. Beginners' Zoology . Fig. 222. —Brain ofPerch, from above. K, end of nerve of smell;au, eye; v, z, ni, fore,mid, and hind brain;//, spinal bulb; r, spi-nal cord. FISHES 119 front of the optic lobes lie the two cerebral lobes, or the small olfactory lobes are seen (Fig. 224) in front of the cere-brum. The olfactory nerves may be traced to the nostrils. Behindthe optic lobes (mid brain) is the cerebellum (hind brain) and behind it is the medulla oblongataor beginning of the spinal cord. Fig. 224. —Brain of Perch,from Fig. 223. —Brain of Perch,side view. If you take the eye
. Beginners' Zoology . Fig. 222. —Brain ofPerch, from above. K, end of nerve of smell;au, eye; v, z, ni, fore,mid, and hind brain;//, spinal bulb; r, spi-nal cord. FISHES 119 front of the optic lobes lie the two cerebral lobes, or the small olfactory lobes are seen (Fig. 224) in front of the cere-brum. The olfactory nerves may be traced to the nostrils. Behindthe optic lobes (mid brain) is the cerebellum (hind brain) and behind it is the medulla oblongataor beginning of the spinal cord. Fig. 224. —Brain of Perch,from Fig. 223. —Brain of Perch,side view. If you take the eyeball for comparison, is the whole brain as largeas one eyeball? (Fig. 222.) If you judge from the size of the parts ofthe brain, which is more important with the fish, thinking or per-ception? Which is the most important sense? The scales along a certain line on each side of the fish, calledthe lateral line, are perforated over a series of lateral line senseorgans, supposed to be the chief organs oi touch (see Fig. 209). Questions. — Which of the fins of the fish have a usewhich corresponds to the keel of a boat. The rudder} A
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