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The chelonian brain is not too small to be studied macroscopically. It is easily removed from the skull. Minute surface details and the cell structure can be easily observed.
Munson, J. P. (1913). Chelonian brain-membranes, brain-bladder, metapore and metaplexus. The Anatomical Record, 7(5), 169–181. https://doi.org/10.1002/ar.1090070503