. The Biological bulletin. Biology; Zoology; Marine biology. DESCRIPTION OF AN ABNORMAL LOBSTER CHELIPED. 259 morphological plane. This is illustrated in Fig. 5. This''figure represents diagrammatically a cross section through the index and dactyl of a normal claw from the left side of a lobster, viewed from the position of the distal end of the appendage. The posterior side of the claw, which is more darkly pigmented in the living lobster, is here shaded, while the ventral side is left clear. The primary morphological relations, as they would obtain if the appendage were extended laterally in
. The Biological bulletin. Biology; Zoology; Marine biology. DESCRIPTION OF AN ABNORMAL LOBSTER CHELIPED. 259 morphological plane. This is illustrated in Fig. 5. This''figure represents diagrammatically a cross section through the index and dactyl of a normal claw from the left side of a lobster, viewed from the position of the distal end of the appendage. The posterior side of the claw, which is more darkly pigmented in the living lobster, is here shaded, while the ventral side is left clear. The primary morphological relations, as they would obtain if the appendage were extended laterally in a horizontal. Fig. 5. Diagram to illustrate effects of torsion in a normal left chela, primary morphological position; II., position as a result of torsion. I., plane and there were no torsion, are shown in the position marked I, where the plane passing through the index {IL) and dactyl {DL) is vertical. Due to torsion, however, the claw is rotated anteiiorly^ nearly 90° (probably ordinarily 75°-8o°; for con- venience, we may call it 80°), so that its plane approximates the horizontal, as shown in position II. The dactyl thus lies an- teriorly, while the posterior surface (shaded) is uppermost. By a bending of the leg now, however, the claws may be brought ^ By "rotated anteriorly" it is meant that the dorsal side has rotated over in the anterior 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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