|If you look closely at this photograph you can see that the Marine Biological Aquariums are being constructed on land donated by the War Department below the Citadel. That likely dates this photograph to the 1880s.
Below shows the personnel who officially opened the MBA laboratory on Citadel Hill, Plymouth, on 30 June 1888. Image courtesy of Marine Biology Association
The bottom picture shows it after construction.
Empire in Your Backyard: Plymouth Article
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