Fishes . himdcB,or Galeida), a modem offshoot from the Lamnoid type, andespecially characterized by the presence of a third eyelid, thenictitating membrane, which can be drawn across the eye from 19B The True Sharks below. The heterocercal tail has no keel; -the end is bent up-ward; both dorsal fins are present, and the first is well in frontof the ventral fins; the last gill-opening over the base of thepectoral, the head normally formed; these sharks are ovovivipa-rous, the young being hatched* in a sort of uterus, with orwithout placental attachment. Some of these sharks are small, blunt-too
Fishes . himdcB,or Galeida), a modem offshoot from the Lamnoid type, andespecially characterized by the presence of a third eyelid, thenictitating membrane, which can be drawn across the eye from 19B The True Sharks below. The heterocercal tail has no keel; -the end is bent up-ward; both dorsal fins are present, and the first is well in frontof the ventral fins; the last gill-opening over the base of thepectoral, the head normally formed; these sharks are ovovivipa-rous, the young being hatched* in a sort of uterus, with orwithout placental attachment. Some of these sharks are small, blunt-toothed, and reach a very large size and are surpassed in voracityonly by the various Lamnida. The genera Cynias and Mustehis, comprising the soft-mouthedor hound-sharks, have the teeth flat and paved, while well-developed spiracles are present. These small, harmless sharksabound on almost all coasts in warm regions, and are largelyused as food by those who do not object to the harsh odor of. Fig. 140.—Soup-fin Shark, Caleus zyopterus (Jordan & Gilbert). Monterey. sharks flesh. The best-known species is Cynias cants of theAtlantic. By a regular gradation of intermediate forms, throughsuch genera as Rhinotriacis and Triakis with tricuspid teeth, wereach the large sharp-toothed members of this family. Caleus (orGaleorhinits) includes large sharks having spiracles, no pit at theroot of the tail, and with large, coarsely serrated teeth. Onespecies, the soup-fin shark (Caleus zyopterus), is found on thecoast of California, where its fins are highly valued by theChinese, selling at from one to two dollars for each set. Thedelicate fin-rays are the part used, these dissolving into a finelyflavored gelatine. The liver of this and other species is usedin making a coarse oil, like that taken from the dogfish. Otherspecies of Caleus are foimd in other regions, Caleus galeus beingknown in England as tope, Caleus japoniciis abounding in differs mainly in hav
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