116 VETERINARY PARASITOLOGY 
have been recorded by several observers. The embryos 
can usually be discovered in the blood. 
In time the heart hypertrophies. Syncope, epistaxis, 
and hematuria follow on. 
Lire-History.—This is doubtful, and the inter- 
mediate host has been supposed to be a Mollusc or 
Crustacean. 
Probably the embryos undergo development in the 
bodies of mosquitoes, migrate back to the mouth, and 
are thus transmitted ; or else the pools at which the 
dogs drink are contaminated by mosquitoes alighting 
at the edges. 
The parasite may be present in pups born to an 
infested bitch. 
Strongylus Vasorum.—This is a smaller worm, a light 
pink in colour. The male is $ inch in length, with a 
bilobed caudal pouch. 
The female is about 3 inch in length. Their habitat 
is the right heart and pulmonary artery. 
They set up endocarditis and thrombosis of the 
pulmonary artery. . 
Lafosse obtained good results by treating affected 
dogs with turpentine. 
Arsenic might be useful. 
Spiroptera Sanguinolenta.—Although this worm is 
usually an inhabitant of the first portion of the ali- 
mentary tract, it is found in Italy and China encysted 
in the wall of the aorta. The bronchial glands have 
been found to contain Spiroptera in one or two in- 
stances. 
PARASITES OF MUSCLE AND CONNECTIVE 
TISSUE. 
Spiroptera Reticulata—This worm causes  sub- 
cutaneous tumours of a fibrous nature in muscular and 
tendinous structures. 
