Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 144 ('()MPA i;ATIVE AX ATOMV. The brain of Anura, and still more that of Gymnophiona, reaches a much higher stage than that of Urodeles, which retains to a greater extent a resemblance to the brain of Fishes. In Rana, moreover, the fore-parts of the hemispheres in the region of the oll-irtnry lobi-s an- fused together in the middle line; in Urodeles and Protopterus they remain distinct throughout. In < Vratodus the hemispheres are fused together dorsally, and in Ganoids
Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 144 ('()MPA i;ATIVE AX ATOMV. The brain of Anura, and still more that of Gymnophiona, reaches a much higher stage than that of Urodeles, which retains to a greater extent a resemblance to the brain of Fishes. In Rana, moreover, the fore-parts of the hemispheres in the region of the oll-irtnry lobi-s an- fused together in the middle line; in Urodeles and Protopterus they remain distinct throughout. In < Vratodus the hemispheres are fused together dorsally, and in Ganoids ventrally. Olfactory lobes may be largely (Amphibia, Polypterus, Ceratodus), only moderately (Sturgeons), or not at all (Protopterus)- developed. Reptiles. The brain of Reptiles reaches a considerably higher stage of development than that of the forms already described, and this is -71
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