When I placed this animal in my cabin it remained very quiet, not making so much noise as the last; but, a few days after, it became so very vicious, not suffering any one to approach or touch it, without spitting, growling, and fighting so furiously, that I at last was obliged to destroy it, preserving the skin in a dried state for stuffing, and the body in spirits for a future dissection. LUMINOSITY OF THE OCEAN. (_See_ page 35, vol. i.) Mr. F. D. Bennett, exhibited, at a meeting of the Zoological Society, on the 25th of June, 1833, several specimens of a species of Pyrosoma, captured by him, on the 6th of September, 1832, at sea, in latitude 1° 41′ north, longitude 11° 56′ west. Between 2 and 4 A.M. the sea, having been two hours before less luminous than usual, presented one mass of bright phosphoric light, extending to a considerable distance around the vessel. The extensive field of bright luminous matter emitted so powerful a light as to illuminate the sails, and to permit a book of small print to be read with facility near the windows of the stern cabins. Above this luminous field numerous sea fowl were hovering in search of their prey. The light appeared to be entirely owing to the Pyrosomata. Specimens taken from the sea and placed in a vessel containing sea water, ceased altogether to emit light, or emitted it but sparingly while they remained at rest. On the water, however, being agitated, or when one of the masses of animals was taken into the hand, the whole became instantly illuminated by myriads of bright dots, much resembling in hue the points on the elytra of a diamond beetle (_Curculio imperialis_, Fab.) The Pyrosoma, thus enveloped throughout its whole extent in a flame of bright phosphorescent light gleaming with its peculiar hue, presented a most splendid spectacle; the light shed by it was sufficient to render objects distinctly visible in every part of an otherwise dark room. If long retained in the hand, or returned to a quiescent state in the water, the luminous spots gradually faded, and no light was visible until the animal was again disturbed, when the illumination instantly returned with all its vivid splendour. After death it emitted no light.