. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 204 H. P. KJERSCHOW-AGERSBORG. qui depends de 1'anus est alteree par le madreporite. " Quand on regarde 1'animal par la face dorsale, 1'interradius madreporique vient apres 1'interradius anal, separe de lui, d'un cote, dans le sens indirect (inverse de celui de la succession des heures sur un cadran), par un seul interradius, de 1'autre par deux interradius," p. 2. "... quand on regarde 1'animal par le pole apical, 1'anus est en arriere, le madreporite en avant et a droit," p. 3. IX A **. FIG. 2. Ritter's
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 204 H. P. KJERSCHOW-AGERSBORG. qui depends de 1'anus est alteree par le madreporite. " Quand on regarde 1'animal par la face dorsale, 1'interradius madreporique vient apres 1'interradius anal, separe de lui, d'un cote, dans le sens indirect (inverse de celui de la succession des heures sur un cadran), par un seul interradius, de 1'autre par deux interradius," p. 2. "... quand on regarde 1'animal par le pole apical, 1'anus est en arriere, le madreporite en avant et a droit," p. 3. IX A **. FIG. 2. Ritter's and Crocker's figure of the dorsal radial muscles of Pycno- fodia lielianthoides, showing the relation of the radial muscles to the asteroid groundplan. as represented in Fig. i. A, the "anterior" ray; I-V, the "pos- terior " rays; ,. rays added, on the right side, to the original six rays after metamorphosis; /.r—/.r7, rays added to the left side; a, anus; Mp, mad- reporite. Shipley ('93), MacBride ('96), and Lankester Coo) do not commit themselves in regard to the position of the madreporite, , as far as the starfish is concerned. Ritter and Crocker ('oo) in their work on Pycnopodia adopted Ludwig's and Agassiz's plan of numbering the radii of the typical five-rayed echinoderm. According to this, when the apical side is uppermost, counting from the madreporite clockwise, the rays are numbered from These authors go on by saying: "From a study of the metamorphosis, Ludwig, '82, considers that the star should be oriented by a line running interradially between I. and II. and radially along IV., thus bringing the madreporite in the left anterior interradius" (Fig. i).. 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, Ma
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
