In Polytoreutus, also, spermatophores have been found in these spermathecal sacs. [Please select]
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The contrivances for these purposes are sometimes wonderfully complex, as with the spermatophores of the Cephalopoda. [Please select]
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The spermatophores of the Cephalopoda are wonderfully complex structures, which were formerly mistaken for parasitic worms; and the spermatozoa of some animals possess attributes which, if observed in an independent animal, would be put down to instinct guided by sense-organs,--as when the spermatozoa of an insect find their way into the minute micropyle of the egg. [Please select]
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