Contents

01 July 1988
Vol 241, Issue 4861

About The Cover

A scanning electron micrograph of the shell of Margarites sp. recovered from the feces of Asemichthys taylori. The holes in the shell, produced by the vomerine teeth of the predator, allow digestive enzymes access to the body of the prey. The shell is approximately 2 micrometers in width. See page 92. [S. F. Norton, University of California, Santa Barbara, CA 93106, and T. Rice, Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138]