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Abstract
The genus Katelysia in Southern Australia is represented by three species with distinctive but variable shell forms. These range from narrow shells with marked concentric sculpturing to obese shells with little sculpturing. Comparative investigation of the burrowing process of the three species and a possible sub-species of one, revealed that, in general, K. scalarina was the most and K. peroni the least efficient in all phases of burrowing. A theoretical consideration is made of shell characteristics believed to influence burrowing in an attempt to account for the different burrowing efficiencies of the different forms.