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General Biology 



Fig. 193. Other Nematode Parasites. 



I. a., Dracunculus (filaria) medinensis (female), showing mouth and embryo. 

 b., Transverse section through adult female of I, a, showing many embryos 

 in the uterus. 



II. Cyclops. This animal is the intermediate host of Dracunculus. 



III. Trichocephalus dispar (also called Trichuris trichiura) of the Family 

 Trichinellidae. a., egg; b., female; c, male attached to the intestine, showing the 

 long, slender, cephalic end buried in the submucosa; sp., spicule. 



IV. Gigantorhynchus gigas, of the Class Acanthocephala, and Family Echinor- 

 hynchidae. A., two males and one female adult attached to the mucosa of the 

 intestine; B., eggs as seen in preparation; C, eggs as found in feces. (I, after 

 Bastian and Leuckart; II, after Riley and Johannsen; III, after Leuckart; IV, 

 after Brumpt and Perrier.) 



leaves the infected person of its own accord. Few of these have been 

 found in America. 



Trichocephalus dispar (Fig. 193), or whip-worm, is found in the 

 caecum and large intestine of man. It is 4 to 5 cm. in length, the male 

 being a trifle shorter than the female. The parasite is remarkable in 

 that there is a great differentiation between the two ends of the body. 

 The anterior end, which forms about three-fifths of the body, is very 

 thin and hair-like, while the posterior portion is thick. In the female, 



