The original text says:  Progressive 3 Cpl. dance in a 4 Cpl. Longwise Set.  <...> Can also be danced as a 3 couple dance with 3rd & 1st Cpl. circling to the Lt in bars 21 to 24, 3rd Cpl. opening out for the 6 hands round in bars 25 to 32.

The E-crib gives the 3C/4C version as the default, whereas MiniCrib has the 3C set version. The diagram shows both.