760 
PROFESSOR OWEN ON THE MEGATHERIUM. 
Fig. 9. The last five dorsal and the lumbar vertebrae of the Helamys capensis. Side 
view. 
Fig 10. The ninth and tenth dorsal with the second and third lumbar vertebrae of 
the JLagotis Cuvieri. Side view. 
PLATE XLVII. 
Fig. 11. The last seven dorsal vertebrae of the Capybara {Hydrochoerus Capyhara), 
from the dorsal aspect, chiefly to demonstrate the distinction between the 
metapophyses (m) and the prozygapophyses (z). 
Fig. 12. The twelfth, fourteenth and fifteenth dorsal vertebrae, and the first and 
second lumbar vertebrae of the Wombat {Phascolomys Wombatus), from 
the dorsal aspect, to show the serial homology of the diapophysis {d), and 
the partially anchylosed rib {pi) of the first lumbar vertebra (l i). 
Fig. 13. The last four dorsal vertebrae, the lumbar vertebrae and sacrum of the 
Macropus Parryi, side view, showing the abrupt commencement of the 
metapophyses (m) on the twelfth dorsal, the comparatively small size of the 
anapophyses {a) ; and the distinctness and persistency of the diapophyses 
{d) in the posterior dorsal vertebrae. 
PLATE XLVIII. 
Fig. 14. The last eight dorsal vertebrae and first lumbar vertebra of the Musk-deer 
{Moschus moschiferus) , showing the progressive development and change of 
position of the metapophysis (m) ; the serial homology of the dorsal and 
lumbar diapophyses {d) ; and the anomalous development of the pleurapo- 
physis {pi') of the fourteenth vertebra from the neck. Side view. 
Fig. 15. The fourth, sixth, seventh, twelfth and fourteenth dorsal vertebrae of the 
Delphinus Tursio, from the dorsal aspect, showing the gradual supercession 
of the prozygapophyses (z), by the metapophyses {m). 
Fig. 16. The eleven anterior dorsal vertebrae of the Delphinus Delphis, showing the 
sudden beginning and progressive ascent of the metapophysis {m) in that 
part of the vertebral column ; also the progressive elongation of the diapo- 
physis {d). 
PLATE XLIX. 
Fig. 17 . The last two dorsal and first lumbar vertebrae of the Three-toed Sloth {Bra- 
dy pus tridactylus), from the dorsal aspect. 
Fig. 17 *. The last six cervical and first two dorsal vertebrae of the Echidna hystrix, 
showing the distinct short and thick pleurapophyses {pi’) of the neck, still 
articulating with the diapophysis {d) and parapophysis {p). 
The body of the atlas (c a) has not yet coalesced, as the ‘ odontoid process,’ 
with the dentata. 
