322 
Strongylids of Horse 
My original description of the oesophageal funnel in this species was not 
quite complete and there was a small inaccuracy in my account of the worm 
which, whilst not much affecting the relationship between C. goldi and C. 
pseudo-catinatum, may have led to confusion in another direction. In my 
description of the former species the dorsal gutter was stated to be absent, 
examination of further material however shows this organ to project as a 
small tubercle on the dorsal side of the base of the mouth-capsule (Text-fig. 
3 B) 1 . 
The oesophageal funnel in C. goldi is very well developed and as shown in 
my original figure (1917, p. 210) is lined by thick chitinous walls; from the 
latter three thin plates radiate into the funnel, their triangular distal margins 
frequently projecting into the cavity of the oral capsule so as to give the ap¬ 
pearance of small teeth (Text-fig. 3 A). 
Fig. 3. Cylicostomum goldi Boulenger. Anterior extremity. A. Lateral view. B. Dorsal view. 
x 350. 
Yorke and Macfie have recently (1920) described a new species of Cyli¬ 
costomum, C. tridentatum, from W. Africa, which, except in the structure of 
the male genital appendages, seems to agree exactly with my description of 
C. goldi, as modified above. As the genital appendages of certain species 
seem capable of some variation, a careful comparison of specimens of C. tri¬ 
dentatum and C. goldi is desirable. 
16. Cylicostomum catinatum (Looss, 1900). 
C. catinatum was found on several occasions, usually in company with C. 
pseudo-catinatum. 
17. Cylicostomum pseudo-catinatum Yorke and Macfie, 1918. 
One of the commonest forms in the Punjab. The genital appendages in this 
species are liable to a certain amount of variation, individuals being met with 
1 I have to thank Dr J. W. S. Macfie for calling my attention to this error. 
