PARASITOLOGY. 91 
from one-half to three-fourths of an inch in length. 
The tail of the male is coiled in a spiral 
manner. This extremity is provided with 4, 
two unequal spiculae and five anal papillae. > 
The tail of the female is straight and ob- rig. 31--Ser- 
tuse; the vulva is situated near the ante- eo 
rior third of the body; the female is ovo- a,Male. 
viviparous. The head is provided with » Female. 
four thick lips. 
Animal Infested.—The horse. 
Parts Intested— Condition Produced.—The worms are 
found in the stomach of the horse, where they cause 
tumors; the larvae find their way into the ducts of 
the gastric glands, where by their presence they pro- 
duce sub-mucous tumors; these tumors develop until 
they are as large as pigeon’s eggs and round or oval 
in shape, and the cavity of the tumor may contain 
dozens of the worms; an opening communicates 
with.the interior of the stomach. The color of the 
mucous membrane over the tumor does not differ 
from that of the remainder of the mucous surface. 
Injury to Host.—When found usually only one or 
two tumors are present, and no serious disturbance 
_~ has been noted. 
_Sprroprer« Microstoma (Micro—small; stoma—mouth). 
Distribution.—Found frequently in the 
United States and in Europe. 
af 4  Description.—In shape and color this 
worm resembles the preceding one. The 
Fig. 32-Sri- male is about one-half inch long, the fe- 
MicRosToMa. male three-fourths. The tail of the male 
b eae ale. is coiled in a spiral manner; the tail of 
