FIVE FIQUBES
During the annual reproductive cycles the gonads of a number of echinoderms show a marked growth to the point that at the height of the season the body cavity of a sea urchin becomes practically filled (Lasker and Giese, '54 ; Bennett and Giese, '55; Giese, '58) and the body wall of a starfish bulges with gonads (Farmanfarmaian et al., '58). I n the sea urchin little elaborated food is stored outside the gonad, although some storage occurs in the intestinal epithelium (Hilts and Giese, '49). However, a large amount of undigested food is usually found in the festoons of the intestine of sea urchins. This may remain in the gut for many weeks, feces being formed for over two weeks. After prolonged starvation green pellets remain in the gut preceding the rectum, the pellets containing diatom skeletons and pieces of chitinous skeletons. I n the starfishes studied the pyloric caecae or digestive3 glands are largest when the gonads are smallest and shrink Supported in part by NSF Grant GS 482 and USPH Grant 4578 t o A. C. Giese and supplementary funds from the Rockefeller Foundation. We are indebted to Professor L. R. Blinks, Director of the Hopkins Marine Station, for providing facilities for the study, to Mr. John Bennett and Dr. A. T. Giese for statistical advice and cartographic help and to Mrs. Molly Lusignan for cartographie assistance.