Dam of Sister to Routh's Surley (by [Hutton's] Surley) through which the maternal line of the family continues

Dam of [Hutton's] Blacklegs, sire of The Ruby Mare, dam of Marske, sire of the great racehorse and sire Eclipse, through which the Darley Arabian direct male line was perpetuated to the present day in approximately 95% of all the thoroughbreds in the world; and dam of Sister to Routh's Surley which is the dam of the successful stallion [Hutton's] Spot

This mare was not sired by the top class racehorse [Rutland's] Coneyskins, as stated by the GSB, but by [Hutton's] Coneyskins, a different, earlier foaled, horse

For research see:-
http://www.bloodlines.net/TB/Bios2/Coneyskins.htm
http://bloodlines.net/highflyer/investigation8.htm