![Hay, 1899 Plate 6; Figured as the Acherontemys heckmani holotype carapace. Eocene (Middle Eocene); Roslyn Formation; Northwestern Improvement Company No. 4 Mine, Roslyn, Washington, USA Department of vertebrate paleontology, National Museum of Natural History, Smithsonian Institution, Washington, District of Columbia; specimen #V4213.](http://upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Acherontemys_heckmani_holotype_USNM_V4213_img3.jpg/505px-Acherontemys_heckmani_holotype_USNM_V4213_img3.jpg)
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