[Development of the trypanosomes (Trypanosoma) and cryptobians (Cryptobia) of carp and tench in the leech Piscicola geometra].

The paper presents the results of studies of the development of trypanosomes and cryptobiae of carp and tench in Piscicola geometra. The paper describes an unknown way of reproduction by means of fusion of individuals and formation of cystlike bodies, the subsequent development of which results in a special form schizogony with a formation of rosettes.