. Cassell's natural history. Animals; Animal behavior. THE LALDER-SHELL. SUjUna lias a glassy, globular shell, with a tapering apex has a thick mantle, which is bent over the last whorls of the shell. It In. of Sea Urchins, or h\mn\ in living Star-fishes and Corals. It is found in Britain, the West Indies, Philippines, and the Galapagos. -'. 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 rEK
. Cassell's natural history. Animals; Animal behavior. THE LALDER-SHELL. SUjUna lias a glassy, globular shell, with a tapering apex has a thick mantle, which is bent over the last whorls of the shell. It In. of Sea Urchins, or h\mn\ in living Star-fishes and Corals. It is found in Britain, the West Indies, Philippines, and the Galapagos. -'. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Duncan, P. Martin (Peter Martin), 1821-1891; Metcalf Collection (North Carolina State University). NCRS. London [etc] Cassell & Company, Limited
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecta, booksubjectanimals
