PARASITOLOGY. 119 
Condition Produced.—It becomes lodged in the mu- 
cous membrane of the abomasum and intestines, 
more commonly in the former location. Upon ex- 
amination of the infested tissue small nodules, the 
size of a pinhead or millet seed, will be observed. 
These nodules may be slightly depressed in the cen- 
ter. If this membrane be placed in a compressor 
glass it will be found to contain the larva or adult 
worm. 
Symptoms.—The symptoms are the same as those 
produced by the Strongylus Contortus. 
Treatment.—The same as for the Strongylus Con- 
tortus. 
STRONGYLES OF THE HORSE, 
THE STRONGYLUS-ARMATUS GROUP. 
In the group of parasites commonly known under 
the name of Strongylus armatus will be discussed the 
following genera: Sclerostomum and _ Triodonto- 
phorus. 
GENUS SCLEROSTOMUM. 
The mouth-collar is formed by a continuation of 
the skin and at its upper part is split into a 
delicate fringe-like crown. See figure 1, 4 and 6, 
Plate 9, and 9 in Plate 9. The inner part of 
this mouth-collar rests on the anterior border of the 
mouth-capsule. The skin is thick. The head is pro- 
vided with papillae and the four sub-median are 
marked by a short point composed of the chitinous 
substance of the mouth-collar and projecting at the 
base of the anterior leaf-crown. The ‘fibers of the 
papillary nerves terminate immediately beneath them. 
The lateral papillae are not provided with these points 
