167 



Fifteen species are known, of which the following on- 

 ly are mentioned by Lamarck. 



Limax rufus Limax cinereus 

 albus agrestis. 



i 



TESTACELLA. 



Sowerby's Genera of Shells, No. 1, pi. 6. 



This genus ofmollusca is called Testacellus, by Sower- 

 by ; it is nearly allied to the Limax and Parmacella, from 

 which, however, its organization differs, and it is also 

 immediately distinguished by a very small shell, which 

 covers a portion of the posterior extremity of the ani- 

 mal's body. It is nearly ear-shaped; slightly spiral at 

 the summit; the aperture very wide, oval, obliquely 

 enlarged, having the margin turned inwards. This a- 

 nimal, while living, remains generally beneath the sur- 

 face of the ground, and is seldom seen above. Lamarck 

 only mentions one species. Mr. Sowerby, however, has 

 discovered a second in the neighbourhood of London, 

 which he calls T. scutellum, and has given a very in- 

 teresting description of it in his Genera of Shells, No 2; 



