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File:Scyliorhinus retifer embryo.JPG|[[Aristotle's biology|Aristotle]] recorded that the [[embryo]] of [[Mustelus canis|a dogfish]] was attached by a cord to a kind of placenta (the [[yolk sac]]).
File:Scyliorhinus retifer embryo.JPG|[[Aristotle's biology|Aristotle]] recorded that the [[embryo]] of [[Mustelus canis|a dogfish]] was attached by a cord to a kind of placenta (the [[yolk sac]]).
File:Challenger.jpg|{{center|{{HMS|Challenger|1858|6}} during its [[Challenger expedition|pioneer expedition]] of 1872–76}}
File:Challenger.jpg|{{center|{{HMS|Challenger|1858|6}} during its [[Challenger expedition|pioneer expedition]] of 1872–1876}}
</gallery>
</gallery>
== References ==
== References ==