MOLLUSCA. 161 



months. When forced out for examination at the 

 end of thirty or forty days, some appeared without 

 any marks of renewal ; but in others, especially 

 when the weather was warm, a fleshy globule, of a 

 greyish colour, was observed about the middle of 

 the trunk. 



No particular organization was noticed in 

 this globule, but in eight or ten days it became 

 larger rudiments of lips, mouth, tongue, and the 

 smaller horns appeared, then gradually developed, 

 and in the course of two or three months the injury 

 was so completely repaired, that the new head could 

 only be distinguished from the old one by its lighter 

 colour. 



These experiments have been confirmed by 

 Bonnet, Schceffer, Gerordi, and others. 



Snails have been divided into two genera, in 

 one of which (Slugs) the animals have no shell. 

 The large slug (Limax maximus, L.), whose body is 

 grey spotted with black, is frequently seen in damp 

 cellars, gardens, etc.; and the small slug (L. agresiis, 

 L.), after summer showers, in kitchen gardens. 

 These have not yet been turned to much account 

 by man; on the contrary. But the red slug (Arion 

 rufus, L.) is still used in country places for cough 

 mixtures, etc. 



The Snails, properly so called, belong to the 

 genus Helix. Of them 1 have spoken at length ; 



M 



