Salzenberg also figures two capitals, now on the porphyry columns at the east porch. These are comparatively small, and may possibly have belonged to some position in the interior of the church, such as Justinian’s first ambo. The form is that of a basket with four doves perched on the rim, and crosses between. Doves associated with crosses symbolized the Church. Now in St. Clemente at Rome there are two capitals of this kind which belonged to the ciborium, set up as the inscription shows while Hormisdas was pope (514-523), they are figured by Cattaneo, Fig. 7, who says they obviously were sculptured by Greek chisels. It is thus extremely possible that ours may have been late additions to the pre-Justinian church, where they also may have belonged to the ciborium. Rohault de Fleury believed that this form of capital was intended to represent an offerings basket. [Illustration: FIG. 57.--Rudimentary Form of Capital in Gynaeceum. Type IV.] To these Bird and Basket capitals, type V., may be added varieties of the great class of derivatives from the Corinthian of which this is in fact one. These were in general use before the block type of capital was developed. We will here only mention two of these acanthus capitals. Those in which the leaves are set upright on the stem of the shaft we will call Byzantine Corinthian and type VI. Those in which the leaves turn over and bend round the capital we will, with Mr. Ruskin, call “Wind-blown acanthus,” and type VII. _Distribution and Dates of Capitals._--We have referred before to our belief that Constantinople was a marble working centre from which sculptured marbles were dispersed to all parts of the Roman world. Having the chief types of Byzantine capitals before us it will be convenient to consider this more fully. We suppose that as white marble had to be bought in any case, the custom grew up of obtaining the capitals fully wrought. Importation was, of course, a general antique practice in regard to figure sculpture, columns, and other objects of marble. Proconnesian marble seems to have been the common stone of Constantinople so that it is used for the columns and capitals of the cisterns. We believe that careful examination of the capitals at Ravenna, Parenzo, and other Byzantine centres will show that they are in the main of this material. As to design the capitals lying neglected about the city, together with those _in situ_ in the churches and cisterns, furnish a perfect museum of the types with which others dispersed through the whole area of the empire agree in the minutest particulars of design and workmanship. To take the types we have mentioned: