| Fontigens plana Pilsbry in Olsson and Harbison, 1953 | |
| Scanning Electron Micrographs (SEM) Of Extinct Fossil Species | |
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| 3.04 mm. | 2.13 mm. | 
| Dig in Orlando, Orange County, Florida exposing the Nashua Formation (Plio-early Pleistocene). SEMs produced by H. G. Lee in collaboration with Dr. Ann Heatherington, Dept. Geological Sciences, University of Florida, Gainesville, FL. | |