. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 374 E. R. TRUEMAN coelomic pressures are used in the natural habitat, possibly to consolidate the burrow wall. Somewhat similar observations have been made in respect of burrowing in the earthworm (Roots and Phillips, 1960). DISCUSSION The digging activity of bivalve molluscs that burrow into soft substrates, such as Cardium, Donax, Anodonta or Ensis (Trueman, 19661); Trueman et al., 1966a), makes an interesting comparison with that of Arenicola, for all are well adapted for. FIGURE 4. Diagram of two successive stages of bur
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 374 E. R. TRUEMAN coelomic pressures are used in the natural habitat, possibly to consolidate the burrow wall. Somewhat similar observations have been made in respect of burrowing in the earthworm (Roots and Phillips, 1960). DISCUSSION The digging activity of bivalve molluscs that burrow into soft substrates, such as Cardium, Donax, Anodonta or Ensis (Trueman, 19661); Trueman et al., 1966a), makes an interesting comparison with that of Arenicola, for all are well adapted for. FIGURE 4. Diagram of two successive stages of burrowing of a generalized bivalve mollusc showing pedal (PA) and shell (SA) anchorages (arrows), a, valves adducted (double arrow, AM) producing pedal dilation and a cavity (C) in the sand around the valves. Contraction of the retractor muscles (RM) then causes the shell to be pulled down, b, valves reopened and pressed against the sand by the elasticity of the ligament (solid, double arrow, L) holding the shell fast when contraction of the protractor (P) and transverse muscles (T) causes pedal protraction. AM, adductor muscle; H, pedal haemocoele; M, mantle 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
