1. On the Foetal Development of the Torpedo. The accounts we possess by different naturalists of the mode of generation of this fish are so discordant and perplexing, that I have been induced to investigate the subject afresh, and I now propose to submit to the Society the results of my observations. It may be advisable to premise a few particulars respecting the generative organs of the Torpedo. The female, like those Rays and Squali which are considered ovoviviparous, has two ovaria, a common oviduct and two uterine cavities. The ovaria, one on each side of the spine, are attached to and enveloped in a fold of the peritonaeum, just above the liver and a very little below the common infundibulum, or opening of the oviduct. The oviduct passes round on each side under the liver, and ends in an enlargement, one over each kidney, which from its function may be called a uterine cavity, formed, like the duct itself, of a villous inner membrane and of a peritonaeal outer coat, connected together by loose filamentous tissue, and opening into the lower part of the intestine or cloaca by a common mouth, a little posterior to the minute papilla, the termination of the ureters. In the oviduct, just above its enlargement into the uterine cavity, there is only a slight trace of a glandular structure, in which respect the Torpedo appears equally to differ from the different species of Squalus and of Ray; all those which I have examined of either genus being possessed of a large glandular body in the situation mentioned.