THE RADIOL ARIA. 



83 



or " vacuoles," which, rhythmically, become distended with 

 water, und are then obliterated by "the contraction of the sur- 

 rounding protoplasm. But in the Artinophrys (or more 

 properly Actlnosphwrmm) JiJichor?rii (Fig. 4), the central 

 part of the piotoj)lasm is distinguished from the rest by con- 

 taining a number of endopiasts. It thus leads to the liadioht- 

 ria {Poly cist hia of Ehrenberg), the simplest forms of which 



Fig. a.— Arfinn^pho'.nmn Eirhhornii (after IIertwi<; and Lusscr, " Ucber Rhizopo- 

 rli'ii," Sc1iuI/.('"k Arcliiv,1876). 



T.--The eutirii animal ; c, c, contractile vacuoles. 



II.— Part of tho periphery much magnified ; a, a, a, psondopodia with Btiflf axial sub- 

 stance; w, nuclei or endopiasts. 



III.— A very yountr AcUnosphcBrium, with only two nuclei and two pseudopodia, 

 much magnified. 



consist essentiallv of a myxopod provided with filamentous, 

 radiating, and often anastomosing, pseudopodia. The centre 

 of the body is occupied by a capsule filled with protoplasm ; 



