. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. F£G. 200. — DIAGRAM F A LONGITUDINAL SECTION THROUGH THE HEAD OF Ammoccetcs (A) AND Petromyzon (B). JnffflML 1 J o r fit Ji N. FIG. 201.—LONGITUDINAL SECTION THROUGH THE HEAD OF Animocu-/i'x. /', velum ; P, papilhe of mucous membrane ; K,K,K, three, anterior gills ; Th, tliymid gland (hypobranchial furrow) ; N, nasal sac ; *, communication between the ventricle of the olfactory lobe and that of the prosencephalon ; Ep, epiphysis ; Jtif, infundibulum ; HH, metencephalon ; ML, medulla oblongat
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. F£G. 200. — DIAGRAM F A LONGITUDINAL SECTION THROUGH THE HEAD OF Ammoccetcs (A) AND Petromyzon (B). JnffflML 1 J o r fit Ji N. FIG. 201.—LONGITUDINAL SECTION THROUGH THE HEAD OF Animocu-/i'x. /', velum ; P, papilhe of mucous membrane ; K,K,K, three, anterior gills ; Th, tliymid gland (hypobranchial furrow) ; N, nasal sac ; *, communication between the ventricle of the olfactory lobe and that of the prosencephalon ; Ep, epiphysis ; Jtif, infundibulum ; HH, metencephalon ; ML, medulla oblongata ; b, c, ventricles of the mid- and hind-brain ; o, subdural cavity ; Ch, notochord ; R, spinal cord. by the external gill-passages growing out into long tubes, which unite to form a common duct on either side; this opens far behind the branchial apparatus on the ventral side of the body. Fishes.—From the Elasmobranchii onwards the gills conic into close relation with the skeletal part of the visceral arches, and in these Fishes they consist of closely-approximated transverse lamina? (Fig. 202), which are firmly attached to both sides of the septa which separate the individual gill-sacs from one another, so that each septum bears gill-laminae on both its anterior and pos- terior surface. The gill-sacs, of which there are usually five (six or seven in Notidanus), usually open separately to 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 Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, New York, Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondonnewyorkmacmi
