50 HELMINTHOLOGY 



d. Notice the long slender spicules of the males. Are they of 

 equal length or not, and how many are there? 

 Draw male and female specimens. 



C. Necator (Uncinaria) americana is the American hook- 

 worm of man. 



a. How does it compare with the above species in form and 

 size? 



b. Is the buccal capsule as large as the above? 



c. Compare the form and arrangement of the teeth with the 

 above. 



Draw a specimen, showing only the anterior end with buccal 

 cavity and teeth. 



D. Strongylus edentatus is the blood-sucking strongylid of 

 the horse. Examine specimens of this or the related species, 

 Strongylus (Sclerostoma) armatus. 



a. Strongylus edentatus is called the "Toothless Strongylid." 

 Are there no teeth in the buccal cavity? 



b. Examine specimens of both males and femafes and com- 

 pare these with human hookworms as to size, form and other 

 characters. 



Draw a specimen to show general outline. 



EXERCISE 27 



OTHER HOOKWORMS 



A. Monodontus phlebotomus is commonly called the hookworm 

 of cattle, and is the probable cause of salt sickness. Exam- 

 ine mounted specimens and make the following determina- 

 tions: 



a. What Strongylid characters do these worms possess? 



b. Examine the large buccal capsule, "provided at its base 

 with a strong dorsal tooth projecting into its cavity, and with 

 four ventral teeth or lancets." (Ransom.) 



