. Bulletin - United States National Museum. Science. Fig. 52.—Right hind foot of Stegosaukus sp. Cat. no. 4280, About i NAT. size. Deawn articulated. s, Sesamoid; t, tuberosity; I, II, III, digits one, two, and three. Ungual on digit III probably pertains to digit one. The slightly concave proximal articular surface does not reach the back but the bone develops a strong, roughened, overhanging tuberosity for ligamentary attach- ment. The shaft is constricted, the distal end about evenly expanded, with broad, shallow median groove. The distal articular surface extends well up on the an
. Bulletin - United States National Museum. Science. Fig. 52.—Right hind foot of Stegosaukus sp. Cat. no. 4280, About i NAT. size. Deawn articulated. s, Sesamoid; t, tuberosity; I, II, III, digits one, two, and three. Ungual on digit III probably pertains to digit one. The slightly concave proximal articular surface does not reach the back but the bone develops a strong, roughened, overhanging tuberosity for ligamentary attach- ment. The shaft is constricted, the distal end about evenly expanded, with broad, shallow median groove. The distal articular surface extends well up on the anterior face of the shaft, as it does in all three metatar- sals. On the external side of the anterior surface, below the center, a vertically elongated, tuberosity with roughened surface is developed, as shown in figure 52, t. Metatarsal III has an irregularly rounded ])roximal end, with slightly concave, roughened articular surface. The shaft is constricted in all diame- ters, but more especially the trans- verse. The distal end has two surfaces which meet at an obtuse angle on the internal third of this end. The rounded internal surface articulates with the first phalangial, while the external surface turns somewhat backward, remaining free. Metatarsal IV consists of a small, slightly flattened element, with rounded distal and a pinched-off proximal end, the latter without articular surface. If my interpretation of the respective ends is correct, then this digit would have one or more phalanges; but on the other hand, if they have been reversed it would repre- sent all that remains of this digit. The upper end is somewhat roughened, as shown in figure 53. Phalanges.—The complete phalangial formula of the hind foot of Stegosaurus is unlmown. The partially articulated foot (No. 42S0) shown in plate 21, figure 1, has the proximal row of pha- langes of digits I, II, and III preserved in their proper relations to the metatai-sals, and is the only specimen in the collection in
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