Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The sixgill sharks, Hexanchus, are a genus of deepwater sharks in the family Hexanchidae. These sharks are characterized by broad pointed heads, six pairs of gill slits, comb-like lower teeth, and a long tail. It can grow up to 4.85 m (16 ft) long and weigh over 600 kg (1320 lb). Cow sharks, or the Hexanchidae, are a family of sharks characterized by an additional pair or pairs of gill slits. There are currently known to be four species in three genera, Heptranchias, Hexanchus and Notorynchus.

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