196 Berry . — A Lower Cretaceous Species of 
of the family cannot be determined ; presumably there were differences, 
but these were probably not greater than those between the existing genera 
referred to this family. A restoration of the fossil drawn from the specimen 
figured in PL XII is shown in the Text-Fig., enlarged if times. 
Text-fig. Restoration of a frond of Schizaeopsis expama. if natural size. 
The species occurs in the oldest formation of the Potomac group, the 
Patuxent formation, which in age corresponds in a general way with the 
upper Wealden of Europe. The figured specimens come from Fredericks- 
burg, Virginia ; comparable, but more or less fragmentary, specimens have 
been found at a number of other localities in Virginia. The fern genus 
