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THURLOW C. NELSON 



int 



9 



Fig. 8 Martesia; median transverse section of entire body, gfs, gastric shield; 

 hp, hepatopancreas; int, intestine; st, crystalline style; stc, caecum of the crystal- 

 line style; sto, stomach. 



Fig. 9 Anodonta grandis; enlarged view of the surface of the typhlosoles, 

 intestine, and style sac, opened from right side, int, intestine; sts, style sac; 

 t ma, major typhlosole; t mi, minor tj^phlosole. 



