. Carnegie Institution of Washington publication. MORPHOLOGICAL REVISION 89 The centrum of the eighteenth is of much smaller diameter but of greater length than the anterior vertebrae, and has very prominent neural and hsemal spines. These are high and narrow with expanded extremities and give the vertebra a flattened appearance vertically. The distal ends of the neural and haemal spines are heavy, with flat rugose faces, which have the appearance of having been attached to heavy plates of cartilage or perhaps bone. On the last vertebrae observed the distal ends of the hsemal spines are so elo
. Carnegie Institution of Washington publication. MORPHOLOGICAL REVISION 89 The centrum of the eighteenth is of much smaller diameter but of greater length than the anterior vertebrae, and has very prominent neural and hsemal spines. These are high and narrow with expanded extremities and give the vertebra a flattened appearance vertically. The distal ends of the neural and haemal spines are heavy, with flat rugose faces, which have the appearance of having been attached to heavy plates of cartilage or perhaps bone. On the last vertebrae observed the distal ends of the hsemal spines are so elongate that they touch the spines of the adjacent vertebrse. The ribs are relatively heavy and short, with little curvature and widely separate capitulum and tuberculum. The clavicles and interclavicle (plate 12, fig. 3) unite to form a thin, heart-shaped plate, covered on the outer surface with a sculpture similar to that of the skull. The clavicles overlap the anterior end of the interclav- icle below. From the outer edge of the clavicle a smooth, conical process extends upwards and inwards, possibly for the attachment of the scapula. The interclavicle is rhomboidal, with no posterior prolongation; the posterior edge is marked as if by the squamous attachment of some element, unknown as Fig. 23.—D. magnicornis. After Williston. No. 652 Univ. of Chicago. X K- A. Dorsal view of right humerus. D. Posterior view of femur. B. Lower view of same. E. External view of same. C. Cross-section of proximal end of same. The coracoid: Williston has discovered a small oval plate lying on the upper side of the clavicle in specimen No. 652 University of Chicago, and less perfect remains of this bone are found in specimens No. 4539 and 4748 Am. Mus. It is thin, nearly oval in shape, with a slight thickening of the posterior part to receive the humerus. A small foramen pierces the inner side, back of the middle and not far from the edge. The scapula is unknown. Previous to 1909, none of
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