Corrections and Clarifications


Science  12 Aug 1988:
Vol. 241, Issue 4867, pp. 774
DOI: 10.1126/science.241.4867.774


The width of the shell shown on the cover of the 1 July issue was given incorrectly in the caption on page 5. The shell is approximately 2 millimeters im width, not 2 micrometers.