378 



Systematic Paleontology 



leaf. The epidermal cells are arranged in rows; they are small in size 

 and thick-walled, quadrangular or slightly hexagonal in outline, rang- 

 ing from proportions but slightly longer than wide to those in which 

 the length is about 3 times the width. On the lower surface of the 

 leaf on either side of the midrib, commencing one-fifth of the distance 

 to the margin and occupying a width of one-fourth the distance to the 

 margin are the stomatal grooves. They are deeply sunken and appear 

 to have been floored with thin walled cells not well preserved. There 

 is some evidence of the occurrence of a woolly scurf in these grooves 

 but the preservation is such that this cannot be positively asserted. The 



Fig. 13. — ^View showing the whole midrib and the cuticle of one-half the 

 lamina of Cephalotaxopsis magnifolia, X 110. 



stomata were comparatively large and irregularly scattered in the floor 

 of the groove. They are without definite arrangement or orientation 

 as the accompanying figure well shows. The guard cells are two in num- 

 ber, long, much curved and slender. 



This species is exceedingly common in the Patuxent formation of 

 Virginia to which it appears to be confined in the coastal plain. Although 

 it has not yet been reported from the Kootanie formation of the Mon- 

 tana area, it is present in both the Lakota and Puson formations of the 

 Black Hills Eim and in both the Upper Knoxville and Horsetown beds 

 of the Shasta of California. At no localities, however, is it as abundant 



