Posted by John on Thursday, July 9, 2009 at 10:10am.
Common usage for the plural of fish, starfish, and jellyfish is the same: fish, starfish, and jellyfish.
So 1) is correct. I remember in the King James version of the Bible, fishes was plural, but no longer.
etc. is an abbreviation and has a period following.
Since "etc." is an abbreviation for the Latin, "et cetera," it is typically followed by a period.
I hope this helps a little more. Thanks for asking.
In addition to adding a period after "etc." you also need to add a comma since you are ending a series.
"...sea urchins, etc., in the ocean."
From http://www.bartleby.com/141/strunk.html
in Section 3:
"The abbreviations etc. and jr. are always preceded by a comma, and except at the end of a sentence, followed by one."
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