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C. II. MARTIN. 
the free flagella at a slightly later stage. I hope to describe 
tills process in greater detail in a forthcoming paper. 
VI. The Division of Trypanoplasma cyprini in the crop 
OF THE Leech. 
For the purpose of examining how far the various parasites 
described above approximate to the type of the true 
trypanoplasmas in the blood of fishes, it is obvious that they 
must be compared with the latter in the various stages of 
their life-cycle. Unfortunately, not much appears to be 
known of the morphology of trypanoplasmas. Keysselitz, in 
his paper, Gfenerations- und Wirtswechsel von Trypano- 
plasma borreli, Laveran et Mesnil,^’ published a long 
account of the life-cycle of a blood Trypanoplasma, but his 
figures of division, owing to the unfortunate adoption of a 
dry technique, leave much to be desired. This point has 
already been insisted on by Minchin in his paper, Some 
Observations on the Flagellates Parasitic in the Blood of 
Freshwater Fishes.^^ 
Owing to the kindness of Miss Bobertson, I recently had 
the opportunity of examining some division stages of 
Trypanoplasma cyprini in the crop of a leech. Miss 
Robertson has shown in her paper on ‘^The Transmission of 
Flagellates living in the Blood of Certain Fresh-water 
Fishes (^Phil. Trans.,^ b, vol. ccii.), that— When first 
taken into the crop of the leech, the Trypanoplasmas 
become rather broader and bulkier in appearance, and 
show a very characteristic flowing kind of motion. After 
the first few hours they are frequently to be seen in division; 
the last stage of this process is passed through with 
great rapidity. On the second day after feeding, slender 
forms, somewhat comma-shaped, appear in small numbers ; 
they are much less undulating in their movements than the 
broader forms. These two types persist side by side for 
some time, the slender forms gradually increasing in number; 
intermediate forms are also present. After some days the 
