. Fishes. Fishes. Adaptations of Fishes 59 of electric fishes, is not an eel, but allied rather to the sucker or carp. It is, however, eel-like in form and lives in rivers of Brazil and Guiana. The electric organs are in two pairs, one on the back of the tail, the other on the anal fin. These are made up of an enormous number of minute cells. In the electric eel, as in the other electric fishes, the nerves supplying these organs are much larger than those passing from the spinal cord for any other pur- pose. In all these cases closely related species show no trace of the electric powers. Dr. G
. Fishes. Fishes. Adaptations of Fishes 59 of electric fishes, is not an eel, but allied rather to the sucker or carp. It is, however, eel-like in form and lives in rivers of Brazil and Guiana. The electric organs are in two pairs, one on the back of the tail, the other on the anal fin. These are made up of an enormous number of minute cells. In the electric eel, as in the other electric fishes, the nerves supplying these organs are much larger than those passing from the spinal cord for any other pur- pose. In all these cases closely related species show no trace of the electric powers. Dr. Gilbert has described the electric powers of species of star-gazer (Astroscopns y-grcBcuni and A. zepliyreus), the electric cells lying under the naked skin of the top of the head. Electric power is ascribed to a species of cusk {Urophycis regiits), but this perhaps needs verification. Photophores or Luminous Organs.—Many fishes, chiefly of the deep seas, develop organs for producing light. These are known as luminous organs, phosphorescent or- gans, or photophores. These are independently developed in four entirely unrelated groups of fishes. This differ- ence in origin is accompanied by corresponding difference in structure. The best-known type is found in the Iniomi, including the lantern-fishes and their many relatives. These may have luminous spots, differ- to. 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 Jordan, David Starr, 1851-1931. New York, H. Holt and Company
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