8 cm. in diameter, 

 often showing pith, and on parts of much larger trunks. 



HOEIZON. Lower Greensand. 



LOCALITY. Shanklin, Isle of Wight. 



TYPE. Barber's description is based on a large number of 

 slides of several small stems and pieces of older ones, sections 

 of which are in Dr. D. H.Scott's private collection, East Oakley, 

 Hants, and in the Botany School, Cambridge. From among 

 these (which appear to represent not only CupressinoxyloH 

 vectense, but possibly also another species) Barber does not specify 

 any actual type-specimen. Slide marked " C.AL.B.I., A.C.S. ti " 

 (Barber, pi. xxiii, fig. 1) is most characteristic and may bo 

 regarded as the type-specimen, and is in Cambridge. 



DESCRIPTION. The species is based on a number of stems and 

 roots (?) described by Mr. Barber, averaging 2 - "> cms. in diameter, 

 and parts of the secondary wood of much larger stems. Many 

 of these show the pith and primary wood, as well as rin^s of 

 secondary wood; others consist only of portions of secondary 

 wood. All are preserved in the coarse green-grained matrix 

 which is characteristic of the Lower Greeusand deposit at 

 Shanklin; the silicified portions of the wood are dark brown. 

 In addition to Mr. Barber's specimens, other examples of the 

 species are contained in the British Museum collections, and 

 will be referred to in the following description. 



TOPOGRAPHY OF THE STEM. Thepi/7i in those stems in which 

 it is preserved is '9 mm. in diameter, approximately circular- 

 stellate, due to the projection of the primary bundles into it. 

 The elements comprising it are large, rounded, and apparently 

 uniform in structure, the size of the cells increasing towards the 

 centre. Primary bundles form about 15 well-marked groups 

 round the pith. 



In the secondary wood the growth-rings average 1-2 mm. 

 wide. These thicken at the exit of a branch (see PI. XV, fig. 1), 

 are very sharply marked, and have the peculiarity, on which 

 much stress was laid by Barber, of being composite. Thus the 

 narrow dark bands of " autumn " elements are duplicated or 

 triplicated in groups. This can be seen at ca. in text-fig. 48, 

 which is a reproduction of Barber's type, and in PI. XV, fig. 3, 

 in a more recently-discovered specimen in the Museum. 



The wood is uniform, small-celled, and adjacent elements on 



