. Bulletin of the Natural Histort Museum. Geology series. 30 CHARIG AND MILNER. %*i.^' '4^. m Ml^^'^ ^BP '- "Tl -;â * . ,.« ^Hfe^t^^'fa 3 B Fig. 19 Baryonyx walkeri, holotype, BMNH R9951; scanning electron micrographs of tooth crown in Fig. 18C. A, denticles on the mesial carina and the granular texture of the enamel, x 30; B, higher magnification of four denticles from the centre of row in A. x 150. largest of those in the preserved portion (bearing only the first 7-8 alveoli) is no. 3, from which they diminish fairly regularly in both directions. In the dentary, by contrast,
. Bulletin of the Natural Histort Museum. Geology series. 30 CHARIG AND MILNER. %*i.^' '4^. m Ml^^'^ ^BP '- "Tl -;â * . ,.« ^Hfe^t^^'fa 3 B Fig. 19 Baryonyx walkeri, holotype, BMNH R9951; scanning electron micrographs of tooth crown in Fig. 18C. A, denticles on the mesial carina and the granular texture of the enamel, x 30; B, higher magnification of four denticles from the centre of row in A. x 150. largest of those in the preserved portion (bearing only the first 7-8 alveoli) is no. 3, from which they diminish fairly regularly in both directions. In the dentary, by contrast, the size of the alveoli is generally much more regular, nos 5-26 forming a straight series of almost uniform diameter; 1^, however, are appreciably larger, producing a slight swelling corresponding in position to the spatu- late tip of the upper jaw but much less marked; 27-32 diminish regularly. Vertebral column Cervical region (Figs 20, 21). Five cervical vertebrae are pre- served fairly complete, including the axis. Also preserved are the atlantal pleurocentrum (odontoid), the right atlantal neurapophysis, the axial intercentrum, and one cervical rib. The vertebrae were not found in articulation, so they are ordered according to the various morphological trends that they display. If it be assumed that the total cervical count was the usual theropod number, nine, then the verte- brae preserved, in addition to the axis (Ce2), are likely to be Ce3, Ce5, Ce6 and Ce8. Their most important dimensions, together with those of the dorsal vertebrae, are given in Table 1 below. Table 1 Dimensions of the cervical, dorsal and proximal caudal vertebrae (all measurements are in mm) B C H I M Ce2 (axis) Ce3 Ce5 Ce6 Ce8 Dl D2 D3 D4 D5 D6 D7 D8 DIO Dll D13 DI4 50 68 53 52 73 55e 45 70 65 81 126 90 101 - - - - 61 39 80 58idc 74 178 115 117 - - - - 67e 44e 84 65 95 179 111 110 - - - - 84e 62 95 66e 120 204 99 98 - _ - - 75e 80 90 80 91 tbd - 123 87 16 50 27 103 85 100 78 108 109 115 110 100
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