INDEX, 



PART III. 



UNIVALVIA TURBINATA. 



GENUS 7. TROCHUS. THE TOP. 



MARINE. SEA, 



Trochus clnercus 



Plate. Fig; 

 155 * 



GENUS 9. HELIX. 



* TERRESTRES. LAND, 



Helix Erica 

 i hispida 



- ■ rufesctns 



15* 

 IS* 

 157 



** FLUVIATILES. RIVER, 



Turbo trianfractus 



i6S l 



GENUS 12. STROMBIFORMIS. NEEDLE SNAIL. 



Strombiformis albus 



177 



