141 
AURICULA. Lam. 
Gen. Char. An univalve ovate or oblong pyra- 
midal shell with an elevated spire; aperture 
oblong, entire, contracted above with united 
lips ; columella plaited, independently of the 
decurrent attachment* of the outer lip 
In general, shells that have plaited columelke have 
also beaked, or at least notched, apertures. The 
Genus Auricula has been established to receive such 
as form an exception to this rule, and are not tur- 
reted, having entire mouths and plaits on their colu- 
mellas; Bruguiere had separated them from the 
Volutae of Linn, together with others that had no 
plaits, and formed the Genus Bulimus from which 
Lamarck has judiciously separated them. The spire 
seldom equals in length the last volution ; Lamarck 
observes, that the species are mostly inhabitants of 
rivers ; they are often decorated with various 
colours, are polished and transversely striated. 
* In the Genus Lymnaea a plait is formed on the columella by this 
part of the outer lip. 
VOL. II. 
