Planorbis corneus (Linnaeus)
Subject: Planorbis, Snails
Tag: Mollusks
Date 1868
Author Charles Bevalet  
Source/Photographer
English: Louis Fibuier (1868) Ocean World : Being a Descriptive History of the Sea and its Living Inhabitants, New York: D. Appleton & Co.
Source: https://commons.wikimedia.org/wiki/File:FMIB_50248_Planorbis_corneus_(Linnaeus).jpeg

The great ramshorn snail (Planorbarius corneus) is a relatively large species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae. The shell of this species appears to be dextral in coiling, even though it is in fact sinistral or left-handed.