. Text book of zoology. Zoology. Pig. 239. Diagrammatic figure of a Gastro- pod seen from the left side (the shell removed). a anus, / foot, fc mantle cavity, m stomach, mu shell muscle, o mouth, op operculum. Besides the parts indicated by letters, certain portions of the nervous system are also drawn, viz., cerebral and pleural ganglia (seen above the oesophagus), and pedal ganglion (below the cesophagus). The dotted line indicates the boundary of the mantle chamber.— Fig. 240. Diagrams of various forms of Gastropod shells seen from the left side. A—B slightly curved; C spiral shell in
. Text book of zoology. Zoology. Pig. 239. Diagrammatic figure of a Gastro- pod seen from the left side (the shell removed). a anus, / foot, fc mantle cavity, m stomach, mu shell muscle, o mouth, op operculum. Besides the parts indicated by letters, certain portions of the nervous system are also drawn, viz., cerebral and pleural ganglia (seen above the oesophagus), and pedal ganglion (below the cesophagus). The dotted line indicates the boundary of the mantle chamber.— Fig. 240. Diagrams of various forms of Gastropod shells seen from the left side. A—B slightly curved; C spiral shell in which the successive coils do not touch; D ditto, in which the coils lie closely upon each other (the common type).—Orig. much folded; they are regarded as olfactory organs. Besides these, a pair of small eyes is generally situated upon the head; they are sometimes borne at the tips of special tentacle-like stalks (as in the Common Snail), but are usually placed directly upon the head. 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 Boas, J. E. V. (Johan Erik Vesti), 1855-1935; Boas, J. E. V. (Johan Erik Vesti), 1855-1935. Lehrbuch der Zoologie. London, Sampson Low, Marston
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
