25. _a._ Skull. _b._ Limestone foundation. _c._ Excavation. _d._ Grooved flag in situ. _e._ Projecting lip 78 26. Circular openings leading into natural cavity 80 27. Ground plan of chultun 82 28. Ground plan of Mound No. 9 84 29. Wall construction of Mound No. 9 84 30. Details of Mound No. 9 85 31. Obsidian object and pottery vase from Mound No. 10 87 32. Obsidian arrowhead from Mound No. 10 89 33. Flint object from Mound No. 10 89 34. Obsidian object from Mound No. 10 90 35. Inscription on mask, plate 16, _b._ 91 36. Inscription on ax head, plate 16, _c._ 92 37. Flint spearheads 94 38. Flint objects 94 39. Devices scratched on stucco in aboriginal building 95 40. Eccentrically shaped implements found at summit of mound 96 41. Flint object found at base of stela 96 42. Flint object found at base of stela 96 43. Flints found in ruins at Naranjo 97 44. Objects from Benque Viejo 98 45. Obsidian objects found in a mound near Benque Viejo 99 46. Flint object from Seven Hills 100 47. Horseshoe-shaped flint object found near San Antonio 100 48. Figure from River Thames, near London 101 49. Flint objects from Tennessee 102 50. Flint objects from Italy 103 51. Small cup-shaped vase from Mound No. 15 104 52. Objects from Mound No. 15 104 53. Conventionalized representation of bird on vessel shown in plate 17 106 54. Decoration on vessel shown in plate 17 106 55. Perforated beads found in Mound No. 16 107 56. Jadeite beads found in Mound No. 16 107 57. _a._ Circular shell disks from Mound No. 16. _b._ Greenstone ear plugs from Mound No. 17 108 58. Obsidian disk inserted in tooth of skeleton found in Mound No. 17 109 59. Bird carrying a fish outlined on shallow plaque found in Mound No. 17 110 60. Cylindrical pottery vase found in Mound No. 17 110 61. Larger pottery vase found in Mound No. 17 111