. Elementary text-book of zoology. Zoology. SKXSK oIKiANS. paired or unpaired swellings (7V/,<• us) consists only of the labyrinth (tig. 578, /), and in Teleosteans, Ganoids, and Chimcera lies partly in the cranial cavity, surrounded by fatty tissue. It is worthy of notice that in Cyprinoidce Characince, Siluridce, and others, the labyrinth is connected with the swimming bladder by a chain of small bones. The olfactory organ in Amphioxus consists of a simple unsymmetrical pit at the anterior end of the nervous centre. In Cyclostomes also it FIG, sso. - Horizontal . section through, the cons
. Elementary text-book of zoology. Zoology. SKXSK oIKiANS. paired or unpaired swellings (7V/,<• us) consists only of the labyrinth (tig. 578, /), and in Teleosteans, Ganoids, and Chimcera lies partly in the cranial cavity, surrounded by fatty tissue. It is worthy of notice that in Cyprinoidce Characince, Siluridce, and others, the labyrinth is connected with the swimming bladder by a chain of small bones. The olfactory organ in Amphioxus consists of a simple unsymmetrical pit at the anterior end of the nervous centre. In Cyclostomes also it FIG, sso. - Horizontal . section through, the consists of a simple tube, with an unpaired median eye of Esox Indus. opening. All other fishes possess double, and o», cornea; ; Pf, processus falci- indeed with the exception of the Dipnoi blindly- closed nasal cavities, the internal surface of which is considerably increased by folds of the mucous membrane. The sense of taste seems to be less developed, the buccal cavity, and especially in the richly innervated part of the soft palate. For the tactile sense, lips and their appendages—the frequently appealing barbules—probably serve. Certain isolated rays of the ventral fin may also, on account of their rich nerve supply, be regarded as tactile organs (Trigla). The nervous organs of the so-called mucous canals, which we have before mentioned, constitute an organ of a special f orniis ; CH, cam- panula Halleri; No, optic nerve ; Sc, ossification* of the sclerotic. It is located in * Compare E. H. Weber, " Be aure et auditu hominis et ; P. I., " De aure animalium ; Lipsise, 1820. C. Hasse, " Anatomische ; Heft 3 : '• Das Gehororgan der ; Leipzig, 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 Claus, Carl, 1835-1
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
