Archive image from page 200 of A descriptive catalogue of the. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London .. descriptivecatal02brit Year: 1910 METRI0EHYNCI1US. 171 small paddle-like structure much as in Geosaurus. The shoulder-girdle is formed by the scapula and coracoid only. The scapula (sc.) is a slender flattened bone, widening out a little at its upper end, which terminates in a smooth convex surface. At the lower end the expansion is greater and the posterior side much thickened, the th
Archive image from page 200 of A descriptive catalogue of the. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London .. descriptivecatal02brit Year: 1910 METRI0EHYNCI1US. 171 small paddle-like structure much as in Geosaurus. The shoulder-girdle is formed by the scapula and coracoid only. The scapula (sc.) is a slender flattened bone, widening out a little at its upper end, which terminates in a smooth convex surface. At the lower end the expansion is greater and the posterior side much thickened, the thickened portion bearing two surfaces. Of these, one is roughened and triangular in outline for union with the coracoid ; this extends nearly the whole width of the end of the bone. The other facet is smooth and looks outwards, downwards, and backwards, forming the upper part of the glenoid cavity for the humerus. In front of the surface for the coracoid, the bone is produced into a blunt angle. Text-fig. 69. Shoulder-girdle and humerus of Metriorhynchus : A, right half of shoulder-girdle of If. superciliosum (R. 2051, | nat. size) ; B, right half of shoulder-girdle with the humerus of M. lave (~R. 3014, | nat. size). c,r., coracoid ; , deltoid crest; /., coracoid foramen ; , glenoid fossa ; h., head of humerus ; n., notch on coracoid ; sc, scapula. The coracoid (cor.) is considerably larger than the scapula; it is a strongly com- pressed bone, expanding to a fan-like shape at each end. The upper end is thickened posteriorly, the thickened portion bearing on its upper edge the surface for union with the scapula, while, looking backwards, there is a large oval, slightly concave surface which forms the lower two-thirds of the glenoid cavity. In front of this the bone is perforated by a large coracoid foramen (text-fig. 69, A), which, however, in some cases may become a deep notch (text-fig. 69, B). Sometimes this is the result of the breaking away of the border of the
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Keywords: 1900, 1910, andrews_charles_william_1866_1924, archive, book, bookauthor, bookcentury, bookdecade, bookpublisher, booksubject, bookyear, british_museum_natural_history_dept_of_geology, drawing, historical, history, illustration, image, london_printed_by_order_of_the_trustees, page, picture, print, reference, reptiles_fossil, vintage
