54 
C. H. MARTIN AND MURIEL ROBERTSON. 
which the most hazardous speculations can be put forward, 
and these, unfortunately, crystallise only too soon into the 
well-known protozoon life-cycles of the zoological text-book . 1 
Although we do not feel justified in putting forward a 
complete life-cycle in the case of any of the forms described 
Text-pig. 1. 
Chilomastix gallinarum, showing the four free flagella, 
hlepharoplast, well- developed pharynx, and nucleus. 
Abbreviations. — Ax. Axostyle. Bl. Blepliaroplast. b.g. Basal 
granules. Chr. B. Chromatic blocks. Chr. L. Chromatic line. Cyt. 
Cytostome. F. Free flagellum. Ka. Karyosome. M.F. Membrane 
flagellum. Nu. Nucleus. Ph. Pharynx. 
1 In this the first part of our paper we only deal with the morphology 
of the flagellate parasites we have found. In the second part we give 
an account of the other animal parasites and of the results obtained 
from new infections. 
