
Magilus is a genus of sea snails, marine gastropod mollusks in the family Muricidae, the murex snails or rock snails. This genus was brought by Michel (1988) into the separate family Magilidae together with Latiaxis Species within the genus Magilus include: ...
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http://en.wikipedia.org/wiki/Magilus

Magilus is a genus of gastropod molluscs, the members of which live among corals. The become gradually sunk in the coral, and would soon be entirely buried were it not that they possess the ability of producing the shell into a tube whose growth keeps pace with that of the coral. The process continues until the shell loses all trace of its original...
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http://www.probertencyclopaedia.com/browse/BM.HTM
No exact match found.