ANIMAL PA RA SI TES 



41 



vesicle, about the middle of the body. From this the ejaculatory 

 duct passes to the ventral side of the tip of the tail within the 

 bursa. From this point extend the two long, threadlike spicules. 



Fir,. 16. — Head end of Ancylostoma caninum and of Necator americanus drawn to 

 the same scale. (Adapted from Looss, that of Necator reduced.) 



veniro ■ yentnal 

 .Jcrtero -ventral 



antero ■ lateral 

 medio ■ lateral 



~~.ps>stero-/afena/ 

 erterrzo- dorsal 



clot-Jal system 

 Fig. 17. — Diagram of the caudal bursa of the male Strongyloidea. (After Baylis.) 



The bursa of the male is a bell-shaped expansion of the cuticle 

 supported by thickened rays which branch in a manner charac- 

 teristic of the species. Compare carefully with the diagram 

 (Fig. 17), identifying the various systems of rays. 



Make a large drawing showing the general features above 

 described. 



