. Animal biology. Zoology; Biology. 210 METAZOAN PHYLA together. A little way from the ventral margin and parallel to it is seen a small groove, known as the pallial line, which marks the attachment of the muscle layer of the mantle, or pallium. Ver?fr/'c/e. Vencf Suprabran^ ch/cr/ chambers Body /ncrss 3^e//. /r7-/-es-/^/'r7e Per/carc^/a/ coiv/'^y Aun'c/& HiWr;ey G///S /nfest/'ne Marrrf/e Fig. 118.—Diagrammatic cross section of a fresh-water mussel. (From Parker and Haswell, " Text-Book of Zoology," after Howes, by the courtesy of The Macmillan Company.) When viewed in cross sect
. Animal biology. Zoology; Biology. 210 METAZOAN PHYLA together. A little way from the ventral margin and parallel to it is seen a small groove, known as the pallial line, which marks the attachment of the muscle layer of the mantle, or pallium. Ver?fr/'c/e. Vencf Suprabran^ ch/cr/ chambers Body /ncrss 3^e//. /r7-/-es-/^/'r7e Per/carc^/a/ coiv/'^y Aun'c/& HiWr;ey G///S /nfest/'ne Marrrf/e Fig. 118.—Diagrammatic cross section of a fresh-water mussel. (From Parker and Haswell, " Text-Book of Zoology," after Howes, by the courtesy of The Macmillan Company.) When viewed in cross section the shell is seen to exhibit several layers: (1) a horny layer or periostracum, sometimes called the epidermis; (2) of ureter Per/carc//'a/ cav/fy Verff-r/'c/e Ani-er/'or Ofo/efucy-or /77tJSc/£'. 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 Wolcott, Robert Henry, 1868-1934. New York ; London : McGraw-Hill Book Company, Inc.
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Keywords: ., bookcentury1900, bookcoll, booksubjectbiology, booksubjectzoology
