154 WORMS INFESTING THE DOG. 



they are derived, and these are the points of special interest to the 

 courser. 



THE DEVELOPMENT of the tape and round-worms is altogether 

 different, and each must be studied by itself to enable us to take 

 proper precautions against their invasion of the intestines of our 

 dogs. With regard to the maw-worm, although I can find no spe- 

 cial description, either of the worm itself or of its development, 

 in Von Siebold or Kuchenmeister, nor do I find it mentioned 

 among the parasites infesting the dog enumerated by the latest 

 French authority (M. C. Davaine), yet there is no doubt that it is 

 a thread-worm (Oxyuris of Kuchenmeister and Davaine), and its 

 natural history similar to that given by these writers in treating 

 of this worm in man, the horse, and other animals. This is a 

 curious omission, as the thread-worm is found in the dog much 

 more commonly than any other species of worm, and also more 

 frequently in him than in any other animal, as far as I know. 

 From its pure white colour it is often confounded with the tape- 

 worm by careless observers, but this could scarcely have happened 

 to the German writers I have quoted, nor, indeed, to any scientific 

 enquirer. The omission is a remarkable one, and I am entirely 

 at a loss to account for it. 



The TAPE-WORMS ordinarily infesting the dog are the Tcenia 

 serrata, which so closely resembles the Tcenia solium of man 

 that Siebold declares the two to be identical, and the Tcenia 

 cucumerina, which can readily be distinguished. Besides these 

 two, admitted by all authorities, Siebold describes a species of 

 Bothriocephalus as having been found in a Pomeranian dog, and 



