A short web article by Brian Lemin on the confusing names "cow-in-calf," "cow and calf," and "jack-in-the-box" for hollow-shanked lace bobbins that conceal a miniature bobbin. It reviews how nine published authors (Wright, Whiting, Freeman, Hopewell, Bellerby, Springett, Bullock) describe these bobbins, noting where they disagree on whether the small bobbin is loose or attached. Lemin proposes a standard nomenclature: cow in calf for the attached type, cow and calf for the loose type, and jack-in-the-box for the South Bucks "thumper." Photographs of bobbins and a reference list are included.