Archive image from page 103 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 74 MAEINE EEPTILES OF THE OXEOED CLAY. in proportion to their width than in the other species ; the chevron-facets on the caudals are large. A number of peculiarly shaped bones (text-fig. 29), preserved with this skeleton, are here regarded as sacral or anterior caudal ribs. At their proximal end they bear a head (/.) with two facets for union with the
Archive image from page 103 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 74 MAEINE EEPTILES OF THE OXEOED CLAY. in proportion to their width than in the other species ; the chevron-facets on the caudals are large. A number of peculiarly shaped bones (text-fig. 29), preserved with this skeleton, are here regarded as sacral or anterior caudal ribs. At their proximal end they bear a head (/.) with two facets for union with the lower part of the neural arch and with the centrum ; distally they expand into a broad blade, which curves somewhat downwards and is strengthened on the ventral surface by a ridge (r.) running out from the head. They vary in form at their outer ends : in some there is a large terminal facet, perhaps for union with the ilium ; in most the outer end is produced forwards and backwards into a short process terminating in a flat facet (/.), which probably united with the corresponding facet on the rib before and behind. This arrangement would add greatly to the rigidity of the sacral and anterior caudal regions, a condition probably connected with the great development of the hind paddles. Text-fig. 29. Sacral ribs (?) of Pdoneustcs evansi: A, B, from above ; C, from below. (E. 3891, | nat. size.) /., facet for contact with next rib ; 7i., articular head ; ?•., strengthening ridge. Of the pelvis only the ilia are preserved. These expand dorsally into a broad triangular blade much as in Pliosauras, and, as will be seen from text-fig. 25, B, in Peloneustes philarchus also. The upper border is greatly roughened and bears a surface probably for union with the outer end of one or more of the expanded ribs noticed above. The upper part of the outer face of the posterior border has a strongly developed rugosity for muscle-attachment. The fore and hind paddles are much the same as in
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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
