. Annual report. 1st-12th, 1867-1878. Geology. 766 GEOLOGICAL SURVEY OF THE TERRITORIES. sooner do the fan-like lower ends commence to contract to merge into a shaft than dilatation immediately sets in again to form the great tuber- ous heads that constitute the opposite and superior extremities. More of a true shaft exists in Catharista than in any other of these Vultures, for the coracoids are proportionately longer in this species; in all it is more or less compressed from before, back- wards, rounded externally, sharper within, where in each boneit is pierced midway by an elliptical forame
. Annual report. 1st-12th, 1867-1878. Geology. 766 GEOLOGICAL SURVEY OF THE TERRITORIES. sooner do the fan-like lower ends commence to contract to merge into a shaft than dilatation immediately sets in again to form the great tuber- ous heads that constitute the opposite and superior extremities. More of a true shaft exists in Catharista than in any other of these Vultures, for the coracoids are proportionately longer in this species; in all it is more or less compressed from before, back- wards, rounded externally, sharper within, where in each boneit is pierced midway by an elliptical foramen, such as we found in iSpeotyto. This last feature is scarcely perceptible in the Carrion Crow. • In each the facet for the scapula is behind and rather to- wards the median plane; it is x>laced transversely upon the bone, occupy- ing the upper surface of the scapular process, and is continuous with the shallow glenoidal facet that is seen on the outer aspect. The coracoids terminate superiorly in rounded heads that are flattened from side to side, and present upon their mesial aspects smooth surfaces for the broad clavicular limbs. The blades of the scapulae, are short and broad, being curved outwards, with rounded points; they never reach back nearly so far as the pelvis, but generally overlap the last pair of dorsal ribs. The heads of these bones are flattened from above downwards, curled up on their inner aspects, so as to afford surface to articulate with the points of the clavicular ends, while ex- ternally they present raised elliptical facets that go to complete the glenoid cavities of each shoulder joint. The entire anterior margin of a scapula Eight coracoid of Pseudoqryphus, viewed from in IS devoted tO the articular facet for front-, life size. the coracoid. The glenoid cavity formed by the approximation of these two bones is quite deep and extensive, and thus far we have failed to discover the presence of the os humero scapulare, and its assistance is apparen
Size: 1068px × 2339px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, bookpublishe, booksubjectgeology
