"stony material"; "nitrogenous waste products"

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Isn't the "stony material" calcium carbonate? or is aragonite also involved? Is the phrase "nitrogenous waste products" intended to mean anything beside ammonia?--Wetman (talk) 17:28, 14 July 2012 (UTC)Reply

Found "calcium carbonate" mentioned in the last line: fixed.--Wetman (talk) 17:40, 14 July 2012 (UTC)Reply