372 PROTOZOOLOGY 



Genus Diploconus 



6 large spines Family 3 Hexalaspidae 



Genus Hexaconus (Fig. 168, /) 



Suborder 2 Peripylea Hertwig 



Solitary; skeleton wanting or simple spicules; mostly spherical 



Legion 1 Collodaria 



Nucleus spherical with smooth membrane 



Vacuoles intracapsular Family 1 Physematiidae 



Genus Lampoxanthium (Fig. 169, a) 

 Vacuoles extracapsular Family 2 Thalassicollidae 



Genus Thalassicolla (Fig. 169, h) 



Nuclear membrane not smoothly contoured 



Nuclear wall branching out into pouches; structure similar to the 

 last Family 3 Thalassophysidae 



Genus Thalassophysa 



Fig. 169. a, Lampoxanthium pandora, X20 (Haeckel); b, Thalassicolla 

 nucleata, Xl5 (Huth). (From Kiihn.) 



Nuclear wall crenate 



Huge double spicule Family 4 Thalassothamnidae 



Genus Thalassothamnus 



A latticed skeleton, with branching and thorny spines 



Family 5 Orosphaeridae 



Genus Orosphaera 



Solitary; skeleton complex, often concentric. . . . Legion 2 Sphaerellaria 

 Central capsule and skeleton spherical Family 1 Sphaeroidae 



