NO. 2131. 



NEMATODE PARASITES OF RODENTS— HALL. 



27 



cated at the union of the esophagus and the intestine. Eggs lemon- 

 shaped, 57 to 62 /i, long. 



Hosts. — Mils musculus, Ephnys rattus {Mus rat f us), Arvicola am- 

 pMh'ms {Mus amphihius) , Apodemits sylvatieus {Mus sylvaticu^) , 

 Epimys ugandae {Mus ugandae), Microtus arvalis {Arvicola arvalis, 

 Mus arvalis), Thrichomys apereoides {Echinomys antricola), Holo- 

 chilus physodes {Ilesperomys physodes), Ilolochilus hrasiliensls 

 {Ilolochilomys brasili^nsis) , Arvicanthis ahyssinicus, Isothrix his- 

 triata {Loncheres bistriata), Georychus capensls {Georhynchus ca- 

 pensis ) . 



Location. — Cecum. 



Localities. — France (Paris), Germany, Africa (Toro, Fort Portal). 



TRICHURIS OPACA Barker and Noyes, 1915. 



Specific diagnosis. — Triehnris (p. 20) : Body cylindrical, stiff, 

 opaque ; anus a little subterminal. 



Male 22 to 28 mm. long; esopha- 

 geal region 13 to 19 mm. long and 

 GO to 80 [JL thick; body region 7 to 9 

 mm. long and 140 to IGO [t. thick (fig. 

 29). Posterior end rolled into a spi- 

 ral (fig. 30). Spicule 2 mm. long and 

 17 [i- thick, surrounded by a sheath 

 covered with minute blunt projec- 

 tions; sheath, when evaginated, 180 [x 

 long and 70 [). in diameter. 

 Female 22 



to 3 m m . 



long; esopha- 

 geal region 



18 to 19 mm. 



long and 60 



to 70 [I thick; 



body region 



10 to 11.1 



mm. long and 



230 to 250 [X 



thick (fig. 



31). Poste- 

 rior portion 



slightly 



curved. Vulva between first and second anterior elevenths of body 

 region. Anus nearly terminal. 



Host. — Ondatra zibetJiica {Fiber zibethicus). 



riG.29.— TrICIIURIS OPACA. MALE. AfTER 



Barker, 1915. 



I mm. 



FlG.30.— TrICEURIS OPACA. POS- 

 terior extremity of male. 

 After Barker, 1915. 



