I20 



T. KIT AHA RA. 



back, the lateral series of tlie former containing 190-210 scales and 

 that of the latter 210-240. The black round spots on the caudal are 

 also found in the Japanese species. So the difference between the 

 Japanese and the American hump-back seems to me to be too slight 

 to base specific distinction on. 



Of the genus Salvelinus, three species, viz., inalma, kundsha and 

 pluvius have been described. Their ground color and round spots can 

 not be availed of for distinguishing them from one another, as the colora- 

 tion varies much according to localities. Even the number of scales and 

 of pyrolic coeca, considered to constitute important specific distinction, 

 is also subject to considerable variations ; thus drawing the three species 

 close together. A further study of those forms may possibly necessitate 

 their amalgamation into one species. 



After all, 1 regard that of the salmon and trout indigenous to 

 Japan, the seven following species are all that are known with cer- 

 tainty for the present : 



1. One. keta W alb A UM Shaké. 



{—One. haberi Hilgendorf.) 



2. One. mason BREVOORT Masu (sea-run), or Arae- 



no-uwo (land-locked) 



(= One. perry 'i Hilg., not Brey.) 



(— One. yessoensis Hilg.) 



(— Salmo macrostoma GÜNTHER.) 



3. One. nerìcci Walbaum Beni-masu. 



4. One. gorbsha WALBAUM Karafuto-masu. 



{=Onc. mason JORD. & Snyd., not BREV.) 



5. One. kisnteli Walbaum Gin-masu. 



6 Hitcho pcrryi BREVOORT Ito. 



( = Salmo blakistoni Hlg.) 



7. Salvelinns malma WALBAUM Iwana (parr), or Ame- 

 rn as u (sea- run). 



(= ? Salmo kundsha Pallas.) 

 (= ? Salmo plnvins HlLG.) 



