Bull. U. S. B. F., 1930. (Doc. 1097.) 
Figure G.—Actinonais carinata, river mucket, natural size. Living animal with foot partly extended 
Figure 7. — Living animal (same as Fig. 6) a few minutes later, with one valve of shell removed to show volume of foot. 
The heart may be seen lying along inside of shell just below hinge. The line of demarcation between foot and visceral 
mass may be followed as a shallow groove separating the rather rugose foot from the smooth visceral mass. This 
groove was followed when cutting off the foot strips 
