288 ILLINOIS BIOLOGICAL MONOGRAPHS [288 



Distribution of the Proteocephalids of Fish According to 



Continents 



The accompanying table lists the Proteocephalid species which are 

 found on each continent. An examination of the table shows that in 

 Europe there are 12 well known and 5 doubtful species. All are pecu- 

 liar to Europe with the exception of P. macrocephalus which occurs 

 also in North America along the Atlantic coast. In North America 9 

 species are known. Of these 2 are doubtful. All are peculiar except 

 P. macrocephalus. From South America 4 species are recorded. All 

 are peculiar. Likewise from Africa 3 species are recorded and all are 

 peculiar. No species of this group have yet been reported from Asia 

 or Australia, probably because but little parasitological work has been 

 done on the fish of those continents. Nor are there any records as 

 yet from the West or East Indies, Greenland, or Iceland. There 

 has been but a singe collection record from Great Britain, where the 

 parasites of fresh- water fishes seem to have had little attention. 



The records are as yet too meager to justify any broad conclusions 

 as to the distribution of these cestodes over the larger land areas. One 

 may expect to find the same Proteocephalid species in the hosts which 

 are common to Europe and North America. One such case is known, 

 namely, that of P. macrocephalus in Anguilla. Esox lucius which is 

 common to both of these continents harbors one species in Europe and 

 another one in North America. Other fish species occurring in both 

 continents have apparently yielded no records in the literature. 



Distribution of Fish Proteocephalids according to Continents 



Continent 

 Europe 



North America 



South America 



Africa 



Asia 



Australia 



Species of Proteocephalid found 



Proteocephalus agonis, P. cernuae, P. cyclops sp. inq., P. dubitis, 



P. esocis, P. fallax, P. filicollis, P. hemisphericus sp. inq., P. 



longicoUis, P. macrocephalus, P. neglectus, P. osculatus sp. inq., 



P. percae, P. sagittus sp. inq., P. salmonis-umblae sp. inq., P. 



skorikowi, P. torulosus. 

 P. ambloplitis, P. exiguus, P. macrocephalus, P. nematosoina sp. 



inq., P. perplexus, P. pinguis, P. pusillus, P. salvelini sp inq., 



P. singularis. 

 P. fossatus, P. macrophallus sp. inq., Corallobothrium lobosum, 



Choanoscolex abscisa. 

 P. pentastoma, P. sulcatus, Corallobothrium solidum. 

 No species reported. 

 No species reported. 



