. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London ... Reptiles, Fossil. 20 MAEINE EEPTILES OF THE OXFOED CLAY. rounded articular knob, the lower surface of which bears a rather deep cup-like depression {c[.f.), into which the upwardly projecting postero-external angle of the quadrate is received. As already mentioned, there seems to have been a certain amount of play between the two bones; and this probably indicates that the rostral portion of the skull was capable of some small degree of movement
. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London ... Reptiles, Fossil. 20 MAEINE EEPTILES OF THE OXFOED CLAY. rounded articular knob, the lower surface of which bears a rather deep cup-like depression {c[.f.), into which the upwardly projecting postero-external angle of the quadrate is received. As already mentioned, there seems to have been a certain amount of play between the two bones; and this probably indicates that the rostral portion of the skull was capable of some small degree of movement on the cranial, this movement being transmitted to the quadrato-jugal by the jugal bar. The external face of the bone is overlapped below by the posterior upturned end of the jugal, the surface for which is clearly deiined (see text-fig. 10, K,ji(.f.). Above, the bone bears a roughened facet [) by which it joined the postorbital, which also overlapped the upper end of the jugal. Text-fiij. 10, fiorbf. mxf. Eight quadrato-jugal and jugal of Oplitlialmosaurus: A, quadrato-jugal, outer side ; B, ditto, lower side, with articulation for quadrate ; C, ditto, inner side ; D, jugal, outer side. (E. 2180, about f nat. size.) ju., jugal; , facet for jugal; ?./., facet for posterior end of lachrymal; , facet for maxilla ; , facet for postorbital; , facet for quadrate. The jugal (text-fig. 10, D) is a long curved bone, consisting of a slender horizontal bar in front and a laterally-flattened, upturned blade behind. Tlie upper portion of the blade overlaps the outer face of the quadrato-jugal, and is in turn overlapped by the lower end of the postorbital (), so that it is thrust between these two bones. The anterior bar is oval in section in its posterior half, but anteriorly it becomes compressed from side to side, and is deeply grooved [l-f.) superiorly for union with the lower edge of the posterior prolongation of the lachrymal. On the inn
Size: 2287px × 1092px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectreptile, bookyear1910
