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Of or pertaining to the Elasmobranchii. -- n.

Of or pertaining to Elasmobranchii. -- n.

A subclass of fishes, comprising the sharks, the rays, and the Chimæra. The skeleton is mainly cartilaginous.

A name applied to the elasmobranch fishes, because the nasal sac is double.

copulatory organs, developed on the anterior side of the ventral fins of sharks and other elasmobranchs. See Illust. of Chimæra.

That division of elasmobranch fishes which includes the sharks.

An order of elasmobranch fishes, including, among living species, only the chimæras; -- called also Holocephala. See Chimæra; also Illustration in Appendix.

A comprehensive division of fishes which includes the elasmobranchs and ganoids. [Written also Palæichthyes.]

The class of Vertebrata that includes the fishes. The principal divisions are Elasmobranchii, Ganoidei, and Teleostei.

A group of fishes including the sharks and rays; the Elasmobranchii; -- called also Placoidei.

A specially modified part of the ventral fin in male elasmobranchs, which serves as a copulatory organ, or clasper.

The order of elasmobranch fishes which includes the sawfishes, skates, and rays; -- called also Rajæ, and Rajii.

Any one of numerous elasmobranch fishes of the order Raiæ, including the skates, torpedoes, sawfishes, etc.

Any one of several species of elasmobranch fishes of the genus Pristis. They have a sharklike form, but are more nearly allied to the rays. The flattened and much elongated snout has a row of stout toothlike structures inserted along each edge, forming a sawlike organ with which it mutilates or kills its prey.…

An order of elasmobranchs including the sharks and rays; the Plagiostomi. Called also Selacha, Selache, and Selachoidei.

Any one of numerous species of elasmobranch fishes of the order Plagiostomi, found in all seas.

Any one of numerous species of large, flat elasmobranch fishes of the genus Raia, having a long, slender tail, terminated by a small caudal fin. The pectoral fins, which are large and broad and united to the sides of the body and head, give a somewhat rhombic form to these fishes. The skin is more or less spinose.…

A tubular orifice communicating with the gill cavity of certain ganoid and all elasmobranch fishes. It is the modified first gill cleft.

The suborder of elasmobranch fishes which comprises the sharks.

Any one of numerous species of elasmobranch fishes belonging to Torpedo and allied genera. They are related to the rays, but have the power of giving electrical shocks. Called also crampfish, and numbfish. See Electrical fish, under Electrical.