. Cassell's natural history. Animals; Animal behavior. THE SXAIL. warmer parts „f the world. In tlio soutlirru States of Noitli America they are iiumc ;i [leouliar group. The genus Melania* has its whorls ornamented with sti-iai or spines ; the outer ii is sharp ; aperture oval, pointed above ; operculum sul)-spiral. Out hundied and si\t .species are along the rivers of the soutli of Europe, ludii, the Plulipjinit> and Pacific Islands. The genus Faludomus (jxtlim, m;irsh ; (/uDiifti, house) has a smooth turbniitid c muricated shell. The spire is small, and usually eroded
. Cassell's natural history. Animals; Animal behavior. THE SXAIL. warmer parts „f the world. In tlio soutlirru States of Noitli America they are iiumc ;i [leouliar group. The genus Melania* has its whorls ornamented with sti-iai or spines ; the outer ii is sharp ; aperture oval, pointed above ; operculum sul)-spiral. Out hundied and si\t .species are along the rivers of the soutli of Europe, ludii, the Plulipjinit> and Pacific Islands. The genus Faludomus (jxtlim, m;irsh ; (/uDiifti, house) has a smooth turbniitid c muricated shell. The spire is small, and usually eroded ; operculum hoinv 1 mu 111 jiucleus The animal is like Melmiia, with a fringed maigm to its mxutl Ten species are known from Ceylon and India. It inhabits mouutxin stiexms souk times up to si.\ tliousand feet in elevation. The shell of J/e/BJioy;s!s has the last whorl elongated; the spin is slioit m ]iiiinted ; tlie aperture notched in front ; the inner lip is thickened the ojiuculuni is •siilj .spiral. Twenty species of this genus are found in Spain, Austiii \sii"\Iinoi iiul N. Z, d FAMILY XVI.— The shells of this family are conical or globtdar, with a thick olive-green epidermis ; tlie aperture of the shell is rounded and entire; the operculum is horny, or shelly and concentric. The animal has ji liroad muzzle ; the eyes are placed on short pedicels outside the tentacles, which are long and slender. The Pahidiuidce inhabit fresh water in all parts of the world. The animal of Paludina has a small lobe on each side of its neck. It has a ^ ~/ long muzzle and very short eye pedicels. ^ 'sB The shell is thin, turbinated, umbilicated ; LixGi-AL TEETH OF iMf S- F- ii''"Hio .,,-,1 ) tliB splrc is produccd ] the whorls are round and smooth. The development of the gill-bearing Gasteropods may be easily seen in the common River Snail (Ffdudina vivipara), which bring forth their young alive, and whose oviducts in early summer contain y
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