EIGHTH ANNUAL REPORT. 



131 



other meat- and fish-eating animals, are due, in the great majority 

 of cases, to the irritation produced by intestinal parasites. 



Following is a list of parasites most commonly met with among 

 our animals, nearly all of which are amenable to treatment : 



Ascaris mystax (Zeder). — Female measures 5 cm. to 10 cm. 

 long ; male, 4 cm. to 6 cm. This species is very commonly found 

 in the Felidse generally — tigers, lion cubs, ocelots, martens and 

 badgers. Its distinguishing features are well shown in the ac- 

 companying cut. 



Ascaris marginata (Rudolphi). — This worm is white, or slight- 

 ly reddish ; head is curled, and has three lips with papilla on each. 



CEPHALIC EXTREMITY, 

 MAGNIFIED. 



FEMALE, NATURAL SIZE. 



ASCARIS MYSTAX (RAILLIET). 



Female, 8 cm. to 14 cm. in length ; tail obtuse. Male, 5 cm. to 

 10 cm. long; tail is curled, and possessing two small membranous 

 lateral wings. They have been found in tigers, leopards, coyotes, 

 wolves and foxes. 



Ascaris megalocephala, of the horse, has been found in bears, 

 wolves, and zebras. Male, 12 mm. to 18 mm. long; female con- 

 siderably longer. A female worm obtained from a zebra meas- 

 ured 14^ inches after being in formalin for more than a week. 

 The presence of these worms does not usually affect the health of 

 their host, although in young animals they might give rise to 

 various digestive disorders. 



Ascaris lumbricoides. — Female, 12 mm. to 24 mm. in length, 

 and about 5 to 7 mm. in diameter ; the male is considerably smaller. 



This common parasite of the human intestine has been found 



