Correspondence and research papers (unannotated reprints of scientific discussion papers have been removed to the library otherwise publication details have been noted and indexed).

People, places and research topics discussed:

• list of specimens. Annotated
  
  
• list of Enteropneust classified by Dr CJ van der Horst, 1939
  
  
• correspondence on The Natural History Museum letterhead from AI Muir dated 5 September 1990 Dr Lambshead, providing a list of Pterobranchia held
  
  
• folder marked 'Fitzwilliam Mus Cambridge and University Museum of Zool Cambridge' containing
  
  
• folder marked 'BMNH Enteropuensta Pterobranchia, van der Horst 1939' containing