123 
V 
IV 
Septibranchia 
Anatinacea 
Teredinidae 
Phol^didae 
Myidae 
Lutrariidae 
Gastrochaenidae 
Saxicavidae 
Solenidae 
Psammo&iidae 
Scrobiculariidae 
Tellinidae 
Mesodesmatidae 
Donacidae 
Mactridae 
12 3 
