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Wikipedia definition
1. HectocotylusA hectocotylus is one of the arms of the male of most kinds of cephalopods that is modified in various ways to effect the fertilization of the female's eggs. It is a specialized, extended muscular hydrostat used to store spermatophores, the male gametophore. Males generally form a new hectocotylus in each new season. Among Decapodiformes (ten-limbed cephalopods), generally either one or both of arms IV are hectocotylized; in incirrate octopuses it is one of arm pair III.
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