. Carnegie Institution of Washington publication. . Fig. 28.—A, cervical ribs of Ophiacodon mints Marsh, X K- B, dorsal rib of Seymouria bayloreiisis Broili, X i; C, right ilium of Ophiacodon mirus Marsh, inner side, X }4. seventh the ribs are all cylindrical and slender to their extremities, becoming quite short in front of the sacrum. The first three cervical ribs, those articulating with the atlas, the axis, and the third vertebra, are short, and but little dilated distally, attached exclusively, it seems, to the diapophysis. Ventral ribs: The size and characters of the ventral ribs are bes
. Carnegie Institution of Washington publication. . Fig. 28.—A, cervical ribs of Ophiacodon mints Marsh, X K- B, dorsal rib of Seymouria bayloreiisis Broili, X i; C, right ilium of Ophiacodon mirus Marsh, inner side, X }4. seventh the ribs are all cylindrical and slender to their extremities, becoming quite short in front of the sacrum. The first three cervical ribs, those articulating with the atlas, the axis, and the third vertebra, are short, and but little dilated distally, attached exclusively, it seems, to the diapophysis. Ventral ribs: The size and characters of the ventral ribs are best shown in the photographic illustration (pi. i, fig. i). They formed a large sheet in the specimen as found, covering the whole of the space back of the coracoids and between the ends of the ribs, quite to the pelvis. They are very slender, and lie closely together, each meeting its mate in the middle in an acute V. The length of no individual rib can be determined, since they are all more or less broken into short, contiguous pieces. It is possible that some of them, if not many, were continuous throughout their whole lengths. Pectoral girdle and extremity: The pectoral girdle and both anterior extremities lay quite in natural arrangement as found in the specimen, except that the right scapula had been pushed downward and a little forward, an inch or two from its natural place; and the left hand was partly concealed beneath the posterior dorsal vertebrae. The right arm and hand, closely articulated throughout, were directed downward and forward; the inner fingers were doubled under the outer, ulnar ones. The interclavicle, preserved in place, has a broad, thin, flattened stem, some- what convex below, and a moderately dilated anterior extremity. The stem extends backward, as articulated, about an inch beyond the posterior angles of the coracoids. In the present specimen (No. 650) it is somewhat flattened by pressure;. Please note that these images are extracted from scanned
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1910, bookyear1913
