. 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. MUEiENOSAUEIIS. 10^ ventral face by rounded ridges, the posterior ends of which in the anterior caudals, and both the anterior and posterior ends in the middle and the posterior caudals, are trun- cated by oblique facets {) for union with the chevrons ; when both anterior and posterior facets are present, the latter are usually the larger (text-figs. 57—59, ). At the posterior end of the caudal region (text-fig. 58) the
. 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. MUEiENOSAUEIIS. 10^ ventral face by rounded ridges, the posterior ends of which in the anterior caudals, and both the anterior and posterior ends in the middle and the posterior caudals, are trun- cated by oblique facets {) for union with the chevrons ; when both anterior and posterior facets are present, the latter are usually the larger (text-figs. 57—59, ). At the posterior end of the caudal region (text-fig. 58) the centra become reduced in size very rapidly ; the actual terminal vertebrae are not known in this genus. In the anterior part of the caudal region the neural arches are not well known, but it appears that they possessed well-developed zygapophyses and comparatively high laterally com- pressed neural spines. Further back beyond the middle of the tail (text-figs. 58, 59) the Text-fig. Posterior caudal vertebrae o£ Murcen^isaur'as platydis : A, from below ; B, from front; C, from right side. (E. 2425, f nat. size.) , facets for chevrons; , caudal ribs ; , neural arch. arch becomes smaller and stouter, bearing a short thick neural spine («.s., ) ter- minating above in a surface for cartilage; in this region the zygapophyses have disappeared, or are represented only by slight rugosities. Further back still the arch is more massive and encloses a very small neural canal. The spine is very short and thick, and is almost rectangular in section ; it slopes a little backwards and terminates above in a large, slightly concave surface for a cap of cartilage. There is no trace of. 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreptile, bookyear1910
