S. H ATT A. 



29 



My friend Mr. Uyeda in Nikulaevsk informed that there are found 

 Lampreys abundantly which much resemble the larger Lamprey of 

 Japan ; these may be of the same species as Lampetra camtschatica 

 (Pallas) or L. aurea (Bean). 



Thus together with Lampetra camtschatica which is the same or at 

 least very close to Lampetra japonica of Japan, the present species is 

 represented on the Japanese Island. I do not hesitate in concluding, 

 therefere, that the coasts round the Okhotsk Sea and the Japau Sea 

 show, with regards the Lamprey fauna, a uniform character with excep- 

 tion of Entosphenus tridentatus which is wanting in Japan. 



From the accounts given above, it is also true that the Lamprey 

 fauna of Japan is connected through Kamtschaka, on one hand, with 

 North America and, on the other, with Asiatic Continent. 



I wish to express my deepest thanks to my teacher, Prof. Mitsukuri, 

 who kindly looked through the manuscripts. 



Biological Laboratry, The Gakushüin, Tòkyo. 



Nov., 1900. 



