. On the Fossil Mammals of Australia. Part III. Diprotodon australis, Owen . e been shorter than in the fourth vertebra*.The centrum and neural canal have increased, chiefiytransversely; there is very little increase of parapophysis has gained in vertical extent. In the series of mutilated vertebrae belonging toMr. Boyds specimen of Biprotodon are two dorsals(Plate XLIV. figs. 5-8). They show the impres-sions for the free articulation of the ribs both before g,,,^^ ^, ^^^^ ^^^^^^^ (^^ J^^^^ ^^^^^^^^and behind (ib. figs. Q&cl^pl^pl\ and are remarkable nat size; Biprotodon, for the re
. On the Fossil Mammals of Australia. Part III. Diprotodon australis, Owen . e been shorter than in the fourth vertebra*.The centrum and neural canal have increased, chiefiytransversely; there is very little increase of parapophysis has gained in vertical extent. In the series of mutilated vertebrae belonging toMr. Boyds specimen of Biprotodon are two dorsals(Plate XLIV. figs. 5-8). They show the impres-sions for the free articulation of the ribs both before g,,,^^ ^, ^^^^ ^^^^^^^ (^^ J^^^^ ^^^^^^^^and behind (ib. figs. Q&cl^pl^pl\ and are remarkable nat size; Biprotodon, for the retention of the short proportion of the cervicals, and for the terminal bifur-cation of the antero-posteriorly compressed spine (ib. figs. 5 & 8, ns). They are not con-secutive vertebrae, but were not far from one another in the anterior part of the dorsalseries. * It is so in the sketch sent me by Sir Thomas Mitchell from Sydney (Cut, ^g, 5); but, amongst thedamages to the specimens in their passage to London, the summit of this spine has been knocked off. Fig. PEOFESSOE OWEN ON THE EOSSIL MAMMALS OF AFSTEALIA. 543 As in this region the vertebrae in many Mammals decrease in breadth before regainingthe size which then goes on augmenting to the lumbar region, I first take for descriptionthat (Plate XLIV. figs. 5 & 6) which with a broader centrum has a shorter as well asbroader spine. The fore-and-aft extent of the centrum is 2 inches at its lower part; itslightly decreases towards its upper surface. The breadth of the centrum is 4 inches 10lines, above which this dimension is increased by the share contributed by the neurapo-physes (ib. fig. 5, n, n) to the body of the vertebra {c); the sutural lines indicative of thisshare are plainly traceable on the terminal articular surface (ib. fig. 5, <?), from which theepiphysial plate has become detached. As the ends of both diapophyses and neural spinesare broken off, the following dimensions of the vertebra are not the full ones
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