Olsson, A. A., and Harbison, A., 1953. Pliocene Mollusca of Southern Florida with Special Reference to those from North Saint Petersburg. Monographs of the Academy of Natural Sciences of Philadelphia, 8.
        
            New Species-Group Names:
            
                - 
                    robertsi Olsson & Harbison, 1953. p. 175. pl. 26. f. 3. 
                
                 
                - 
                    spuroides Olsson & Harbison, 1953. p. 172. pl. 26. f. 1-1d.