. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 112 FRANCIS GILCHRIST exists primarily in the entoderm, and that the ectoderm is largely de- pendent upon the entoderm for its regional characters. LOCOMOTION Experiments on the Origination of Stolons In the preceding section we noted that the pedal stolons of the scyphistomas typically form from the upper portions of the stalk, and that as they grow outward they tend to point upward away from the base. They also have a tendency to form on the side of the stalk away. FIG. 8. Pedal stolons formed by half polyps. A. A polyp ha
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 112 FRANCIS GILCHRIST exists primarily in the entoderm, and that the ectoderm is largely de- pendent upon the entoderm for its regional characters. LOCOMOTION Experiments on the Origination of Stolons In the preceding section we noted that the pedal stolons of the scyphistomas typically form from the upper portions of the stalk, and that as they grow outward they tend to point upward away from the base. They also have a tendency to form on the side of the stalk away. FIG. 8. Pedal stolons formed by half polyps. A. A polyp has been cut ap- proximately into halves. B. The piece which retains the base forms a typical pedal stolon from the side opposite the cut. C. The piece which lacks the base forms a short stolon from near the lower end. D. \ half polyp in locomotion toward the left. E. Later stage of the same polyp. from the remnants of older stolons. These facts suggest that the base and the older stolons have an inhibiting influence upon the formation of new stolons. To tesl this assumption two experiments were performed: ( 1) Twenty polyps were selected which showed neither buds nor Ions, and to which no injury had been done. A bit of the calcareous -uhstrate adhering to the base was taken as evidence that the base was intact. Krom ten of these polyps the base was then cut away. Twenty- four hours later about e«|iial numbers of the operated and the unop- eratcd polyps (five and six respectively) had produced stolons. The rate of stolon formation is therefore not greatlv, if at all, influenced bv. 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
