PROTOZOA (tU SIMI'LKST AN'IM.V[,s. 



II 



coloured with crimson, blue and yellow tints, and have been w. 

 termed "gems of the ocean." Their skeletons a&sume an eii " 

 variety of beautiful and curious shapes, such ;i.s spiny lau. 

 spheres, rings, ])eehives, &c. The Radiujaria, (.f whidi alx)Ut 

 1,<»00 species iiavc l)eeu described, arc j.riinarily classified accordiii«^ 

 to the structure of the central capsule, the shajM- of the skelet<in 

 tending to conform, more (»r less, lo the shai)e of th.- latter. 

 Professor llaeckel divides the group into four Orders : - 



Fk;. 8.' 



IlaJiommd iryvillei. Magnifi('(l 200 (liiiiiictca-s. (After Wyvillc TIioiikmhi.) 



I. SpUMPiLiiARiA (Fig. 8), and see Plate VI I. and .Models ;i-1l> 

 in the Case, with spherical central capsule uniformly )H'rfcirate<l by 

 pores. Here the skeleton is typically formed of a latticed sphere or 

 of several concentric latticed spheres united by radial beams wliicii 

 do not penetrate the central capsule, and with radiate spines. 



o( 



' From "The Voyage of the (7«j//fH(/('c— Atlantir. 



