Page:American Seashells (1954).djvu/77

Rh species are found nowhere else. Breaking apart coral blocks often reveals interesting rock-boring clams.

There are few active shell collectors who have not given serious thought to trying their hand at dredging. This is especially true if one has spent several summers in one locality and acquired a large and representative collection of the littoral and intertidal species. Over half of our American species prefer to live below the low-tide mark and, although storms occasionally cast up samples of this rich fauna on our beaches, trapping and dredging are