On public or festal occasions the Etruscan noble wore, besides the tebenna, a bulla, or necklace of bullae, and a wreath, corona Etrusca.
Scilicet constitutiones, bullae, litterae apostolicae, epistolae, vols.
The tail and ears are generally very long; while, in correlation with the size of the latter, the auditory bullae of the skull are also large.
The hollow tympanic bullae, they have the clavicles imperfect, the first front toe opposable to the rest, the temporal region of the skull roofed with bone, and the crowns of the molars with cusps arranged in rows but eventually covered by a layer of enamel.
Gerbillus (or Tatera), with a large number of species, has a range coextensive with that of the sub-family; Pachyuromys, with two African species, has a short club-shaped tail and enormous auditory bullae; while the remaining members of the group, which are confined to North Africa, Eastern Europe and Asia, are arranged in the genera Meriones, Psainmomys and Rhombomys, the latter represented only by R.