. Bulletin. Natural history. RUSSELL: AMERICAN MOSASAURS 141 tion and the meaning of the converging margins of the posterior surfaces of tire above- mentioned parietals. The infrastapedial process and a vertical keel beneath the stapedial pit on the medial shaft of the quadrate are independently variable in development in different specimens of New Jersey Mosasaurus. These processes are always present, however, and so far as can be told there is no taxonomic significance to their variation. A coronoid (USNM 10540) from tlie Coon Creek Formation of McNairy County, Tennessee, described by Gilmor
. Bulletin. Natural history. RUSSELL: AMERICAN MOSASAURS 141 tion and the meaning of the converging margins of the posterior surfaces of tire above- mentioned parietals. The infrastapedial process and a vertical keel beneath the stapedial pit on the medial shaft of the quadrate are independently variable in development in different specimens of New Jersey Mosasaurus. These processes are always present, however, and so far as can be told there is no taxonomic significance to their variation. A coronoid (USNM 10540) from tlie Coon Creek Formation of McNairy County, Tennessee, described by Gilmore in 1926, is referred to M. maximiis. Genus AMPHEKEPUBIS Mehl 1930 Amphekepubis Mehl, 1930, p. 383. Generic Type. Amphekepubis johnsoni Mehl 1930. Diagnosis. Transverse processes of pygal vertebrae relatively long. Acetabular surfaces of pelvic elements concave, form nearly solid, smoothly surfaced bowl. Obturator foramen located near center of proximal end of pubis; dorsoanterior process exceedingly long and slender, distally pointed. Ischiadic tubercle small, distinctly separated from acetabulum by moderately short neck. Shaft of ischium broad, slightly. Text-fig. 8L Lateral view of type pelvic girdle of Amjjhekepubis johnsoni (after Mehl, 1930, pi. 65. X %).. 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 perfectly resemble the original Peabody Museum of Natural History. New Haven, Peabody Museum of Natural History, Yale University
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