. Zoology : for students and general readers . Zoology. 446 ZOOLOGY. Tlie bony fishes date back to the Jurassic period, but did not become numerous until the Cretaceous and especially the Tertiary Period. The Green River beds of Wyoming aboumi in their remains. The Teleosts are divided into eight orders, in an ascending series as follows : Opisthomi, AjMcles, Nematognathi, Scypho- phori, Tcleocephali, Pediculati, Lophobranchii and Plectog- natlii. Order 1. Opiffhomi.—The fishes of this gToup are char- acterized by the separation of the shoulder-girdle from the head. The ventral fins are either
. Zoology : for students and general readers . Zoology. 446 ZOOLOGY. Tlie bony fishes date back to the Jurassic period, but did not become numerous until the Cretaceous and especially the Tertiary Period. The Green River beds of Wyoming aboumi in their remains. The Teleosts are divided into eight orders, in an ascending series as follows : Opisthomi, AjMcles, Nematognathi, Scypho- phori, Tcleocephali, Pediculati, Lophobranchii and Plectog- natlii. Order 1. Opiffhomi.—The fishes of this gToup are char- acterized by the separation of the shoulder-girdle from the head. The ventral fins are either abdominal or wanting. The typical genus is Notocantli us, in which the body is elon- gated, with a proboscis-like snout. Order 2. Apodes.—In this group, also, the scapular arch. Fig. 403.—Coranion Eel, Aiiguilla acutiro&tns. is free from tlie skull, while the maxillary bones are rudi- mentary. Tlie branchial apertures are unusually small, and there are no ventral fins, while the body is very long, cylin- drical, snake-like. The order is represented among many other forms by the common eel {Anguilla), the conger-eel, and the Murcena of the Mediterranean Sea. The conger-eel {Conger oceanicus Gill) ranges from Newfoundland to the West Indies. Gill, as well as Gtlnther and others, regards a long transparent ribbon-like fish, described under the name of Lepdocephalus as the young of the conger-eel. The common eel, Anguilla ucutirostris (Fig. 403), occurs on both sides of the Atlantic, on the North American coast as far south as Cape Ilatteras, and in inland rivers and lakes. The sexes do not differ externally, and internally only. 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
