This six-gill shark (Hexanchus) was filmed during a submersible dive off the northeast coast of Molokai at a depth of 1000m (3280ft).    From Wordnik.com.  [Six-Gill Shark « Isegoria] Reference

Hexanchus, That is horrifying!.    From Wordnik.com.  [All articles at Blogcritics] Reference

Hexanchus, 172.    From Wordnik.com.  [On the Genesis of Species] Reference