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The question arose, however, whether the tail and these flaps acted as a sucker which aided in the adhesion. The flaps were therefore cut off with scissors an operation which caused practically no pain or injury to the fish and it adhered afterwards quite as well as when the fin-flaps were intact.
No use is known for any of the other specific characters, which tend in each case to form a series. Thus in size norvegicus is the smallest, unimaculatus larger, and punctatus largest, the last reaching a of 8-1/2 inches. The subcaudal fin-flaps are developed in norvegicus, most in punctatus; each has four rays in norvegicus and unimaculatus, six in punctatus.
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