. Cassell's natural history. Animals; Animal behavior. FAMILY The proboscis in this family is retractile, and the tongue (according to the observations of Dr. Gray) is entirely unarmed ; the tentacles are laterally folded, the eyes are on the uppersurface at their bases; the mantle solarium rEKSPECTivi .1. is included; foot moderate,and formed ,^ .. c,, â for walkin- ; the operculum horny, spiral, oval, or circular. The genus .^olamnn, or the ^tan-case Shell ^'âso named because the spiral edges of the whorls seen in the umbilicus have been fancifully compared to a winding staii
. Cassell's natural history. Animals; Animal behavior. FAMILY The proboscis in this family is retractile, and the tongue (according to the observations of Dr. Gray) is entirely unarmed ; the tentacles are laterally folded, the eyes are on the uppersurface at their bases; the mantle solarium rEKSPECTivi .1. is included; foot moderate,and formed ,^ .. c,, â for walkin- ; the operculum horny, spiral, oval, or circular. The genus .^olamnn, or the ^tan-case Shell ^'âso named because the spiral edges of the whorls seen in the umbilicus have been fancifully compared to a winding staii-case-has a depressed orbicular shell, with a wide and deep umbUicus. The aperture of the shell is squarish, the peristome is thin, the operculum horny and sub-spiral. There Ire twenty-five species, all from subtropical and tropical seas, and very widely distributed. FAMILY XII.â The animals in this family are predaceous. The mantle is enclosed with a rudimentary siphoual fold ; the foot is obtusely triangular and gi-ooved below; the tentacles are slender, and the eyes are placed at their outer bases -, the operculum is horny and spiral. The shells are nearly all white ; they are spiral and turreted, and are ornamented with varices ; the aperture is circular, without any â¢m. Ladder-shell," has mostly. 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 enc
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecta, booksubjectanimals
