134 PARASITOLOGY. 
brane so that this acts as a portal of entry of many 
harmful bacteria. fa 
The author has recorded three cases of Sclerosto- 
mum equinum in the spermatic arteries. Two of these 
cases were from cryptorchids one from a “straight” 
colt. 
From the adult intestinal form the ova or, embryos 
pass out to the external world with the feces where 
if not already hatched they do so in a short time if 
climatic conditions are favorable. Damp or even wet 
pastures favor this intermediate stage and parasitisms 
is more prevalent in horses, asses or mules pastured 
on such grounds. Thus contaminated food and water 
serves as carriers of the infection. 
see Addenda between eae 2 ble 
STRONGYLUs VasorumM (Vas—a vessel). 
Distribution—Reported in Europe. 
Description—The worm is thread-like in calibre and 
white or pink in color; the mouth’is nude; the male is 
provided with a short, bilobate caudal pouch and two long 
spiculae; the male is two-fifths of an inch in length, the 
female one-half inch. 
Animal Infested—The dog. 
Parts Infested—The adult infests the blood-vessels, 
especially of the right side of the heart, and the pulmon- 
ary artery; the larva infests the lungs. 
Condition Produced—The ovum or embryo becomes 
lodged in the small arteries of the lungs, and it produces 
thrombosis. Its presence also causes a small granule or 
tubercle to form in the lung tissue; in the center of the 
tubercle is found the ovum or embryo, surrounded by 
epithelial, embryonic and giant cells, as found in the 
tubercles caused by the bacillus of tuberculosis, 
Symptoms.—Sudden dyspnoea, anemia, emaciation and 
oftentimes cough. Ova or embryos may be expelled by 
the fits of coughing. 
