Lectures on the comparative anatomy and physiology of the invertebrate animals, from notes taken by W.W. Cooper - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1846 Excerpt: ...prosencephala are smooth in Polypterus and Lepidosiren (fig. 54. p), and in the still more developed confluent mass 54 in the Sharks (fig. 55. P); the pro sencephala are, also, smooth in the Myxines, where they are relatively (111)-smallest. The comparative anaBrain of Lepidosiren. tomists, who have failed to recognise the true homology of the prosencephalon in Osseous Fishes, appear to have been misled chiefly by its small proportional size, which is commonly that exhibited in these preparations of the brain of the Cod (fig. 53, p), the Carp, and the Globefish; in some species the prosencephalon is still smaller, as in the Gar-fish, theHerring (fig.52, p), or the Lump-fish. The prosencephalon The preparations exhibited and here alluded to are those numbered 1309, 1309 k, 1309 m. equals the cerebellum in size, but is less than the optic lobes in the Perch and Bream; it equals the optic lobes, but is less than the cerebellum in the Eel; in the Stickleback and Gurnard the prosencephalon exceeds the cerebellum; still more so in the Lepidosteus, but is less than the optic lobes; in the Lucioperca, the Amblyopsis, and the Skate, neither the cerebellum nor the optic lobes are so large as the prosencephalon; in the large Sharks their united size scarcely equals that of the prosencephalon; and in the Salamandroid Polypterus and the Lepidosiren the prosencephalic lobes surpass all the rest of the brain, and manifest their true cerebral character and importance. In the Amblyopsis the relative magnitude of the prosencephalon is due to the diminution of the optic lobes in that blind fish; in the Plagiostomes it is due to absolute development; as it is, also, in the Polypterus and Lepidosiren, where the prosencephalon presents the closest similarity in form and structur...
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