1. 1963
2. An ecological study of Chaetogaster limnaei( von Baer)

   Awdur: Gruffydd, L. D., Ebr 1963

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

3. 1960
4. Seasonal changes in the plankton of inshore waters: with special reference to the life history of certate copepods

   Awdur: Haq, S. M., 1960

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

5. 1959
6. Calcareous algae of the silurian of the Welsh border

   Awdur: Green, H., Ebr 1959

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

7. 1958
8. A Study in the Experimental Taxonomy of some British Sphagha (section Cuspidata),with observations of their ecology.

   Awdur: Agnew, S., 5 Mai 1958

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth