II. The Melon type.--This is seen on the columns of the lower order in SS. Sergius and Bacchus and on the columns of the narthex of S. Theodore, where they have been taken from an older building. The melon capital was probably not in use after the sixth century. III. The Bowl capital.--This type is used in the great order of S. Sophia at Constantinople. It has been thought peculiar to this church, but the capitals from S. Stephen at Triglia in Bithynia resemble those of S. Sophia closely. Only the peculiar volutes of the S. Sophia capitals are absent.[34] IV. The Byzantine or 'Pseudo-Ionic.'--This is found in the upper order of SS. Sergius and Bacchus, and in the narthex of S. Andrew. It is an early type, not used after the sixth century, and its occurrence in S. Andrew favours the early date assigned to that church. V. The Bird and Basket.--Found in Constantinople, only in S. Sophia. VI. The Byzantine Corinthian.--This is the commonest form of capital in the later churches, and must have been in continuous use from the earliest date. It occurs in S. John of the Studion, the Diaconissa, the Chora, and in many other churches. Here the classic form is accurately adhered to, but, as the curved abacus was unsuitable to the arch, a large splayed abacus or impost block is placed above the capital. It is a general feature of the Byzantine capital that it projects at no point beyond the impost line of the arch, thus differing both from the classic and the Gothic forms. VII. The Windblown Acanthus.--This is found in the churches of Salonica and Ravenna. Three examples are mentioned as seen in Constantinople, two near the Diaconissa, forming bases for the posts of a wooden porch to a house; one is the cistern commonly known as the cistern of Pulcheria. _Window Capitals._--In shafted window of several lights, the impost piers between the arches are of the full thickness of the wall, but are very narrow from side to side. Similarly the shafts are almost slabs placed across the wall, and sometimes, as in the Pammakaristos, are carved on their narrow faces. The capitals are cubical, of slight projection at the sides, but spreading widely at the ends, while the bases closely resemble capitals turned upside down. As with columns, the joints at base and necking are bedded in sheet lead. _Floors._--The floors are usually of thick red brick tiles, some .31 cm. square, or, as in S. Theodore, hexagonal, .34 cm. across by 45 cm. from point to point. Marble floors were used when possible, inlaid with patterns, or in slabs surrounded by borders of coloured marbles, as is still seen in a portion of the floor in the Pantokrator (Fig. 76).