The calidarium had the labrum at one end, and the alveus was in one side of the room.
At one end of the caldarium we find the bath basin, alveus; at the other is the support of the labrum, which has disappeared.
At the other end stood the large hot water tank (alveus), in which the bath was taken by a number of persons at a time.
The square basin (alveus or baptisterium) which served for the warm baths was of marble.
This alveus would accommodate eight bathers, that in the men's caldarium perhaps ten.
