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19.

the reefs and thus build up the land at the expense of the sea.

Family Solariidae. No 53.

The Sun Dials or Stair Shells. These elegant shells are all tropical. The specimens exhibited show beautifully the winding stair within the umbilicus or opening at the base of the shell.

Family Ianthinidae. No 54.

Raft Shells or Violet Snails. These animals and their shells are beautifully tinted with violet. They are gregarious and float at the surface of the sea, supported