125] PROTEOCEPHALIDAE—LA RUE 125 



Zschokke (1896:775) found Ichthyotaenia torulosa (Batsch) in the in- 

 testine of Leuciscus leuciscus L. He found it in no other hosts. Von 

 Ratz (1897:159) reported finding Ichthyotaenia torulosa in Abramis 

 hrama L. and in Pelecus cultratus L. in Lake Balaton, Hungary, but 

 he gave no description. Fric and Vavra (1901:111-112) reported what 

 they considered to be Ichthyotaenia torrulosa (Batsch) (misspelling 

 for torulosa) from Leuciscus leuciscus and Perca fluviatUis, Podiebrad, 

 Bohemia. The description of their specimens agrees very well with 

 that of Proteocephalus percae and a part or all of their specimens may 

 belong to that species. The Hasling (Leuciscus leuciscus) would be a 

 new host for P. percae and it may be that their specimens from that 

 host are as they identified them, i. e., P. torulosus. Moreover, it is not 

 impossible that Fric and Vavra failed to distinguish between the two 

 species of cestode, P. percae and P. torulosus. It is impossible to make 

 a complete determination from their data. Schneider (1902:24) found 

 Ichthyotaenia torulosa in Leuciscus idus in Finland. Three years later 

 he (1905:24-25) briefly but concisely described this species from Leu- 

 ciscus idus. His description agrees very well with that of Kramer 

 (1892). 



Nufer (1905:75) reported Proteocephalus torulosus (Batsch) from 

 Perca fluviatilis, Alburnus lucidus, Squalius leuciscus, Blicca hjoerkna, 

 Oohio fluviatilis, Coregonus exiguus aVhellus, C. schinzii helveticus, 

 Salmo salvelinus. Some of Nufer 's report is open to doubt. In 59 

 specimens of Perca fluviatilis he not only failed to find the species which 

 Zschokke found in that host but he found P. longicollis and P. torulo- 

 sus, a species which only once before (Fric and Vavra, 1901) had been 

 reported from that host. In that instance attention has been called to 

 the fact that the specimens in question were probably P. percae and not 

 P. torulosus. Nufer 's P. torulosus and his P. longicollis may have been 

 P. percae. Nufer 's next four hosts after Perca fluviatilis are all Cy- 

 prinidae, from which group this species has heretofore been reported. 

 It is extremely doubtful if the Salmonidae harbor this species. Zschok- 

 ke, who in 1884 reported young specimens of Taenia torulosa from 

 Coregonus fera, in 1896 found this parasite only in Alhurnus lucidus. 

 Zschokke 's paper (1896) contained the results of his investigations on 

 more than 1600 fish from Lake Geneva and the Rhine hence his data 

 were fairly comprehensive. Moreover, from the three species of Salmon- 

 idae in which he claimed to have found P. torulosus Nufer reported 

 two other species of Proteocephalus, namely, P. longicollis and P. ocel- 

 latus. Here again Nufer probably made a misdetermination. The 

 writer has shown that Nufer 's work (see discussion of P. macrocepha- 

 lus) is untrustworthy and in the determination of this species there 



