CLASS MOLLUSCA. 



tensity to sucli an extent as to render it impossible to 

 find two specimens of the same colour, is more commonly 

 found in fields than in aardens. 



Limox rufvis. 



There are many species of the Slug; but tliey are not 

 ucll defined, on account of the variable nature of their 

 colour; the black and the brown kinds are, however, 

 pretty well known : the black, in particular, is very de- 

 siiuctive in kitchen-gardens, and commits great havoc 

 in fields of cabbages and turnips. 



In one or two species, the buckler, or sn^.ooth space 

 near the head, contains a very small oval shell. 



There is a very singular species of Slug found in Tene- 

 rifle, under stones in moist places , it is not more than 

 an inch and a quarter in length ; it is called Limax 

 tioctihica, the night-shining Slug. The buckler, in this 

 species, is very narrow, and covered wiih pores, which 

 ex ude a kind of viscous substance, which has the property 

 of shining with a phosphorescent light, like that of the 

 glow-worm. 



We may have some idea of the rapid increase of Slugs, 



