. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. : Iokk I,imi! and Manus of ]5ront(,)Saurus. 3()9 I. These bones are so interlocked that when placed in position a considerable portion of the proximal end of mc. II. is covered over by the superior border of the cavity in nic. [., while the j)ro\inial. Fig. 12. \'ie\v of proximal extremities of metacarpals of rit^ht manus in position about one-fourth natural size. (No, 563.) end of the latter is raised above that of mc. II. so as to articulate di- rectly with the radius. There is a b
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. : Iokk I,imi! and Manus of ]5ront(,)Saurus. 3()9 I. These bones are so interlocked that when placed in position a considerable portion of the proximal end of mc. II. is covered over by the superior border of the cavity in nic. [., while the j)ro\inial. Fig. 12. \'ie\v of proximal extremities of metacarpals of rit^ht manus in position about one-fourth natural size. (No, 563.) end of the latter is raised above that of mc. II. so as to articulate di- rectly with the radius. There is a broad, shallow excavation on the external lateral surface at the proximal end of mc. II. for the recep- tion of the internal proximal angle of mc. III. The proximal artic- ular surface of mc. II. is broad above and somewhat narrowed in- feriorly. Its superior and inferior margins are bounded by nearly straight, horizontal lines. The surface is very slightly and regularly convex in all directions. The distal articular surface is broad and deep, though in the present specimen the latter diameter has been somewhat diminished by pressure. Just anterior to the rugosity on the internal lateral surface of the [proximal end of this bone there is a deep groove leading obliquely downward and forward to the palmar surface. This may have served for the transmission of a flexor tendon. Metacarpal III. is of equal length, but decidedly more slender than mc. II. The superior surface is smooth and regularly convex. There is a noticeable lateral constriction at about the middle of the distal one-half of the bone. On the internal lateral surface of the proximal end there is a flat area, broad proximally, but narrowed dis- tally, which disappears toward the middle of the shaft. The internal, proximal, lateral angle is so shaped as to fit nicely into the cavity on the external lateral surface of the proximal end of mc. II., causing an interlocking of the proximal ends of these bones. The pr
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