"Crotchet" is a somewhat archaic term for a quarter note, now only used primarily in Britain. A quaver is an eighth note, a minim is a half note, and a breve is a double whole note.
OOOOOOOOOOOOOOOooooooooooooooooo - now see...Jack Aubrey would get a big kick out of that!!!!!!! That's funny!!!