. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 34 PETER V. FANKBONER A. jalcata in detail and bring out in the Discussion pertinent comparative structures and functions. The short, ciliated oesophagus leads from the mouth to the spindle shaped mid-gut and its digestive diverticula complex (Figs. 7 and 8). The style sac terminates just anterior to the posterior adductor, while the intestine forms a flattened loop originating at the posterior stomach wall and terminating within the exhalant siphon chamber as the anus (Fig. 2). The stomach is a complex sorting organ which h
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 34 PETER V. FANKBONER A. jalcata in detail and bring out in the Discussion pertinent comparative structures and functions. The short, ciliated oesophagus leads from the mouth to the spindle shaped mid-gut and its digestive diverticula complex (Figs. 7 and 8). The style sac terminates just anterior to the posterior adductor, while the intestine forms a flattened loop originating at the posterior stomach wall and terminating within the exhalant siphon chamber as the anus (Fig. 2). The stomach is a complex sorting organ which houses the entrances to the caecum and the numerous openings to the dichotomies of the digestive diverticula (Fig. 7). There are sixteen duct openings to the "liver" which are equally SS HG. FIGURE 7. A doral view of the stomach of A. jalcata, its structures, and its ciliary currents. Abbreviations used are: A, antero-dorsal tract; C, caecum; DD, ducts of digestive diverticula; GS, gastric shield; H, dorsal hood; HG, hood groove; I, intestinal groove; IG, minor intestinal groove; L, left duct tract; LF, left fold of duct tract; O, oesophagus; R, right duct tract; RF, right fold of duct tract; S, shield tract; SS, style sac; TT, tongue of major typhlosole; t, tongue of minor typhlosole; X, appendix. divided into right and left duct pouches (Figs. 7 and 8). The ducts and tubules of the digestive diverticula are similar in morphology to those described by Owen (1955) for M. editlis. The right and left duct pouches form ciliated gutters along the floor of the stomach which veer to the left anteriorly, entering into the sorting caecum (Figs. 7 and 9). The gross ciliary currents of the pouch tracts are directed towards the caecum. The caecum is a short, finger-shaped pocket which opens into the stomach from the left anterior wall. The structure and the ciliary currents of this organ are illustrated in Figures 7, 8 and 9. The sorting mechanism of the caecum in A. jalcata is s
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
