. Bulletin. Natural history. PEABODY MUSEUM BULLETIN 23 '^SAU»£0UCUS cv« lOfSlt* s^tw»' ,»t«. Text-fig. 96. Mosasaur skulls in the Marsh collections at the U. S. National Museum and Peabody Museum at Yale, collected from the Smoky Hill Member, Niobrara Chalk of western Kansas. Total number of generically recognizable skulls = 398. Sixty-two per cent of these skulls belong to the genus Platecarpus, 25% to Tylosaurus and 13% to Clidastes. Ectenosaurus, which makes up 1% of the Marsh collection, has been omitted. Of the skulls identifiable to the species level: In Platecarpus are cory
. Bulletin. Natural history. PEABODY MUSEUM BULLETIN 23 '^SAU»£0UCUS cv« lOfSlt* s^tw»' ,»t«. Text-fig. 96. Mosasaur skulls in the Marsh collections at the U. S. National Museum and Peabody Museum at Yale, collected from the Smoky Hill Member, Niobrara Chalk of western Kansas. Total number of generically recognizable skulls = 398. Sixty-two per cent of these skulls belong to the genus Platecarpus, 25% to Tylosaurus and 13% to Clidastes. Ectenosaurus, which makes up 1% of the Marsh collection, has been omitted. Of the skulls identifiable to the species level: In Platecarpus are coryphaeus (26 individuals) are ictericus (89 individuals) In Tylosaurus are proriger (19 individuals) are nepaeolicus (17 individuals) In Clidastes '.% are propytlion (33 individuals) 26% are liodontus (12 individuals) 2% are stertibergi (1 individual) The average number of elements collected of the skulls of specifically recognizable specimens is indicated by the numbers on the vertical radius. Thus in Clidastes propython on the average about elements were collected of each skull. This is presumably an indication of how many elements were originally preserved. It may be possible to divide the Smoky Hill Chalk into two zones on the basis of mosasaur species (see te.\t), specimens from which would be mixed in this chart. Note that the three species from the lower zone (Clidastes liodontus, Platecarpus coryphaeus, Tylosaurus nepaeolicus) are apparently more completely preserved on the average than the other 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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