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18.
 have been sold for as high as $300. Equally good ones can now be bought for $1.

Family Vermetidae. No 52.
Worm Shells.

The growth of these shells is at first regularly spiral, but in later stages it becomes irregular. In many places these shells form reefs between tides, among which a variety of [[strikethrough]] other [[/strikethrough]] mollusks, crabs and other forms of marine life live; Sand and mud and [[strikethrough]] other [[/strikethrough]]various kinds of earth-forming material wash into and behind