. 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. Xll MARINE REPTILES OF THE OXFORD CLAY. and there is a space large enough for one centrum, probahly the last cervical. The next vertebra has the parapophysis almost entirely on the arch and is here regarded as the first dorsal—if rightly so, there are nineteen dorsals altogether. In all, the transverse processes are broken away, but the neural spines, which are broad, low, and sloping a little backwards, are well preserved. 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. Xll MARINE REPTILES OF THE OXFORD CLAY. and there is a space large enough for one centrum, probahly the last cervical. The next vertebra has the parapophysis almost entirely on the arch and is here regarded as the first dorsal—if rightly so, there are nineteen dorsals altogether. In all, the transverse processes are broken away, but the neural spines, which are broad, low, and sloping a little backwards, are well preserved. The two sacrals are much obscured by the crushing that has taken place, the right ilium having apparently been forced down upon them and destroyed ; the neural spines are similar to those of the dorsal region. The caudal vertebrae (text-fig. A) are about fifty in number, and of these twenty-seven are in front of the downward flexure of the tail. E. Fraas states that in Text-fig. A. Ik. Terminal portion of tail of Geosaurus gracilis, showing the outline of the fin. (R. 3948, | nat. size.) Geosaurus suevicus there are forty-four caudals, but possibly some of the very small terminal centra, here preserved, may be wanting in his specimen. Caudal ribs seem to have been present on the first fourteen vertebrae, but on the last two of these they merely form slight prominences. The neural spines are not well preserved in the first few caudals, but further back it can be seen that they are composed of a larger back- wardly sloping portion separated by a notch from a small anterior pointed process (the " Vorreiter " of Fraas). From the sixteenth to the twenty-fifth the neural spines are not well preserved, but on the twenty-sixth and twenty-seventh (the two immediately anterior to the downward bend) they are seen to slope sharply backwards and are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorati
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreptile, bookyear1910
