564 SWINE IN AMERICA 



SCLEROSTOTUM DENTATUM 



"This is a small worm living in the intestines of 

 swine. The male is about 1-3 inch long; the female >^ 

 inch long; the body is of a dark color and the surface is 

 finely marked with transverse striae. It is quite slender 

 and tapering at each end, but the male has near the tail 

 a three-lobed expansion. The eggs are laid in the in- 

 testine, from which they pass out into the open air and 

 are soon hatched. The mouth of this worm is circular 

 and armed with six teeth, by means of which it attaches 

 itself to the intestine and pierces the tissue, feeding upon 

 the blood. If there are many of them they create such a 

 drain on the system of their host as to weaken and possi- 

 bly destroy it. It may also by its irritation of the bowels 

 cause serious trouble and disease. An active purge is 

 the best remedy for the removal of this worm." 



MEASLES AND TRICHINA 



By Dr. C. J. Sillier, formerly of the United 

 States Bureau of Animal Industry. — The illustrations 

 give some idea of the appearance of two muscle 

 parasites which are easily communicated to man 

 by the consumption of the uncooked flesh of infested 

 animals. They are the muscle or cysticercus and the 

 TrieJiina spiralis. Measles in the pig is the cystic form 

 of tapeworm (Taenia solium) in man. From the ear- 

 liest ages its existence in the pig was known ; but only 

 after years of experiment, and not until about the year 

 1845, was the true nature of this parasite, and its iden- 

 tity with the tapeworm in man, established. There are, 



