Gunther has recently shown that about thirty per cent of the fishes are the same on the opposite sides of the isthmus of Panama; and this fact has led naturalists to believe that the isthmus was formerly open.
baina Günther doktoreak frogatu du oraintsu arrainen ehuneko hogeita hamar inguru berdinak direla Panamako istmoaren alde bietan; eta honek istmoa behiala zabalik zegoela uste izatera eraman ditu naturalistak.