ART. 3 A li^EW TEEMATODE WORM WETZEL 6 



a sinuous manner to the ootype. The vitellaria consist of paired 

 follicles extending from a short distance caudad of the union of the 

 ceca to near the posterior end of the body. The vitelline duct 

 extends anteriorly in a teinuous manner andj'oins the oviduct at the 

 ootype. The uterus is muscular, short, and slightly coiled ; no eggs 

 were present in the specimens available for study. The genital pore 

 is in the median ventral line immediately caudad of the acetabulum. 

 Eggs collected from the intestinal contents are oval, 63 to 09^ long 

 by 48 to 51/x wide, thin-shelled, provided with a small terminal spine, 

 and contain active miracidia. 



Host. — Branta canadensis canadensis. 



Location. — Branches of portal and mesenteric veins. 



DistribvMon. — North America (United States; collected at Wash- 

 ington, D. C, from a host from Back Bay, Va.). 



Tyfe s-pecimens. — United States National Museum Helminthologi- 

 cal Collection No. 29T18 ; paratypes No. 29719. 



This species differs from the other members of the genus Omitho- 

 hilharzia mainly in two points: (1) The number of testes is smaller; 

 and (2) the females are longer than the males. On the other hand 

 this fluke resembles Ornithohilharzia intermedia Odhner, 1912, the 

 type of the genus, in many respects, especially as regards the elon- 

 gated, loosely coiled ovary in the female. In order to bring the 

 generic diagnosis given above in accordance with the characters. of 

 the new species, the following emendation is proposed: Female 

 shorter or longer than male. Testes numerous (28 or more), extend- 

 ing into posterior half of body or confined to the anterior half. 



For the purpose of separating OmitTiohilliarzia 'pricei from the 

 other species of the genus the following key is appended : 



KEY TO THE SPECrES OIT THE GKNDS OliNITHOBILHAEZIA 



1. Parasitic iu mammals 2. 



Parasitic in birds 3. 



2. Cuticle of male smooth; testes 70 to 80 in number; egg 72 to lA^i by 22 to 26^, 



with a spinous process at each pole 0. turkestanicum. 



Cuticle of male tuberculate ; testes 61 in number ; egg 100 to 136,a by 44 to GO/x, 

 with a spine at one pole 0. bomfordi. 



3. Species inadequately described 4. 



Species adequately described 5. 



4. Male 14 mm. long ; oral sucker 364ja in diameter ; acetabulum o60|U. in diame- 



ter; female unknown; in Hydrocoloeus melanocephalus 0. kowalewskii. 



Male 16 mm. long; oral sucker 312/^ by 104 to 160,a; acetabulum 450/^ iu 

 diameter; female shorter than male; in Thylnsseiis niaxbnus (=S/er«a- 

 galericulata ) 0. canaliculata. 



5. Male 40 to 57 mm. long ; testes 230 to 250 in number ; female unknown. 



0. macrobilharzia. 

 Male 11 mm. or less in length ; female known 6. 



