36 



ZOOLOGY. 



ber, measures about one fiftji 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 Poraminifer, but 

 others regard it as more probably inorganic, and simply a 



Fig. 15.— S, CoUoiph(Era spi- 

 rwsa. with ijrojecting conical 

 points, containing little sphe- 

 roids, which pass into monad- 

 like bodies C. D, probably an 

 early stage of C. A, a young 

 capsule or C. Hvxleyi Muller.— 

 Ait«r Cienkowski. 



Fig. 16. — ActinnsphceHum. 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. 



Fig. 17. SeliophryavaricMlis. 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 cre- 

 taceous rocks are formed by their shells. 



Order 2. Radiolaria. — These Rhizopods have the general 

 structure of Amoebae, but secrete beautiful silicious shells. 



