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PHYLUM CHORDATA 



275 



by two pairs of lymph-hearty one situated beneath the supra- 

 scapulae, the other beside the posterior end of the urostyle. 



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Nervous System. The brain (Fig. 946) has a very small cere- 

 bellum, large optic lobes, a well-developed diencephalon, and large 

 hemispheres and olfactory bulbs, the latter fused in the median 



