Archive image from page 108 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 MDRiENOSAUEUS. 79 laterally the body of the bone bears a pair of stout processes which project outwards and downwards, their ends being truncated by large oval facets {) which look outwards and forwards and articulate with the pterygoids, which in these animals extend very far back, their posterior ends, by which they unite Avith the quadrates, be
Archive image from page 108 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 MDRiENOSAUEUS. 79 laterally the body of the bone bears a pair of stout processes which project outwards and downwards, their ends being truncated by large oval facets {) which look outwards and forwards and articulate with the pterygoids, which in these animals extend very far back, their posterior ends, by which they unite Avith the quadrates, beiiicr actually behind the occipital condyle. Between these processes the ventral surface of the bone is concave from side to side; in front of this it is flattened and greatly roughened up to its anterior edge. In some cases the posterior surface of the lateral processes bears a roughened surface for the attachment of muscles. Text-fig. 43. Basioccipital of Mmxenosaurus durobrivensis: A, from below ; B, from above ; C, from front. (E. 2361, nat. size.) , facet for basisphenoiJ ; , facet for exoecipita); , floor of Deural canal; , occipi'-al cond'yle; p'-/-i facet for pterygoid. The lasisjj/ienoid (, PI. III. figs. 1,1 a; text-fig. 44) consists of a posterior cuboid mass of bone, the antero-ventral portion of which is prolonged forwards to form the floor of the pituitary fossa. The posterior face is nearly flat and fitted closely against the corresponding surface of the basioccipital. In most cases the two bones can be seen to make a very obtuse angle wnth one another, the axis of the basis cranii in front of the basioccipital being bent a little upwards. The nearly flat upper surface consists of two flattened areas united in front, but separated posteriorly by a V-shaped concavity ; in life these areas were perhaps covered wiih
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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
