Bull. U. S. B. F., 1930. (Doc. 1097.) 
Figure 1 . — Zampsilis anodovtoides, yellow sand-shell, natural size. Living animal with foot completely extruded show- 
ing the relatively large volume of this organ and the demand such expansion makes on the blood and body fluids. 
The animal is supported on the far side by a glass rod attached to the valve of the shell by beeswax 
Figure 2 . — Zampsilis anodovtoides, yellow sand-shell. Living animal (same as Fig. 1) with one valve of shell removed 
to show size and position of foot. Heart may be seen just below the open space near middle of the hinge 
