INTERNAL PARASITES OF THE SEBAGO SALMON. 1 1 55 



In a later paper (18 19) Rudolphi added to the list no new parasite, Dis- 

 toma appendiculatum Rudolphi being merely another name for D. crenatum of 

 the appendix in the earlier work. In this list Echinorhynchus fusiformis Zeder 

 is only a change of name from E. inflatus of the earlier list; E. nodulosus is 

 omitted; Bothriocephalus solidus is interpreted as introduced by accident when 

 its proper hosts chance to be eaten by the salmon. Thus the true list of salmon 

 parasites is actually reduced, and numbers only seven in this later list of 

 Rudolphi. 



In 1851, Diesing in his "Systema Helminthum" recorded for Salmo salar 



ten parasites, as follows : 



Distomum varicum. 

 Stenobothrium appendiculatum. 

 Schistocephalus dimorphus. 

 Dibothrium proboscideum. 

 Echinorhynchus pachysomus. 

 Echinorhynchus proteus. 

 Agamonema capsularia. 

 Ascaris capsularia. 

 Ascaris clavata. 

 Cucullanus elegans. 



Although one notes at once the unfamiliar appearance of the list due to 

 numerous changes in the names employed, yet only the last two are actually 

 new forms. Thus, in spite of the frequent attention given to the salmon, the 

 list of its parasites had only increased from five to ten species in the seventy- 

 five years since O. F. Miiller first made scientific records of its parasitic fauna in 

 Denmark. 



In 1878 von Linstow in the "Compendium der Helminthologie " list\>d 16 

 parasites for Salmo salar. New are : 



Distomum ocreatum Rudolphi. 

 Distomum reflexum Creplin. 

 Bothriocephalus cordiceps Leidy." 

 Tetrarhynchus grossus Rudolphi. 

 Tetrarhynchus solidus Drummond. 



In his "Nachtrag" (1889) the same author includes five new species of 



parasites recorded for Salmo salar since the appearance of the earlier record, 



namely : 



Agamonema communis Diesing. 

 Distomum miescheri Zschokke. 

 Bothriocephalus sp.? Zschokke. 

 Leuckartia sp. ? Moniez.' 

 Tetrabothrium minimum von Linstow. 



o As indicated in the discussion (p. 11 66), this is an error in citation. 



b Moniez ( 1 88 1 ) found three cestodes in the pyloric cceca of a salmon obtained in the fish market 

 at Lille (France), on which he based a new genus, Leuckartia. Except for the lack of a scolex, the 

 specimens agree well with Bothriocephalus infundibulijofmis, hetter .ibothrium crassum, to which they 

 may well belong. 



