26 



ZGOLOGT. 



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. IZ.—B, CoUaiphara x/n- 

 nosa, with i)rojectiiig conical 

 points, containing little sphe- 

 roids, which pass into monad- 

 like bodies C. D, probably on 

 early stage of C. A, a yonng 

 capsnle of C. Hvxleyi Mfuler.— 

 After Cicnkowslii. 



Fig. 1G.—Actinr«pheerium. a, a mor- 

 sel of food draw-n into the cortical layer 

 6; c, central parenchymatous mas.«"of 

 the body ; d, some balls of foodstuff in 

 the latter; e, pseudopodia of tlie cortical 

 layer. — After Gegenbaur. 



Fig. 17 .—Beliqphrys rariabilu. A sun 

 animalcule, showing the pscndopoda 

 nuclei, and vacuoles. — ^From Macallistec 



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.—Tk^^^ Rhizopods have the general 

 structure of Amoeba, but secrete beautiful silicious shells. 



