ventricle 



pericardium 



rectum 

 ^kidney 



f ,* '-dorsal pall/al aperture 

 .- posterior aorta 

 i post, retractor 



mantle 



mantle cavity 



post adductor 

 anus 



visceral ganglion 



exhalant siphon 

 super branchial chamber 



- right gill 



-inhalant siphon 



shell 



pallial groove 



ter mussel, I'nio sp. 



