26 



ZOOLOGY. 



ber, 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 



Fig. 15. B, Coltotph&ra spi- 

 nosa. with projecting conical 

 points, containing little sphe- 

 roids, which paps into monad- 

 like bodies C. D, probably an 

 early stage of C. A, a young 

 capsule or C. Hiixleyi Miiller. 

 After Cienkowski. 



Fig. 1C. ActinospfKerium. a, amor- 

 eel or food drawn into the cortical layer 

 b; c, central parenchymatouB mass of 

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

 the latter; e, pseudopodia of the cortical 

 layer. After Gegenbaur. 



Fig. Vt.Heliophrysvariabilis. A sun 

 animalcule, showing the pseudopods 

 nuclei, and vacuoles. From Macallister, 



mineral. Undoubted Foraminifera occur in the Silurian 

 formation, while large masses of carboniferous and ere' 

 taceous rocks are formed by their shells. 



Order 2. Radiolaria. These Rhizopods have the general 

 structure of Amoebae, but secrete beautiful silicious shells, 



