CHANGES IN THE LEVEL OF ARGININE PHOSPHATE FOLLOWING FERTILIZATION OF ECHINODERM EGGS *

The content of arginine phosphate was measured following fertilization of sea‐urchin eggs and starfish oocytes. In sea‐urchin eggs, a rise in the level of arginine phosphate occurred within 2 min after insemination: this was not accompanied by any detectable alteration in the level of ATP. On the other hand, the level of arginine phosphate in starfish oocytes did not change on fertilization.