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PROTOZOOLOGY 



"SPIT 

 Pfflg 



Fig. 219. a, Actinelms primordialis, X25 (Haeckel); b, Acanthociasma 

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

 thonia tetracopa, X40 (Schewiakoff ) ; e, Amphilonche hydrometrica, X130 

 (Haeckel); f, Hexaconus serratus, X100 (Haeckel). 



Genus Amphilonche (Fig. 219, 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 



Genus Diploconus 

 6 large spines Family 8 Hexalaspidae 



Genus Hexaconus (Fig. 219, f) 



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. 220, a) 



Vacuoles extracapsular Family 2 Thalassicollidae 



Genus Thalassicolla (Fig. 220, b) 



Nuclear membrane not smoothly contoured 



Nuclear wall branching out into pouches, structure similar to the 

 last , t ...... * Family 3 Thalassophysidae 



