Represented on the valves of a huge shell, with the erect torso and scaly legs of a sea monster, the Triton stands imposingly with his head bent back in an effort to blow into the large buccina (or twisted shell) that he supports with his arms raised upwards and from which the water that irrigates the whole work comes out copiously. Expression of the new Baroque conception of space, in the fountain the sculptural part includes and completely absorbs the same architectural structure: the shell on which the triton rests is in fact the upper basin of the fountain, and the baluster at the base is replaced by four dolphins with intertwined tails, between which are placed the papal coats of arms with bees, heraldic symbol of the Barberini family.