Although a considerable number of cases of tumors of the neuromyoarterial glomus has been put on record, the knowledge concerning them is still far from widely diffused in English-speaking countries, and for that reason it seems worth while to summarize the data which have accumulated about them and to record eleven new eases. It is certain that the early recognition and removal of these tumors, especially those which grow beneath the nails, may avert years of pain and misery for the unfortunate victims. Moreover, the further study of these tumors may serve to call attention to the little known but apparently important organs from which they develop and which they so faithfully reproduce on a large scale.