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1. The effect of various monosaccharides on the potential difference across the intestine of the invertebrate, Cryptochiton stelleri, was studied using an everted sac technique.

2. D-Glucose, when present in the mucosal solution, increased the transmural potential across the anterior intestine but had no effect on electrical potentials across the posterior intestine.

3. D-Galactose, when present in the mucosal solution, increased the transmural potential across the posterior intestine but had no effect on electrical potentials across the anterior intestine.

4. D-Fructose and D-mannose, metabolizable but non-transported sugars, increased anterior intestinal potentials but not posterior intestinal potentials.

5. 3-O-methylglucose, an actively transported (across the anterior intestine) but non-metabolizable sugar, did not alter potentials across either the anterior or posterior intestine.

6. The addition of D-glucose to the serosal solution increased anterior intestinal potentials, but the serosal addition of D-galactose did not affect posterior intestinal potentials.

7. NaF, phlorizin and anoxia prevented the increase in potential across the anterior intestine and phlorizin (10^-4 but not 10^-6 M) and NaF but not anoxia prevented the increase in potential across the posterior intestine.

8. It was suggested that the effect of glucose on anterior intestinal potentials was a metabolic effect, whereas the effect of galactose on posterior intestinal potentials was related to the active transport of that sugar from mucosa to serosa.