128 



BICiyOPHl-LLIJM. 



main riLs. Both tlie specimens (Figs. 17 and 18) represent j-oimg^ 

 or at least small, leaves ; the examples of the form represented in 

 PI. XIII. Fifr. 3 belona; to much larcer leaves. 



Fig. 19. — B'lchidphijlliim rugosmn (L. & II.). From a specimen in the 

 Leekeiiljy CoUectiou, Cambridije (Xo. 13.5). (Nat. size.) 



Text-fig. 19. Lcekcnby Collection, Cambridge (Xo. 135). 



This .specimen is very similar to that of Fig. 17, but interesting 

 us showing part of the main framework of a frond with indistinct 

 traces of the laminar portion, in which the secondary and tertiary 

 veins are sufficiently indicated to enable one to recognize the 

 Bictyopliylhun characters. Identified by Phillips in 1873 as 

 PIdeho])tcris PhiUipsi. 



