. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 6. Aboral portion of stomodaeum, and axial funnel canal of Mnciiri- opsis leidyi. A. Before defecation. I. Paragastric canal. 2. Cilia. 3. Food canals. 4. Funnel. 5. Axial funnel canal. 6. Sense organ. 7. Ex- cretory pore. B. During defecation, arrows showing direction of waste. Note shrunken appearance of stomodseum. all passed out the cilia begin beating again, and the branch of the funnel canal slowly retracts. Although several successive defeca- tions of specimens have been observed, only one branch was used, and in
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 6. Aboral portion of stomodaeum, and axial funnel canal of Mnciiri- opsis leidyi. A. Before defecation. I. Paragastric canal. 2. Cilia. 3. Food canals. 4. Funnel. 5. Axial funnel canal. 6. Sense organ. 7. Ex- cretory pore. B. During defecation, arrows showing direction of waste. Note shrunken appearance of stomodseum. all passed out the cilia begin beating again, and the branch of the funnel canal slowly retracts. Although several successive defeca- tions of specimens have been observed, only one branch was used, and in no specimen was the use of both branches observed. THE EARLY DEVELOPMENT OF THE FOOD CATCHING MECHANISM. Since the complex food catching apparatus is present only in the adult Mnemiopsis, the question of its ontogeny naturally arises. The young were plentiful at the time of this study, and various stages were examined. The smallest specimens obtained were in the Cydippidse-stage, approximately 2 mm. high and 2 mm. broad. Fig. 7. These pos- sess two long branching tentacles with no trace of the tentacular ridge, labial ridge, or labial trough. They feed by capturing the food with the tentacles, retracting them, and drawing them down over the lip and into the stomodseum, where the food is drawn off. Another contraction, and the tentacles emerge, to again float up above the 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
