850 



MICROSCOPIC FORMS OF ANIMAL LIFE 



the difference in the number of rays is probably of no more account in 

 these low forms of animal life than it is in the discoidal diatoms. 

 Other discoidal forms, showing a like combination of radial and 

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

 in fig. 644, e, mi. 



FIG. 647. Various forms of Eadiolaria (after Haeckel) : 1, Etlunosphtera 

 siphonoj)Jiora ; 2, Actinomma inerme; 3, Acanthometra xipliicaittlia ; 

 4, Atucrmosphcera oligacantlia ; 5, Cladococcus viniinnlix. 



Entosphasrida. In this group the silicious shell is spheroidal, 

 and is formed within the capsule ; and it is not traversed by radii, 

 although prolongations of the shell often extend themselves radially 



