538 



CYCADOPHYTAN FRONDS 



[CH. 



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

 parallel or nearly so. Zigno 1 figured a piece of an Otozamites frond 

 from Jurassic Italian 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 Goeppertianus. B, Otozamites obtusus (= 0. Becliei); 

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



The structure of the epidermis is partially described by Schenk 3 

 and more fully by Thomas 4 : the epidermal cells have sinuous 



1 Zigno (85) PI. XLII. fig. 9. 2 Wieland (13). 



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



4 Thomas and Bancroft (13) p. 186, PI. xix. figs. 3, 4. 



