right at you...:
I got these last two just google imaging them... I like how one has the hunchback and the other the ... bucket belly?
Apparently the largest species can get up to two feet, although most are smaller.
http://en.wikipedia.org/wiki/Marine_hatchetfish
There's a (rather short) wiki.
I am quite sure that that first image is the fish trying to re-create the drama icon of two masks:
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