FORAMINIFERA AND RADIOLARIA. 



Ill 



PLATE XV1IL 



FtO. 1. FlO. 2 



Fro. 3. 



VARIOUS FORMS OF poLYCYSTiNA (after Ehrenberg). 



Fig. 1. Podoyrtis Schomburgkii. 



2. Rhopalocanium ornatum. 



3. Haliomma hystrix. 



4. Pterocanium, with animal. 



