. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. WATSON : BOLrOSAURUS AND REPTILE CLASSIFICATION 325 Vertebral Column Vertebrae occur in association with characteristic teeth of Bolo- saurits in 4320, 4326, 2088 and 2087. The last association is in a tight-packed mass of more or less articulated material where there is no real doubt that the verte- brae belong to the teeth: the bones are however crushed and cov- ered with a thin but irremovable film, and the vertebrae serve only to confirm the determination of two small strings of verte- brae
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. WATSON : BOLrOSAURUS AND REPTILE CLASSIFICATION 325 Vertebral Column Vertebrae occur in association with characteristic teeth of Bolo- saurits in 4320, 4326, 2088 and 2087. The last association is in a tight-packed mass of more or less articulated material where there is no real doubt that the verte- brae belong to the teeth: the bones are however crushed and cov- ered with a thin but irremovable film, and the vertebrae serve only to confirm the determination of two small strings of verte- brae in 2088. These, with two damaged intermediate vertebrae, make a total of 14 not including either axis or sacrals; their total length is approximately 95 mm. The number of presacral verte-. Fig. 5. Bolosaurus striatus Cope. 2088. x 2. Trunk vertebra. A, left lateral, B, posterior, C, anterior, D, dorsal aspect. brae in Lower Permian reptiles varies" from 27 in pelycosaurs to some 21 in cotylosaurs. Thus the series in Bolosaurus represents more than half the presacral region. An associated dentary is large, probably bigger than 4327 by 10 or 15 per cent: the skull length being circa 45 mm., -|- 15 per cent^ mm. Twenty-one vertebrae would be times skull length. This is of the order of proportion said by Romer to be common amongst primitive pelycosaurs and reptiles in general. The structure of an individual vertebra, based on the second of this series, is shewn in Figure 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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