50 T. IJIMA 



As is well known, Prof. M. Braun ^^ was the first to show 

 that in the Baltic region (Dorpat) the plerocercoid larvœ of B. latus 

 infest the viscera as well as the flesh of the pike (Esox lucius) and of 

 the burbot (Lota vulgaris). He proved that the above-mentioned 

 tape-worm, so common in Dorpat and vicinity, is derived from using 

 these infected fishes, and the pike especially, as food. Küchen- 

 meister ^^ alone stood out against considering the pike as the inter- 

 mediate host of B. latus, substituting certain Salmonida3 (Salmo salar) 

 in its stead. His opinion has however sutfered a well-grounded 

 refutation by Braun and Leuckart,^^ so that the former's discovery 

 stands as an established fact. According to Leuckart, Grassi in 

 Catania also succeeded in raising B. latus in himself from larvœ taken 

 from the pike. And Parona*) in Lombardy found larvœ, which were 

 experimentally proved to belong to B. latus, not only in the pike but 

 also in the perch (Perca fluviatilis). Further it turned out from 

 Zschokke's and my observations that some Salmonidœ are also to be 

 counted amonsf the intermediate hosts of B. latus. 



Zschokke's researches 5) at Geneva, one of the places noted for 

 the occurrence of B. latus, have proved that there its principal source 

 is Lota vulgaris and after it Perca fluviatilis, while infection from 

 pike and salmon is considered as occurring only in exceptional cases. 

 Of the latter, Salmo umbla was found almost regularly infested by 

 Bothriocephalus-larvai. 



1) Zur Entwicklungsgeschichte des breiten Bandwurmes. Würzburg 1883. 



2) "Wie steckt sich der Mensch mit Bothriocephalus an?" Berlin, klin. Wochenschrift. Nr. 

 32, 33. 1885.— "Die Finne des Bothriocephahis und ihre Uebertragung auf den Menschen." 

 Leipzig 1886. — " Weitere Bestätigung meiner Behauptung, dass die Finne des Hechtes nichts 

 mit Both, latus zu thun hat." Deutsche medic. Wochenschrift. Nr. 32. 188S. 



3) See Leuckart " Zur Bothriocephalus-Frage." Centralbl. f. Bactériologie u. Parasiten- 

 kunde. Nr. 1, 2. 1887. 



4) In " Estratto dei Rendiconti del R. Istituto Lombardo. Ser. II. Vol. 19. 188G. 



5) " Der Both, latus in Genf." Centralb. f. Bact. u. Parasstenk. Nr. 13, 14. 1887. 



