Fishes of Australia a Popular And Systematic Guide to the Study of the Wealth W
Fishes of Australia a Popular And Systematic Guide to the Study of the Wealth W
David George Stead
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Only one of the very large Sharks is known to be oviparous and that is the huge Greenland Shark (Lemargus borealis), which is unique among Sharks, in that it produces eggs without any horny covering; these being deposited on the sea-bottom and left there to hatch. The other oviparous Sharks are the small species known as Dog-Fishes, the small Cat-Sharks and also those curious and to Australians familiar "Bullhead* or Port Jackson Sharks. The Rays that are oviparous, are those belonging to the f...amily Raiidce, popularly known as "Skates. " Many of the Sharks and even a few of the Rays more particularly the former are exceedingly formidable, and are greatly feared in many parts of the world. Fossil remains of Elasmobranchs of many species, are very abundant in some geological formations. These often take the shape of fin-spines and dermal-plates. The former are usually known as "ichthyodorulites. " Elasmobranchs are considered to be of a very primi- tive type among fishes, and amongst their number we must look for the ancestors of the higher bony-fishes or teleosteans.
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