The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . * M.dc Blainville has changed the name Onchiilium into Peronia,anii transfers the first to the Vaginulus. He places Perouiaamongst his Cyclfjbraiichia; but I cannot perceive any real differencebetween their respiratory organ and that of the other Pulmonea. [Asthis genus is not the Onchidium nf Buchanan, as Cuvier supposed,M. tie Kerussac proposes to name it Onchis.^ t Sowerby maiutains that the shell in Planorbis is always reversed,or sittislral.—Ed. t When t

The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . * M.dc Blainville has changed the name Onchiilium into Peronia,anii transfers the first to the Vaginulus. He places Perouiaamongst his Cyclfjbraiichia; but I cannot perceive any real differencebetween their respiratory organ and that of the other Pulmonea. [Asthis genus is not the Onchidium nf Buchanan, as Cuvier supposed,M. tie Kerussac proposes to name it Onchis.^ t Sowerby maiutains that the shell in Planorbis is always reversed,or sittislral.—Ed. t When t Stock Photo
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The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . * M.dc Blainville has changed the name Onchiilium into Peronia, anii transfers the first to the Vaginulus. He places Perouiaamongst his Cyclfjbraiichia; but I cannot perceive any real differencebetween their respiratory organ and that of the other Pulmonea. [Asthis genus is not the Onchidium nf Buchanan, as Cuvier supposed, M. tie Kerussac proposes to name it Onchis.^ t Sowerby maiutains that the shell in Planorbis is always reversed, or sittislral.—Ed. t When the shell is oval-globose, and the cloak sufficiently ampleto cover it, in an expanded state, the genus is the Awphipeplen ofNilson ; [and when the shell is turreted, and the cloak entire, thegenus is named y^ptexa by Fleming.—Ed.J GASTEROPODA NUDIBRANCHIATA. 351