Cf. Lords of Creation, pl. 65
Shell pectorals are often depicted on Jaina figures (fig. 1) and in the corpus of painted ceramics. Mayan nobility are depicted for the most part solely wearing an ex, loincloth, but also wore necklaces with pectorals of carved shell to signal their status and wealth. Here the single arm bent around a glyph indicates that this is an 'ancestoral pectoral' depicting the head of an ancestor as a parial, smoky being. The shell pendant would have been worn with the ancestor facing down.
See front cover