the postoi'ior adductor muscle, una wuici; il; cintinuous 

 witli the epibranchial cavity behind the visceral ranfrlion. 

 i::u u:.''!! ciivitj' is occiipied mostly by the loot , aiici :;y 

 the two adductor muscles wliich are common to most Lamel- 

 libranchs. 



