. Carnegie Institution of Washington publication. NORTH AMERICA AND THEIR VERTEBRATE FAUNA. 175 The second type of scapula is represented by two or three different forms. The first of these (No. 3437) is shown in plate 24, figures 6and7 and figure 48, /. The posterior edge of the blade is slightly injured by decay, but it is apparent the line was slightly concave. The anterior edge is nearly straight and is directly continuous with the strong anterior edge of the supraglenoid fossa. The supraglenoid fossa is much larger than is common, due to the very pos- terior position of the posterior edge
. Carnegie Institution of Washington publication. NORTH AMERICA AND THEIR VERTEBRATE FAUNA. 175 The second type of scapula is represented by two or three different forms. The first of these (No. 3437) is shown in plate 24, figures 6and7 and figure 48, /. The posterior edge of the blade is slightly injured by decay, but it is apparent the line was slightly concave. The anterior edge is nearly straight and is directly continuous with the strong anterior edge of the supraglenoid fossa. The supraglenoid fossa is much larger than is common, due to the very pos- terior position of the posterior edge, which carries the articular portion of the cotylus. The fossa is deep and at its base there is a deep pit in the position of the foramen in the scapulae described above, but there is no perforation of the bone. The articular surface for the coracoid elements presents a most peculiar outline, due to the strong development of the anterior and posterior edges of the epicondylar fossa. A fragmentary coracoid (No. 3444, fig. 49, a and h) in the collection evi- dently belongs with this type of scapula. So far as can be told, the outline. Fig. 49.âUnnamed reptiles. X %â (a) showing strong ridges and position of the foramen, (t) articular face for scapula of coracoid. No. 3444. (c) posterior edge, (d) outer face of scapula of left side. No. 3436. was rounded, but the proximal portion, where it articulated with the scapula, is marked by two strong ridges, between which lies the foramen. The outline of the articular surface corresponds with the face of the scapula just described. The peculiarities of these bones indicate the existence of an animal that can not be placed in any group as yet described; it is very possible that they belong to some form of amphibian. Another form of scapula, resembling the preceding but smaller, is repre- sented by two specimens, one (No. 3436, fig. 49, c and d) with a fragment of the coracoid attached and one less perfect. The anterior edge of the blade
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