. The Cambridge natural history. Zoology. ii6 CEPHALOCHORDATA epithelial cells (see Fig. 72, p. 118), some of which bear sensory processes, while others have a striated cuticular border. There is no general ciliation of the surface in the adult. The true mouth is a small pore at the bottom of a large vestibule (the stomodaeum), placed at the anterior end of the dorsfr cot^l myom. int coel Fig. 71.—Diagram of the anatomy of Amphioxus. A, anterior; B, posterior part. an, Anus ; at>\ atrium ; atr\ its posterior prolongation ; atrp, atriopore ; br, brain ; , branchial clefts ; , brown
. The Cambridge natural history. Zoology. ii6 CEPHALOCHORDATA epithelial cells (see Fig. 72, p. 118), some of which bear sensory processes, while others have a striated cuticular border. There is no general ciliation of the surface in the adult. The true mouth is a small pore at the bottom of a large vestibule (the stomodaeum), placed at the anterior end of the dorsfr cot^l myom. int coel Fig. 71.—Diagram of the anatomy of Amphioxus. A, anterior; B, posterior part. an, Anus ; at>\ atrium ; atr\ its posterior prolongation ; atrp, atriopore ; br, brain ; , branchial clefts ; , brown funnel ; , primary, , secondary branchial lamella ; , primary, , secondary branchial rod ; , caudal fin ; , central canal ; cir, cirri ; coel, coelom ; , dorsal fin ; , dorsal fin-ray ; , cerebral vesicle ; , eye-spot; gnyt, gonad ; int, intestine ; Ir, liver ; mth, mouth ; myom, myotomes ; nch, notochord ; nph, nephridia ; , olfactory pit ; , oral hood ; ph, pharynx ; sk, skeleton of oral liood and cirri (dotted) ; , spinal cord ; , ventral fin ; , ventral fin-ray ; vl, velum ; , velar tentacles. (From Parker and Haswell.) ventral surface (Figs. 70 and 71), and formed by the " oral hood," which may be a prolongation forwards of the atrial or nieta- pleitral folds at each side. The edges of the oral hood bear 12 to 20 pairs of cirri (Fig. 70, cir) or ciliated tentacles (strengthened by skeletal rods), which form a sensory fringe around the open- ing. The anus (Figs. 70 and 71, an), is asymmetrical, being. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
