56 I. IJIMA 



sent from Yezo preserved in Sake-dveg ÇKasii). A few other enquiries 

 were made of persons who had been tape-worm patients and many of 

 them recollected having eaten 0. Perryi in some form or other. 



To all appearances then 0. Perryi is the chief source of B. latus. 

 I do not wish however to emphasize this too strongly, since my 

 examination of other river-fishes is still very incomplete. 



Onchorhynchus Haberi, another species of salmon common in 

 Japan, closely resembling 0. Perryi in habits and other respects, is 

 peculiarly open to suspicion. Nevertheless, three specimens of this 

 fish, obtained in the Tokyo market and carefully searched by Mr. 

 Kikuchi and myself, showed no trace of Bothriocephalus-larvre. 

 Carassius auratus (Funa), Cyprinus carpio (A'oi), Plecoglossus alti- 

 velis (Ayii^ and a species of Salmo (Yamahe^ were also searched but 

 with neofative results. However the number of individuals examined 

 was, as in the case of Onchorhynchus Haberi, too small to allow of 

 much weio-ht being attached to the conclusions. A more complete 

 investigation of our fresh-water fishes is very much to be desired. 



