. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 1Iatciii:r: I-oki'. Limi; anh M \\i^ oi 'Rus. 3()7 with the description given by Usboni and (iranger of the supposed scaphodunar in I)ii)lodocus, and with those authors I agree in making it homologous with tiiat element in the mammalian carpus. If my interpretation of the position of this bone in the manus is correct the following description of this element would apply. The general form is that of a circular disc, thin in front l)ut considerably thickened posteriorly. The superior
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 1Iatciii:r: I-oki'. Limi; anh M \\i^ oi 'Rus. 3()7 with the description given by Usboni and (iranger of the supposed scaphodunar in I)ii)lodocus, and with those authors I agree in making it homologous with tiiat element in the mammalian carpus. If my interpretation of the position of this bone in the manus is correct the following description of this element would apply. The general form is that of a circular disc, thin in front l)ut considerably thickened posteriorly. The superior surface is crossed antero-posteriorly by a low, broad ridge which divides it into two slightly concave and sub- equal surfaces, the larger and smoother of which was for articulation with the external half of the distal end of the radius, while the smaller and more rugose surface articulated with the internal portion of the distal articular surface of the ulna. Inferiorly this bone pre- sents a gentle convex, polished, but corrugated surface for articulation with metacarpals II., III. and IV. No other carpals were found with or near this foot, and after a careful study of it and the articular surfaces of the distal ends of the radius and ulna and considering the position in which nieta- carjials II., III. and IV. lay with refer- ence to these bones and metacarpals!., ^'^- '°- Right scapho- j ,, , . , -»-ri' 1 lunar front view seen obliquely and \., as shown in i)laies XIX. and , , , / , ' from above, about one-fourth XX., it appears quite probable that it natural size. (No. 563.) was the only ossified element i)resent in the carpus of Brontosaurus and therefore that the Brontosaur carpus, like the tarsus, consisted of a single element. An oblique front view of this bone is shown in Fig. Princii'AL Dimensions. Greatest transverse diameter 203 mm. 7H in, " fore and aft " 155 " e/s " " thickness 55 " 2/i " T/ie Metacarpals.—All the elemen
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