17 
BLOOD PARASITES FOUND IN MAMMALS, 
BIRDS AND FISHES IN ENGLAND. 
By ALFRED C. COLES, 
M.D., D Sc. Edin., M.R.C.R Lond., F.R.S. Edin. 
Bournemouth. 
(With Plates II-V.) 
During an investigation, extending over several years, of the blood 
of numerous animals found locally, I have met with numerous parasites 
most of which are well known, but some, at least to me, are new. 
Among the latter were especially the following : 
1. Immature forms of Trypanosoma vesper'tilioms in Vesperugo 
pipistrellus. 
2. Possible schizogonic forms of the Leucocytozoon of the thrush, 
found in the peripheral and heart blood and in that from the lung. 
3. Haeniogregarina in the blood of the field mouse and field vole. 
4. Intracorpuscular bodies of the nature of Piroplasma in the 
blood of the field mouse and water vole. 
~>. Spirochaeta in the blood of two species of bats, the Pipistrelle and 
the Noctule. 
6. Toxoplasma and Haeniogregarina i\\ blood and organs of the 
squirrel. 
It is quite impossible for me with such limited literature at my 
disposal to determine whether any of these repi’esent new species, but 
I have given a brief description and have added photomicrographs of 
each so that they may be identified. 
It is customary to decry the mere hunt for, and the adding of names 
to, new parasites, and although I would to some extent plead guilty to 
this indictment, my investigations were primarily undertaken to try and 
Parasitology vii 2 
