. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NUTRITION OF RHYNCHOCOELS 413 proboscis it seems likely that these too are involved, and it is possible that the function of the barbs in this connection may be solely to puncture the prey and allow entry of proboscis secretions. An important secondary function may be to increase the grip of the proboscis on the struggling prey. Inert foods, such as dead oligochaetes or other animal remains, do not cause- proboscis eversion. Such materials, and killed prey brought to the mouth by the proboscis, are first "tested,"
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NUTRITION OF RHYNCHOCOELS 413 proboscis it seems likely that these too are involved, and it is possible that the function of the barbs in this connection may be solely to puncture the prey and allow entry of proboscis secretions. An important secondary function may be to increase the grip of the proboscis on the struggling prey. Inert foods, such as dead oligochaetes or other animal remains, do not cause- proboscis eversion. Such materials, and killed prey brought to the mouth by the proboscis, are first "tested," the head being arched over them and moved slowly from side to side. The head is then bent back, the distended mouth is applied to the food and ingestion commences (Fig. 5). Ingestion is by suction, resulting from alternate contractions and expansions of the general body musculature, and is facilitated by copious secretions of mucus from the basophilic glands of the huccal cavity and foregut. Oligochaetes up to two-thirds the length of the nemer- tean were completely swallowed within three minutes and could be seen extending into the posterior intestine after a further three or four minutes. Diameter, rather than length, of the food relative to the size of the mouth appears to be the critical factor determining whether or not ingestion is possible. Thus oligochaetes considerably longer than the nemertean will be swallowed, if cc. 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
