. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Bulletin, So. Calif. Academy of Sciences Vol. 50, Part 1, 1951. PLATE 9 Ventral view of fused group of first six cervical vertebras of Pseudorca crassiclens, 8458. to the main axial ridge and sloping mesa. Three of the skulls were found on this slope, from 75 to 300 yards from high tide line, and at an elevation of 10 to 30 feet above the normal high tide level. The fourth skull was found in the vicinity of an Indian shell mound located at an inlet known as "Dutch ; The
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Bulletin, So. Calif. Academy of Sciences Vol. 50, Part 1, 1951. PLATE 9 Ventral view of fused group of first six cervical vertebras of Pseudorca crassiclens, 8458. to the main axial ridge and sloping mesa. Three of the skulls were found on this slope, from 75 to 300 yards from high tide line, and at an elevation of 10 to 30 feet above the normal high tide level. The fourth skull was found in the vicinity of an Indian shell mound located at an inlet known as "Dutch ; The mound itself was but 100 feet from the normal high tide line. The skull and partial skeleton ( 8458), collected 3 miles west of the sandspit, were found in close proximity to a partial skull and skeleton of the California gray whale, Rhachianectes glaucus. Whether the two species were beached at the same time is, of course, unknown. An unusually heavy storm could account for their deposition above the normal high tide mark. A characteristic of the genus Pseudorca is the fusion of the first six or seven cervical vertebrae. An examination of the ma- terial at hand shows this condition to exist in the three specimens which include the cervical vertebrae. In two ( 8458 and 8459), the first six cervical vertebra are fused, while the seventh is unattached (Plate 9). The third specimen ( 8460), shows anomalous development of these parts (Plates 8 and 10). In this specimen, the entire cervical series is joined; anteriorly, also, the atlas is ankylosed rigidly to the occipital condyles by a necrotic osteons growth, which has nearly obliterated the usual joint region. Both dorsally and ventrally, however, the line of fusion is evident as a more or less definite crack, which pene- 17. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfe
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