234 
TABLE II 
SPECIES OF ACANTHOCEPHALA REPRESENTED IN EUROPEAN AND NorTH AMERICAN 
FRESH-WATER Hosts EXcLusivE or BIRDS 
PISCES 
Gonecaet Species found in Species in Species known 
Acanthocephala European hosts Illinois River to occur in 
(Liihe, 1911) hosts North America 
Echinorhynchus......... WUTIDE teen aes thecatus........ coregoni 
SQIMONIS SPU Ts Alico ene salvelini 
CHOC UG feeomre ee ele sic techie bet cee gadi (?) 
CO LTAEOM (LD ERA era cl Be- fe Cee Ite et thecatus 
Pomphorhynchus........ LQEVIUS a ctelsts tccgstehs bulbocolli....... bulbocolli 
Acanthocephalus........ | anguillae 
lucii 
Rhiadinorhynchus........ MTiSti a vndiereE eka ee ae tenuicornis? 
Neoechinorhynchus...... MUTA dis io maks Stee cylindratus..... | cylindratus 
tenellus 
| crassus 
Tanaorhampnus sce ctolers| coat er een tasie ees longirostris..... longirostris 
Octospinifer sari sie eee bite cbnere Mere sete macilentus...... macilentus 
Gracilisentisn losis bsctecaulovetieiee svameespeeiareiere gracilisentis gracilisentis 
| 
AMPHIBIA 
Acanthocephalus........ OLE CDUS Se Buecatises sal ledeve easeronigeutne sisaeests ranae 
ranae 
anthuris 
REPTILIA 
Neoechinorhynchus...... | TWCLULN Se egahe anata | CUVUOAS nr ere aery | emydis 
SYSTEMATIC CONSIDERATION OF SPECIES 
So little has been written concerning the Acanthocephala of American 
fresh-water hosts that it seems desirable to bring together the scattered 
descriptions of the known species and to add to these the descriptions of a 
number of new species. This seems especially desirable in order that 
those interested in the study of economic problems, especially those con- 
nected with the fisheries industry, may have a ready means of identifying 
species in this important group of fish parasites. The older literature, even 
within its limited scope, does not meet this demand because of the failure 
of the earlier workers to recognize the distinctness of North American 
Acanthocephala from the Acanthocephala found on the Europeon conti- 
nent. Again, many erroneous identifiications of species have apparently 
extended the range of distribution for known forms owing to the inade- 
quate available descriptions of the species reported upon. In the following 
section descriptions are given for the genera and species of Acantho- 
