M. Mariette cites, in support of this conjecture, certain other structures of a similar character, such as the large tomb situated near the south-eastern angle of the second pyramid at Gizeh, and the little monument which is called the Pyramid of Righa. From these he concludes that the principles of the mastaba and the pyramid were sometimes combined under the ancient empire. The royal tombs in the Memphite region were not always pyramids, they were sometimes composed of a mastaba and of one or more high square tower-like erections upon it, the whole ending in one of those small pyramids which we call pyramidions. This type allowed of numerous combinations, many of which are to be discovered in the monuments of a later period. The pyramid was employed as a terminal form throughout the whole of Egyptian history. Both Thebes and Abydos offer us many examples of its use, either in those sepulchral edifices which are still extant, or in the representations of them upon bas-reliefs. But the pyramid properly speaking was confined to the Memphite period. The princes of the twelfth dynasty seem to have constructed some in the Fayoum. The pyramids of Hawara and Illahoon correspond to those which, we are told, were built in connection with the labyrinth and upon the islands of Lake Mœris respectively. These, so far as we can judge, were the last of the pyramids. There are, indeed, in the necropolis of Thebes, upon the rocks of Drah-abou'l-neggah, a few pyramids of crude brick, some of which seem to belong to Entefs of the eleventh dynasty; but they are small and carelessly constructed.[200] When the art of Egypt had arrived at its full development, such purely geometrical forms would seem unworthy of its powers, as they did not allow of those varied beauties of construction and decoration which its architects had gradually mastered. [200] LEPSIUS, _Denkmæler_, part i. pl. 94. RHIND, _Thebes, its Tombs and their Tenants_, p. 45. MARIETTE, _Voyage dans la Haute-Égypte_, vol. ii. p. 80.