This image is from one of his earliest publications.
Williams, J. L. D. “Anatomical studies of the insect central nervous system: A ground‐plan of the midbrain and an introduction to the central complex in the locust, Schistocerca gregaria (Orthoptera).” Journal of Zoology 176.1 (1975): 67-86. https://zslpublications.onlinelibrary.wiley.com/doi/abs/10.1111/j.1469-7998.1975.tb03188.x (237 citations)