On the Lampreys of Japan together with Notes 

 on a Specimen of Lamprey from Siberia. 



BY 



S. Hatla. 



For some years past, I have been engaged in collecting materials 

 for the study of the species of Petromyzon which occur in Japan, and of 

 their distribution. The present notes embody the results so far obtained, 

 and while not yet complete, will, it is hoped, prove of some interest. In 

 addition to this, I append at the end a brief notice on a specimen from 

 Siberia. 



The materials employed in the present investigation are (a) the 

 specimens in the Zoological Institute of the Science College, (b) the 

 specimens in the Imperial Museum, 1 ) and (c) those in my own possession 

 partly collected by myself at several localities in the year 1891 — 1899, 

 and partly collected and sent to me by the undernamed gentlemen in 

 various parts of the country, 2 ) to whom my best thanks are due : — - 



Prof. A. Oka, Mr. S. Honda, Mr. S. Fujishima, Mr. J. Nakanishi, 

 Mr. T. Yubuki, Mr. T. Yasuye, Mr. K. Andò, Mr. N. Takahashi, 

 Mr. K. Okamura, Mr, S. Morohashi, Mr. T. Kitahara, Mr. T. Awoyama, 

 Prof. J. Hara, Mr. T. Nozawa, Mr. T. Yamanaka, Mr. M. Yamaoka, 

 Mr. Y. Yanagisawa, &c 



1) For the free access of these collections I am indebted to Prof. Mitsdkuri, the 

 Director of the Institute, and Prof. Ishtkawa, the Director of the Natural History 

 Department of the Museum. 



2) I am also indebted to the undermentioned gentlemen, from whom I received 

 the important informations on Lampreys : — 



Mr. S. Onishi, Mr. K. Fdrusawa, Mr. S. Honda, Mr. Y. Nakamüra, Mr. Y. Nawa, Mr. 

 K. Niwa, Mr. K. Kato, Mr. H. Kato. Mr. T. Hata, Mr. T. Nozaki, Mr. T. Oqasawara, 

 Mr. K. Ogura, Mr. T. Ito. Mr. Y. Watanabe, Mr. T. Takeshita, Mr. S. Hattort, Mr. 

 S. Kajita, Mr. K. Ishikawa, Mr. K. Fcjiwara, Mr. M. Sanetoshi, Mr. X. Hayashida, 

 Mr. T. Yamanodtchi, &c. 



