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I found the following statement in this article :

The word "periostracum" means "around the bone"

This translation seems to me a bit dubious. The Greek word ὄστρακον (ostrakon) means literally translated shell (of eggs, mussels, etc) as you can check here. It can also refer to a broken piece of pottery (See: ostracism). So I think the correct translation should be "around the shell".-- Eusc ( talk) 18:27, 18 August 2012 (UTC) reply

Thanks! Very useful note Eusc. Next time please "Be Bold" and feel free to change something like this yourself. Best wishes, Invertzoo ( talk) 13:12, 15 September 2012 (UTC) reply