AA 
SOLARIUM plicatum. 
TAB. DXXIV.—fig. 2. 
Spec. Cuar. 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. 
Tue 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. 
