262
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THE
FISHES
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toïcom‘e upunder the boat, andthe issue was very doubtful
for- mOre than twenty minutes.
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On the other hand, the loss of ns can in no case be
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regarded as an adaptation to anything and just as littleas the
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result of disuse.
If it had ventral ns, the Eel could make
as good use of them as other shes which wander out On
land,and we cannot believe that it has lost them thr0ugh
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crawling through holes and narrow pipes. The explanatioh
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