Posted on 09/01/2016 1:14:43 PM PDT by nickcarraway
Dogfish, both smooth and spiney, bear their young aplacental aviviporously, that is, live with a yolk sack.
What you showed is a skate egg case.
https://www.google.com/search?q=skate+eggs+case&rlz=1T4GGNI_enUS569US569&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjqo6DsyPHOAhXFKyYKHRmsBEoQsAQIHQ&biw=1366&bih=641
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