The Biological bulletin (20186905808)

Title: The Biological bulletin

Identifier: biologicalbullet98mari (find matches)

Year: [1] (s)

Authors: 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

Subjects: Biology; Zoology; Biology; Marine Biology

Publisher: Woods Hole, Mass. : Marine Biological Laboratory

Contributing Library: MBLWHOI Library

Digitizing Sponsor: MBLWHOI Library

Text Appearing Before Image:

COELOMIC PRESSURES IN SIPUNCULUS NUDUS 165 •operation. However, protraction never occurred when the pressure was below 0.9 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

Text Appearing After Image:

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, ;

Kymographen sipunculus nudus das biologische Bulletin Buchillustrationen Zoologie Biologie meeresbiologisches Labor Meeresbiologie hohe Auflösung Bilder aus dem Internetarchiv

1825

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