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The torpedo is known to have as many as eighty young ones. It produces within itself1 very soft eggs, which it then transfers to another place in the uterus, and from that part ejects them. The same is the case with all those fish to which we have given the name of cartilaginous; hence it is, that these alone of all the fishes are at once viviparous and oviparous. The male silurus2 is the only fish among them all that watches the eggs after they are brought forth, often for as long a period as fifty days, that they may not be devoured by other fish. The females of other kinds bring forth their eggs in the course of three days, if the male has only touched them.

1 All the chondropterygian fishes, Cuvier says, have, in addition to their ovaries, real oviducts, which the ordinary fishes have not; the lower part of which, being detached, acts as the uterus, into which the eggs descend when they have gained their proper size: and it is here that the young ones burst forth from the egg, when the parent animal is viviparous.

2 Aristotle, Hist. Anim. B. vi. c. 13, says the same of the glanis, or silurus.

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