. Bulletin - United States National Museum. Science. 154 UNITED STATES NATIONAL MUSEUM BULLETIN 2 4'; through this foramen follow the groove leading therefrom on their upward course between the anterior and posterior vestiges of the lateral ridge (fig. 66b) to and thence through the centrally located foramen in the pedicle of the neural Figure 64.—Views of sixth caudal, USNM 16567, of Diorocetus hiatus: a, anterior view; b, lateral view. Abbrs.; mp., metapo- physis; tr., transverse process. On the ventral face of the (pi. 56, fig. 7) on each side the anterior and the posterior
. Bulletin - United States National Museum. Science. 154 UNITED STATES NATIONAL MUSEUM BULLETIN 2 4'; through this foramen follow the groove leading therefrom on their upward course between the anterior and posterior vestiges of the lateral ridge (fig. 66b) to and thence through the centrally located foramen in the pedicle of the neural Figure 64.—Views of sixth caudal, USNM 16567, of Diorocetus hiatus: a, anterior view; b, lateral view. Abbrs.; mp., metapo- physis; tr., transverse process. On the ventral face of the (pi. 56, fig. 7) on each side the anterior and the posterior haemal tubercles are connected by an isthmus of equivalent width which forms a bridge over the centrally located foramen for passage of the segmental blood vessels. The longitudinal haemal groove is broad, deeply concave, and of equal width throughout its length. This vertebra is not represented in the other series of caudal vertebrae (USNM 23494). Ninth Caudal: Both ends of the centrum (USNM 16567) are hexagonal; die anterior epiphysis is ovoidal in oudine and the posterior epiphysis circular. The tendency for the posterior end (fig. 67b) of the centrum to become smaller than the anterior end apparendy commences with the ninth caudal. On each side of the ventral surface of the centrum (pi. 56, fig. 8) the anterior haemal tubercle is united by a broad istlimus with the posterior tubercle. This osseous isthmus is pierced laterally at the middle of its length by a foramen (fig. 67b) for the passage of the seg- mental blood vessels that continue their upward course through a vertical canal that pierces the lateral face of the centruni for a distance of 50 to 55 mm.; these vessels apparently reach the anterior end of the neural canal via an obliquely directed broad groove leading from the upper orifice of this canal. The median ventral haemal groove is transversely widened at the middle of its length and is deeply concave and more ovoidal than elongate. The neural arch is low and
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