. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GUT FORM AND FUNCTION IN PHILOSCIA 351 four tapering- caeca (midgut) which arise from a small common caecal chamber situated ventrally at the junction of the proventriculus and hindgut, and a hindgut subdivided into four distinct regions. The mouthparts, feeding mechanism and functional morphology of the foregut have been described elsewhere (Hassall, 1975b). Briefly, decomposing leaf litter is fragmented by the mandibles, pushed into the mouth by the other mouthparts and passed down the oesophagus into the proventriculus. T
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GUT FORM AND FUNCTION IN PHILOSCIA 351 four tapering- caeca (midgut) which arise from a small common caecal chamber situated ventrally at the junction of the proventriculus and hindgut, and a hindgut subdivided into four distinct regions. The mouthparts, feeding mechanism and functional morphology of the foregut have been described elsewhere (Hassall, 1975b). Briefly, decomposing leaf litter is fragmented by the mandibles, pushed into the mouth by the other mouthparts and passed down the oesophagus into the proventriculus. The proventriculus presses the food, squeezing out liquids and channelling them ventrally into the midgut caeca while solids are directed into the anterior chamber of the hindgut where they may remain for up to seven days. The walls of the proventriculus bear internal lamellae and when the organ is empty it can be moved by its extrinsic musculature in such a wav that secretions from the caeca can be directed oe prv. cm 2 mm an FIGURE 1. Alimentary canal of Philoscia mitscorum from the dorsal aspect. The origins of the caeca from the common ventral chamber beneath the proventriculus are not shown: an represents position of postero-ventral anal slit; cm, caecum ; oe, oesophagus ; pap, papillate region of hindgut; prv, proventriculus; rm, rectum; sph, sphincter; typh, 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
