26 



17. LIMACELLUS obliquus. Shell small, very thick 

 and hard, variously formed, and rarely concave. 



Limacella obliqua. Brard, p. 148. t. 4./. 7, 8, 17, 

 18. 



Found in the common field slug, varying infinitely in 

 size and colours, but is easily distinguished by its 

 short keel, which is always placed obliquely. 



