30 
Blood Parasites 
tiypaiiosome of the thrush is larger than that of the blackbird, whilst 
the two trypanosomes met with in the thrush containing the small 
trypanosomes are smaller, and many might regard the latter as the 
intermediate variety. 
Trypanosomes of the Jay. 
Six young jays {Garridus glandarius) were shot and sent to me 
from Reading at the end of June, and by the time I examined the 
blood they had probably been dead about 18 to 20 hours. In films 
made from the blood of the heart I found large trypanosomes in five ; 
the sixth jay was so mauled that it was impossible to make clean films 
and no prolonged search was made for them in this case. Three 
contained in addition Leucocytozoa, and in two Halteridia were present 
in moderate number. 
The trypanosomes of the jay (Plate II, fig. 5) resemble the large 
fusiform variety met with in the thrush and blackbird. They stained a 
deep blue colour with Giemsa, but the nuclei, undulating membrane and 
the free flagella were very indifferently stained and in some cases invisible. 
The posterior extremity in the majorit}' of cases was blunt and round, 
only a few specimens being found with the typical finely pointed end. 
Possibly the indifferent staining of the flagella and nuclei and the 
rounded blunt posterior extremity were evidences of post-mortem 
changes. 
In many, myonemes were plainly visible. 
These parasites were not very infrequent in one bird, as I found 
17 trypanosomes in a large smear made from the heart blood. 
The measurements of a typical trypanosome were as follows: 
Total length 
49-0 IX 
Length of body 
43-0 
Length of flagellum ... 
Posterior end to middle of cen¬ 
6-0 
trosome 
10-5 
Posterior end to middle of 
nucleus 
22-0 IX 
Width of body 
8-0 
Nucleus length 
4-5 
Nucleus breadth 
3'5 
Centrosome diameter I'O /i. 
Trypanosomes of Fish. 
I have met with the following trypanosomes in fish : 
T. granulosum in the eel {Anguilla vulgaris). This is by far the most 
commonly infected fish in this locality, and I do not remember to have 
examined an eel without finding trypanosomes. Often the parasites are 
