262 HANDBOOK OF PROTOZOOLOGY 



Suborder 4 Tripylea Hertwig 



Without skeleton; with isolated spicules Legion 1 Phaeocystlna 



Skeleton consists of radial hollow rods and fine tangential needles 



Family 1 Aulacanthidae 



Genus Aulacantha (Fig. 107, a) 



With foreign skeleton covering body surface Family 2 Caementellidae 



Genus Caementella (Fig. 107, b) 



With skeleton 



One or two (concentric) usually spherical skeletons. .Legion 2 Phaeosphaeria 



Outer lattice skeleton with triangular or areolar meshes 



Family 1 Sagosphaeridae 



Genus Sagenoscene 



One lattice skeleton with hollow radial bars.. Family 2 Aulosphaeridae 



b 



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Fig. 107 a. Aulacantha scolymantha. XH (After Kiihn). 



b. Caementella stapedia. X65 (After Haeckel). 



c. Aulosphaera labradoriensis. X9 (After Haecker) (From Kiihn). 



Genus Aulosphaera (Fig. 107, c). 



Two 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, 108, a) 



Skeleton smooth or with small spines Family 2 Medusettidae 



Genus Medusetta (Fig. 108, h) 



