FAMILY 
Poe Cac | Ween 
OF LAMARCK, 
TROCHOIDEA 
OF CUVIER. 
Tue shells which compose this family are marine, not effuse 
in the aperture, having folds upon the columella. ‘They have 
long been blended with the Voturs, the Buximt, and of late, 
some zodlogists have also placed them among the AuricuLaz, 
to which they are closely allied ; nevertheless, they should be 
set apart on account of a distinction quite remarkable, the 
presence of an operculum. For this reason we should form a 
distinct family of them, which, according to Lamarck, is com- 
posed of only two genera, the TornaTELLa and the Pyra- 
MIDELLA. 
Tornatella. 4 
