12 ILLINOIS BIOLOGICAL MONOGRAPHS [230 



Monostomum spatulatum Leidy 1858:111 



Monostomum spathulatum Leidy of Diesing 1859:426 



Monostomum asperum Vaillant (nee. Nitzsch) 1863:6-7; 1863:347-348 

 Monostomulum asperum Vaill. of Brandes 1892:504-511 

 Monostomum aspersum Vaill. of Pratt 1902:966 

 Monostomum aspersum Vaill. of Pratt, Ward 1918:382 



Monostomum mutabile Zeder of Leidy 1885:9 

 Cycloccelum leidyi nov. spec, of this paper 



Monostomum obscurum Leidy 1887:24 



Cyclocoelum obscurum (Leidy) of this paper 



Monostomum amiuri Stafford 1900:402 



Cyclocoelum vicarium (Arnsdorff 1908) Kossack 1911:518 

 Monostomum vicarium Arnsdorff 1908:362 



Nolocotyle quinqueserialis Barker and Laughlin 1911:261-274 



Catatropis filamentis Barker 1915: PL I, fig. 6 

 Catatropis fimbriata Barker 1915:190 



Nudocotyle novicia Barker 1916:175-184 



Heronimus chelydrae MacCallum 1902:632-636 



Aorchis extensus Barker and Parsons 1914:193-194 



Collyriclum colei Ward 1917:2-3 



Monostoma faba Cole 1911:42-48 

 Collyriclum f aba Tyzzer 1918:267-292 



NEW SPECIES DESCRIBED IN THIS PAPER 



Cyclocoelidae 



Cyclocoelinae 



Cyclocoelum leidyi nov. spec. 

 Cyclocoelum pseudomicrostomum nov. spec. 

 Cyclocoelum macrorchis nov. spec. 

 Cyclocoelum wilsoni nov. spec. 

 Cyclocoelum halli nov. spec. 

 Cyclocoelum triangularum nov. spec. 

 Cyclocoelum cuneatum nov. spec. 

 Notocotylidae 



Notocotylinae 



Notocotylus urbanensis (Cort) 



(Cercaria only known previously) 

 Paramonostomum echinum nov. spec. 



