Marshall, 1918. The Tertiary Molluscan Fauna of Pakaurangi Point, Kaipara Harbour. Transactions and Proceedings of the New Zealand Institute, 50. (4.21 MB)
 (4.21 MB)
        
            New Species-Group Names:
            
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                    abruptus Marshall, 1918. p. 270. pl. xx. f. 7. 7a. 
                  
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                    convexus Marshall, 1918. p. 270. pl. xx. f. 6. 6a. 
                  
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                    lyratus Marshall, 1918. p. 270. pl. xx. f. 5. 5a. 
                