Archive image from page 137 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 .. descriptivecatal01brit Year: 1910 lOS MAEINE EEPTILES OF THE OXEORD CLaY. of the anterior part of the shoulder-girdle is mainly effected by the great increase in size of the ventral bars of the scapulae, which, in the adult, meet in median symphysis and also send back processes which meet the median anterior prolongations of the coracoids. The consequence of this extension of the scapu
Archive image from page 137 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 .. descriptivecatal01brit Year: 1910 lOS MAEINE EEPTILES OF THE OXEORD CLaY. of the anterior part of the shoulder-girdle is mainly effected by the great increase in size of the ventral bars of the scapulae, which, in the adult, meet in median symphysis and also send back processes which meet the median anterior prolongations of the coracoids. The consequence of this extension of the scapulae inwards to the middle line is, that the clavicular arch comes to lie on the visceral surface of tViose bones and becomes functionless, at least in the adult animal, and undergoes reduction. This may take place in several ways, and there is great variability in the degree to which it is carried, practically all stages from the presence of a well-developed clavicle and Text-fiK. 61. Shoulder-girdle of: A, Plesiosaurus '? rostrafus (E. 1315, about | nat. size), from below ; B, NotJiosauiics sp., from above. (About | nat. size.) cl., clavicle ; cor., coracoid ; , interclavicle ; se., scapula ; , veutral ramus of scapula. interclavicle to the almost complete absence of either or both these elements. Some of the various forms are shown in the text-figures of the shoulder-girdle in the different genera. In Murcenosaurus (PI. YI. fig. 3; text-figs. 62, 67, 68) the clavicles in most cases undergo great reduction and may become mere paper-thin plates of bone adherent to the inner face of the interclavicle (PI. VI. fig. 3) and of the ventral ramus of the scapula. The interclavicle (PL VI. fig. 6) is usually a well-developed, more or less oval disc of bone, thin at the margin, but thickening towards the middle; its anterior border bears in the middle line a rounded notch with somewhat thickened edges,
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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
