The next shield shown (pl. XXV) consists of a half section only. It was slightly larger than any other shield in the collection, having a diameter of 15¼ inches and a thickness of 1 inch. It was a sun shield, and had four pointers identical with those on the famous calendar stone of the Aztecs. There are traces of a paper band glued around the outer edge; the black line has already been referred to. The central disc, with the white lines made of very tiny bits, is similar to the central part of the shield on pl. XXIII. [Illustration: PL. XXXI HEAD WITH HEAD-PIECE OF WOOD WITH MOSAIC DECORATION NATIONAL MUSEUM, COPENHAGEN] [Illustration: PL. XXXII A JAGUAR HEAD OF WOOD WITH MOSAIC DECORATION ETHNOGRAPHICAL MUSEUM, BERLIN B ANIMAL HEAD OF WOOD WITH HUMAN FACE IN OPEN JAW WITH MOSAIC DECORATION NATIONAL MUSEUM, COPENHAGEN] [Illustration: PL. XXXIII A ANIMAL HEAD OF WOOD WITH MOSAIC DECORATION STATE NATURAL HISTORY MUSEUM, VIENNA B MONKEY HEAD OF WOOD WITH MOSAIC DECORATION BRITISH MUSEUM, LONDON] [Illustration: PL. XXXIV A TWO-HEADED JAGUAR FIGURE OF WOOD WITH MOSAIC DECORATION ETHNOGRAPHICAL MUSEUM, BERLIN B BIRD HEAD OF WOOD WITH MOSAIC DECORATION MUSEUM, GOTHA] [Illustration: PL. XXXV ANIMAL FIGURE OF WOOD WITH MOSAIC DECORATION BRITISH MUSEUM, LONDON] One of the most interesting specimens is reproduced in pl. XXVI, which is 14⅞ inches in diameter. This is the only shield of the series bearing a figure. It had four pointers, which suggest a sun disc, but the symbol seems clearly to be a conventional cross-section of a conch-shell, the well-known and often delineated symbol of Ehecatl, god of the air, one of the various attributes of the god Quetzalcoatl. In this example the light pieces of stone are larger than in any other piece, but they are cut exceedingly thin. Around the outer edge of the mosaic is a faint incised line, and three lines may be seen projecting from the pointers, showing that the artist carried his guide-lines beyond the zone finally used. The circular line is so regular that there is no doubt that the workman used our methods, tying a piece of cord to an awl and working from the exact center of the shield. The two fragments on pl. XXVII and XXVIII are the same size--15 inches in diameter. They are similar in workmanship; the special feature, the sprinkled outer band, has already been alluded to. In the first specimen an irregular cavity on the upper face was apparently filled in with cement, traces of which remain. The two holes in each shield are modern, but the two specimens came to us joined with leather strings. They are, however, sections of separate shields.