PARASITOLOGY. 153 
Animals Intested.—The ox, sheep, and goat. 
‘ : Parts Infested. —The colon and 
4 ‘a caecum. 
Condition Produced. — The em- 
2 bryos, upon being taken into the 
digestive tract of the host, have 
a been observed to reach maturity 
Ser 4 in two to three weeks; they hold 
&. = 
TrichocerHatus Arrinis Htmly to the mucous membrane 
Sheep and suck blood; only a few have 
1, Female . ff é 
2, Male. been noted in infested animals 
a, Cephalic extremity. and no serious results have been 
b, Caudal extremity. é y 
reported in this country. 
TRICHOCEPHALUS CRENATUS (Crena—notch). 
Synonyms.—Whip worm; Trichocephalus Dispar. 
Distribution. — Occasionally found in the United 
States. 
Description.—In shape and appearance the male and 
female resemble the Trichocephalus Affinis of sheep; 
the male-measures one to one and one-quarter inches 
long, the female one and one-half inches. 
Animals Intested.—The pig. 
Parts Intested.—The small intestines. 
Conditions Produced. —'They are found firmly 
attached to the mucous membrane. When only a 
few are present no serious results occur; when myr- 
jads are present they cause diarrhoea, indigestion and 
an unthrifty condition. 
TRICHINA SPIRALIS (Trix—hair; spira—coil). 
Synonym.—Trichonella spiratis. 
Distributton—Common in United States and many 
European countries. Trichina was first discovered 
by Peacock in 1828,in England. Found in about one 
