ego TROCHUS. TOP, Class VI. 



6. fuscus. Lin. Tr. viii. 154. 



* Tr. with an umbilicated shell, and five mar- 

 gined volutions ; aperture nearly circular j mi- 

 nute ; inhabits the sea. 



Perhaps a variety of T. tumidus ? 



Common near Sandwich. 



** Imperforated, erect, umbilicus closed. 



7. crassus. Lin. Tr. viii. 154. Mont. Test. Br. 281. 



* Tr. with a somewhat ovate imperforated 

 shell; columella with one tooth; length one 

 inch, diameter nearly the same; inhabits the 

 sea. 



Found in abundance on the western coast 

 and elsewhere. 



8. papillo- Lin. Tr. viii. 155. Mont. Test. Br. 275. t. 10. 



sus. /. 3. 



* Tr. with an imperforated conic shell; volutions 

 rather plane, with two nodulated lines along each 

 volution ; base tumid. 



Cornwall, Poole, and Weymouth. 



