22. =Keel= (_Gonys_). The lower outline of the bill viewed
laterally; extending from the angle of the chin to the tip.
23. =Angle of the chin= (_Angulus mentalis_). The point where the
two branches, or rami, of the lower jaw
24. (=Gnathidia=, _Rami_) unite, thence to be continued to its tip
as the