Archive image from page 80 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 .. descriptivecatal02brit Year: 1910 PELONEUSTES. 51 widens out and projects forwards over the body of the atlas, bearing on its upper face the zygapophysial facets, with which the hinder ends of the two halves of the arch of the atlas articulate. From these surfaces a ridge runs upwards and backwards, and forms the outer edge of the posterior zygapophyses which project considerably behind
Archive image from page 80 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 .. descriptivecatal02brit Year: 1910 PELONEUSTES. 51 widens out and projects forwards over the body of the atlas, bearing on its upper face the zygapophysial facets, with which the hinder ends of the two halves of the arch of the atlas articulate. From these surfaces a ridge runs upwards and backwards, and forms the outer edge of the posterior zygapophyses which project considerably behind the posterior surface of the centrum. The neural spine () is low and stout, it slopes backwards, its anterior edge being convex, the posterior slightly concave; the upper end is considerably thickened. In the succeeding cervicals (text-fig. 17) the neural arch is similar, uniting with the whole length of the centrum and, in some cases, even forming a small portion of the upper edge of the articular surface. Both anterior and Middle cervical vertebra of PeloneustespMlarchus, from left side. (R. 3313, § nat. size.) , anterior zygapophysis ; , neural spine ; , posterior zygapophysis ; )•./., facets for ribs. posterior zygapophyses are large, and their articular surfaces are flat and oval in outline; the anterior pair are directed somewhat upwards, the posterior downwards, and in each case they project considerably beyond the centrum. The base of the neural spine () extends the whole length of the arch. The lower part of the anterior edge is sharp, but towards the top it thickens and becomes roughened; at the same time the width of the spine decreases. In the third vertebra, the spine () is short and it 2
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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
