Beneath this second chamber a third was discovered, roofed in with rough flags, of the same dimensions as the other two. The floor of this chamber was cemented over; nothing except limestone blocks and mortar was found between it and the bottom of the mound. Upon the floor lay a solitary plaque, of a deep reddish-yellow color, the upper surface divided by black lines into four equal spaces, in each of which was crudely outlined in black a fish, probably meant to represent a stone bass. On digging into the summit of the mound outside the area occupied by the chambers, the following objects were brought to light: (a) A cylindrical vase of light, thin, well-made pottery, 16-1/2 cm. high by 13 cm. in diameter, painted light yellow throughout and finely polished (fig. 60). Upon one side of the vase, within an oblong space outlined in black, are a number of curious mythological animals, above which is a row of six glyphs, seemingly explanatory of the picture beneath (pl. 19, _a_). Both animals and glyphs are very carefully executed in red, black, and brown, on a yellow background. The lowest figure on the right somewhat resembles that on a vase in the American Museum of Natural History,[45] upon which the Long-nosed god is associated with bulblike objects, flowers, and a bird (probably a pelican). On this vase the Long-nosed god is seen with a bulblike object, possibly a root, from which project interlacing stalks, at the ends of which are water-lily buds. [Illustration: PLATE 19 a. DECORATION ON VASE SHOWN IN FIGURE 60 b. DECORATION OF VESSEL FROM MOUND NO. 17] Above these is a bird, possibly a sea hawk. The whole connotes water, or fertility. (b) A second vase, similar in shape, but somewhat larger (fig. 61), is painted yellow and polished throughout. Upon this is depicted a cruciform object, with outgrowths from the upper and lateral limbs of the cross, probably a highly conventionalized tree. (c) A shallow circular plaque, 36 cm. in diameter, painted light yellow, and polished throughout. Upon its upper surface is painted, in red and black, a coiled plumed serpent (fig. 62), doubtless intended to represent Cuculcan, the "Feathered Serpent." (d) Two circular objects of polished greenstone, somewhat resembling broad-brimmed hats from which the crowns have been removed (see fig. 57, _b_). Each has on the upper surface of the brim a small ovate piece of mother-of-pearl, firmly cemented to the stone. These objects were probably used as ear plugs; with them were five small perforated spherical beads of polished greenstone. [Illustration: FIG. 61.--Larger pottery vase found in Mound No. 17.] [Illustration: FIG. 62.--Coiled plumed serpent painted on plaque found in Mound No. 17.]