. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE TWENTY-RAYED STARFISH. 213 bcsi, and A. I'ldgaris) has not been easy to determine in the adult. Although Dr. Cole, as we have seen, comes nearest to establishing an anterior pole in the five-rayed starfish, A. forbcsi (Fig. 8). Jennings Co/), in experiments on righting reactions, also found that: " Individual starfish do have a more or less permanent ' set' toward the use of a certain ray in pulling themselves over in the. FIG. 10. Photograph of a small specimen of Pycnopodia helianthoides with 14 rays. Notice five
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE TWENTY-RAYED STARFISH. 213 bcsi, and A. I'ldgaris) has not been easy to determine in the adult. Although Dr. Cole, as we have seen, comes nearest to establishing an anterior pole in the five-rayed starfish, A. forbcsi (Fig. 8). Jennings Co/), in experiments on righting reactions, also found that: " Individual starfish do have a more or less permanent ' set' toward the use of a certain ray in pulling themselves over in the. FIG. 10. Photograph of a small specimen of Pycnopodia helianthoides with 14 rays. Notice five rays on one side, and two on the opposite side, are regenerating from autotomy. Rps, respiratory papilla. Natural size. Photo by author. i righting ; A. forrcri uses the same ray (, ray e, vide Fig. 8) that A. forbcsi uses as anterior pole. This anterior pole seems to be directly homologous with the anterior end in Pycno- podia, judging the size of the rays and their relation to the smaller ones in the latter. The number of madreporites, especially in multiradiate species, may vary : Cuenot ('91), Ludwig ('99), Delage et Herouard ('03), Sedgwick ('09), Verrill ('14), Crozier ('21), and on that account the true position of the madreporite is difficult to determine. In. 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
