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. 4 
Animal Infested.—The dog. @ a7 
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.—lf 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.—tTrichuris 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 anda 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. 
