. 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. 52 MAEINE EEPTILES OF THE OXEOED CLAY. curves sharply back, iu the fourth and fifth there is an increase in length and they also curve backwards. Behind these to about the tenth (text-fig. 18) there is a gradual increase in height, the spines being nearly straight and sloping a little backwards. Behind this, again, the height of the spine remains about the same to the eighteenth, then in the posterior two or three members of th
. 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. 52 MAEINE EEPTILES OF THE OXEOED CLAY. curves sharply back, iu the fourth and fifth there is an increase in length and they also curve backwards. Behind these to about the tenth (text-fig. 18) there is a gradual increase in height, the spines being nearly straight and sloping a little backwards. Behind this, again, the height of the spine remains about the same to the eighteenth, then in the posterior two or three members of the series (text-fig. 19) there is a decrease in height and increase of width, passing into the form found in the dorsal region. In addition to the two or three vertebra? in which the rib-articulation is partly on the arch and partly on the centrum (pectorals), there are about twenty dorsals. The Text-fig. Posterior cervical vertebras of Peloneustes joJiilarclius, from left side. (B. 3318, if nat. size.) cue., anterior zygapophysis ; «.«., neural spine ; , posterior zygapophysis ; , facets for ribs. centra of these are longer than in the cervicals, and their lateral and ventral faces are deeply concave from before backwards. The articular faces are higher than in the cervicals, the height in some cases exceeding the width; the surface is very slightly concave and there is a central pit which, in some cases, is situated at the summit of a slight elevation. The neural arches are not well preserved in any specimen. The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). Dept. of Geology; Andrews, Charles William, 1866-1924. London, Printed by order of the Trustees
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreptile, bookyear1910
