. On the Fossil Mammals of Australia. Part III. Diprotodon australis, Owen . from that surfaceto a thickness of 1^ inch. The free border,of this thickness, is also flat; the spine gra-dually rising as it advances, describes aslight curve toward the upper or anteriorcosta (^); the lower margin of the free borderbecomes most produced, and, as the spineexpands into the acromion (^), this marginalso expands and becomes rough for muscularattachments, and in the present specimenforms the most prominent part of the acro-mion ; but the end of this process is brokenoff. From a pencil-sketch of this sca
. On the Fossil Mammals of Australia. Part III. Diprotodon australis, Owen . from that surfaceto a thickness of 1^ inch. The free border,of this thickness, is also flat; the spine gra-dually rising as it advances, describes aslight curve toward the upper or anteriorcosta (^); the lower margin of the free borderbecomes most produced, and, as the spineexpands into the acromion (^), this marginalso expands and becomes rough for muscularattachments, and in the present specimenforms the most prominent part of the acro-mion ; but the end of this process is brokenoff. From a pencil-sketch of this scapulamade by Sir Thomas Mitchell when itarrived at Sydney (Woodcut, fig. 6), the acro-mion {e) continued to expand to an obliquelytruncate end, having the upper or fore angle most produced, and, as it were, slightlytwisted towards the coracoid {c) (indicated by the dotted line in fig. 1, Plate XLV.). Asthe spine (ib. /*) rises from the scapular plate, it becomes compressed or thinner beneaththe free margin, and presents a smooth concave surface to each scapular fossa {i^j^. Scapula of Diprotodon: one-fifth nat. size. 550 PEOFESSOR OWEN ON THE EOSSIL MAMMALS OE AUSTRALIA. The coracoid process (Plate XLY., c), arising from a base of 3 inches in extent, is sub-compressed, with the outer surface concave as it extends toward the end of the process,which, however, is broken off. The upper or front costa (ib. g) describes a strong con-cave curve as it recedes from the coracoid; the middle third of its extent (ib.^% whichwas probably convex and produced, has been broken away. Where it is again entire(ib. ^) it describes a gentle concavity, and forms the outer border of a sudden thickeningof that part of the basal end of the scapula. The upper or basal three-fourths of thisanterior border of the bladebone are curved dorsad, so as to bound or form the (trans-verse) hollow of the supraspinal fossa (ib. fig. 1, ^). The part broken from the uppercosta (g) may have made the breadth of the fos
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Keywords: ., bookcentury1800, bookdecade1870, bookidphiltrans096, bookyear1870
