. 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, , 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,
. 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, , 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 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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