On Diplozoon nipponicum, n. sp.^^ 



by 



Seitaro Goto, Rigakushi, 



Post-graduate Student in Zoology, Imp. Univ. 



With Plates XXT— XXriI. 



Since Diplozoon paradoxum was first discovered and described by 

 V. jS[ordmann,"Mt has been made the object of special investigations 

 by many eminent naturahsts. But our knowledge of the anatomy 

 and especially the histology of this interesting genus, hitherto with 

 but a single species, is, notwithstanding the publications of Paulson, 

 Zeller, and others, by no means as complete as could be desired. I 

 have, therefore, undertaken, at the suggestion of Prof. Ijima, to 

 subject it to a renewed investigation. I at first believed that the 

 Japanese species was identical with the European ; but as I went on 

 with my work, many points came to view, that made me doubt this 

 identity ; and a close comparison with some preparations of the Euro- 

 pean species taken from Leuciscus rutilus, and brought back fr(3m 

 Germany by Prof. Ijima, has led me to erect it into a new species, 

 for which I propose the name of 



Diplozoon nipponicum. 



Before proceeding any farther, I must here discharge the 

 pleasant duty of acknowledging my deepest obligations to 



1) This paper was originally presented as a graduating dissertation. 



2) Nordmaan— Mikrographische Beiträge. I. Heft, 1832. p. 56. 



