182 PARASITOLOGY. 
TAENIA OVIS. 
Il’here Found—Frequent in western part of the United 
States. 
Descriptionn—Adult worm 12 to 36 inches long. The ter- 
minal segments are usually longer than broad. The head 
is provided with 4 oval suckers and a rostellum of from 24 
to 36 hooklets. 
Life History.—Similar to that of the Taenia Marginata 
except that the cystic form develops in the musculature, 
both skeletal and heart. The cystic stage is -called the 
Cysticercus ovis. The cysts are oval in shape and average 
about one-fourth inch in diameter. Each cyst contains one 
head. 
Animal Infested—Adult stage, intestines of the dog. 
Cystic or larval stage the musculature of the sheep. 
TAPEWORMS OF DOG. 
The tapeworms commonly found in the dog are 
armed; their life history is known. 
TaAENIA MarGInaTA (Marginatus—margined).*' ’ 
Synonym.—Marginate tapeworm, .Taenia Hydati- 
gena. 
Distribution.—One of the common aceon of 
the dog; the shepherd dogs are a common carrier of 
the worm. Description.—The head is scarce: 
£ (J ly wider than the neck and is pro- 
A vided with four sucker discs. be- 
t.veen which is located arostellum 
of hooklets; this frostellum is 
arranged in a double circular form 
and consists of from thirty to forty 
-hooklets. The neck is short; the 
segments as they develop from 
the neck are shorter than broad. 
le, As the distance from the head 
TAENIA MARGINATA. grows greater the segments be- 
“a Shi come wider and longer; the mature 
c, Genital pore, segments are nearly square; the 
Cp RAB GRREME RIES ripe segments are slightly longer 
