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First tooth in question is from the Eocene Bashi Formation, Mississippi. Both Nebrius and Ginglymostoma are described in the formation. With this tooth, I think it’s Ginglymostoma but I figured it was better to post it and get some additional opinions. It’s around 5-6mm.

I'm hoping someone will have a pdf of some fossil shark papers by Gerald Case. I'm finding that many of his papers are in journals that my university does not have a subscription to. In particular I am trying to identify sharks/rays/fish that I picked from a bucket of Bashi Formation matrix (early Eocene) so the first paper is most useful to me. However there are others that cover other sites I have collected so I'll go for broke and hope someone has some of these they are willing to share. Case, G. R. 1994. Fossil fish remains from the late Paleocene Tuscahoma and early Eocene Bashi Formations of Meridian, Lauderdale County, Mississippi. Palaeontographica Abteilung A, 230:97-138. CAPPETTA, H. & CASE, G.R. (2016)A Selachian Fauna from the Middle Eocene (Lutetian, Lisbon Formation) of Andalusia, Covington County, Alabama, USA. Palaeontographica, Abt. A, 307 (1–6): 43 – 103 CASE, G.R. & BORODIN, P.D. (2000)Late Eocene selachians from Irwinton Sand Member of the Barnwell Formation (Jacksonian), WKA mines, Gordon, Wilkinson Country, Georgia. Münchner Geowissenschaftliche Abhandlungen, (A), 39: 5–16, 5 pl., 3 fig., 1 tabl. CASE, G.R. & BORODIN, P.D. (2000)A Middle Eocene Selachian Fauna from the Castle Hayne Limestone Formation of Duplin County, North Carolina. Münchner Geowissenschaftliche Abhandlungen, (A), 39: 17–32, 7 pl., 1 fig. CASE, G.R. (1987)Borodinopristis schwimmeri, a new ganopristine sawfish from the Upper Blufftown Formation (Campanian) of the Upper Cretaceous of Georgia. Bulletin of the New Jersey Academy of Sciences, 32 (1): 25–33, 6 fig. Thanks! Don