1. Paleontology and the study of variation in living foraminifera.;Arnold;Cushman Found. Foram. Res. Contr.,1953
2. Discorinopsis aguayoi (Bermudez) and Discorinopsis vadescens Cushman and Bronnimann: a study of variation in cultures of living foraminifera.;Arnold;Cushman Found. Foram. Res. Contr.,1954a
3. Culture methods in the study of living foraminifera.;Arnold;J. Paleontol.,1954b
4. Life history and cytology of the foraminiferan Allogromia laticollaris.;Arnold;Univ. Calif. Publ. Zool.,1955
5. A laboratory system for maintaining small-volume cultures of foraminifera and other organisms.;Arnold;Micropaleontol.,1966