. Carnegie Institution of Washington publication. l3S Element. Nucha] . .. Peripheral I progress with the description. 1 hat which especially strikes one is the greater thickness of the bones here desci ibed, as compared with corresponding ones of 0. emarginatus and 0. gibbi. The three types are of nearly the same size. The dimensions of various bones are given in the following table. Except the length, the dimensions of each bone are taken at the anterior end. The thickness of the nuchal is taken at the midline. The columns headed by I belong to 0. emarginatus; those bv 2. t
. Carnegie Institution of Washington publication. l3S Element. Nucha] . .. Peripheral I progress with the description. 1 hat which especially strikes one is the greater thickness of the bones here desci ibed, as compared with corresponding ones of 0. emarginatus and 0. gibbi. The three types are of nearly the same size. The dimensions of various bones are given in the following table. Except the length, the dimensions of each bone are taken at the anterior end. The thickness of the nuchal is taken at the midline. The columns headed by I belong to 0. emarginatus; those bv 2. to 0. gibbi; those by 3, to 0. robustus. The nuchal bone (fig. 147) appears to have extended backward further in this than in the species with which it is compared above. The hinder portion of the bone is broken away, but the por- tion remaining is 80 mm. wide antero- posteriorly. The nuchal of 0. emargina- the nuchal of 0. gibbi has a length of 75 mm. Fig. 148 is a section at the articulation between the nuchal and the first peripheral. The upper border of the first peripheral, articulating with the first costal, has a thickness of 10 mm. ' fig. 14S 1, The left second peripheral lacks the hinder end; and that of the right side has the hinder end of the inner face so eroded that it does not show the pit for the hyo- plastron. These peripherals articulated with the first costal. The other peripherals are missing to the ninth, and of these only unimportant fragments remain. The tenth and eleventh (fig. 149) are nearly plane above, or slightly convex. The rib-pits are flat; and that of the 1 igth Height. Thickness. 1 :; 'â¢" i»5 1 1 15 lb 20 â¢â ; 79 78 .p bo 19 1 " ;o Sj »1 +h ho 60 20 2 1 *5 <JO 89 III 110 '4 18 81 â¢10 110 100 _L "M «3 H -1 68 20 tus measured in the same place gives us 70 Fig. 147.âOsteopygis robustus. Nuchal bone and first peripheral right and left, of type. X4. nu. 5, nuchal scute; per. I, first peripheral. tenth
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