. Cassell's natural history. Animals; Animal behavior. 1 ⢠shell in this far i|.'iturc of the .shell 1 short muzzle, eys oil 1âM<I â it, tongue armed. 'I'liis i, ,i - ik to a depth of one liundi ist of the countries of thf yli I'V are commonly called " Sen ' Tu tli and ap]ieais a mamniillat little genus 1 Two British spec In the gem young it is i.'-i; is repeatedly pai- The animal lias : glide, as the shells are fixed together in clusters. Vermetus is found uu the coasts of Portugal, the Mediterranean, Africa, and India. The genua-Siliqimria has a tubular cylindrical shell, irregularl
. Cassell's natural history. Animals; Animal behavior. 1 ⢠shell in this far i|.'iturc of the .shell 1 short muzzle, eys oil 1âM<I â it, tongue armed. 'I'liis i, ,i - ik to a depth of one liundi ist of the countries of thf yli I'V are commonly called " Sen ' Tu tli and ap]ieais a mamniillat little genus 1 Two British spec In the gem young it is i.'-i; is repeatedly pai- The animal lias : glide, as the shells are fixed together in clusters. Vermetus is found uu the coasts of Portugal, the Mediterranean, Africa, and India. The genua-Siliqimria has a tubular cylindrical shell, irregularly twisted; its apex is spiral, the aperture is circular. In SiUqiuiria the notcli for the siphon remains unclosed, so that as the shell grows it prolongs the fissure through the whole length of its tube. This genus was formerly regarded as an Annelid, but its molluscous nature was demonstrated by M. Audouin. The typical species is found in ths Mediterranean, living embedded in sponges with silicious spicules. Eight species are recorded. FAMILY XV.â Til? shells of this family are spiral, turreted, covered with a thick )liiii,;'ti c-pidcrmis ; a,pertui-e often channelled, or notched in front; (latiT lip s/iii|ilc ; iiper'-ulum horny, spiral. The sjiire is often very mach eroded. The anima liroad, noil retractile muzzle; tlie tentacles are wide apart; eye stalks united to bases of tentacles ; foot bioad and short, angular in front; mantle-margin fringed ; tongue long and linear. These animals are mjstiy viviparous, and ail flu\-iatile, being inliabitants of fresh-water lakes and i-ivers throughout the * From f'4:", an o-jtrioli, from the aparture b»i;ig fanoifuUy suiipaocl to rcoem'ole the foot of that 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecta, booksubjectanimals
