28 



GINKGOALES 



[CH. 



while substituting Ginkgoites for Baiera, it is advisable to retain 

 Schimper's specific designation on the ground that the deep division 

 of the lamina appears to be the rule in the Wealden leaves whereas 

 in G. digitata the leaves are usually much less deeply dissected and 





B 



Fio. 643. Ginkgoites lobata (A) and Ginkgoites crassipes (B). 

 (Indian Geological Survey, Calcutta.) 



have broader segments. The largest specimen is one figured by 

 Ettingshausen with a lamina 7-5 cm. broad and 4-5 cm. deep ; 

 there is generally a deep median sinus and each half of the lamina 

 is subdivided into relatively narrow obtuse or truncate obeuneate 

 segments (fig. 635, B). Schenk^ describes the epidermal cells as 



1 Sohenk (71) B. p. 212, Pis. xxiv., xxv. fig. 7. 



