i8 



RESEARCH IN PROTOZOOLOGY 



The infections were not very heavy, from one to one hundred 

 and ninety being found on the gills of one side. The mouth is 

 capable of great expansion. The protozoon has been observed to 

 swallow a mass of cells almost as large as itself. Wenrich states: 

 'Tt is evident that the animal is a true parasite, living at the ex- 

 pense of its host." 



Description: Average size 51.5^ x 122^; lives in membranous capsules 

 on the gills of tadpoles ; feeds on the tissues of its host. 



A. claparedei Stein has been reported from the skin of tad- 

 poles and from the pedicles of Epistylis. A. carchesi Stein lives 

 on the pedicles of various vorticellids. Individuals of these two 

 species will ingest a vorticellid and then encyst on the stalk to digest 

 the meal. 



Fig. 4. — Amphileptus hranchiarum, A, free-swimming specimen showing 

 many vacuoles and two nuclei in outline. B, specimen in membranous capsule 

 on gill of tadpole. C, section of specimen biting off a group of epithelial cells 

 from the gill of tadpole, X 450. (After Wenrich.) 



(b) Chilodon cyprini Morofif. 



Morofif (1902) found a ciliate parasitic on the embryos and on 

 the skin of young fish, especially carp, and named it C. cyprini. 

 Apparently this ciliate does not live on healthy fish but attacks 



