There is an attempt at, but no true, clonus; that is, passive flexion of the foot causes two or three jerky movements.
"Anomalies and Curiosities of Medicine" by George M. Gould
Both deep and superficial reflexes exaggerated; ankle clonus both sides; hyperaesthesia of abdomen and face.
"Studies in Forensic Psychiatry" by Bernard Glueck
Quite analogous to this is the ankle-clonus.
"A System of Practical Medicine by American Authors, Vol. I" by Various
Knee jerks were very active, almost a clonus.
"Barium, A Cause of the Loco-Weed Disease" by Albert Cornelius Crawford