| Gastropods from the middle to upper Mississippian Chainman Shale, western Millard County, Utah, not far from the eastern border of White Pine County, Nevada. Photograph courtesy Mackenzie Gordon Jr. and Ellis L. Yochelson; I edited and processed the image through photoshop. Specimens: 1-4--Euphemites sp.; 5, 6--Euphemites nevadensis; 7, 8--Retispira stenopsis; 9-11--Euphemites cracens; 12-13--Retispira jensenensis; 14, 15--Euphemites sacajawensis; 16. 17--Retispira sp.; 18-21--Retispira nolani; 22-29--Retispira ordinata; 30, 31, 36--Retispira textilis; 32-35--Retispira cincta. |