. Sur l'anatomie des vertébrés [ressource électronique] . bers. La partie extérieure rugueuse des formes de thepétrosal, comme elle l'était, la bordure d'une capsule à la tympanique: La fosse pour le stylohyal est bien marquée à la partie arrière de la frontière. Le ptérygoïde forme une grande plaque verticale quadratique. Le narium du septum de Thebony se termine à mi-chemin du grand narine externe verticalvaire. Il y a un petit lacrymal imperméable: Le trou ant-orbital est le désir. Dans l'Unau {Bradypus didactylus), le lacrymal est percé à l'extérieur de l'orbite. Dans le Megathy theforamen est à la marge orbitale, et il y a un grand fourmis

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. On the anatomy of vertebrates [electronic resource] . bers. The rough exterior part of thepetrosal forms, as it were, the border of a capsule to the tympanic:the fossa for the stylohyal is well marked at the back part of theborder. The pterygoid forms a large quadrate vertical plate. Thebony septum narium terminates half-way from the large verticalexternal nostril. There is a small imperforate lacrymal: the ant-orbital hole is wanting. In the Unau {Bradypus didactylus) thelacrymal is pierced external to the orbit. In the Megathere theforamen is at the orbital margin, and there is a large antorbitalforamen: the premaxillaries, though edentulous, are more producedthan in existing Sloths, and there is a corresponding productionof the symphysial part of the lower jaw, which is grooved above, as in the Anteaters, for the support during its pro- and re-tractilemovements of a long tongue, prehensile in the Megathere as inthe Giraffe, in reference to the smaller branches of the treesyielding food to the extinct giant. Behind the symphysis the 274. Skull of Megatherium, one-fifteenth nat. size. SKELETON OF BRUTA. 407 mandible is deepened for the long roots and matrices of the ever-oTowinof molars. The extension of the air-sinuses, great in theclimbing Sloths, was still more so in the colossal species, whosestrength enabled them to uproot and prostrate the trees theybrowsed on. The skull of the Mylodon robustus in the Hun-terian Museum shows two extensive fractures of the outer table, one wholly, the other partially, healed: the latter extending tonear the occiput, but having broken only into the air-chamber, not into the cranial cavity, the inner, proper or f vitreous table ofwhich is everywhere divided by sinuses and sinuous bony platesfrom the outer table. Notwithstanding the extreme diversity—singular contrast in-deed in several particulars—which the skull presents in the orderBruta, the marks of inferiority of position in the Mammalianseries, according to the cerebral

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