SYNOPSIS GENE RUM. 11 



Family 12. Convoluta. 



Erato. Terebellum. 



Cyprsea. Conus. 



Ovula. 



Class IV. PTEROPODA. 



Class V. CEPHALOPODA. 



Older I. POLYTHALAMIA. 



Family 1. Foraminiferd. 



Orbiculina. Textularia. 



Spiroloculina. Nodosaria. 



Polystomella. 



Family 2. Siphonoidea. 

 Spirula. Nautilus. 



Order II. Monothalamia. 

 Argonauta. 



c2 



