Cancellaria Alternata

Cancellaria alternata, Conrad,
Jour. Ac. Nat Sc. Vol 7 p 155

Shell short, subfusiform; whorls
six, with 9 or 10 thick longitudinal
oblique costoe, with prominent
spiral & finer intermediate striae;
spire subconical; aperture less than
half the length of the shell ; labium
with three plaits decreasing in size
inferiorly; aperture semilunar.

H 0.5

Tertiary

Choptank river, Md.