Abstract
IT is regarded in text-books1 as a well-established fact that the adhesive organ of the “sucking-fish” (Echeneis and Remora, etc.), and a somewhat similar structure in Pseudecheneis and certain other freshwater fish, functions as a “sucker”; in other words, it enables the fish to adhere by the creation of a vacuum, or at any rate a partial vacuum, between the ridges and the rim of which it is constituted. Observations on Pseudecheneis and its allies in natural conditions led both Dr. Annandale and myself to doubt whether this belief is well founded.
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