Text-book of comparative anatomy . FIG. 137.—Enteric canal, vascular system, and nephridia of Echiurus. sg, Lateral vessels ofthe prostoinium ; vd, dorsal vessel of the prostomium : vdi, dorsal vessel of the fore-gut (vda); 1:,crop; mcl, mid-gut, with the accessory intestine (tul); vv, ventral vessel; n, nephridia; t, theirfunnel; as, anal glands ; «/, hind-gut; a, anus ; mb, muscles of the anterior hooked set;*-; m, mouth. and is justly considered as the connecting piece of these channelsarched over and thus separated from the intestine. The mid-gut of the Myzostomidce (Fig. 175, p. 262), wit
Text-book of comparative anatomy . FIG. 137.—Enteric canal, vascular system, and nephridia of Echiurus. sg, Lateral vessels ofthe prostoinium ; vd, dorsal vessel of the prostomium : vdi, dorsal vessel of the fore-gut (vda); 1:,crop; mcl, mid-gut, with the accessory intestine (tul); vv, ventral vessel; n, nephridia; t, theirfunnel; as, anal glands ; «/, hind-gut; a, anus ; mb, muscles of the anterior hooked set;*-; m, mouth. and is justly considered as the connecting piece of these channelsarched over and thus separated from the intestine. The mid-gut of the Myzostomidce (Fig. 175, p. 262), with itsbranched diverticula which stretch as far as the lateral edge of thebody, recalls the mid-gut of the Annelid species Sphincter, whose bodyis also broad and disc-like. While among the Sipunculacea the mid-gut in the Priapulidce runsin a straight line through the body, in the Slpunculida (Fig. 138) itforms a descending limb which runs through the trunk to the posterior 208 GOMPARA TIJE ANA TOMY
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
