Archive image from page 135 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 106 MAEINE EEPTILES OF THE OXFOED CLAY. the posterior portion of the tail are curved backwards, their outer ends being occupied by a nearly flat facet. In both the cervical and caudal regions the ribs may fuse with the centra or remain separate. Their freedom or fusion is not of any systematic significance, except so far as it may indicate that in some
Archive image from page 135 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 106 MAEINE EEPTILES OF THE OXFOED CLAY. the posterior portion of the tail are curved backwards, their outer ends being occupied by a nearly flat facet. In both the cervical and caudal regions the ribs may fuse with the centra or remain separate. Their freedom or fusion is not of any systematic significance, except so far as it may indicate that in some forms the adult condition is attained while the animal is small, while in others the fusion does not take place till it has reached a large size. The same remarks hold good with regard to the fusion or separation of the neural arches throughout the column. The arrangement of the ventral ribs (text-fig. 60, A, B) is not well known in this genus: probably they were placed much as in Cri/ptocleidus (see below, p. 175)—at least the individual elements are closely similar to those found in that genus, in which Tentral and dorsal ribs of Murcenosaurus durohrivensis : A, median ventral rib ; B, posterior median ventral rib ; C, dorsal rib from behind; D, articular end of dorsal rib. (E. 2S63, nat. size.) , surface for union with lateral ventral rib. each of the transverse rows (with the possible exception of one or two posteriorly) consists of a median and three pairs of lateral bones. The median bone (text-fig. 60, A, B) is overiapped at either end by the inner ends of the first lateral pair, which are closely applied to its anterior face : these again are overlapped in a similar way by the second pair, and these again by the inner ends of the outer pair (see figure of plastron of Ciyptocleidus, text-fig. 86, p. 175). Shoulder-girdle (PL VI. figs. 3, 6 ; text-figs. 61, 62, 67, 68).—Before describing the structure of the shoulder-gii-dle in Muramosaurm it may be well to g
Size: 1561px × 1281px
Photo credit: © Actep Burstov / Alamy / Afripics
License: Licensed
Model Released: No
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
