The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . , Vas deferens. ng. ov,pbr, ngl, Subneural gland. pharynx, and is thereforeproperly a part of the ali-mentary canal. The oeso-phagus opens from it far backon the dorsal edge (see below).The wall of the branchial sacis pierced by a large numberof vert ical si it s^t he st ig-mata—placed in numeroustransverse rows (secondary orsubdivided gill-slits). Theseslits place the branchial sacin communication with theperibranchial or atrial cavity,which lies outside it (fig. 6).Between the stigmat
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . , Vas deferens. ng. ov,pbr, ngl, Subneural gland. pharynx, and is thereforeproperly a part of the ali-mentary canal. The oeso-phagus opens from it far backon the dorsal edge (see below).The wall of the branchial sacis pierced by a large numberof vert ical si it s^t he st ig-mata—placed in numeroustransverse rows (secondary orsubdivided gill-slits). Theseslits place the branchial sacin communication with theperibranchial or atrial cavity,which lies outside it (fig. 6).Between the stigmata thewall of the branchial sac istraversed by blood-vessels,which are arranged in threeregularscrics(fig. 7)—(i) thetransverse vessels, which runhorizontally round the wall *^- wn- and open at their dorsal and ventral ends into large longi-tudinal vessels, the dorsal and ventral sinuses; (2) the finelongitudinal vessels, which run vertically between adjacent trans-verse vessels and open into them, and which bound the stigmata;and (3) the internal longitudinal bars, which run vertically in. Trough (From Hcrdman, CAo^enier Report.) f^G. 7.—A, Part of branchial sac of Ascidia from , Transverse section of same. Transverse duct. tr, Horizontal membrane. i^, Iv, Fine longitudinal ,p, Stigmata. Internal longitudinal bar. (A and B are drawn to different scales.)
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
