42 DEPARTMENT OF GAME AND FISHERIES No. 9 



the posterior one; the latter occupying nearly the entire width of the parasite. 

 Ovary is lobed, 0.37 mm. long by 0.51 mm. wide. Mehlis gland prominent to 

 the right of anterior testis. Ceca bifurcate from pharynx to below the ventral 

 sucker where they curve backwards for a short distance and then continue to 

 the posterior end of body ending blindly near the genital pore. The uterine 

 coils take a greatly convoluted course and finally proceed between the ceca to 

 the posterior end of the body to form the common genital duct. Ova numerous, 

 oval in shape from 0.140 mm. long to 0.090 mm. wide. 



Hemistomum crateriim. Barker and Noll, 1915. 



This is one of the smallest parasites found in the duodenum of the mink 

 and muskrat. Fresh specimens measure 0.95 mm. to 2 mm. long by 0.58 mm. 

 to 0.62 mm. wide. Oral sucker rounded and subterminal. Ventral sucker 

 prominent, in the median line directly anterior to adhesive organ. Adhesive 

 organ large and round, 0.23 mm. in diameter. Two pair of intestinal ceca 

 appear to be present. The ceca arise at the posterior end of the pharynx and 

 appear to disappear behind the adhesive organ. Ovary round, lying to right 

 of median line, anterior to right testis. Shell gland opposite to ovary and 

 slightly to left of median line. Testis oval, in posterior region of body and 

 perceptibly oblique. Excretory pore comparatively large and directly between 

 testis. Vitellaria coarsely scattered from level of ventral sucker to a short 

 distance anterior to ovary. 



No eggs were found in three specimens studied. 



The following internal parasites have been found in Ontario fur-bearing 

 animals, examined at the Experimental Fur Farm. 



FOX 

 Nematoda 



Toxocaris canis, Werner, \782.^Belascaris marginata, Rud., 1802 Intestines 



Uncinaria stenocephahi, Raillet, 1884 Intestines 



Eiicoleus aerophilus, Creplin, 1839 Trachea, Bronchi, Lungs 



Capillaria plica, Rudolphi, 1819; Raiiiet, 1915 Urinary bladder 



Crenosoma decoratum, CrepHn, 1847; Stoss, 1898 Lungs and Trachea 



Toxascaris limhata, Raillet and Henry, 1911 Intestines 



Trematoda 



Alaria americana, Hall and Wigdor, 1918 Intestines 



Alaria arisaemoides, Augustine and Uribe, 1927 Intestines 



Cestoda 



Diphyllobothrium latum, Linnaeus, 1758 Intestines 



Diphyllobolhrium cordalum, Leuckart, 1863 Intestines 



MINK 



Nematoda 



D ioctophyme renale, Goeze, 1782; Stiles, 1901 Kidney, Body cavities 



Filaroides bronchialis , Gemlin, 1790. = Filarotdes mustelarum, Rud., 1819. 



Trachea and Bronchi 



Capillaria sp Intestines 



Strongloides sp Intestines 



Ascaris sp Intestines 



Filaria sp Trachea 



Trematoda 



Plagiorchis proximus. Barker, 1915 Intestines 



Euparyphiiim melts, Shrank, 1788 Intestines 



Alaria miistelae, Bosma, 193 1 Intestines 



Parametorchis canadensis, Price, 1929 Gall Bladder 



Euparyphiiim inerme, Fuhrmann, 1904 Intestines 



