238 



PARASITES OF THE DOMESTIC ANIMALS 



female is situated toward the anterior quarter of the body. The tail 

 is obtuse. 



Length of female, 9-14 cm. (3 1/2-5 1/2 inches) ; male, 5-10 cm. (2-4 

 inches). 



Eggs globular, 75-80 microns in diameter. 



Infests the small intestine. 



Fig. 123. — Belascaris marginata: 

 male; C, female, natural size. 



A, head, enlarged; B, 



Toxascaris limbata (Toxascaris marginata). Ascaridse (p. 229). — 

 The body is firm and whitish or pale red in color. The cephalic wings 

 are long, narrow, and somewhat lanceolate. The spicules of the male 

 are not quite equal. 



Length of female, 6.5-10 cm. (2 1/2-4 inches) ; male, 4-6 cm. (1 1/2- 

 2 3/8 inches). 



The eggs are 75 to 85 microns in diameter. 



Parasitic in the intestines of the dog. 



Occurrence in the Dog. — Belascaris marginata is most often found 

 in young dogs of three to four months. It is probable that about thirty 

 per cent, of all puppies harbor the worms in more or less numbers in 



