. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COELOMIC PRESSURES IN SIPUNCULUS NUDUS 165 •operation. However, protraction never occurred when the pressure was below cm. of body fluid. The cessation of pressure rise and onset of fall may corre- spond to various states of protraction of the proboscis. Exceptionally the pressure rise may continue throughout the process of proboscis retraction. These irregu- larities illustrate the lack of strict coordination between pressure variations and proboscis protraction. Evidence of disjunction between the cycle of movements an
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COELOMIC PRESSURES IN SIPUNCULUS NUDUS 165 •operation. However, protraction never occurred when the pressure was below cm. of body fluid. The cessation of pressure rise and onset of fall may corre- spond to various states of protraction of the proboscis. Exceptionally the pressure rise may continue throughout the process of proboscis retraction. These irregu- larities illustrate the lack of strict coordination between pressure variations and proboscis protraction. Evidence of disjunction between the cycle of movements and the cycle of pressures is recorded by the kymograph record in Figure 1. There. FIGURE 2. kymograph, merits. SECONDS ZERO LINE PROBOSCIS ACTivny Pressure (ordinate) in mm. coelomic fluid in Sipunculus nudus recorded on all other phases of proboscis move- proboscis extending, |. 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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