a1 Department of Zoology, University of Illinois, Urbana, Illinois 61801
A new mutation, Em, is described for T. pyriformis, syngen 1. This dominant mutation eliminates the normal immature period in heterozygotes but is lethal in the homozygous state.
This paper is dedicated to Dr. Ralph Cleland in honor of his 75th birthday.
(Received July 21 1967)
* Research was supported by a grant to Professor D. L. Nanney (GM-07779) from the National Institutes of Health.