APPROX. 4 TO 4.75 INCHES.
(NATURAL IMPERFECTIONS ARE POSSIBLE ON WHELK SHELLS).
3.90 TO 4.70 INCHES..... (10 TO 12 CM).
APPROX. 5 INCHES....... (BUSYCON SINISTRUM).
APPROX. 8 INCHES....... (BUSYCON SINISTRUM).