RADIOLARIA 423 



Genus Pipetta (Fig. 197, h) 



Central capsule and skeleton discoidal or lenticular 



Family 8 Discoidae 



Genus Staurocyclia (Fig. 197, c) 

 Similar to the above, but flattened Family 9 Larcoidae 



Genus Cenolarus (Fig. 197, d) 



Colonial, individuals with anastomosing extracapsular cytoplasm, em- 

 bedded in a jelly mass 

 Without latticed skeleton, but with siliceous spicules arranged tan- 

 gentially to central capsule Family 10 Sphaerozoidae 



Genus Sphaerozoum (Fig. 197, e) 



Central capsule of each individual enclosed in a latticed skeleton 



Family 11 CoUosphaeridae 



Genus Collosphaera 





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Fig. 198. a, Cystidium princeps, Xl20; b, Triplagia primordialis, X25; 

 c, Lithocircus magnificus, XlOO; d, Dictyophimus hertwigi, X80 (Haeckel). 



Suborder 3 Monopylea Hertwig 



Without any skeleton Family 1 Nassoidae 



Genus Cystidium (Fig. 198, a) 



With skeleton 



Without a complete latticed skeleton 

 Skeleton a basal tripod Family 2 Plectoidae 



Genus Triplagia (Fig. 198, h) 

 Skeleton a simple or multiple sagittal ring. . . Family 3 Stephoidae 



Genus Lithocircus (Fig. 198, c) 



With a complete latticed skeleton 



Lattice skeleton single, without constriction. . . Family 4 Cyrtoidae 



