82 



THE INVERTEBRATA 



sp. 



osc.~. 



Fig. 69. Radiolaria. A, Acanthometra elastica, after Hertwig. B, Aulac- 

 tinium actinastrum, after Haeckel. cps. central capsule; mph. myophrisk; 

 nu. nucleus; osc. oscula of central capsule; phae. phaeodium; ps. pseudo- 

 podium; sp. spine; y.c. yellow cells. 



