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In a paper on the Torpedo, which was published in the Philosophical Transactions for 1834, I have briefly described the male generative organs of this fish as consisting of two firm oval testes, of vasa deferentia without vesiculae seminales, and of a papilla opening into the cloaca, the common termination of the seminal and urinary passages. Referring to Dr. Müller’s able work, “De glandularum secernentium structura penitiori,” in which he treats of the testes of the Rays and Sharks, I find that his de­scriptions and views of these organs are not in accordance with the above. His words are, “Maxime singularis est genitalium masculorum in Rajis et Squalis conformatio ; sunt enim organa glandulosa duplicis generis, altera, quae hucusque tanquam testiculi descripta sunt, ex globulis, non vero ex ductibus seminalibus conflata, altera, plerumque pro epididymidibus habita, ex canalibus serpentinis composita, sed minime cum testiculis globulosis conjuncta; quare non epididymides sed glandulas proprias esse conjicio.”

X. On the male organs of some of the cartilaginous fishes