From the Stitch Description: Here, the famous Horseshoe Pattern is varied in the simplest possible way -- with a half-drop -- to make a quite different lace. Shell Lace is easy to work, and very attractive as an allover fabric. A discerning eye may notice in it an element of the Grapevine Pattern, to which it is related in form if not in technique.

Location of Stitch: Page 209 from A Treasury of Knitting Patterns.