A short and narrow passage led to an oblong chamber upon which it opened at right angles, so that the place is in shape of a T (fig.

121).
The end wall is generally smooth; but sometimes it is recessed just opposite the entrance passage, and then the plan forms a cross, of which the head is longer or shorter (fig.

122).

This was the ordinary arrangement, but the architect was free to reject it, if he so pleased.
Here, a chapel consists of two parallel lobbies connected by a cross passage (fig.

123).