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A new large Late Cretaceous lamniform shark from North America, with comments on the taxonomy, paleoecology, and evolution of the genus Cretodus Kenshu Shimada &Michael J. Everhart Article: e1673399 | Received 30 Nov 2018, Accepted 09 Sep 2019, Published online: 18 Nov 2019 LINK (description of Cretodus houghtonorum n.sp) edit:5,30 MB,or thereabouts relevant: Philosophical Transactions of the Royal Society of London. Series B, Containing Papers of a Biological Character Vol. 210 (1921), pp. 311-407 V I I I .— On the Calcification o f the Vertebral Centra in Sharks and Rays. B y W . G. R id e w o o d, D.Sc. 18 MB!!