488 



38) Gusterò stomum armatum Molin. 

 Caeca and duodenum, 

 Acanthocottus scorpius L. (Sculpin). 

 Hemitripterus americanus Gmel. (Sea Raven). 

 Hippoglossus hippoglossiis L. (Halibut). 

 Brosmius brosme Müller (Cusk). 2X0,85. 



II. From Fresh-water Fislies. 



39) Diplohothrium armaium F. R. Leuck. 



(== DiclihotJirium armatum). 

 Gills, Acipenser rubicundus Le S. (Lake Sturgeon). 20X1. 



40) Megadistomum longum Leidy. 



Mouth, pharynx, oesophagus, stomach. 



Esox masquinongy Mit. (Muskallunge). 



New genus: f^éyaç, great. 75X3, flat, thin wavy edges. Ventral 

 sucker smaller than oral, 5 from anterior end. Ovary and testes 

 seen as nodules; ovary 39,5, first testis 44, second testis 48,5 from 

 anterior end. Uterus as dark band along centre of body from ovary 

 to ventral sucker. Genital opening in front of ventral sucker. Large 

 living worms may extend to 5 inches and are reddish-pink in color. 

 In general structure closely resembling Otodistomum veliporum but 

 is larger, flatter, the sizes of the suckers are reversed, the genital 

 glands are placed farther back and are separated from each other, 

 the genital opening is nearer the ventral sucker. The intestinal 

 system and the main excretory vessels as well as the integument are 

 similar in the two worms. Alcoholic specimens 18 mm long and 

 more than 1 mm wide have genital glands developed but no eggs. 



41) Azigia tereticoUe flud. 



Mouth, pharynx, oesophagus, stomach. 



Esox lucius L. (Pike). 



Lota maculosa Le S. (Ling). 



Ameim'us nigricans Le S. (Great Cat-fish). 



12X1. Agrees with the preceding species in the positions and 

 relative sizes of the organs but is of much smaller size. The egg is 

 less than two-thirds the size of that of Megadistomum longum. The 

 largest individuals are smaller than immature individuals of Mega- 

 distomum. 



42) Mimodistomum aügusticaudum. 



Mouth, pharynx, oesophagus, stomach. 

 Lota maculosa Le S. (Ling). 

 Stizostedion vitreum, Mit. (Dory). 



