538 



CYCADOPHYTAN FEONDS 



[CH. 



edge of the pinna; in the more linear pinnae the veins may be 

 parallel or nearly so. Zigno^ figured a piece of an Otozamites frond 

 from Jurassic Itahan strata in connexion with a Williamsonia 

 and the actual specimen in the Padua Museum amply justifies 

 the impression produced by the published drawing. Wieland's 

 investigations 2 in Mexico have brought to light many cases of 

 association of Otozamites fronds and Williamsonia flowers. 



A B 



Fig. 603. A, Otozamites Ooeppertianus. B, Otozamites obtusus (= 0. Bechei); 

 type-specimen. (A, British Museum, V. 2360; B, Oxford Museum.) 



The structure of the epidermis is partially described by Schenk^ 

 and more fully by Thomas*: the epidermal cells have sinuous 



2 Wieland (13). 



1 Zigno (85) PI. XLii. fig. 9. 



' Schenk (67) A. PI. xxxiv. fig. 7. 



« Thomas and Bancroft (13) p. 186 



PI. XIX. figs. 3, i. 



