206 
Sclerostomes of the Horse 
Female : 6-8 mm. in length. The body attains a maximum thickness 
of 350-450 fi near the middle. 
The vulva is 300-400/Lt from the posterior extremity of the body. 
The “tail” region appears pointed and tapers gradually behind the 
vulva, at the level of which the breadth of the body measures 140-200jn. 
The axis of the “tail” is in a straight line with that of the body (Text- 
fig. 1 c) or only very slightly bent towards the dorsal surface. The 
anus is 190-250/x from the posterior extremity. 
The vagina is very long (400-460 p.). 
The eggs measure 80-1 OOp in length and 50-60 p in breadth. 
Fig. 2. Gylichnostomum euproctus sp. n. A. Anterior end of the body in ventral view, 
X 72. B Lateral view of male bursa and genital cone, x 72. C. Terminations of 
the spicules, x 375. 
idale: 6-7'2 mm. in length, maximum thickness 350-390p. The 
bursa has a dorsal lobe of moderate length (Text-fig. 2 b) ; the most 
striking character of the species is found in the genital cone which has 
a relatively enormous length (310-400p), the dermal collar is greatly 
developed on its ventral face and the prebursal papillae are thus very 
elongated (160-220 p). The appendages of the genital cone are long, 
narrow and “cirrus” shaped (Text-fig. 2 b). 
The spicules are rather strong, their terminations are shown in 
Text-fig. 2 c. 
Cylichnostomum euproctm occupies a somewhat isolated position and 
is difficult to group with any other species of the genus. In some 
respects, e.g. in the configuration of the head, it most nearly approaches 
C. hicoronatum. 
