Voluta plumbea. _Sol. MSS. L'Egouen. Adanson_, _tab._ 4. _f._ 3. V. prunum. _Gm._ _p._ 3446. 33. _Martini_, 2. _t._ 42. _f._ 422 _and_ 3. _En. Meth._ 376. 8. _Lister_, 817. 28. (young.) _Dill._ 530. 69. * * * * * The plaits are very strong, and, together with the outer lip, white; equally common, and from the same country, as the last. * * * * * MARGINELLA faba, _Fly-spot Date Shell--lower figures._ _M. testa ovata, plicata, fulva, punctis fuscis ornata; spira conica; basi emarginata; columella 4 plicata._ Shell oval, plaited, fulvous, with brown dots; spire conic; base notched; pillar 4 plaited. V. faba. _Gm._ 3445. _Lister_, 812. 22. _Martini_, 2. _t._ 42. _f._ 431? 432, _and_ 3. _En. Meth._ 377. 1. _Gualt._ 28. _Q. Dill._ 528. 63. * * * * * The whorls of this pretty shell are plaited into little nodules; it is usually very small. The supposed variety figured by Martini, and mentioned by Mr. Dillwyn, I am inclined to believe, may be a distinct species. * * * * * Pl. 98 [Illustration] PALUDINA, _River Snail._ * * * * * GENERIC CHARACTER. _Testa ovata, spiralis, tenuis, umbilicata. Apertura semi-orbicularis, ad labii anterioris apicem subangulata. Operculum corneum._ _Animal fluviatile, branchiatum, viviparum, rostro brevissimo; oculis ad basin externam tentaculorum acutorum 2 appositis; pedis margine antico duplici; lateribus antice alis parvis instructis; ala dextera involuta in canalem per quem aqua in tracheam introducitur._ Typus Genericus _Helix vivipara_, Lin. Shell ovate, spiral, thin, umbilicated. Aperture nearly orbicular, slightly angulated at the top of the inner lip. Operculum horny. Animal fluviatile, branchiated, viviparous; rostrum very short; eyes placed at the external base of two pointed tentacula; anterior border of the foot double; on each side the fore part of the body a small wing; that on the right side is folded into a channel, by which the water is introduced into the respiratory canal. Generic Type _Viviparous Snail_ Pennant. * * * * *