water-crustacean

Updated: May 6, 2025

A little water-crustacean like Daphnia may swim against the tentacles of Hydra; it is stung to death by the minute cell-batteries which the animal possesses, and then in a mechanical way the tentacles transport the food to the mouth, through which it is passed inward to the digestive cavity.

Henry Edward Crampton - The Doctrine of Evolution: Its Basis and Its Scope