ZOOLOGY. 



her, measures about one fifth of an inch in diameter. Most 

 of our native species are much more minute. The Eozoon, 

 so-called, is supposed by some to be a Foraminifer, but 

 others regard it as more probably inorganic, and simply a 



Pig. 15. B, Collosphcera spi- 

 nosa. with projecting conical 

 points, containing little sphe- 

 roids, which pass into monad 

 like bodies C. D, probably an 

 early stage of C. A, a. young 

 capsule of C. Ihixleyi Miiller. 

 After Cienkowski. 



Fig. IG.Actinospfueriiim. a, a mor- 

 sel of food drawn into the cortical layer 

 b; C, central parenchymatous mass of 

 the body ; d, some balls of food-stuff in 

 the latter; e, pseudopodia of the cortical 

 layer. After Gegenbaur. 



Pig. n.Heliophrysrariabilis. A sun- 

 animalcule, showing the pscudopods, 

 nuclei, and vacuoles. From Macalhstcr. 



mineral. Undoubted Foraminifera occur in the Silurian 

 formation, Avhile large masses of carboniferous and cre- 

 taceous rocks are formed by their shells. 



Order 2. Radiolaria. These Ehizopods have the general 

 structure of Amoebae, but secrete beautiful silicious shells, 





