ON SOME NEMATODE PARASITES OF THE ZEBRA. 
By CHARLES L. BOULENGER, M.A., D.Sc. 
(Reader in Helminthology, University of Birmingham.) 
(With 7 Text-figures.) 
CONTENTS. 
Introduction ..... 
Cylindroph art)nx brevicauda Leiper 
„ longicauda Leiper 
Cylic.ostomvm zebrae sp. n. . 
„ Montgomeryi sp. n. 
Craterostomum tenuicauda. gen. et sp. nn. 
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INTRODUCTION. 
Having during the last few years been particularly interested in the Nematode 
parasites of horses and donkeys I was very pleased to find a tube containing 
Strongyles from the zebra among some material recently forw arded to me by 
Professor G. H. F. Nuttall, F.R.S. These worms formed part of a collection of 
Helminths from Nairobi, British East Africa, which had been sent for identi¬ 
fication by Mr R. Eustace Montgomery, Director of the Nairobi Veterinary 
Pathological Laboratory. 
The specimens were in a good state of preservation and, although not 
numerous, they included representatives of eight species, three hitherto 
undescribed, one of which is taken as the type of a new genus. The specific 
identity of the host was unfortunately not ascertained, the worms being 
labelled “Zebra, R. Ruaraka.” 
As pointed out by Leiper (1911), the Nematodes parasitic in the zebra 
consist of a number of species occurring in the domestic equines as well as 
others peculiar to itself, of the latter among the bursate forms perhaps the 
most interesting are those included by that authority in the genus Cylindro- 
pharynx. Both the known species of this genus are to be found in Mr Mont¬ 
gomery’s collection, and, whilst describing some new forms of Cylicostominae 
in this paper, I take the opportunity of somewhat amplifying Leiper’s 
descriptions of these species. 
The worms from the Nairobi material have been identified as follovs. 
1. Strongylus vulgaris (Looss, 1900). 
2. Cylindropharynx brevicauda Leiper, 1911. 
3. „ longicauda Leiper, 1911. 
