Description of Parts of the Skeleton of an Anomodont Reptile ( Platypodosaurus robustus , Ow.) from the Trias of Graaff Reinet, S. Africa

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Abstract
I n a former paper† a dental character in a Triassic reptile was indicated which is repeated in some implacental members of the Mammalian class. I have also noticed a like correspondence in the skeleton of another reptile from the same formation in South Africa‡. Pursuing the work of extricating from the matrix the Triassic fossils since received from that continent, indications still more interesting of such relationship have come to light, which I now proceed to submit to the Geological Society. The evidence of the genus and species of extinct reptile above named, forming the subject of the present paper, consists of a series of seven thoracic vertebrae, with portions of ribs, a sternal bone, scapula, and a right humerus, all cemented to a mass of dark quartzose rock. A smaller mass included a femur with the pelvis; but the latter is still under the chisel. The parts exposed in the first block are the left side of the vertebræ, the scapula, and the whole of the anterior surface of the humerus, which bone remains attached, somewhat behind its natural position, to the right side of the present portion of thorax. Vertebræ.—Of each vertebra the centrum is subcompressed ; the sides are slightly concave lengthwise between the thick convex borders of their mutually articulating terminal surfaces; these are concave (P1. XVI. fig. 1, a, b ), the hinder one ( b ) is the deeper ; the extent of intervening part of centrum ( c ) is 5 lines. The external smooth lateral surfaces slightly

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