PROTOZOA OR SIMPLEST ANIMALS. 



13 



polar. The radiate spiues give off horizontal or tangential spines or High Wall 

 plates, which may remain separate (Fig. 9) or may fuse to form a ^^^® 

 latticed sphere (see Model 13 of Doratasjns diodon in the Case). GaUery" 



Til. Nassellaria. The central capsule is conical, and perforated 



Fig. 10.' 



Eucyrtidium cranioides. Entire animal as seen in tlie living 

 condition. Magnified 150 diameters. (After Haeckel.) 



only by a large opening in the basal region. Eucyrtidium (Fig. 1 0) and 

 Dictyopodiiim, see Models 14, 15 in Case, are beehive-shaped with three 

 segments. The yellow balls situated on the pink central capsule repre- 

 sent a symbiotic Alga, commonly found associated with Radiolaria. 



From •' Encyclopaedia Britannica. 



