. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. NERVOUS SYSTEM OF VERTEBRATES. 77 Owen's Classification of Mammals.—Professor Owen classified mammals by this test into four groups: i. Archencephala, or ruling brain. In this subclass he placed man alone. 2. Gyrencephala, or convoluted brains. In this he placed all the larger mammals. 3. Lissencephala, or smooth brains. In this he placed all the rodents and some other small mammals. 4. Lyen- cephala, or separated brains. The lowest mammals, such as insecti- vores and marsupials,
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. NERVOUS SYSTEM OF VERTEBRATES. 77 Owen's Classification of Mammals.—Professor Owen classified mammals by this test into four groups: i. Archencephala, or ruling brain. In this subclass he placed man alone. 2. Gyrencephala, or convoluted brains. In this he placed all the larger mammals. 3. Lissencephala, or smooth brains. In this he placed all the rodents and some other small mammals. 4. Lyen- cephala, or separated brains. The lowest mammals, such as insecti- vores and marsupials, he placed in this. This attempt is interest- ing, but the classification can not be regarded as natural, for the earliest animals of all these sub- classes, except one—man—have smooth brains. In the average bird (Fig. 43) not only is the olfac- tory lobe wholly uncovered in front and the cerebellum behind, but also the optic lobes are at least half un- covered. B A. Fig. 42.—Brain of Dasyurus ursinus, showing expo- sure of the optic lobes, ol. (From Owen.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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