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THE AMEBIC AN NATURALIST [Vol. XLIV 



cardiac portion of the stomach by a gradual constriction. 

 The stomach is clearly preserved as a distinct sac-like 

 organ with two lobes which correspond to the cardiac and 

 pyloric limbs. The stomach measures about seven milli- 

 meters in length by two millimeters in its greatest diam- 



eter. The muscular constriction which divides the organ 

 into pyloric and cardiac divisions occurs at a distance of 

 four millimeters from the upper end. The pyloris is 

 designated by a rather pronounced constriction which 

 may be partly accidental although it recalls the pyloris 

 of the frogs very strongly. From this constriction, which 

 lies on the left side of the fossil, as it is preserved, the 

 duodenal portion of the intestine makes a straight course 

 posteriorly to near the anal region, where it takes a sharp 

 bend and curves back to run parallel with itself for the 



