If anyone would like to see the sexual dimorphism of Viana regina, there is a picture on Bret Raines' "what is it?" page. Go to http://www.molluscs.net/whatisitf.htm The bottom picture on the page (Photo 20) shows 24 Viana regina, including several of the notched-lip males and several of the smooth-lipped females. Click on the picture for a closer view. Paul M.