850 



MICROSCOPIC FORMS OF ANIMAL LIFE 



the difference in the -nnmber of rays is probably of no more account in 

 these lo\v forms of animal life than it is in the discoidal diatoms. 

 < >ther discoidal forms, showing a like combination of radial and 

 circumferential parts, are represented in figs. 649 and 650. and also 

 in fig. 644, e, m. 



^ ; mt% 



;p'f& - ( ;yi); (?fv'v" 



^;^f@:^t' 



A..<-^ 



^* Wr 



Y ' 



FIG. 647. Various forms of Kadiohu-ia (after llacckd) : 1, Etlniiosphcrra 

 r., />//<iuii/ili<>)-(i ; '2, ActiiKiiiinni iiii'niii' ; ;!, Accinthometrd xiphicantha \ 

 I, A.rnclinospli(BTa (>H</<-i<tltn ; .">, Cladococciis riniiniilin. 



Elltosphserida. In tlii- i--i-ou|) the siliciou* shell i> splicroid.-il. 

 and is formed u-itliin the capsule; and it is not traversed bv radii, 

 although prolongations of 1 he shell often extend themselves radially 



