. Carnegie Institution of Washington publication. 88 A REVISION OF THE COTYLOSAURIA OF NORTH AMERICA but all are badly worn and the fifth has apparently lost the apex since the original description. The tooth figured by Cope (43) is the last of the series and is of little diagnostic value, as the posterior teeth in all members of the family are of similar form. Desmatodon hollandi Case. (Plate 8, figs. 2 and 3.) Characteristic specimen: The type, No. 1938 Museum of Carnegie Institute. Aside from the teeth described as typical of this genus, there are several chevron bones belonging to an anima
. Carnegie Institution of Washington publication. 88 A REVISION OF THE COTYLOSAURIA OF NORTH AMERICA but all are badly worn and the fifth has apparently lost the apex since the original description. The tooth figured by Cope (43) is the last of the series and is of little diagnostic value, as the posterior teeth in all members of the family are of similar form. Desmatodon hollandi Case. (Plate 8, figs. 2 and 3.) Characteristic specimen: The type, No. 1938 Museum of Carnegie Institute. Aside from the teeth described as typical of this genus, there are several chevron bones belonging to an animal of larger size. Whether these belong to the genus Desmatodon is uncertain; they may indicate an animal more closely related to Diadectes, as they have the form and size of the chevrons of Diadectes phaseohnus. The largest one has a length of 51 Fig. 33. A. Lateral view of skull of Bolbodon tenuiietius. x J. No. 4375 Am. Mus. n, nasal; /, lachrymal; , maxillary; pmx, premaxillary; pf, prefrontal. B. Lateral view of skull of Bolosaurus striatum. X* No. 4686 Am. Mus. fm, foramen magnum; j, jugal. C Lower view of skull of Bolosaurus siriatus. X*. No. 4685 Am. Mus. pi, palatine; pt, pterygoid; bs, basisphenoid; bo, basioccipital. The form of the teeth is intermediate between those of Bolbodon and Diadectes, as is shown in the accompanying figure (fig. 34). The various forms can not be regarded as phylogenetically connected, but represent different stages in an adapta- tion to a purely herbivorous diet. These fossils are of peculiar interest because of the low geological horizon in which they were found. Mr. Raymond, the discoverer, writes of them as follows: "The bones are from the upper part of the formation which I. C. White has named the Pittsburgh Red Shale (Geol. Survey West Virginia, vol. II, p. 263). This formation is usually from 100 to 125 feet thick in the vicinity and consists of red clays and red and yellow sandstones. At the top there is a bed of almost s
Size: 1538px × 1624px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1910, bookyear1911
