GENERAL ANATOMY OF A LAMELLIBRANCH. 



275 



FIG. 143. 



FIG. 14.1 Semi-diagrammatic view of Anodonta, seen from below 

 \vith the in,!"r gills separated from each other, to show the cloacal cham- 

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



a. Mantle. l . Branchial Siphon. <///. Abdomen. />. Foot. bo. Ex- 

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



