54 DESCRIPTIVE CATALOGUE 



V. 6597. A rather similar specimen, in which a considerable 

 number of pinna? (?) lie partly embedded in the matrix. 

 Iguanodon Quarry (Kentish Kag); nr. Maidstone. 



Presented by W. II. Bens ted, Esq., 

 transferred from Botanical Dept., 1898. 



Text-fig. 15.- " Cg&uteorackis," prenmisibly the rachis of si Bennettitalran 

 leaf, showing the strong central radii*. /.. fi">m which pinna 1 (?>./'., are 

 given off*. c., hollow cast in which the rachis lay. J nat. size. V. G(K> ( ,. 



Pseudo-genus CYQADEOMYELON, Saporta. 

 [i'aleont. Franc, , vol. 3, 1875, p. 331.] 



Diagnosis. " Medulla centralis ])rimnm substantial cellularis 

 disperditione evanida, dein sedimento cylindruin lignosum intus 

 vacuum cumnlonte snbstituta et tune post ligni circumt'utd 

 abolitionem cylindrura plenum plus minusve compressum fasci- 

 culorum meatunmque impiessionibus superficialiter notatum 

 effornmns." (Saporta.) 



While it is obvious that pith-casts alone do not represent a 

 true genus, nevertheless such entirely dc-lignified specimens are 

 exceedingly common in the Jurassic and Lower Cretaceous 

 deposits, and are much better described by such a pseudo- 

 generic name which both indicates their true nature and 

 affinity, than by such " generic " names as Rucklamlia. Fit- 

 tniua, etc.. which are often applied to. specimens showing leat'- 

 ba.ses us well, and cover a large number of different forms. 



