14 BULLETIN OF THE 
One finds it impossible to place any confidence in Wilgon’s account of 
the excessive complication of structure of the parasite. He describes 
the head as furnished with a pair of eyes, palpi, labrum (1), eight pairs 
of tentacles, and four to ten pairs of maxilla! He is disposed to remove 
the creature altogether from the Arachnida and put it in close relation 
with the Annelides or the lower Crustacea, Waiving the question of its 
exact systematic position, he gives it a provisional name, Entozoon folli- 
culorum.* The first notice of the presence of Demodex in other animals 
than man was a communication read by Mr. Tulk before the Micro- 
scopical Society of London, December 20, 1843.4 He obtained speci- 
mens from Mr. Topping, a preparer of microscopic objects, who found 
them in the contents of pustules on a mangy dog. The parasites were 
very abundant, sometimes thirty or forty in a single drop of pus. The 
dog was spoken of as “a perfect mass of disease." 
In 1844 the animal received a name for the fifth time, when Gervais, 
translating a part of Dr. Simon’s paper for the “ Histoire Naturelle des 
Aptéres" proposed the name Simonea folliculorum.t 
The next observer to turn his attention to this subject was Gruby,§ 
who found the Demodex in men and dogs, causing in the latter a serious 
mangy affection of the skin. He noticed that the parasites spread in 
a circle from follicle to follicle, and believed that the human and canine 
forms were the same species, and capable of transmission from one host 
to the other. 
In 1845 Dr. Gros announced the discovery of Demodex in the snout 
of the dog, fox, horse, ox, eto. || 
At a meeting of the * Freunde der Naturwissenschaften " in Vienna, 
March 26, 1847, Dr. Carl Wedl presented a paper on the anatomy and 
development of Demodex. €T 
Küchenmeister, in his work on the parasites of the human body, 1855, 
London, 1844, Pt, T. pp. 305-319, Pl, XV. - XVII. (Read Mar. 30, 1843. Abstract in 
Ann. and Mag. Nat. Hist. XII. p. 222, 1843, and in Proc. Royal Soc. V. p. 495, 1843 = 44.) 
* In his “Diseases of the Skin,” 2d ed., 1847, Wilson gives the parasite a new generic 
name, Steatozoon. 
+ An abstract of this communication is given in “The Annals and Magazine of Natural 
History," XIII. p. 75, 1844. 
t Hist. Nat des Insectes, Aptéres, III. pp. 153, 282, 1844. 
$ “Recherches sur les animalcules parasites des follicules sébacés et des follicules des 
poils de la peau de l'homme et du chien." Comptes Rendus hebdomadaires des Séances 
de l'Académie des Sciences, XX. pp. 569-572, 1845. 
|| Bulletin de la Société Impériale des Naturalistes de Moscou, XVIII, p. 415, 1845. 
T “Ueber die Haarsackmilbe (Acarus folliculorum).” Haidinger's “Berichte.” Bd. 
il. pp. 272-277, 1847. 
