. Cassell's natural history. Animals; Animal behavior. are spiral notch or canal. The shells are remarkable for their extreme elegance of form. The ffenus Scalaria, known commonly as the " Wentletrap," a pure white lustrous shell, the whorls of the turret-like shell being round and nearly separate, merely united by the sharp transverse ribs. When molested, the animal exudes a purple fluid. The .species exceed one hundred in number, and ran"e from low water to one hundred fathoms. Most of the species are tropical, but there are exceptional species found on the coasts of Greenland
. Cassell's natural history. Animals; Animal behavior. are spiral notch or canal. The shells are remarkable for their extreme elegance of form. The ffenus Scalaria, known commonly as the " Wentletrap," a pure white lustrous shell, the whorls of the turret-like shell being round and nearly separate, merely united by the sharp transverse ribs. When molested, the animal exudes a purple fluid. The .species exceed one hundred in number, and ran"e from low water to one hundred fathoms. Most of the species are tropical, but there are exceptional species found on the coasts of Greenland and Norway. The others are almost world-wxle. In the " Wentletrap" (Scalaria pretiosa) the periodic mouths encii-cle the sheK whorls, which are sometimes separate, and con- tribute not a little to the beauty of once costly conchological treasure. FAMILY XIII.—CEl, ' scALAuiA j^^ ^j_^j_, family the shell is spiral \nd many-whorled, the mouth of the shell is channelled in front, and the outer lip is usually expanded in the adult shell. The animal has a broad and short rostrum, with the tentacles wide apart ; the eyes are on short stalks united to the base of the tentacles. The mantle-margin has a rudimentary siphon-fold in front; the foot is broad and short, and angular in front : the operculum horny and spiral. The members of this family are met with in marine, estuarine, and fresh-water localities. The genus Cerithium, or the " Horn-shell," has a tun-eted, many-whorled shell, with indistinct varices; the canal is produced in front, and slightly recurved ; the columella is thickened and callous behind. Cerithia are found in all parts of the world. More than one hundred living species have been described. Potamides* is the name given to a group of fresh-water Cerithia, with thick olive- brown epidermis, and an orbicular many-whorled operculum. They are found chiefly World, especially in Africa and India, inhabiting the mud of large rivers. The
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