All are white.
Is this instead a dog whelk - Nucella lapillus?
During the week of March 30th, large numbers of these suddenly came to the high tide zone and congregated on large boulders. I assume laying eggs?
Approx 5 cm in length. Natural shore. Just under water line.
This whelk was seen on subtidal kelp several times at Lab 11 Dive Site.
Found under water in a tide pool
This Nucella lamelosa or Wrinkled (aka Frilled) Dogwinkle is larger than most I see at low tide, over 2" long. Its shell is still nicely ridged, not worn like many. The operculum is helping keep it moist as a trap door.