RADIOLARIA 



421 



Genus Amphilonche (Fig. 195, e) 



With tangential skeletons 

 20 radial spines of equal size, shell composed of small plates, each 

 with one pore Family 6 Sphaerocapsidae 



Genus Sphaerocapsa 



2 or 6 larger spines 



2 enormously large conical sheathed spines , 



, Family 7 Diploconidae 



Fig. 195. a, Adinelius primordialis, X25 (Haeckel); b, Acanthociasma 

 planum, X65 (Mielck); c, Acanthometron elasticum (Hertwig); d. Acan- 

 thoma tetracopa, X40 (Schewiakoff ) ; e, Amphilonche hydrometrica, Xl30 

 (Haeckel); f, Hexaconus serratus, XlOO (Haeckel). 



Genus Diploconus 



6 large spines Family 8 Hexalaspidae 



Genus Hexaconus (Fig. 195, /) 



Suborder 2 Peripylea Hertwig 



Solitary, skeleton wanting or simple spicules; mostly spherical 

 Nucleus spherical with smooth membrane 



Vacuoles intracapsular Family 1 Physematiidae 



Genus Lampoxanthium (Fig. 196, a) 

 Vacuoles extracapsular Family 2 Thalassicollidae 



Genus Thalassicolla (Fig. 196, h) 



Nuclear membrane not smoothly contoured 



Nuclear wall branching out into pouches, structure similar to the 

 last Family 3 Thalassophysidae 



