APPROX.  3 TO 4 INCHES.

5 TO 6 INCHES.

HERMIT CRAB OPENING:    APPROX.     1  AND  17/64TH.

3.90 TO 4.70 INCHES..... (10 TO 12 CM).

HERMIT CRAB OPENING:    APPROX.     1 INCH.

APPROX.   7 TO 8 INCHES....... (BUSYCON CONTRARIUM).