61 



sus. LYOXSIA. Turton, 1822. 

 1 L. norvegica. Chemnitz, Britain. 



GENUS. THRACIA. Leach, 1824. 

 1 T. villosiuscula McGillivray. Britain. 



GENUS. NE^ERA. Gray, 1834. 

 1 N. cuspidata. Olivier. Britain. 



GENUS. PAXDORA. Brugidtre, 1792. 

 1 P. obtusa. Lamarck. Britain. 



GENUS. MYODORA. Gray, 1840. 

 1 M. ovata. Reeve. Moreton Bay. 



GENUS. MYOCHAMA. Stutchbury, 1830. 

 1 M. transversa. Adams. Moreton Bay. 



GENUS. CHAMOSTREA. DeRoissy, 1805. 



CLEIDOTHEBUS. Stutchbury, 1829. 

 1 C. albida, Lamarck. Sydney. 



ORDER 2. VENERACEA. JITenke, 1830. 



FAMILY 8. MACTRIDJE. Gray, 1840. 

 SUB-FAMILY 1. MACTRIX^E. H. and A. Adams. 



SirW.Denison, 



