. Elementary text-book of zoology. Zoology. Vel CHAPTER I. MOLLUSCA.* Bilaterally symmetrical unseymented animals, without a locomotory skeleton; with a a/ifml foot and «.illy a calcareous univalve or It! mice shell: fit// hm'nt (supraossophageal yartyHa\circuinaxophayeal i'iinj, and suboesophageal yron/> f yamjlia. SIXCE Cuvier several different groups of animals, which were placed amongst the worms by Linnanis, have been included in the Mollusca. Of late years, however, the anatomy and de- velopment of these forms have been more closely examined, and it seems fairly certain that some


. Elementary text-book of zoology. Zoology. Vel CHAPTER I. MOLLUSCA.* Bilaterally symmetrical unseymented animals, without a locomotory skeleton; with a a/ifml foot and «.illy a calcareous univalve or It! mice shell: fit// hm'nt (supraossophageal yartyHa\circuinaxophayeal i'iinj, and suboesophageal yron/> f yamjlia. SIXCE Cuvier several different groups of animals, which were placed amongst the worms by Linnanis, have been included in the Mollusca. Of late years, however, the anatomy and de- velopment of these forms have been more closely examined, and it seems fairly certain that some of them are allied to the Worms. In any case, the group Mollusca must be looked upon as of more limited extent than has for FIG. 492.—Older larva of a Gag«erqpo<2 (after Gegenbaur). 8, Shell; P, foot; Tel, velum; T, tentacles; Op, operculum for the closure of the shell opening. development stand in closer relationship to the Bryozoa, may be removed from the Mollusca and united with the latter under the head Molluscoidea. The Tunicata also must be constituted an independent group between the Mollusca and the Vertebrata. * G. Cuvier, •' Mrmoires pour servir a 1'histoire et a I'anatoinie des Mol- ; Paris. 1817. R. Leuckart, " Ueber die Morphologic mid die Verwandschaftsverhaltnisse der wirbellosen ; Braunschweig, 1848. Huxley, '• On the Morphology of the Cephalous Mollusca, as illustrated by the Anatomv of certain Heteropoda and Pteropoda, ; PitII. Trans.* 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 Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan


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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884