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Geology and Natural History. 225 
was so gorged with large diatoms, such as Navieula viridis, 
together with desmids and conferve, that the existence of a 
nucleus could not be ascertained. The species may be distin- 
guished with the name of OURAM@BA VORAX. 
A 
Another Owrameba had two comparatively short tufts of rays, 
and a fourth, of smaller size than the others, had a single tuft of 
three moniliform rays. : : 
It is possible that Owramcba is the same as the Plagiophrys 
at Claparede, though the description of this does not apply to 
that, 
may be named D, crENULATA. 
In an old brick pond, on the grounds of Swarthmore College, 
Delaware County, among Difflugia pyriformis, D. spiralis, 
corona, D. acuminata, and others not yet determined, there occurs 
Sometimes the fourth of a line in th, and is comp: : 
form, but is quite variable in its relation of length to nice pm 
im the shape of the fundus of the she often trilobate, 
