In the spring of 1941 a male patient died at Peterborough and the autopsy which followed showed that death was due to pontine haemorrhages. As the brain also carried a coenurus, it was submitted to me for further examination. I am much indebted to Dr. David Fulton, M.D., M.R.C.S., L.R.C.P., pathologist and physician to the Peterborough and District Memorial Hospital, and to Dr. L. P. Garrod, M.R.C.S., F.R.C.P., pathologist to St. Bartholomew's Hospital, London, through whose kindness and good offices this interesting specimen was made available to me.