The collections consists of the following items:
- Catalogue of Watson's collection of shells, 2 vols, 1898-1928.
- List of numbered series of shells in Watson's collection, 1 vol.
- Hand paintings of cowrie shells in the Museum.
- Cambridge University student notebooks, 1906-1912, 8 books.
- Miscellaneous Unpublished manuscript and drawings.
- Manuscript of 'Land and freshwater mollusca', 1930s.