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Nacella polaris
''Nacella polaris'' is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Nacellidae, one of the families of true limpets. 〔 Bouchet, P. (2014). Nacella polaris (Hombron & Jacquinot, 1841). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=713922 on 2015-01-26 〕
==Description==
The shell of ''Nacella polaris'' grows to about long with deep water specimens being rather smaller. It is an elongated ovate, moderately elevated cone with a low apex somewhat towards the anterior margin and angled in that direction. There are about 30 faint radial ribs and a series of fine concentric lines that indicate the annual growth rings. The exterior of the shell is varying shades of pale brown and grey and the interior is dark purplish-brown in deep water specimens but creamy-brown in those from shallow water. The mantle has a fringe of short tentacles.〔(''Nacella (Patinigera) polaris'' (Strebel, 1908) ) The Smithsonian National Museum of Natural History. Retrieved 2012-02-16.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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