. A junior course of practical zoology. Zoology. 188 AMPHIOXUS 5. The pharynx is of an inverted heart-shape in transverse section. a. The branchial bars, or gill-arches. Owing to their obliquity and extreme closeness to one another twenty or more bars may be cut on each side in a single section. Each bar is clothed on its outer surface by the atrial epithelium, which is a single. Fig. 41.—AmpMoxus lanceolatus. Transverse section through the anterior part of the pharynx of an adult specimen. The boundary of the atrial cavity is indicated by a thick black line. (a. m. m.) A, skeleton of dorsal f
. A junior course of practical zoology. Zoology. 188 AMPHIOXUS 5. The pharynx is of an inverted heart-shape in transverse section. a. The branchial bars, or gill-arches. Owing to their obliquity and extreme closeness to one another twenty or more bars may be cut on each side in a single section. Each bar is clothed on its outer surface by the atrial epithelium, which is a single. Fig. 41.—AmpMoxus lanceolatus. Transverse section through the anterior part of the pharynx of an adult specimen. The boundary of the atrial cavity is indicated by a thick black line. (a. m. m.) A, skeleton of dorsal fin. B, spinal cord. O, notocliord. D, connective- tissue sheatli surrounding notocliord. E, cavity of pharynx. F, hyper- branchial groove of pharynx. G-, hypobranchial band of pharynx, which in this anterior part is flattened out or even convex, H, atrial cavity, J, trans- verse muscles in floor of atrial cavity. Iff, dorsal coslomic canal, P, meta- pleural canal, R, left dorsal aorta. S, cardiac aorta, X, myotome. Y, suspensory fold of pharynx, separating the dorsal ccelomic canal from the atrial cavity. Z. gill-arch or branchial bar ; the white triangular spot repre- sents the cut surface of the skeletal rod of the 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 Marshall, A. Milnes (Arthur Milnes), 1852-1893; Hurst, C. Herbert (Charles Herbert), 1856?-1898, joint author. London, Smith, Elder
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1888
