2451 STUDIES ON M YXOSPORIDIA —K UDO 



INTRODUCTION 



Ten years have elapsed since Auerbach (1910) published Die Cnido- 

 sporidien in which he gave a synopsis of the genera and species of Myxos- 

 poridia known up to that time. During this period new genera and a 

 number of new species have been added to the list of this particular group 

 of parasitic protozoa from the various parts of the world. It is, therefore, 

 desirable to have a complete monographic work including all the forms 

 reported up to the present time. 



The main objects of the present paper are: 1) to describe a new genus 

 and a number of new species which have come under the observation of the 

 writer; 2) to collect all the genera and species recorded by various authors; 

 3) to propose a new classification by which some of the confusion now 

 existing may, probably, be avoided; 4) to show the geographical, zoological 

 and organal distribution in the light of more recent observations; and 

 5) to present a complete list of the names of the hosts in which Myxospori- 

 dia occur. 



The writer believes himself to be in possession of as complete references 

 as possible under present conditions. However, he may be unaware of 

 some works which have not reached him owing to the war. 



The Myxosporidia recorded by Labbe (1899) are arranged in almost the 

 same order as that author listed them, with some slight change such as 

 placing the type species at the front of each genus or removing a few species 

 to other genera, while those species which have been described since 1898 

 are arranged chronologically, no matter whether names are given the 

 species or not. 



Some of the references are omitted, especially when they can be found 

 in Gurley (1894), Thelohan (1895), Labbe (1899), or Auerbach (1910). 

 The description of each species is given according to the first observer. 

 The observations of subsequent investigators are then mentioned in the 

 second place. 



Each species is described according to the following scheme: 



1) Specific name 



2) Synonyms and literature 



3) Habitat, including the locality and the date of observation 



4) Vegetative form 



5) Spore 



6) Remarks 



I wish to express my appreciation to Professor Henry B. Ward whose 

 kindness has made the completion of this paper possible. 



