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.
The family, Chinchillidae, typified by the wellknown chinchilla, includes a small number of South American rodents with large ears and proportionately great auditory bullae in the skull, elongated hind-limbs, bushy tails, very soft fur and perfect clavicles.
As is always the case with large-eared animals, the tympanic bullae of the skull are of unusually large size; the size varying in the different genera according to that of the ears.
The skull has a remarkably narrow and pointed muzzle and much inflated auditory bullae; while the two halves of the lower jaw are firmly welded together at their junction, thus effectually preventing the scissor-like action of the lower incisors distinctive of Macropus and its immediate allies.
In the members of the typical genus Potorous (formerly known as Hypsiprymnus) the head is long and slender, with the auditory bullae somewhat swollen; while the ridges on the first two premolars are few and perpendicular, and there are large vacuities on the palate.
The South Australian Caloprymnus campestris represents a genus near akin to the last, but with the edge of the hairy border of the bare muzzle less emarginate in the middle line, still more swollen auditory bullae, very large and posterially expanded nasals and longer vacuities on the palate.
The list is completed by Aepyprymnus rufescens, which differs from all the others by the hairy muzzle, and the absence of inflation in the auditory bullae and of vacuities in the palate.
The sovereigns of Spain, too, made use of the same material; and in the Byzantine empire leaden bullae seem to have been universally employed, not only by emperors and state officials but also by private persons.
Even in the north, metal bullae were also occasionally in use.
On special occasions golden bullae were issued by the Byzantine emperors, by the popes, FIG.
The popes attached golden bullae to their confirmations of the elections of the emperors in the 12th and 13th centuries; and they issued them on such occasions as when Leo X.
The title of Defender of the Faith, in 1521; on the coronation of Charles V., 1530; on the erection of the archbishopric of Lisbon into a patriarchate in 1716, &c.; and quite recently papal golden bullae have been conferred on royal personages.
Comparatively few examples of golden bullae have survived.
Von Pflugk-Hartung, Specimina selecta chartarum pontificum Romanorum (for papal bullae) (1885-1887); Catalogue of Engraved Gems in the Dept.