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In the June Number of Muller’s Archiv (for 1842) there appeared a paper from the pen of Dr. Simon of Berlin, announcing the discovery of certain animalcules, which he regarded as Acari, in the sebaceous substance of the follicles of the human skin. After perusing his account of these singular creatures I was induced to engage in the inquiry, and was so much interested in what I saw, that I devoted six months of exclusive labour to the study of their structure and mode of development. The result of my research is at variance with the description of their structure given by Dr. Simon; it corroborates Dr. Simon only in the general fact of the existence of these animals and their diversity of form, while it offers several new and original observations for consideration. Among the latter I may refer especially to the anatomy of the head, which Dr. Simon regards as composed of certain moveable organs, but which in reality is distinct from those organs; the discovery of eyes; of a power of retracting the head within the thorax; of ova; of a remarkable embryonic form; and of the progressive development of the young animal. The situation of the animalcule in the zoological system is a question still to be determined, and it is one on which I have felt unwilling to speculate until a complete description of the creature shall have been placed before scientific entomologists. The name given to the animal by Dr. Erichson of Berlin and adopted by Dr. Simon, namelyAcarus folliculorum , is founded on the erroneous view of the anatomy of the head and mouth, put forth by the latter gentleman. The animal is not anAcarus , for it has no haustellum; nor is it an Arachnidan, for it possesses a distinct head, susceptible of retraction within the thorax, and an abdomen most indubitably annelidous in structure. Under these circumstances I have followed, in the present paper, the suggestion of Dr. Todd, and have made use of the term Entozoon, signifying merely an inhabitant of the interior of the body, as a temporary appellation, until a better and more suitable one shall have been invented.

XI. Researches into the structure and development of a newly discovered parasitic animalcule of the human skin—the entozoon folliculorum