Gill Anterior palp 



Siphona. 

 tentacle 



Palp 

 appendage 



Mouth 



Labial 

 palps 



Right 



mantle 



fold 



Inhalant 

 chamber 



Left mantle 

 fold 



Incurrent 



Fig. 5.12. Feeding Currents in Lamellibranchs 



(a) A protobranch Yoldia, with right valve and mantle fold removed. Arrows added 

 to indicate directions of ciliary currents, (b) Ostrea, right valve and mantle fold removed. 

 Within the shell plain arrows denote ingoing currents, and feathered arrows outgoing 

 currents, ((a) after Kellog, 1915; (b) after Yonge, 1926.) 



Latero-fronta-l 

 cilia. 

 FC 



j_ q La.tera.1 

 cilia. 



Food 

 groove 



Fig. 5.13. (a) Lateral View of a Gill Filament of Mytilus edulis. LC, FC, 

 Directions in which Lateral Cilia and Frontal Cilia Lash, (b) Gill Fila- 

 ment of Heteranomia squamula in Transverse Section, ((a) from Orton, 1912; 



(b) from Atkins, 1936.) 



