Tafel HI. 



t 

 i 



Pedalcommissur. 



Visceralcommissur. 



Subceiebralcommissur. 



Cerebropedalcommissur. 



Cerebro visceralcommissur. 



Visceropedalcommissur. 



Parapedalcommissur. 



Fig. 10 



Fig. 11 



Fig. 12 



Fig. 13 



Umbrella mediterranea Lam. 

 Gastropteron Meckelii Kosse. 

 Philine aperta L. 

 Bulla ampulla L. 



