INTERNAL PARASITES OF THE DOG. 75 
at right angles to the toes. I had watched it occasionally for 
several days before I saw it protrude the two ear-like ciliated 
lappets, which probably represent the wheels. This animal offers 
many difficulties to a satisfactory classification. It appears to 
agree most with the /veurotrocha gibba of “ Pritchard,” but my 
specimens had an eye—its cilia too are differently placed, and its 
gizzard differs from the figure he gives. It is a sluggish Rotifer, 
and frequently remains for some time rolled up like a ball. 
Several times I have found them greedily devouring those gela- 
tinous masses of vibrio. What is the sarcode-like process? Is 
the animal a male? If this proves to be the fact our views as to 
the male Rotifers having no digestive organs will have to be con- 
siderably modified, as this specimen has a rather powerful-looking 
gizzard, which I was not able to study sufficiently to be able to 
give a correct description. I have now given sketches and descrip- 
tion of three species of the Rotifera, about which I shall be glad 
to obtain information, and in a subsequent issue of your journal I 
may recur to the subject, giving sketches of others, and in one or 
two instances of peculiar forms. 
INTERNAL PARASITES OF THE DOG. 
By Haroitp LEENEY, M.R.C.V.S. 
N order to clear off some of the “dust” which a correspondent 
speaks of as being thrown in the eyes of dog-owners, I propose 
now to speak of the £vzowz origin of many kinds of worms, as they 
are commonly called, and of the frobable cause of others, and by 
this means sweep away some of the accumulated rubbish with the 
besom of scientific fact, borrowed from Dr. Cobbold in great part, 
whose researches have justly gained him the first position in the 
helminthological world. 
In treating of skin diseases we have already mentioned the 
principal external parasites, many of which bear no resemblance to 
worms, and in order to approach so large a subject as parasitism, 
it is well at the outset to discard the idea of a worm being either 
long and round, or long and flat, as they vary from tiny microscopic 
objects to creatures of many feet in length, and are of all shapes 
and sizes. Neither do they all inhabit the stomach or intestines ; 
different classes find their most suitable homes in different parts of 
the body, and I think there is no one part of the animal able to 
claim exemption from the attacks of one or other of the almost 
innumerable host. There is a parasite whose delight it is to make 
