320 
Strongylids of Horse 
In the specimen before me the dorsal gutter is well developed and most 
conspicuous (Text-fig. 2 A), it extends more than half-way along the dorsal 
wall of the oral capsule. Both Ihle and Yorke and Macfie describe this organ 
as present in P. imparidentatum, Turner however definitely states that the 
dorsal gutter is absent and her figure of the dorsal view of the mouth-capsule 
e.l.c. 
Fig. 2. Poteriostomum imparidentatum Quiel. Anterior extremity. A. Dorsal view. B. Lateral 
view, x 200. 
(p. 446, fig. 1) shows no trace of it. If this is not due to some error of observa¬ 
tion the specimens described by this author from the zebra must be considered 
as belonging to a distinct species. 
The oesophagus has a length of 0-7 mm., the oesophageal funnel is strongly 
developed. The cervical papillae and the excretory pore are at approximately 
the same level, 0*55 mm. from the anterior extremity of the body. 
