|Caecum heladum Olsson and Harbison, 1953 Fine-line Caecum|
|Scanning Electron Micrographs (SEM) Of Fossil Specimens|
Lower Pinecrest beds, Upper Tamiami Formation, Sarasota County, Florida (3.75 mm. on the top, 3.78 mm. in the middle and 3.18 mm. on the bottom). SEMs produced in collaboration with Dr. Ann Heatherington, Dept. of Geology, University of Florida, Gainesville, FL.