The surface of the walls between the pilasters is also ornamented with a number of rectangular depressions, resembling the sunken ends of beams.

The doorway, which looks north, towards the tombs, is not at the bottom of the building, but half-way up its side, and must have been reached either by a ladder or by a flight of steps.

It leads into a square chamber, twelve feet wide by nearly eighteen high, extending to the top of the building, and roofed in with four large slabs of stone, which reach entirely across from side to side, being rather more than twenty-four feet long, six feet wide, and from eighteen inches to three feet in thickness.

[PLATE LIII., Fig.

3.] On the top these slabs are so cut that the roof has every way a slight incline; at their edges they are fashioned between the pilasters, into a dentated cornice, like that which is seen on the tomb.