But as these animals and their spawn are immediately killed (with the exception, as far as known, of one Indian species) by sea-water, there would be great difficulty in their transportal across the sea, and therefore we can see why they do not exist on strictly oceanic islands.
Baina gesalak animaliok eta berauek erruniko arrautzak berehala hiltzen dituenez gero-Indiako espezie bat izan ezik, ezagutzen duguino-, zailtasun handia luke haiek itsasoan zehar garraiatzeak, eta horrexegatik uler dezakegu zergatik ez diren benetako irla ozeanikoetan.