266 DESCRIPTIVE CATALOGUE 



relatives among living plants. The large size of the pits on the 

 fibres may be a case in point. Again, the broad false rays of 

 some species of Almis may be a comparatively late acquisition " 

 (see Bailey, 1911). "In Magnoliaceae there are simple pits 

 between the vessels and the medullary rays, and I have not 

 seen any example with exclusively uniseriate rays. Otherwise 

 some members of this family rather resemble your plant." 



Viburnum lantana appears to be another species with which 

 legitimate comparison may be suggested ; but, as in the case of 

 four out of five of the other fossil Angiosperms here described, 

 no exact determination of its affinity can be made in the present 

 state of our knowledge of Augiosperm anatomy. 



V. 13231. Type-specimen. Figured, text-fig. 76. A large 

 block, measuring 25 x 5 x 23 cm., externally water- 

 worn. The wood was evidently much broken away 

 and teredo-bored before petrifaction. It is now 

 petrified in a very fine hard medium, in which the 

 wood-cells are locally exquisitely preserved. The 

 specimen is free from matrix and shows the woody 

 texture very clearly ; slightly weathered-out growth- 

 rings can be recognised by the naked eye. 



V. 13231 a. Figured, PI. XXVI, figs. 1 & 2. Transverse sec- 

 tion of part of the above block. The narrow limiting 

 /one of the growth-rings can be well seen in places. 

 Locally the numerous wood-vesM Is and ground-tissue, 

 us well as the uniseriate rays, are well petrified, 

 though, on the whole, the petrifaction in transver-e 

 section is not very good. 



V. 13231 b. A smaller transverse section similar to the above. 

 Toward the middle of the section the wood-fibres are 

 well enough preserved to show their thickened walls. 



V. 13231 c. Figured, PI. XXVIII, fig. 1 ; and text-fig. 77. 

 Radial longitudinal section showing a very large 

 number of medullary rays crossing the wood-elements. 

 The ray-cells are all thick-walled and are petrified 

 with remarkable beauty, showing their thickening, 

 pit-canals, etc., in many cases, as illustrated. 



