. Zoology for high schools and colleges. Zoology. 44C ZOOLOGY. The bony fishes date back to the Jurassic period, but did not become numerous until the Cretaceous and especially the Tertiary Period. The Green Eiver beds of Wyoming abound in their remains. The Teleosts are divided into eight orders, in an ascending series as follows : Opistliomi, Apodes, NematognatM, Scypho- phori, Teleocephali, Pediculati, Lophobrarichii and Plectog- nathi. Order 1. Opidhomi.—The fishes of this group are char- acterized by the separation of the shoulder-girdle from the head. The ventral fins are either abdomina
. Zoology for high schools and colleges. Zoology. 44C ZOOLOGY. The bony fishes date back to the Jurassic period, but did not become numerous until the Cretaceous and especially the Tertiary Period. The Green Eiver beds of Wyoming abound in their remains. The Teleosts are divided into eight orders, in an ascending series as follows : Opistliomi, Apodes, NematognatM, Scypho- phori, Teleocephali, Pediculati, Lophobrarichii and Plectog- nathi. Order 1. Opidhomi.—The fishes of this group 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 Notocanthus, in which the body is elon- gated, with a proboscis-like snout. Ord&r 3. Apodes.—In this group, also, the scapular arch. Fig. 403.—Common Eel, Anguilla acuiirostris. is free from the skull, while the maxillary bones are rudi- mentary. The 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 Leptocephalus as the young of the conger-eel. The common eel, Anguilla acutirostris (Fig. 403), occurs on both sides of the Atlantic, on the North American coast as far south as Cape Hatteras, 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, H. Holt and Company
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