rock borer

British

noun

any of various sea creatures that bore into rock, such as some sea urchins, sponges, annelid worms, barnacles, isopods, and molluscs

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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rock borer

It is a rock borer, and can bore into very hard rock.

From Beautiful Shells of New Zealand An Illustrated Work for Amateur Collectors of New Zealand Marine Shells, with Directions for Collecting and Cleaning them by Moss, E. G. B.

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