It is no valid objection to this conclusion, that certain Brachiopods have been but slightly modified from an extremely remote geological epoch; and that certain land and fresh-water shells have remained nearly the same, from the time when, as far as is known, they first appeared.
Ondorio honen aurka ez da objekzio baliozkoa, zenbait brakiopodo antzina-antzinako geologi aldietatik hona oso gutxi eraldatu izana, eta lehorreko eta ur gezatako zenbait moluskuk, dakiguneino, lehenengoz agertu zirenetik hona ia berdin-berdin iraun izana.