. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 2. Anal segment of a specimen of P. appendiculaiits, X '35- filaments in this specimen are almost three times the length of the anal segment, as in P. appendiculatus as figured and described by Fraipont. Sections of the anal filaments show that they are ectoderma. outgrowths surrounded by a cuticle which is continuous with that of the rest of the worm. They are without lumens and the cells seem to be like those of the ectoderm of other parts of the body of the worm. It is possible that the organs have a sensory function
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 2. Anal segment of a specimen of P. appendiculaiits, X '35- filaments in this specimen are almost three times the length of the anal segment, as in P. appendiculatus as figured and described by Fraipont. Sections of the anal filaments show that they are ectoderma. outgrowths surrounded by a cuticle which is continuous with that of the rest of the worm. They are without lumens and the cells seem to be like those of the ectoderm of other parts of the body of the worm. It is possible that the organs have a sensory function, although they are not at all active and are not ciliated. The ring of glandular papillae" present in the larva persists in the adult. In the oldest specimen that the writer has, the superior anal lip is not as distinctly divided into lobes as Fraipont figures, but there is some indication of differentiation into FIG. Cephalic segment of the same specimen as that of Fig. 2, X *35- The cephalic tentacles (Fig. 3) are seen to be without setae and longer than in other species, as is the case in P. appendiculatus. 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
