1. Ayala, F. J. (1974). Genetic variation, sexual isolation, and evolution. In Bruell, J. (ed.), Prospects in Behavior Genetics, S. Russel Foundation (in press).
2. Ayala, F. J., Powell, J. R., Tracey, M. L., Mourão, C. A., and Pérez-Salas, S. (1972). Enzyme variability in the Drosophila willistoni group. IV. Genic variation in natural populations of Drosophila willistoni. Genetics 70113.
3. Ayala, F. J., Hedgecock, D., Zumwalt, G. S., and Valentine, J. W. (1973). Genetic variation in Tridacna maxima, an ecological analog of some unsuccessful evolutionary lineages. Evolution 27177.
4. Ayala, F. J., Valentine, J. W., DeLaca, T. E., and Zumwalt, G. S. (1974). Genetic variability of the Antarctic brachiopod Liothyrella notorcadensis and its bearing on mass extinction hypotheses. J. Paleontol. (in press).
5. Emig, C.-C. (1971). Taxonomie et systematique des Phoronidiens. Bull. Mus. Natl. Hist. Nat. Ser. 8473.