Oxidation-Reduction Indicator Patterns in Three Coelenterates

T IHIS paper is a record of data concerning oxidation-reduction indicator patterns in the egg and early developmental stages of a hydrozoan and of an alcyonarian anthozoan and also of a scyphozoan scyphistoma and of the buds and s'tolons developing from it. It represents studies made at various times during past years which remained unpublished because it was hoped to continue work along this line either on the same or on other species. Since it now appears improbable that such an opportunity will arise and since the data concern large numbers of individuals and are definite in character as regards the patterns shown, it has seemed desirable to record them. They were obtained in part at the Scripps Institution of Oceanography, La Jolla; in part at the Hopkins Marine Station, Pacific Grove; and in part on material brought from the Hopkins Station to Palo Alto. The material and facilities provided by the marine laboratories are gratefully acknowledged.