PARASITOLOGY. Q7 
The male is six to seven inches long; the female 
eight to ten; the tail of the female is straight; she 
is ovoviviparous. Life C yele-—The mosquito is 
known to be an intermediate host; in the intestinal 
tract of this insect the minute embryo finds its way 
up the Malpighian tubes and there passes through 
a non-motile stage into the larva. Later the larva 
becomes motile and migrates through the tissue to the 
head and enters the proboscis; thus the dog is inocu- 
lated with the larval form at the time the mosquito 
punctures the skin. Animal Infested—The dog. 
Parts Infested —Right side of the heart and the pul- 
monary artery. 
Injury to Host.—Perhaps the first symptom noticed 
will be dullness, followed by debility and dropsy ; 
the dog is seized with convulsions, which become 
more severe as the worms become more numerous ; 
vomiting has been noted: the patient usually dies in 
convulsions. 
Post Mortem Findings.—In some cases hundreds 
of worms may be found in the right side of the heart 
and in the pulmonary artery; in other instances a 
lesser number. Sometimes the worms are found 
wound in amass obstructing the passage of blood 
and causing an endocarditis and endarteritis. 
ASCARIDAE. 
The family Ascaridae are commonly called Lum- 
bricoids because they resemble the earth worms in 
shape and color. They include a group of worms 
the bodies of which are much larger in calibre than 
the preceding family. The head parts are provided 
with three lips, and in most species stand out promi- 
nently, being marked by a constriction posteriorly. 
Species of this family infest the intestines of all 
