27 
SOLEROSTOMES OF THE DONKEY TN ZANZIBAR 
AND EAST AFRICA. 
By CHARLES L. BOULENGER, M.A., D.Sc., 
Reader in Helminthology, University of Birmingham. 
(From the Research Laboratory in Agricultural Zoology , 
University of Birmingham.) 
(With 5 Text-figures.) 
INTRODUCTION. 
During the last few years our knowledge of the Sclerostome parasites of the 
horse has been greatly augmented, the nematodes of the donkey have not 
however received attention since 1901, the date of publication of Looss’ 
famous monograph on the Sclerostomes of the Equidae. 
I have recently received for study two collections of helminths from 
domestic animals, each of which includes a number of nematodes from the 
donkey; for the first of these I am indebted to Mr W. M. Aders, Economic 
Biologist of the Zanzibar Government, the second collection was kindly en¬ 
trusted to me by Professor G. H. F. Nuttall, F.R.S., who had received it from 
Mr R. Eustace Montgomery of the Veterinary Pathological Laboratory, 
Nairobi. 
Some of the material from the latter source reached me in a poor state of 
preservation and it was not possible to identify all the forms present, alto¬ 
gether however nine species were observed, including two hitherto unde¬ 
scribed: 
1. Strongylus vulgaris (Looss). 
2. Strongylus edentatus (Looss). 
3. Strongylus asini sp. n. 
4. T riodontophorus intermedius Sweet. 
5. Cylicostomum auriculatum (Looss). 
6. Cylicostomum coronatum (Looss). 
7. Cylicostomum bicoronatum (Looss). 
8. Cylicostomum alveatum (Looss). 
9. Cylicostomum adersi sp. n. 
The worms numbered 1-3 occurred in both collections, 4-8 were from 
East Africa, whilst No. 9 was from Zanzibar only. 
Since the publication of Looss’ monograph a number of new species have 
been referred to the genera Triodontophorus, Gyalocephalus and Cylicostomum, 
