Chalumeau

The chalumeau is a single-reed woodwind instrument of the late baroque and early classical eras. The chalumeau is a folk instrument that is the predecessor to the modern-day clarinet. It has a cylindrical bore with eight tone holes (seven in front and one in back for the thumb) and a broad mouthpiece with a single heteroglot reed (i.e. not a continuous part of the instrument's body) made of cane. Similar to the clarinet, the chalumeau overblows a twelfth. (source)