DIGENETIC TREMATODES 43 



Notocotylus urbanensis (Cort, 1914) Harrah, 1922 



Synonyms : Ccrcaria urbanensis Cort, 1914 



Monostomum sp. Stiles & Hassell, 1894 



Hosts : Ondatra zibethica B.C. Knight, 1951 



Ondatra zibethica Ore. Rider & Macy, 1947 



For additional hosts see Harrah (1922). 



Morphology: This form has been redescribed by Skrjabin (1953). 



Biology : Cercariae develop in various species of Physa and Lymnaea, emerge, 

 encyst on vegetation, and develop in the definitive host — (Cort, 1914; Cort, 

 McMullen, and Brackett, 1937; Cort, Oliver, and McMullen, 1941). Herber 

 (1950, 1955) did a careful review of the life history work and showed cer- 

 tain discrepancies in the conclusions of the earlier workers. 



Notocotylus sp. 



An unidentified species of Notocotylus has been reported from Oregon from 

 Ondatra zibethica by Senger and Neiland (1955). 



Ogmogaster plicatus (Creplin, 1829) Jagerskiold, 1891 



Synonyms : Monostomum plicatum Creplin, 1829 



Ogmogaster antarcticus Johnston, 1931 



Hosts : Balaenoptera borealis B.C. Margolis & Pike, 1955 



Balaenoptera physaUs B.C. Alargolis & Pike, 1955 



Additional hosts were reviewed by Margolis and Pike, 1955. 



Taxonomy: Margolis and Pike (1955), Dawes (1946), and Price (1932a) 

 agreed that O. antarcticus is a synonym of O. plicatus even though both 

 Skrjabin (1953) and Yamaguti (1958) included O. antarcticus as a valid 

 species. 



Morpholog>^ This form was figured and described by Skrjabin (1953). No life 

 history is known for this genus. 



Quinqueserialis quinqueserialis (Barker and Laughlin, 1911) Harwood, 1939 



Synonym : Notocotylus quinqueserialis Barker & Laughlin, 1911 



Hosts : Ondatra zibethica Wash. Harrah, 1922 



Ondatra zibethica Ore. Senger & Neiland, 1955 



Ondatra zibethica B.C. Knight, 1951 



Taxonomy : This form was confused with Notocotylus urbanensis by Harrah 

 (1922) according to Herber (1955), and Yamaguti (1958). Synonymy was 

 discussed by Smith (1954). 



Morphology: Skrjabin (1953) described and figured the worm. 



Biology : The cercariae of this form develop in Gyraulus parvus according to 

 Herber (1939, 1942). 



