1^ Rev. R. Sheppard's Account 



12. TUKBO ACHATINUS. 



Cyclostoma achatinum. Draparn. 



In great abundance, in the year 1820, on the beach at Felix- 

 stow, within the bay of Harwich, near to Languard-Fort, whither 

 they must have been brought from some fresh-water stream ; but 

 I have never detected it in a recent state. 



It is very distinct from T. viviparus ; is the Cyclostoma acha- 

 tinum of Draparnaud; and is unnoticed by Linnaeus. 



Is this the Helix compactilis of Dr. Pulteney ? If it be, the 

 habitat given by the Doctor is an erroneous one ; for he says it is 

 found in woods. 



13. Turbo tentaculatus. 

 Helix tentaculata. Trans. Linn. Sac. vol. viii. p. 220. 



Common in most rivers and streams. I have a specimen 

 taken by my valuable friend Mr. Kirby out of a small stream 

 near Lyndhurst in the New Forest, in which the lowest volution 

 but one is slightly decussated, the horizontal striae being the 

 deepest. 



The form of the mouths of this shell and Turbo viviparus war- 

 rants the withdrawing them from the genus Helix, and placing 

 them with Turbo elegans. They, with some others, form an ex- 

 cellent subdivision of the Lihnaean genus Turbo ; and Drapar- 

 naud includes them in his genus Cyclostoma. 



16. Turbo Leachii. 

 T. testa imperforata subovata, anfractibus 5 rotundatis oblique 



decurrentibus, sutura conspicua, apertura suborbiculari, 



operculo membranaceo. 



Habitat in rivis. 



Testa 3 lin. longa. If lin. lata, cornea, diaphana, glabra. An- 



fractus 5, teretes. Spira elongata. Apex acutus. 



A di- 



