C. L. Boulenger 
437 
The spicules are long and slender, they end bluntly without hook-like 
terminations, they are enclosed in a finely striated sheath, very con¬ 
spicuous when the spicules are protruded (Plate XXII, fig. 5, Sp.). 
It will be seen from the above diagnosis that a serious discrepancy 
exists between it and Giles’ account with regard to the position of the 
vulva; Giles gives the distance between this opening and the anus as 
about 1 mm. whilst in the specimens examined by me it varied between 
2-3 and 3 mm. Giles, however, gives a figure of a pair of the worms 
in copula in which the position of the female genital opening is 
certainly further from the posterior extremity than is stated in the text. 
I think therefore that we may assume that his measurement was given 
in error. 
The eggs in the specimens described by me are also a little smaller 
than those recorded by Giles, this author gives the egg measurements 
as 152 x 82 p.; he does not say whether the eggs measured were taken 
from the maternal uterus or from the faeces of the host; those referred 
to in my diagnosis are all from the former source, it is a well-known 
fact that the eggs of various helminths swell considerably after being 
deposited and it is possible that the discrepancy is due to some such 
cause. 
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Boulenger, C. L. (1915). The Life-history of N e.matodirus filicollis Rud., a Nema¬ 
tode Parasite of the Sheep’s Intestine. Parasitology, vm. 133. 
Giles, G. M. (1892). On a new Sclerostome from the Large Intestine of Mules. 
Sci. Mem. of the Medical Officers of the Army of India, Part 7, 25. 
Gough, L. H. (1908). Notes on South African Parasites. Ann. Rep. South African 
Ass., Grahamstown Meeting, 1. 
Lane, C. (1914). Bursate Nematodes from the Indian Elephant. Indian Journ. 
Med. Res., n. 380. 
Lelper, R. T. (1910). Exhibition of a Series of Specimens of Entozoa. Proc. 
Zool. Soc. 1910 (1), 147. 
Linstow, 0. v. (1904). Nematoda in the Collection of the Colombo Museum. 
Spolia Zeylanica, I. Part 4, 1. 
Looss, A. (1900). Notizen zur Helminthologie Egyptens. III. Die Sclerostomen 
der Pferde und Esel in Egypten. Centralbl. f. Bakteriol. etc. Abt. i. 27, 
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-(1901). The Sclerostomidae of Horses and Donkeys in Egypt. Rec. Eqyvt. 
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