The Effects on the Fat and Starch Metabolism of Gebia by the Parasite Gyge Branchialis

1. Males of Upogebia littoralis parasitized by Gyge branchialis show a marked increase in fat content from 1·04 to 1·6%. 2. Parasitized females have a fat content practically the same as that of ordinary non-ovigerous females, 1·2%. 3. Ovigerous females have a fat content considerably higher than that of parasitized males or non-ovigerous females, namely 2·2%. 4. The parasite Gyge has a relatively high fat content, 4·4%. 5. There is a significant diference in glycogen content between normal males and females. 6. There may be a slight increase in glycogen following parasitization. 7. The results are essentially in agreement with the theory of metabolic stimuli put forward by Geoffrey Smith.