RESEARCHES IN HELMINTHOI^OGV AND PARASITOLOGY. 13I 



by a five-lobed disk and a pair of claws, as represented in figure 3. 

 The palpi are six-jointed, as represented in figure i . The mandibles 

 end in pincers or chelae, resembling lobster claws, as represented in 

 figure 2. The movable joint of the chelae has two teeth at the end. 

 The opposed extremity of the fixed joint of the chelae is narrow, 

 and ends in a hook. (Drawing.) 



Whether this mite is a true parasite of the ear of the living ox, or 

 whether it obtained access to the position in which it was after the 

 death of the ox in the slaughter-house, has not yet been determined. 

 Dr. Turnbull observed it only in the position indicated. 



[June, 1872. No 365. See Bibliography.] 



Note oil Gamasus of the Ox. — Prof. Leidy read an extract from a 

 letter from Dr. C. S. Turnbull, in which it was stated that the writer 

 had been misunderstood in relation to the acarusof the ox, described 

 in the Proceedings for January 2d. He had seen the cattle killed, 

 and was positive that the mites occupied the position in the ear of 

 the steers while these were alive. Such being the case, the acarus 

 may be viewed as a parasite of the ox, and may be specifically named 

 Gainasits auris. 



[April, 1873. No. 389. See Bibliography.] 



FiDigiis Parasite 0)1 a Mouse. — Prof. Leidy exhibited a mouse with 

 several whitish masses adherent to the ears, side of the face, and 

 nose. The mouse had been caught in the children's department of 

 Blockley Hospital, and was submitted to his examination by one of 

 the attending physicians. Dr. James B. Walker, who had informed 

 him that he had observed a number of mice in the same condition. 

 Dr. Walker had previously informed him of the curious affection of 

 the mice, and it w^as at his suggestion that the present specimen was 

 caught for examination. The white matter, examined beneath the 

 microscope, proved to be composed of sporular bodies, single, double, 

 or in short chains of a dozen or more. They measure about the 

 I -650th of a line in diameter. The fungus is a Torida or Oidiiim, 

 and resembles that found in Aptlia. Perhaps the disease in the mice 

 is the result of feeding upon articles imbued with adherent portions 

 of apthous matter from the mouths of children, and perhaps also 

 the latter may become affected from diseased mice contaminating 

 food or drink used by the children. 



