GEXEKAL ANAT031Y OF A LA3IELLIBRAXCH. 



275 



Fig. 143. 



Fig. 143.— Semi-diagrammatic view of Anodonta, seen from below 

 [with the inner gills separated from each other, to show the cloacal cham- 

 jber, the posterior adductor muscle and the floor of the organ of Bojanus. 



a. Mantle. aK Branchial siphon, ab. Abdomen, b. Foot. bo. Ex- 

 Itemal opening of the organ of Bojanus. c. Gills, e. Posterior adductor 



