|Caecum cycloferum de Folin, 1867 Fat Lip Caecum|
|Treasure Beach (Billy's Bay), St. Elizabeth Parish, Jamaica (2.5 mm.). Digital images by David Kirsh.|
|Scanning Electron Micrographs (SEM) Of Fossil Specimens|
Lower Pinecrest beds, Upper Tamiami Formation, Sarasota County, Florida. SEMs produced in collaboration with Dr. Ann Heatherington, Dept. Geological Sciences, University of Florida, Gainesville, FL. This species is cognate with the Panamic Province Caecum subspirale Carpenter, 1857. Both taxa may exhibit clockwise rotation of the longitudinal sculpture at certain stages of growth. Caecum coronellum Dall, 1892, described from both Plio-Pleistocene and Recent material, is a synonym.