Note 2808 — BOOK IX. THE NATURAL HISTORY OF FISHES. (continued 2)

Or wheel-fish: from the Greek τροχὸς, “a wheel.” It is not clearly known what animal he alludes to under this name. Snails, Cuvier says, are hermaphrodites, and so is the helix, but still they require sexual connection for the purposes of reproduction. The greater part of the marine uni-valves, on the other hand, are of separate sexes; but the organ of the male being proportionally of great length, and coiled in part beneath its mantle, this fact may very possibly have given rise to the notion here mentioned by our author, that the animal impregnates itself.