The simplest form of chamber-tomb consists of a narrow corridor or δρόμος leading into a larger chamber; next, the δρόμος opens into a square or rectangular vestibule, round which various side-chambers are attached; finally, the tomb assumes the form of a vast subterranean edifice composed of several wings, and used for more than one corpse—in fact, a “family vault.” While on the one hand the ceramic types of the Villanuova period still linger on, as in the retention of _ossuaria_ for the receipt of ashes, on the other the painted Greek vases and the local _bucchero_ wares increase more and more, and altogether there is a great advance in the direction of variety and richness. This period saw not only the general introduction of the wheel into Etruria, but also the introduction of the alphabet of Western Greece, through Cumae. A vase of _bucchero_ ware found at Vetulonia bears an Etruscan inscription, which can hardly be much later than 700 B.C.,[2280] and we have already seen an instance on a vase from Caere. In the earlier chamber-tombs no _bucchero_ is found, and the pottery is of the same types as in the trench-tombs; but with the enlarged arrangement of the tomb come the Corinthian vases of Orientalising style, to be followed later by the Ionian and later Corinthian fabrics, and finally by the Athenian wares. The vestibule disappears after the sixth century, and all later tombs have the simple δρόμος. The typical contents of a chamber-tomb are, as regards local pottery, in the earlier tombs _impasto Italico_ wares, in the later _bucchero_. The former is hand-made, the shapes similar to those found in the trench-tombs—_i.e._ pots incised with zigzags, circles, and other patterns, or painted in white. The latest varieties are wheel-made, of _bucchero_ forms. The latter wares, which are much more numerous, are evolved from the _impasto_: (1) by the use of the wheel; (2) by the introduction of the furnace; (3) by extensive imitation of Greek ceramic and metal forms. The earliest _bucchero_ vases at Vulci and Corneto synchronise with Corinthian pottery of the middle style, about 630-600 B.C., and they last down to the end of the fifth century.