101 
ACTEON. Montfort — Leach , 
Tornatella Lamarck . 
Gen. Char. A convoluted, elongated, uni- 
valve, with a projecting spire; aperture ob- 
long, entire, with a sharp edged lip ; colu- 
mella furnished with a spiral callus or thick 
plait at its base; operculum oblong, cor- 
neous. 
JHost of the species of Acteon are similar in form, but 
differing in proportion ; they are also generally striated 
transversely, and often elegantly colored ; the aperture 
is perfectly longitudinal, and above two thirds the length 
of the shell, acute-angular above, and rounded below, 
the edge thickening, and uniting with the base of the 
columella forms the callus or what is commonly called 
the single plait upon it ; other plaits sometimes occur 
upon the colummella ; the inner lip is very thin, and ap- 
plied close to the shell. Voluta tornatilis the type of the 
Genus is a British marine shell, the inhabitant of which 
forms deep furrows when traversing the sandy shores 
it loves to frequent. 
ACTEON Nose. . 
TAB. CCCLXXIV. 
Spec. Char. Oval, transversely striated, with 
one plait at the base of the columella ; striae 
equidistant, numerous, impressed, obscurely 
decussated, lip sulcated within. 
The only character except the want of color, by which 
this fossil can be distinguished from the recent Acteon 
