. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 314 C. M. CHILD. posterior to a certain level, and once established, the second zooid grows nore rapidly than the first. When the animal is 5-8 mm. in length a very short second zooid is present and in animals sightly longer than this fission may be induced experi- mentally (Child, 'io£). In the posterior region of the second zooid a third zooid arises early because the head region of the second zooid is not sufficiently active to control more than a short region; the extreme posterior region of the body often seems to consi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 314 C. M. CHILD. posterior to a certain level, and once established, the second zooid grows nore rapidly than the first. When the animal is 5-8 mm. in length a very short second zooid is present and in animals sightly longer than this fission may be induced experi- mentally (Child, 'io£). In the posterior region of the second zooid a third zooid arises early because the head region of the second zooid is not sufficiently active to control more than a short region; the extreme posterior region of the body often seems to consist of a series of very short head regions, reminding one of the series of minute segments which often appear in the growing posterior region of various annelids. Under experimental conditions it is possible to delay or inhibit the appearance of the second zooid in regulating pieces of to accelerate it. For example, if we isolate the region 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 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
