. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 212 H. P. KJERSCHOW-AGERSBORG. A (or VI.) is the median posterior ray (Fig. /), while ray IV. is in the lead. Figs. 4 and 5 show the relation of the madreporite to the physiological anterior end in young specimens of Pycnopodia; the apical ray, , ray IV., is uppermost on the page (Fig. 4). In Fig. 5, A represents the oral view. Ritter and Crocker ac- cepted as anterior end that pole of the star which corresponds to the larval lobe organ (Fig. 6, Lo), but if the physiological anterior end in Pycnopodia corresponds to the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 212 H. P. KJERSCHOW-AGERSBORG. A (or VI.) is the median posterior ray (Fig. /), while ray IV. is in the lead. Figs. 4 and 5 show the relation of the madreporite to the physiological anterior end in young specimens of Pycnopodia; the apical ray, , ray IV., is uppermost on the page (Fig. 4). In Fig. 5, A represents the oral view. Ritter and Crocker ac- cepted as anterior end that pole of the star which corresponds to the larval lobe organ (Fig. 6, Lo), but if the physiological anterior end in Pycnopodia corresponds to the posterior end of the common starfish, then the larval lobe organ has nothing to do with it, at least not in P\cnopodia. It is, of course, an open question whether the anterior rays (II., III., IV., V., I., Fig. 3) correspond to the posterior rays of the same numbers in Ritter and Crocker's sketch (Fig. 2). If they do not, then the physiological anterior end in the adult Pycnopodia has become established independently of the factors as noted above. .But this may not be the case. Of course,. JL FIG. 9. Diagram to show the morphological groundplan of the common starfish. Ill, anterior end; an, anus; mdp, madreporite; o, morphological center; 1-5, interradii; I-V, radii. (From Delage and Herouard.) the common starfish may indeed move with any of its rays in the lead (Jennings, '07, p. 155) ; and "do the same thing, under the same conditions, in a number of different ways, and never do the same thing twice in exactly the same way" (Coe, ('12)). The anterior ray of these species of starfish (Astcrias forrcri, A. for-. 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, Fra
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
