In 1916 I1 reported several cases of a disorder occurring in one family, which seemed to me to belong to the group known as pseudosclerosis, probably a family form of a lesion of the lenticular nucleus, and in that paper I grouped the various disorders attributed to disease of the lenticular nucleus. These were the pseudosclerosis of Westphal and Strümpell, Huntington's chorea, Parkinson's disease, spastic pseudobulbar palsy with contractures and choreo-athetoid movemeünts of Oppenheim and Vogt, and Freund and Vogt, Oppenheim's dystonia musculorum deformans, and double athetosis. To this list I added von Bechterew's hemitonia apoplectica and certain forms of carbon monoxid poisoning, and I am inclined to add a certain form of paramyoclonus multiplex resulting from lethargic encephalitis. To the list might also be added arteriosclerotic muscular rigidity and certain forms of senile dementia, which Strümpell thinks belong to his amyostatic syndrome. He refers to a paper on