So it is with the inhabitants of lakes and marshes, excepting in so far as great facility of transport has allowed the same forms to prevail throughout large portions of the world.
Gauza bera gertatzen da laku eta urtegietako biztanleekin ere, garraio aukera erraz-errazen batek forma berak munduko eremu zabaletara hedatu ez dituen heinean behintzat.