. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A B Fig. 2. Diagrams representing the shape of cross-sections in the middle of the body of Thyotie as it burrows into the sand. The form shown in A precedes that shown in B. were able to come to the top of the sand when covered under fifteen centimeters but none came up through twenty centimeters although ten large individuals were tested. Clark ('99) found that Synapta burrowed with the tentacles and that it always went into the sand " head ; Thyone differs from it quite strikingly in the latter respect but
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A B Fig. 2. Diagrams representing the shape of cross-sections in the middle of the body of Thyotie as it burrows into the sand. The form shown in A precedes that shown in B. were able to come to the top of the sand when covered under fifteen centimeters but none came up through twenty centimeters although ten large individuals were tested. Clark ('99) found that Synapta burrowed with the tentacles and that it always went into the sand " head ; Thyone differs from it quite strikingly in the latter respect but this difference is perhaps no more than would be expected from the structural unlikeness between the two forms. V. Feeding. After an individual has been undisturbed for some time it often extends the anterior end of the body and the tentacles and makes feeding movements (Fig. i, A). In this extension the longitudinal muscles pull the lantern forward and the circular body muscles contract. The anterior end of the body is thus everted, like the turning inside out of the finger of a glove. The branched tentacles are then pushed out by the pressure of the fluids within them and the action of the muscles in their 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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