XXXVI] 



CYCADEOIDEA 



387 



as Cycadites Saxbyanus from a specimen found by Mr Saxby at 

 Bonchurch in the Isle of Wight and represented by Wealden 

 examples from Brook Point, is chiefly interesting for the clear 

 preservation of the anatomical features of the stem. Three other 

 species were also described by Carruthers ; they are : Bennettites 

 maximus Carr., a large stem similar to B. Saxby anus, in the Museum 

 of the Geological Survey ; B. portlandicus from the Lower Purbeck 

 of the Isle of Portland, in the collection of the Geological Society ; 

 and B. Peachianus, a piece of a compressed stem, in the British 

 Museum, from the Upper Jurassic of Helmsdale in N.E. Scotland. 



Cycadeoidea (Bennettites) Gibsoniana. 



This species was founded on a petrified portion of a large 

 stem of Lower Greensand age discovered by Mr Gibson in Luccomb 



FIG. 517. Cycadeoidea Gibsoniana. A, transverse section of petiole showing 

 vascular bundles and ramenta; B, portion of A enlarged showing periderm 

 and ramenta. C, tangential section of stem with leaf-bases, ramenta (black) 

 and two flowers, 1, 2. (A, slightly enlarged, Manchester Collection, R, 1069; 

 C, after Carruthers.) 



Chine in the Isle of Wight : the type-specimen is represented by 

 pieces of the original block in the British Museum and in one 

 of the Museums at the Royal Gardens, Kew. The following 



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