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Rh holes are open. Fished commercially below 20 feet, especially between Monterey and Point Conception. The legal minimum size for sportsmen is 7 inches, and the catch is limited to 5 specimens per person per day. This is a popular food and, when polished on the outside, makes an attractive mantel piece.

5 to 7 inches in length, almost round, fairly deep, with a scalloped edge and strong corrugations on the outer surface. 3 to 4 large tubular holes are open. Exterior dull-green to reddish brown. Interior brilliant iridescent. The variety diegoensis Orcutt is the same. Abundant in its southern range. The legal minimum collecting size is 6 inches.

7 to 8 inches in length, almost round, moderately deep, and sculptured with 30 or 40 raised, coarse spiral threads. Exterior dull reddish brown; interior iridescent blues and greens. 5 to 6 holes are open. Fished commercially in southern California. The legal minimum size is $6 1/4$ inches. H. splendens Reeve, H. revea Bartsch, and H. turveri Bartsch are the same species in all likelihood.

4 to 5 inches in length, elongate, flattened, with numerous spiral threads. Exterior dark brick-red, mottled with pale bluish green. 5 to 6 holes are open, and their edges are not elevated. This is a small, relatively scarce species.

4 to 5 inches in length, oval, fairly deep, with weak corrugations and weak to strong spiral threads. 4 to 5 holes open, tubular. Outer color mottled with brick-red, greenish blue and gray. H. aulaea Bartsch is a little more corrugated than usual, and it may be this species. H. smithsoni Bartsch and H. sorenseni Bartsch appear to be giant specimens of assimilis Dall.