. Breviora. 1957 ALIiOLOBOPIIORA LIMICOLA xii (internal constriction of gut wall). An internal constriction in xii usually is confined to one side but in xiii usually is on both sides. Oesophageal wall much thinner in xiii-xiv than in xi-xii, calciferous lamellae recognizable only in xii-xi and the posterior half of x. In x the dorsal blood vessel at first appears to be within a groove in dorsal face of gut but this appearance results from presence of two rounded protuberances (77 specimens) which, with a similar pair on the ventral face, provide the only evi- dence, in these strongly contract
. Breviora. 1957 ALIiOLOBOPIIORA LIMICOLA xii (internal constriction of gut wall). An internal constriction in xii usually is confined to one side but in xiii usually is on both sides. Oesophageal wall much thinner in xiii-xiv than in xi-xii, calciferous lamellae recognizable only in xii-xi and the posterior half of x. In x the dorsal blood vessel at first appears to be within a groove in dorsal face of gut but this appearance results from presence of two rounded protuberances (77 specimens) which, with a similar pair on the ventral face, provide the only evi- dence, in these strongly contracted worms, for existence of calci-. Fig. 1. Oesophagus in segments x-xiv, dorsal view. Fig. 2. Oesophagus in segments x-xiv, horizontal section. ferous sacs. Intestinal origin in xv (77). Gizzard in xvii (77), the layer with brilliant muscular sheen in horizontal section abruptly narroAving and ending shortly behind insertion of 17/18. Posteriorly the gut wall is much thinner, weaker, breaking most easily in both wet and dry material just behind 17/18. Gut narrowing slightly through xix, rather valvular in region of insertion of 19/20. The typhlosole, shortly after its 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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