Description of Parts of the Skeleton of an Anomodont Reptile ( Platypodosaurus robustus , Owen). Part II. The Pelvis

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Abstract
The pelvis of Platypodosaurus , which has been relieved from the matrix since the communication of the former paper, includes five sacral vertebræ (Pl. X. fig. 1, 1–5 ), the right “os innominatum,” 62–64 , and a large proportion of the iliac constituent of that of the left side. Of the first, or foremost, sacral vertebra, s 1 , the part of the centrum in advance of the transverse processes, d 1 , is broken away, but so as to show the apex of the anterior conical articular cavity. The lumbar vertebra, which was articulated therewith, but had become dislocated therefrom, is preserved in the contiguous matrix; and the shape and depth of the articular cavity of its centrum are exposed (Pl. X. fig. 5). The transverse process of the first sacral, d 1 , including both di- and pleurapophysial elements, is short and massive: measuring one inch and a half in antero-posterior diameter at its middle and narrowest part, it rapidly expands to its articulation (and what appears to be its confluence) with the ilium, 62 . Behind the transverse process the centrum is moderately constricted, but expands to form the joint with the second sacral, of which joint the transverse diameter is 2 inches. The breadth of the entire vertebra is 4½ inches. The centrum of this second sacral vertebra ( s 2 ) shows a greater degree of contriction and a narrorew inferior or vebtral surface. The transverse process (ib.fig1, d 2 ) extends from the anterior two thirds of the upper part of the side

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