AMPHIPOD • DICTIONARY ONE.COM • Definition of Amphipod

... processes, of which the males lay hold with the hands of the first pair." The development of these hook-like processes has probably followed from those females which were the most securely held during the act of reproduction, having left the largest number of offspring. Another Brazilian amphipod (see Orchestia darwinii, Fig. 8) presents a case of dimorphism, like that of Tanais; for there are two male forms, which differ in the structure of their chelae. (13. Fritz Muller, 'Facts and Arguments for Darwin,' 1869, pp. 25-28.) As either chela would ...

— The Descent of Man and Selection in Relation to Sex • Charles Darwin