. 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. 168 MAEINE EEPTILES OE THE OXPOED CLAT. vertebra the spine is still thickened, but is nearly vertical: it terminates above in a convex facet, which does not occupy the whole length of its upper end ; in this vertebra also the zygapophyses are much reduced. The next vertebra (the first of those in the deflected portion of the tail) has a much higher neural spine, which is directed forwards; in the next the spine is likewise larg
. 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. 168 MAEINE EEPTILES OE THE OXPOED CLAT. vertebra the spine is still thickened, but is nearly vertical: it terminates above in a convex facet, which does not occupy the whole length of its upper end ; in this vertebra also the zygapophyses are much reduced. The next vertebra (the first of those in the deflected portion of the tail) has a much higher neural spine, which is directed forwards; in the next the spine is likewise large, much thickened at its upper end, and directed forwards. The anterior zygapophyses are well developed and articulate with the small posterior zygapophyses on the posterior face of the arch in front. Behind this point the neural spines become smaller and smaller, but are still directed forwards. A little in front of the flexure of the tail the centra become strongly compressed from side to side, and at the flexure itself they are considerably longer dorsally than ventrally, Test-tig. 67. I±Z. Eibs of MetrlorhyncTius svperciliosum: A, right rib of axis ; B, right rib of atlas ; C, middle right cervical rib ; D & E, anterior dorsal ribs ; E, middle dorsal rib. (E. 1530, if uat. size.) d., diapophysial process (tubercle); p., parapophvsial process (bead). the flexure being, in fact, produced by the apposition of the centra of this form. Behind the flexure there seem to have been about thirteen vertebra?, the centra of which are all strongly compressed laterally. Bibs (text fig. 67).—The rib of the atlas (text-fig. 67, B) is a simple bar of bone which widens a little in its posterior third and then narrows posteriorly to a blunt point. At its anterior end it bears a flat, or slightly convex, facet for union with the corresponding surface on the posterior border of the anterior subvertebral wedge-bone ;. Please note that these images are extracted from scanned page images th
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreptile, bookyear1910
