6 VETERINARY PARASITOLOGY 
Ringworm in the Ox. 
The only variety affecting cattle is a trichophytosis, 
and it rarely affects animals over one year old. The 
lesions are found in the region of the head, particularly 
round the eyes and on the neck and shoulders. They 
assume the form of more or less rounded patches of a 
silvery grey colour, ranging from r to 3 inches in diameter 
in the early stages, but later become larger by conflu- 
ence, until the whole of the head and neck may even- 
tually be left bare. The follicles are affected at the 
same time, and give rise to small pustules, which raise 
the scab, and this, if removed, leaves a raw bleeding 
surface exposed. 
Prognosis.—Except in weak undersized calves, tricho- 
phytosis is spontaneously curable, and runs its course 
usually in from one to three months. It is easily trans- 
mitted to the attendants, and produces much more 
serious lesions. Occasionally the mouths of sucking 
calves become affected, and this form is very difficult 
to treat successfully, owing to its position. 
Ringworm in the Dog and Cat. 
Both Trichophyton and Microsporon affect the dog, 
but more commonly a favus (Odspora canina). Tricho- 
phytosis appears in the form of round, sharply defined 
areas, usually of the size of a shilling, starting at the 
head, and extending to the body, particularly to the 
skin of the chest under cover of the elbows. These bald 
spots are often covered with dirty grey scales, but often 
there is no sign of inflammation. As a result of scratch- 
ing, they may become raw, and a little blood may exude. 
As they get older, the patches become lighter in colour, 
and gradually revert back to the original colour of the 
skin. 
The variety of favus attacking the dog and cat is 
known as the Achorion Quinckeanum. It affects chiefly 
