. An introduction to the study of mammals living and extinct. Mammals. MACROPODIDJE 163 jaws always having large, simple, compressed crowns, with a nearly straight or slightly concave free cutting edge, both outer and inner surfaces usually marked by a series of parallel, vertical grooves and ridges, these teeth being either set in the same line with the molars, or slightly bent outwards. Molars with cjuadrate crowns, having a blunt, conical cusp at each corner, the fourth notably smaller than the third, sometimes rudimentary, and appearing early. Fore feet narrow; three middle toes considerab
. An introduction to the study of mammals living and extinct. Mammals. MACROPODIDJE 163 jaws always having large, simple, compressed crowns, with a nearly straight or slightly concave free cutting edge, both outer and inner surfaces usually marked by a series of parallel, vertical grooves and ridges, these teeth being either set in the same line with the molars, or slightly bent outwards. Molars with cjuadrate crowns, having a blunt, conical cusp at each corner, the fourth notably smaller than the third, sometimes rudimentary, and appearing early. Fore feet narrow; three middle toes considerably exceeding the first and fifth in length; their claws long, compressed, and but slightly curved. Hind feet as in Macropus. Tail long and hairy, sometimes partially prehensile, being used for carrying bundles of grass with which these animals build their nests. The Potoroos or Eat Kangaroos are all small animals, none of them exceeding a common rabbit in size. They inhabit Australia and Tasmania, are nocturnal, and feed on the leaves of various. Fig. 54.—Skull and Teeth of Eat Kangaroo (Bettongia Icsuadri). c, Upper canine. The other letters as in Fig. 51. kinds of grasses and other plants, as well as roots and bulbs, which they dig up with their fore paws. Nine species are known, present- ing a considerable range of diversity in minor characters, and admitting of being grouped in four principal sections, which may be allowed the rank of genera. These are : Potorous}—Head long and slender. Auditory bulte some- what inflated. Ridges on premolars few and perpendicular. Large palatine foramina. Tarsus short. Mufile naked. Three species, viz. P. tridadylus, P. gilberii, and P. platyops; the last two being confined to West Australia. Bettongia.'''—Head comparatively short and broad. Ears short and rounded. Auditory bullse generally much inflated. Large palatine foramina. Tarsus long. Ridges on premolars numerous ' Desmarest, Kouv. Diet. cl'Hist. Nat. ser. 1, vol. xxiv. Talle
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