Almost all oceanic islands, even the most isolated and smallest, are inhabited by land-shells, generally by endemic species, but sometimes by species found elsewhere striking instances of which have been given by Dr. A.A. Gould in relation to the Pacific.
Irla ozeaniko gehientsuenetan, txikien eta isolatuenetan ere, lehorreko moluskuak bizi dira, espezie endemikoak eskuarki, baina baita beste edozein lekutan aurki daitezkeen espezieak ere, A.A. Gould doktoreak Ozeano Bareari buruz aurkeztu dituen adibide aipagarriak lekuko.