1932 



ANNUAL REPORT, 1931 



21 



Filarioides bronchialis (Gmelin 1790) {Filarioides mustelarum Rud., 1819). 



These parasites are commonly found in trapped mink and occur as a small 

 knot of closely intertwined worms lying below the mucosa of the trachea and 

 bronchi and also on the surface of the pulmonary vein. Great difficulty is 

 encountered in the removal and clearing of these w^orms and a study of their 

 morphology has not been attempted. The worm is viviparous. 



The uterine eggs measure from 0.067 mm. to 0.078 mm. in length by 

 0.042 mm. to 0.045 mm. in breadth. They are ellipsoidal in shape, thin-shelled 

 and contain undeveloped larvae. 



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Fig. 2. — -Plagiorchis proximns: os., Oral sucker; ph., Pharynx; ce., Ceca; gp., Genital 

 pore; cs., Cirrus sac; vs., \'entral sucker; ov., Ovary ; ut.. Uterus; t., Testes; vit., X'itellaria. 

 (Original, Law and Kennedy.) 



Plagiorchis proximus. Barker, 1915. 



Frequently found in duodenum of mink and muskrat trapped in the vicinity 

 of Kirkfield, Ontario. Length 1.32 mm. to 1.51 mm., width anterior to testes 

 0.45 mm. to 0.65 mm. elongate piriform, tapering anteriorly. Testes are rounded 

 and lie obliquely to each other in the posterior region, measuring 0.126 mm. to 

 0.145 mm. long by 0.097 mm. in width. Ovary round, situated laterally and 

 anterior to testes, 0.145 mm. to 0.155 mm. in diameter; vitellaria e.xtends 

 anterior to ventral sucker to the posterior end of body. Oral sucker 0.174 mm. 

 to 0.194 mm. in diameter; ventral sucker 0.076 mm. in diameter. Cirrus sac 

 narrow and long, terminating near the xentral sucker. Pharynx and oesophagus 

 of equal length, 0.067 mm. to 0.065 mm. 



Eggs pale yellow in colour with a well defined shell, measuring from 0.033 mm. 

 to 0.036 mm. in length by 0.020 mm. to 0.022 mm. in width. 



