RADIOLARIA 



375 



Fig. 172. a, Aulacantha scohjmantha, X30 (Kiihn); b, Caementella 

 stapedia, X65 (Haeckel); c, Anlosphaera lahradoriensis, XlO 

 (Haecker). (From Kiihn.) 



One lattice skeleton with hollow radial bars 



Family 2 Aulosphaeridae 



Genus Aulosphaera (Fig. 172, c) 



2 concentric lattice skeletons connected by radial bars 



Family 3 Cannosphaeridae 



Genus Cannosphaera 



One skeleton, simple, but variable in shape, bilaterally symmetrical 



Legion 3 Phaeogromia 



Skeleton with fine diatomaceous graining 



Family 1 Challengeridae 



Genus Challengeron (Fig. 173, a) 

 Skeleton smooth or with small spines. . . .Family 2 Medusettidae 



Genus Medusetta (Fig. 173, h) 



One skeleton; spherical or polyhedral, with an opening and with 



radiating spines Legion 4 Phaeocalpia 



Skeleton spherical or polyhedral, with uniformly large round pores 

 Family 1 Castanellidae 



Genus Castanidium (Fig. 173, c) 



Skeleton similar to the last, but the base of each radial spine 

 surrounded by pores Family 2 Circoporidae 



Genus Circoporus (Fig. 173, d) 



Skeleton flask-shaped with 1-2 groups of spines 



Family 3 Tuscaroridae 



