. Sull'anatomia dei vertebrati [risorsa elettronica] . Superficie superiore del cervello, lxx di Dasyure. Sotto la superficie del cervello, lobi di Porcupine., fig. 142, c, sono mediali in posizione e divisi da un transverseforrow. I lobi cerebrali, ib.b, non sono solo uniti da un tondo 144 145 a. Cervello di Lyencephalous, t^raascolomy di Wombat fuso), lxx*. Corpus callosum, cervello di Beaver. lxx commissure, ma da una lira e hippocampal commissure, fig.144, m ; da cui si sviluppa, nella maggior parte della classe, 270 ANATOMIA DI VERTEBRATI. 146 a i corpus callosum o grande commissura, fig. 145, /. Il rinoceronte,

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. On the anatomy of vertebrates [electronic resource] . Upper surface of brain, Dasyure. lxx Under surface of brain, Porcupine. lobes, fig. 142, c, are medial in position and divided by a transversefurrow. The cerebral lobes, ib. b, are not only united by a round 144 145 a. Lyencephalous brain, Wombat t^rhascolomys fused), lxx*. Corpus callosum, brain of Beaver. lxx commissure, but by a lyra and hippocampal commissure, fig.144, m ; from which is developed, in the majority of the class, 270 ANATOMY OF VERTEBRATES. 146 a i corpus callosum or great commissure, fig. 145, /. The rhinen-cephalon, fig. 142, «, is in contact with the prosencephalon, b, and sends off numerous olfactory nerves which perforate af cribriform plate of the prefrontal. § 173. Mammalian Subclasses.—The primary subdivisions ofthe present class are characterised by conditions of the brain.1 When the hemispheres are connected by the 6round commis-sure and 4 hippocampal commissure only, fig. 144, m, this cerebralcondition is associated with the absence of a vascular chorion orplacenta, and with prematurely born young, compared with therest of the class (fig. 138 shows the natural size of the new-bornKangaroo of the largest species). The cerebral hemispheres are usually without folds, an

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