. The Cambridge natural history. Zoology. XIII ELECTRIC ORGANS 365 associate particular sounds with the possession of dangerous spines, and warned by the sounds, they refrain from attacking the owner of the spines, to the mutual advantage of both. Electric Organs. âElectric organs capable of generat- ing more or less powerful electric discharges are pre- sent in certain Fishes, both marine and freshwater. They occur in a few Elasmobranchs (species of Baia, Torpedo, and Eypnos), in such Teleosts as the African Silurid Malojpterurus, the "Electric Eel" (Gymnotus), and in species of Mor
. The Cambridge natural history. Zoology. XIII ELECTRIC ORGANS 365 associate particular sounds with the possession of dangerous spines, and warned by the sounds, they refrain from attacking the owner of the spines, to the mutual advantage of both. Electric Organs. âElectric organs capable of generat- ing more or less powerful electric discharges are pre- sent in certain Fishes, both marine and freshwater. They occur in a few Elasmobranchs (species of Baia, Torpedo, and Eypnos), in such Teleosts as the African Silurid Malojpterurus, the "Electric Eel" (Gymnotus), and in species of Mormy- ridae ( Mor- myrus). With one exception electric organs are com- posed of metamor- phosed mus- cular fibres, and their nerve-endings or motor end- plates. The species of Baia have two small electric organs, one on each. Fig 209.âAn Electric Ray {Torpedo) dissected to show its electric organs. On the left the nerves supplying the organ are dissected out. The prismatic areas on the surface of the organ indicate the vertical columns of electric plates, of which there may be 500,000 in each The dorsal surface of the brain is exposed, br, , electric organs ; t. mucus organ. Gills; / spiracle; 0, eye; .-, ,- , . , ,, canals â , tr, tri-geminal nerve ; tr\ its electric branch , V, vagus ; J, fore-brain ; //, mid-brain ; //J, cerebellum ; iv, electric lobe of the medulla oblongata. (From Parker and Haswell, after Gegenbaur.) side of the terminal portion of the tail.^ In Gymnotus' the X Ewart, Phil. Trans. 179 (.), 1888, pp. 399, 410, and 539 ; 183 (b), 1893, p. 389^ » Ballov;itz, ^rc;.. Mikr. Anat. 1. 1897, p. 686 ; Carl Sachs, Untersuchungcn an. Zitteraal, 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett),
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
