44 
SOLARIUM plicatum. 
TAB. DXXIV.— 2. 
Spec. Char. Convex, wrinkled, concentrically sul- 
cated ; umbilicus bounded by a more or less 
projecting crenated ridge ; aperture round. 
Syn. Solarium plicatum. Lamarck , Env. de Paris , 
104. Hist. Nat. v. 7 ,p. 5. 
The sulci that cross the wrinkled surface of this shell 
are very narrow and deep upon the upper surface, but 
broader and unequal beneath ; they vary in number, 
but are generally 3 or 4 above, and 5 or 6 beneath : the 
crenulated keel that projects into the umbilicus, some- 
times half closes it, at others it leaves it more open, es- 
pecially in the French variety, whose umbilicus is very 
wide and open. 
Equally abundant as the last at Barton. 
