. An introduction to the study of mammals living and extinct. Mammals. MEGA 183 unlike the true canines of heterodont mammals. Vertebrae : C 6 or 7, D23-2-i, L 3, S 7-8, C 4-6. One species (C. didadylus) has the ordinary number of vertebra? in the neck; but an otherwise closely allied form [G. hoffmanni) has but six. The tail is very rudimentary. The hand generally resembles that of Bradypiis ; but there are only two functional digits with claws—those answering to the second and third of the typical pentadactylate manus. The structure of the hind limb generally resembles that of Brad
. An introduction to the study of mammals living and extinct. Mammals. MEGA 183 unlike the true canines of heterodont mammals. Vertebrae : C 6 or 7, D23-2-i, L 3, S 7-8, C 4-6. One species (C. didadylus) has the ordinary number of vertebra? in the neck; but an otherwise closely allied form [G. hoffmanni) has but six. The tail is very rudimentary. The hand generally resembles that of Bradypiis ; but there are only two functional digits with claws—those answering to the second and third of the typical pentadactylate manus. The structure of the hind limb generally resembles that of Bradypus, the appellation "two-toed" referring only to the anterior limb, for in the foot the three middle toes are functionally developed and of nearly equal size. G. didadylus,^Y\dch. has been longest known, is com- monly called by the native name of Unaii. It in- habits the forests of Brazil. G. hoff- manni (Fig. 58) has a more north- ern geographical range, extendine. -Skull of Two-toed Sloth (Cholcepiis didactyhis). From Froc. Zool. Soc. 1871, p. 432. from Ecuador through Panama to Costa Rica. Its voice, which is seldom heard, is like the bleat of a sheep, and if the animal is seized it snorts violently. Both species are very variable in external coloration. Nothropus}—The only fossil form which has been referred to this family is indicated by a lower jaw, described by Dr. Burmeister, from the Pleistocene of Argentina, which appears to have belonged to an animal of about double the dimensions of Chnlapus didadylus. Professor Cope states, however, that this jaw really belongs to a Glyptodont; while it is referred by Dr. Ameghino to the next familJ^ Family The members of this family are all extinct. Their characters, so fai' as is known from the well-preserved remains of manj' species found abundantly in deposits of Pleistocene age in both North and South America, were intermediate between those of the existing Bradypodiihr and the MyrmecopluKjidce,
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