Note 2494 — BOOK IX. THE NATURAL HISTORY OF FISHES.

Cuvier says that it is true that the sea-frog is oviparous; but it is far from being the case that all the cartilaginous fishes but it are viviparous. The rays, for instance, produce large eggs of a square shape, and enveloped with a very hard horny shell. Aristotle, Hist. Anim. B. viii. c. 5, and B. ii. c. 16, makes the same exception as to the sea-frog or frog-fish.