384 
PROFESSOR, OWEN ON THE MEGATHERIUM. 
that power depends there is no trace in the Megatherium any more than in the 
Mylodon. 
The hsemapophyses are distinct, but short and stumpy, in the first caudal vertebra 
of the Dasypus longicaitdatus, Pr. Max. : in the Myrmecophaga jubata they present 
proportions much more nearly resembling those in the first caudal vertebra of the 
Megatherium, and they are equally disjoined at their distal ends*. 
The Mylodon in the number, as well as the proportions and structure of the caudal 
vertebrae, makes the nearest approach to the Megatherium ; the haemapophyses are 
equally distinct from each other in the first caudal'i'. 
Upon the whole, our deductions from the characters of the parts of the skeleton 
described in the present section of this memoir, would lead to an inference that Me- 
gatherium was nearer akin to Myrmecoyhaga than to Bradypus ; nevertheless the cer- 
vical vertebi-ce, the condition of the anterior ribs, the form of the manubrium sterni, 
and the pelvis, illustrate the intermediate nature of the giant’s affinities, and afford 
an additional instance to many others which I have had occasion to point out, of a 
closer adherence to a common type in extinct animals than in the existing species to 
which they may be most nearly allied. 
Description of the Plates. 
PLATE XVII. 
Skeleton of the Megatherium, on the scale of one inch to a foot. (The vertebrae 
concealed by the scapula are added in 
C 1 - 7 - Cervical vertebrae. 
D 1 - 16 . Dorsal vertebrae. 
L 1 - 3 . Lumbar vertebrae. 
S. Sacrum. 
Cd 1 - 18 . Caudal vertebrae. 
.38. Stylohyal. 
51. Scapula. 
53. Humerus. 
54. Ulna. 
55. Radius. 
s. Scaphoid part I of Scaphotrape 
t. Trapezial part/ zium. 
1. Lunare. 
ne.) 
c. Cuneiforme. 
p. Pisiforme. 
d. Trapezoides. 
m. Magnum. 
u. LTnciforme. 
I. Rudimentary metacarpal of first digit 
or pollex. 
IT. Second digit, or index. 
III. Third digit, or niedius. 
IV. Fourth digit, or annularis. 
V. Fifth digit, or minimus. 
62 - Ilium. 
63. Ischium. 
* See Philosophical Transactions, 1851, Plate LIII. fig. 60. 
t Memoir on the Mylodon, 4to. p. 69, pi. 8, fig. 5, b, b. 
