. The Biological bulletin. Biology; Zoology; Marine biology. Fig. 4. ing sides and the position of the apex are reversed and this is obviously associated with the fact that the receptacle is on op- posite sides in the two cases. The real shape of the annulus in either sinistral or dextral forms is seen only after observation from different points of view. The annulus is wide from side to side and compressed from before back, very protuberant in front and less so be- hind and has a very small base, which accounts for the movability noticed by Faxon. A view of the sinistral annulus (Fig. 3) take
. The Biological bulletin. Biology; Zoology; Marine biology. Fig. 4. ing sides and the position of the apex are reversed and this is obviously associated with the fact that the receptacle is on op- posite sides in the two cases. The real shape of the annulus in either sinistral or dextral forms is seen only after observation from different points of view. The annulus is wide from side to side and compressed from before back, very protuberant in front and less so be- hind and has a very small base, which accounts for the movability noticed by Faxon. A view of the sinistral annulus (Fig. 3) taken from the side that bears the receptacle is shown in Fig. 5, which emphasizes the very narrow base and the greatly protruding anterior face. The apex is also seen to rapidly taper. The receptacle obviously extends around onto this lateral side above the level of the central groove, which is indicated in broken lines as seen through the side. Upon looking down upon this same sinistral annulus. Fig. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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