Addisonia

Addisonia is a genus of sea snails, marine gastropod mollusks in the family Addisoniidae. The ovate shell has a subconical shape. It is strongly symmetrical, porcellaneous,and thin. The blunt apex is curved backward, downward, and to the left. The shell has no epidermis. The margin is unthickened, simple, and entire. The pedal muscular impression ...
Found on http://en.wikipedia.org/wiki/Addisonia
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