The specimen of the larva of H. canicalaris was obtained from the stool of an adult man, who gave the following history:

He had been in good health and had not been conscious of any intestinal disorder. On the morning of the 28th of May he happened to look down into the pan of the closet after passing a motion and noticed that there was considerable movement taking place in the motion, which was partially formed. This movement was due to the presence of a large number of larvae, several of which crawled up the edge of the pan. He secured one and brought it to me in a bottle, and it was then alive and moving vigorously about the bottle. It maintained its vitality so long as it was in my possession, and until it was despatched to Cambridge for identification.