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DIVISION II. Shell ovate, oblong. 

 Family 1st. Closed at both ends. 



Scientific name. 



Locality. 



Scientific name. 



Locality. 



Glauca, 



Spain and Britain. 



Egyptica, 



Red Sea. 



Ragusa, 



Med., Nicobar. 







Pellucida, 

 Fraa'ilis, 



Planata, 

 Lutraria, 



Family 2d. Gaping at the anterior end. 



Guinea. 

 Nicobar. 



Listen, 



Family 3d. Gaping at both ends. 

 Hians, 



Tranquebar, Britain. 

 Britain. 



Britain. 



Britain. 



