94 The Shell-Collector’s Handbook. 
till lately associated as a variety. It may, however, be | 
distinguished by the following characters: The mantle is 
unicolorous and without markings; the pulmonary aper- 
ture is margined with the same colour as the ground 
colour of the body, but of a deeper tint; the keel is 
generally of a different colour from the rest of the body ; 
and the sole is divided into three longitudinal bands, the 
middle one being white, and the two lateral ones dark. 
Habitat.—Gardens and fields. 
v. nigra (Mogqg.): Animal black, unicolor. 
