I learned this catch from the same Osage Indian who taught me the Osage "Diamonds." I am told that it is also known in England.
String Figure Notation (SFN)
lH P1: rL ml-mt-pu lnTS, ex
rT pu rnLS: OA: T mo-th FN md-mt-up
re FN: re L, ex
By reason of the cross in the string in the First Position when you release the loops in the Third movement and draw the hands apart, each little finger loop becomes a slip noose around the opposite thumb. If the cross in the First Position be formed by the right thumb string passing over the left thumb string, you must take up the right palmar string first in forming Opening A.