36 TREMATODES OF THE PACIFIC NORTHWEST 



Additional hosts have been reported from Siberia bv Layman (1930) ; Japan 

 by Yamaguti (1934, 1938, 1939, 1940, 1951); Madeira by Nigrelli (1940); and 

 California by Park (1936). 



Morphology: This worm was figured and described by each of the W"orkers who 

 described one of the synonyms and was redescribed by McCauley (1960). 

 Nothing is known of the life history. 



Family HETEROPHYIDAE 



Apophallus donicus (Skrjabin and Lindtrop, 1919) Price 1931 



Synonyms : Rossicotrema donicum Skrjabin & Lindtrop, 1919 

 Rossicotrema simile (Ransom, 1920) Ciurea, 1924 

 Rossicotrema venustus (Ransom, 1920) Morozov, 1952 

 Cotylophallus similis Ransom, 1920 

 Cotylophalhis venustus Ransom, 1920 



Host: Gull Ore. Shaw, 1947 



Morphology: Described and figured by Morosov (1952) as Rossicotrema doni- 

 cum which he considered to be the valid name. 



Cryptocotyle lingua (Creplin, 1825) Fischoeder, 1903 



Synonyms : Distoma lingua Creplin, 1825 



Tocotrema lingua of Looss, 1899 

 Dermocystis ctenolahri Stafiford, 1905 

 Halluni caninimi Wigdor, 1918 



Host: Larus glaucescens Wash. Ching, 1960a 



Biology: Stunkard and Willey (1929) and Stunkard (1930) found that the 

 pleurolophocercous cercaria develops in Littorina littorea, penetrates and 

 encysts in the cunner, and excysts in the guts of birds and mammals. 



Euryhelmis paciBca Senger and Macy, 1952 



Hosts : Mustela vison Ore. Senger & Macy, 1952 



Senger & Macy, 1952 

 Senger & Macy, 1952 



Senger & Macy, 1952 

 Senger & Neiland, 1955 

 Senger & Neiland, 1955 

 Senger & Macy, 1952 



Euryhelmis squamula (Rudolphi, 1819) Poche, 1926 



Synonyms : Distoma squamula Rudolphi, 1819 



Eurysoma squamula (Rudolphi, 1819) Dujardin, 1845 

 Monostomum squamula Diesing, 1851 



Host : Mustela vison Ore. Senger & Neiland, 1955 



