. Animal biology. Zoology; Biology. /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/£'. Posfen'or adductor musc/e V/sceral gfangh'on Ana/ open/rrg C/oaca Dorsa/ si
. Animal biology. Zoology; Biology. /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/£'. Posfen'or adductor musc/e V/sceral gfangh'on Ana/ open/rrg C/oaca Dorsa/ siphof^ Ventra/ s/pho/7 G/// Pe>c/cfJ^ Cerebrop/eurar/ Fig. 119.—Diagram of the internal anatomy of a fresh-water mussel. {Compiledfrom various sources.) The mantle and gills on the near side are not shown, and the body is indi- cated as having had a part of the wall cut away. The stomach, liver, gonad, pericardium, and kidney are shown in section. a series of layers of carbonate of lime, together known as the prismatic layer; (3) a layer of 7iacre or mother-of-pearl, also carbonate of 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
