RADIOLARIA 523 



Genus Phormobothrys 



Suborder 4 Triplylea Hertwig 



Without skeleton; with isolated spicules 



Skeleton consists of radial hollow rods and fine tangential needles 

 Family 1 Aulacanthidae 



Genus Aulacantha (Fig. 223, a) 



With foreign skeletons covering body surface 



Family 2 Caementellidae 





Fig. 223. a, Aulacantha scolymantha, X30 (Kuhn); b, Caementella 

 stapedia, X65 (Haeckel); c, Aulosphaera labradoriensis, XlO (Haecker). 



Genus Caementella (Fig. 223, b) 



With skeleton 



1-2 (concentric) usually spherical skeletons 



Outer lattice skeleton with triangular or areolar meshes 



Family 3 Sagosphaeridae 



Genus Sagenoscene 



One lattice skeleton with hollow radial bars 



Family 4 Aulosphaeridae 



Genus Aulosphaera (Fig. 223, c) 



2 concentric lattice skeletons connected by radial bars 



Family 5 Cannosphaeridae 



Genus Cannosphaera 



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

 Skeleton with fine diatomaceous graining . . Family 6 Challengeridae 



Genus Challengeron (Fig. 224, a) 

 Skeleton smooth or with small spines Family 7 Medusettidae 



