Graves of a particular form are said to occur sometimes in groups occupying distinct parts of the cemetery, but the observations are not sufficiently definite to be of value. The graves vary considerably in form, construction, and depth, and are classified variously by explorers. In the Bugaba cemetery Mr. Merritt found two well marked varieties, the oval and the quadrangular, reference being had to the horizontal section. The oval grave pits were from 4½ to 6 feet deep and from 3 to 4 feet in greatest diameter. A wall of rounded river stones 2½ to 3 feet high lined the lower part of the pit, and from the top of this the entire space was closely packed with rounded stones. Within the faced up part of this cist the remains of the dead, the golden figures, pottery, and implements had been deposited. This form is illustrated in Fig. 1 by a vertical section constructed from the description given by Mr. Merritt. [Illustration: Fig. 1. Section of oval grave.] The quadrangular graves were constructed in two somewhat distinct ways. One variety was identical in most respects with the oval form illustrated above. They were sometimes as much as 6 feet deep and frequently 4 by 7 feet in horizontal dimensions. In the other form a pit 4 by 6½ feet in diameter was sunk to the depth of about 3 feet. Underneath this another pit some 2 feet in depth was sunk, leaving an offset or terrace 8 or 10 inches in width all around. The smaller pit was lined with flat stones placed on edge. In this cist the human remains and the relics were placed and covered over with flat stones, which rested upon the terrace and prevented the superincumbent mass, which consisted of closely packed river stones, from crushing the contents. A section of this tomb is given in Fig. 2, also drawn from the description given by Mr. Merritt. [Illustration: Fig. 2. Section of a quadrangular grave, showing the surface pack of river stories and the positions of the slabs and objects of art.] [Illustration: Fig. 3. Grave with pillars, described by De Zeltner.] [Illustration: Fig. 4. Compound cist, described by De Zeltner.]