C. L. Boulenger 
321 
In the structure of the male bursa the Punjab specimen agrees with those 
described by previous authors. As pointed out by Yorke and Macfie the 
arrangement of the bursal rays forms the strongest argument in favour of the 
separation of this worm from Cylicostomum. 
Genus Cylicostomum Railliet and Henry, 1902. 
(Cylichnostomum Looss, 1902.) 
9. Cylicostomum coronatum (Looss, 1900). 
A very common parasite in the Punjab, found on numerous occasions in 
horses from various sources, sometimes in considerable numbers. 
10. Cylicostomum labiatum (Looss, 1902). 
This species was also obtained on several occasions, usually however in 
small numbers. 
11. Cylicostomum poculatum (Looss, 1900). 
Found twice in horses from the Sargodha Depot. 
12. Cylicostomum longibursatum Yorke and Macfie, 1918. 
( C. calicatiforme Kotlan, 1919. C. nanum Ihle, 1919.) 
13. Cylicostomum minutum Yorke and Macfie, 1918. 
( C . catinatum var. minus Kotlan, 1920.) 
14. Cylicostomum calicatum (Looss, 1900). 
Species 12-14 were obtained on several occasions from material sent by 
Capt. Stewart from Sargodha. 
15. Cylicostomum goldi (Boulenger, 1917). 
This species was described by me from horses in England in 1917, it has 
since been recorded from the same host in Holland (Ihle, 1920 a) and in Canada 
(Ransom and Hadwen, 1918). Miss Turner (1920) tentatively refers to C. goldi 
a single female specimen obtained from a Chapman’s zebra in the London 
Zoological Gardens, at the same time suggesting that this species and C. pseudo- 
catinatum Yorke and Macfie, 1918, may prove to be identical. 
It is difficult to understand how the two forms can be confused, they of 
course belong to the same group of species, the alveatum-catinatum group (cf. 
Ihle, 1920 b ) the members of which have a number of characters in common, 
but differ from one another in several important features, particularly in the 
structure of the oral capsule the walls of which converge from before back¬ 
wards in C. pseudo-catinatum and diverge in C. goldi. Another important 
difference between the two species is to be found in the character of the caudal 
region of the female which is bent dorsally to a much greater extent in C. 
pseudo-catinatum than in C. goldi. 
The Punjab specimens of C. goldi are a little larger than those observed by 
me in England, the females reaching a maximum length of 7-8 mm. 
