AE.ION ATER. 



2. hortensis. Animal slender, one to two inches long, mostly- 

 grey or yellowish, more or less striped with blue-black, inte- 

 guments rising into leaflets. Shell represented by calcareous 

 granules, agglomerated into a subhemispherical form. 



1. Arion ater. Black Avion. 



Animal ; body stout, from three to five inches in length, extremely 

 variable in colour, but mostly of a deep chocolate-red or olive- 

 black, integuments tessellately wrinkled throughout with short 

 swollen ridges or tuberosities ; margin of the foot expanded, 

 generally yellowish or orange, radiately lineated with black or 

 fuscous red ; head stout, marked with two dark lines between 

 the tentacles, which are livid blue-black ; shield minutely granu- 

 lated. 



Shell ; represented by calcareous grains, sometimes isolated, some- 

 times rudely agglomerated. 



