322 OBSERVATIONS ON MOLLUSKS. 



duals observed in this instance were in a torpid 

 state, and had stopped up the mouths of their 

 shells with a bung of sawdust and small chips of 

 wood cemented together. 



HELIX CARTHUSIANA.* 



IT is curious to observe any marked difference of 

 habit between nearly allied species. Some years 

 back, when collecting specimens of Helix carthusiana 

 on the south coast between Dover and Folkestone, 

 where this shell occurs in great plenty, I noticed 

 that on taking them up, and holding them between 

 the fingers for a few seconds, the animal, instead of 

 retiring within its shell from alarm, as is generally 

 the case with the helices when handled, invariably 

 protruded itself to its full length, remaining ex- 

 tended so long as it was kept in that position. I 

 never observed this in the case of the Helix cantiana, 

 or of any other of those species most nearly allied to 

 the Helix carthusiana. 



CYCLOSTOMA ELEOANS.f 



Jan. 8th, 1827. WHILST searching to-day for 

 fossils in Reche chalk-pits, we stumbled upon a few 

 dead shells of the Cyclostoma elegans, which lay scat- 

 tered over the rubbish that had weathered off from 



* Gray*s Manual, p. 146, pi. iii. f. 27. H.cartlimianeU(^ Drap. 

 t Id. p. 275, pi. vii. f. 75. 



