A comparative study of the brains in pleuronectidae

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Abstract
The microscopic and macroscopic structure of the brains is correlated with the feeding habits of the spp., which fall into 4 groups: 1. The sole type, which in some respects resembles that of the eel, is characterised by large olfactory, small optic, small facial, but large somatic-sensory lobes; and a central acoustic lobe associated with the habit of sand-tapping for worms; the infundibulum is long, the pituitary stalked, and the pars nervosa well developed. 2. The plaice type, including such other bottom-feeders as the dab, the lemon sole and witch, possesses moderate sized olfactory lobes, large optic lobes, and well-developed facial lobea; the pituitary is of moderate size and the pars nervosa is well developed. 3. The turbot type, including the brill and megrim, all predatory feeders, possesses well-developed optic lobes, large somaticsensory and small facial lobes; the pituitary is very large. 4. The halibut type, which is also predatory, possesses large optic and prominent somatic sensory lobes; the infundibular lobe is much elongated and the glandular portion of the pituitary is well developed as in group 3, but it differs in the arrangement of the tubules.

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