Fig. 1 Anodonta grandis; dissection from right side, am, anterior adductor 

 muscfe; ca, opening into dorsal caecum of stomach; /, foot; gs, gastric shield; 

 int, intestine; pm, posterior adductor muscle; st, crystalline style; sto, stomach; 

 t ma, major typhlosole; t mi, minor typhlosole. 



Fig. 2 Lampsilis anodontoides; transverse section through style sac and 

 intestine near anterior end. bm, basal membrane; bv, blood-vessel; int, intestine; 

 rng, mucous gland; st, crystalline style; sts, style sac; t ma, major typhlosole; 

 t mi, minor typhlosole. 



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