Have you considered this may be a Pedipis species such as mirabelis? (please forgive the spelling) Leslie Does it look like this one? http://www.femorale.com.br/shellphotos/detail.asp?photo=25648.jpg This came from Iceland. I did some shelling in Costa Rica long time ago, but did not collect anythin like this. Marcus From: David Kirsh Reply-To: Conchologists of America List To: [log in to unmask] Subject: W/E mystery gastropod Date: Sat, 26 Apr 2003 13:03:52 +0000 People, I found the rocks at Punta Pelada on Costa Rica's Pacific coast were covered with small live Littorina-like snails at the upper reaches of the intertidal area, beyond most of the Nerites. Keen has something from Puntarenas, C.R. she called Lacuna succinea Mörch, but was uncertain about its true placement. The size of my specimen is about right: 5 - 6 mm. But she says they are on seaweed rather than on rocks and there's a chink-like umbilicus. Mine was clearly exposed on rocks and has an obvious umbilicus. Surface is eroded and gray. Anyone familiar with this ubiquitous gastropod? A Google search turns up nothing. Maybe the name has been revised. David Kirsh Durham, NC