. Carnegie Institution of Washington publication. 110 A REVISION OF THE COTYLOSAURIA OF NORTH AMERICA Diadectidce. The condyles are not well developed; the articular face on the proxi- mal end is not distinct. The shaft is slender and has a triangular section. There is a distinct entepi- condylar process, an entepicondylar foramen, and a well-marked hemispherical articular process for the head of the radius, almost entirely on the anterior surface of the bone. In the descriptions of Labidosaurus by Case and Williston the humerus was described as not having an entepicondylar foramen, but this w
. Carnegie Institution of Washington publication. 110 A REVISION OF THE COTYLOSAURIA OF NORTH AMERICA Diadectidce. The condyles are not well developed; the articular face on the proxi- mal end is not distinct. The shaft is slender and has a triangular section. There is a distinct entepi- condylar process, an entepicondylar foramen, and a well-marked hemispherical articular process for the head of the radius, almost entirely on the anterior surface of the bone. In the descriptions of Labidosaurus by Case and Williston the humerus was described as not having an entepicondylar foramen, but this was an error due to the condition of the specimen. Only the proximal ends of the ulna and radius are known. The first shows a definite, but not well-developed olecranon process. "The front foot (fig. 48, d) of the left side has been preserved; the distal ends of the radius and ulna are nearly in their normal positions; the bones of the carpus are all present, with the possible exception of the first carpal of the distal row. There are well-formed scaphoid and cuneiform bones, and between these an elongate element that was at first regarded as the missing metacarpal I, but it seems more probable that it is the lunare (inter- medium); the upper end is incomplete, and the lower is much the same in appearance as the end of the metacarpals; on the other hand, it occupies just the position of the. Fig. 49.—Labidosaurus. Am. Mus. X §. A. Distal portion of the tarsus. Dorsal surf ace. B. Ventral surface of same. C. Restoration of tarsus. After Williston. intermedium, in a carpus that has been preserved in a very perfect manner, and it fits the position it occupies very accurately. According to this interpretation there are two centrale. There are four bones in the distal row of the carpus; the first is very much larger than the others, and appears to represent the first and second combined; the outer edge is a rounded process, with no face for articulation with another c
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