W. S. Patton and C. Strickland 
343 
found in invertebrates, and, as we now know, three Herpetomonads 
which pass a part of their life-cycles in a vertebrate, and a large number 
of trypanosomes which only live in the blood plasma of vertebrates, 
there seems no reason why the closely allied Grithidia should not be 
found also in the blood of vertebrates. Grithidia are common in blood¬ 
sucking invertebrates and we know of some that are well able to 
penetrate the ova of their hosts, so that there is no reason why they 
should not be able to penetrate red blood corpuscles. I am unable to 
follow the authors when they say that the discovery of this parasite 
supports Schaudinn’s view on the phylogenetic relations of Trypanosoma 
and Haemocytozoa. There is no evidence to show that the parasite is 
a Sporozoon. The fact that it invades the red blood corpuscles of a 
vertebrate merely indicates that it is a highly specialised flagellate; cf. the 
mammalian leucocytozoa, L. canis, L. funambuli, etc. The occurrence 
of a flagellate in the corpuscles of a vertebrate further emphasizes the 
fact that we know very little about these parasitic flagellates and 
that without a complete knowledge of all the forms and their life-cycles 
it is futile to construct hypotheses. The discovery of further stages 
in the development of this new flagellate will be awaited with great 
interest. 
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Balfour, A. (1906). Herpetomonas parasites in fleas. Journ. Hyg. vi. pp. 652- 
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-(1906). Second Report of the Wellcome Research Laboratories at Khartoum. 
Bettencourt, A. et Franca, C. (1906). Note sur l’existence du Trypanosoma cuniculi 
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Billet, A. (1904). Sur le Trypanosoma inopinatum de la grenouille verte d’Algerie 
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Bose, F. J. (1905). Recherches sur la structure et l’appareil nucleaire des Trypano¬ 
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Brumpt, E. (1904). Contribution k l’etude de 1’evolution des Hemogregarines et des 
Trypanosomes. Compt. rend. Soc. Biol. lvii. pp. 165-7. 
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Parasitology i 22 
