INDEX. 



PART III. 



UNIVALVIA TURBINATA. 



GENUS 7. TROCHUS. THE TOP. 



MARINiE. SEA. 



Trochus cinereus 



Plate. Fi's; 

 155 * 



GENUS 9. HELIX. 



* TERRESTRES. LAND. 



Helix Erica 

 »■ hispida 

 ■ rufesans 



iSi « 

 151 t 



157 « 



** FLUVIATILES. RIVER, 



Turbo trianfractus 



16S z 



GENUS 12. STROMBIFORMIS. NEEDLE SNAIL. 



Strombiformis albus 



177 



