. 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. 32 MAEINE EEPTILES OF THE OXFOED CLAT. below and parallel with the alveolar border is marked by a deep groove, into which several foramina open; anteriorly this groove is replaced by a number of irregularly placed foramina. On the inner side the dentaries of opposite sides unite in the middle line for a little more than the anterior half of the total length of the symphysis, being separated in the posterior portion by the splen
. 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. 32 MAEINE EEPTILES OF THE OXFOED CLAT. below and parallel with the alveolar border is marked by a deep groove, into which several foramina open; anteriorly this groove is replaced by a number of irregularly placed foramina. On the inner side the dentaries of opposite sides unite in the middle line for a little more than the anterior half of the total length of the symphysis, being separated in the posterior portion by the splenials. In their symphysial region the dentaries unite by their flattened upper and lower borders, between which they are concave from above downwards. The surface covered by the splenial seems to have been nearly flat, and posteriorly, as already mentioned, the thin posterior extension of the bone is wedged in between the coronoid and surangular. The upper surface of the dentary bears the broad and not very deep alveolar groove, in which the presence. Posterior portion of left ramus of mandible of Oplithahnosaurus: A, inner side; B, outer side. (E. 2180, I nat. size.) niif/., angular bone; art., articular bone; «)•<.«., articular surface on surangular ; e., c'., coronoid-like processes on surangular; cor., coronoid bone ; , backward extension of coronoid bone beneath the articular ; dent., dentary bone ; g., gi-oove on outer face of surangular ; , lower process at anterior end of the splenial bone; , surangular bone; sjil., splenial bone; i., tuberosity on upper border of sur- angular ; }., upper process at anterior end of the splenial bone. of teeth is indicated by a number of transverse ridges, strongly marked in front but becoming less distinct further back. The outer border of the groove is comparatively broad and rounded, the inner thinner and sharper—particularly posteriorly, where it is reinforced by the upper border of the splenial, and by whi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreptile, bookyear1910
