152 PARASITOLOGY. 



velopment, but upon again being placed in moist sur- 

 roundings, they will revivify and complete this phase 

 of their life cycle, providing the desiccation has not 

 been for too long a period. 



Animal Infested. — The dog. 



Part Infested.— The caecum. 



Symptoms. — They hold firmly to the mucous mem- 

 brane of the caecum and suck blood ; specimens of 

 the bowel prepared for the museum still contain the 

 worms, though dead, tightly holding on to the mu- 

 cous membrane. 



Conditions Produced. — If the animal is infested by 

 large numbers it may show a progressive anemia 

 and gradual emaciation; a derangement of digestion, 

 diarrhoea and possibly death of the host. 



Treatment. — The same as for the Uncinaria Canina. 



(Affinis — marriage) 

 Trichocephalus Affinis (Trix — hair) 



(Cephale — head) 



Synonym. — Trichuris affinis. 



Distribution. — Found in the United States and 

 Europe. 



Description. — Its body and general appearance re- 

 sembles the Trichocephalus Depressiusculus ; the 

 large part of the body of the male is tightly coiled ; 

 the body of the female is straight; the tail terminates 

 very bluntly ; the head is provided with two vesicu- 

 lar lobes; the hair-like portion contains the oesoph- 

 agus and a portion of the intestine ; the large portion 

 the intestine and reproductive organs; the male 

 measures from one to two inches, in length; the 

 female one and one-half to two and one-half inches. 

 The only difference between those of sheep and 

 those of cattle is the length. 



