The bass flute is a member of the flute family pitched one octave below the concert flute. It  requires a J-shaped head joint to bring the embouchure hole within reach of the player. 
H4. Examples
* !asset #23642394: "wikimedia":[https://commons.m.wikimedia.org/wiki/File:Yamaha_Bass_Flute_YFL-B441S.tif#mw-jump-to-license]
bass flute