From parallel two faced lines: Ends facing out do a Split Circulate. Centers facing out do a Cross Circulate. Ends facing in do a regular Circulate. Centers facing in Circulate on the diagonal to each other's places in the opposite wave. Finishes in parallel waves.
Al Donahue 1975
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.