The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . out the contained water may also be found on the lateral walls of the branchialsac, and in that case there are corresponding anteriorly directeddiverticula of the peribranchial cavity. There is a distinct endo-style on the ventral edge of the branchial sac and a peripharyngealband surrounding its anterior end, but there is no representativeof the dorsal lam
The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . out the contained water may also be found on the lateral walls of the branchialsac, and in that case there are corresponding anteriorly directeddiverticula of the peribranchial cavity. There is a distinct endo-style on the ventral edge of the branchial sac and a peripharyngealband surrounding its anterior end, but there is no representativeof the dorsal lamina on its dorsal edge. The cesopnagus com-mences rather on the ventral edge of the posterior end of thebranchial sac, and nms backwards to open into the stomach, whichis followed by a curved intestine opening into the peribranchialcavity. The alimentary canal as a whole is to the right of themiddlo line. The hermaphrodite reproductive organs are to theleft of the middle line alongside the alimentary canal. They open into the peribranchial cavity. The ovary is nearly spherical, whilethe testis is elongated, and may be continued anteriorly for a longdistance. The heart is placed in the middle line ventrally, be-. Fio^ IS.—D6lU)lwn dentictdatum, sexuAl gecemtlon, ftrom tbe left side. Xjetter-ing as for fig. 1? ; ml—mS, muscle handa , ng. nerve ganglion; sg, edgmata;tgl, aubneuml gland . pbr, peribninclual cavity ; all, atnal lobes ; so, senseorgans ; hrl, bmnclual lobes. (Original.) twoen the posterior end of the endostyle and the otsophageal nerve ganglion lies about the middle of the dorsal edge of thebody, and-gives off many nerves. Under it is placed the subncuralgland, the duct of which runs forward and opens into the anteriorend of the branchial sac by a simple aperture, surrounded by thespirally-twisted dorsal end of the peripharyngeal band (fig. 13, dt). of the sexual generation produce tailed larvaa ; these Deveiop-develop into forms known as nur
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Keywords: ., bookcentury1800, bookdecade1890, bookidencyclopedia, bookyear1892
