. Bulletin. Natural history. Text-fig. 25. Left quadrate of Platccarpus iciericus (AMNH 1820, X i^). A. Lateral aspect. B. Anterior aspect showing outlines of muscle attachments. C. Medial aspect. rugosity is present at the dorsal apex of this triangular concavity in Clidastes, Mosasaurus and Plotosaurus which is lacking in Platccarpus, Plioplatecarpus, Prognathodon and Tylosaurus. Just beneath and lateral to this apex is a small foramen which passes through the quadrate between the main vertical shaft and the tympanic ala in Clidastes, Mosasaurus, Platccarpus and Tylosaurus. On the upper thir
. Bulletin. Natural history. Text-fig. 25. Left quadrate of Platccarpus iciericus (AMNH 1820, X i^). A. Lateral aspect. B. Anterior aspect showing outlines of muscle attachments. C. Medial aspect. rugosity is present at the dorsal apex of this triangular concavity in Clidastes, Mosasaurus and Plotosaurus which is lacking in Platccarpus, Plioplatecarpus, Prognathodon and Tylosaurus. Just beneath and lateral to this apex is a small foramen which passes through the quadrate between the main vertical shaft and the tympanic ala in Clidastes, Mosasaurus, Platccarpus and Tylosaurus. On the upper third of the anterior face of the quadrate in all seven of these genera there is a smaller shallow depression, in the form of an inverted triangle, located between the quadrate shaft and the tympanic ala. It is probable that this region provided an area of origin for dorsal fibers of the M. adductor mandibulae ex- temus profundus, since this muscle originates over nearly the entire rostral sur- face of the quadrate in Varanus. The dorsolateral one-third to one-half of the anterior face of the quadrate is made up of the tympanic ala proper. The suprastapedial process is large in all mosasaurs, curving ventrally to. 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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