522 PROTOZOOLOGY 



Genus Pipetta (Fig. 221, b) 



Central capsule and skeleton discoidal or lenticular 



Family 8 Discoidae 



Genus Staurocyclia (Fig. 221, c) 



Similar to the above, but flattened Family 9 Larcoidae 



Genus Cenolarus (Fig. 221, 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. 221, e) 



Central capsule of each individual enclosed in a latticed skeleton 



Family 11 Collosphaeridae 



Genus Collosphaera 

 Suborder 3 Monopylea Hertwig 

 Without any skeleton Family 1 Nassoidae 



Genus Cystidium (Fig. 222, a) 

 With skeleton 



Without a complete latticed skeleton 



Skeleton a basal tripod Family 2 Plectoidae 



Fig. 222. a, Cystidium princeps, X120; b, Triplagia primordialis, X25; 

 c, Lithocircus magnificus, X100; d, Dictyophimus hertwigi, X80 (Haeckel). 



Genus Triplagia (Fig. 222, b) 



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



Genus Lithocircus (Fig. 222, c) 



With a complete latticed skeleton 



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



Genus Dictyophimus (Fig. 222, d) 

 Lattice skeleton multiple Family 5 Botryoidae 



