There you go...
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How do octopuses reproduce?
The male has a modified arm called a hectocotylus that he stretches out to the female and inserts into her mantle cavity. The arm transfers spermatophores from a storage sac into her mantle cavity near the oviduct where the eggs are fertilized. Shortly after the eggs hatch, the female dies.
from
http://www.nmnh.si.edu/iz/cephalopods.htm
OK so not as fully descriptive as really necessary but I
really should be at work by now
HTH
Steve