Berry: NOTES ON THE GENUS WIDDRINGTONITES 347 
sissima Fontaine, a Lower Cretaceous species of eastern North 
America. 
In all of these three species the epidermal cells are small, more 
or less rectangular, and thick-walled, as they are in Widdring- 
tonites subtilis. The stomata consist of a ring of from four to six 
radially arranged and more or less elevated guard cells. These 
cells are represented in Widdringtonites subtilis by the ring of 
accessory epidermal cells shown in FIG. 6, which occupy the same 
level as the rest of the epidermis, while lying below this level are 
the two stout guard cells, 
Frenelopsis ramosissima differs from the other two species of 
Frenelopsis previously mentioned in having certain of the epidermal 
cells spined, and Widdringtonites subtilis Heer curiously resembles 
Frenelopsis ramosissima in that the epidermal cells along the lateral 
angles of the leaf have more or less developed small spines, which 
Merease in length and size distad, as shown in FIG. 3a and 5a. 
A consideration of the sum of the known characters in the 
genera Widdringtonites and Frenelopsis leads to the conclusion 
that they are surely related. 
The combination of similar foliage, similar four-valved cones; 
similar epidermal and stomatal features in Widdringtonites 
and Widdringtonia render certain the reference of the Upper 
Cretaceous species Widdringtonites subtilis Heer to what repre- 
sented the modern subfamily Cupressineae during the Cretaceous. 
Jouns Hopkins UNIversity, 
BALTIMorE, Mp. 
and 
