NO. 2350. NEMATODE GENUS NEMATODIRUS—MAY. 581 



lobes. Bosses few and small. Spicules, 0.70 to 1.10 mm. long, pro- 

 vided with spoon-shaped terminal piece. Esophagus as in N. fiU- 

 collis. Female, 15 to 23 mm. long. Vulva and anus located as in 

 N. fiUcolUs. Eggs, 150 to 220 [x by 80 to 110 \i, with smooth shells of 

 nearly uniform thickness. 



H ahitat.— Small intestine of sheep, cattle, goats, deer, camels, and 

 rodents. 



Distrihution. — Almost cosmopolitan. 



NEMATODIRUS ABNORMALIS, new species. 



Plate 32, fig. 23 ; pliite 34, fig. 29. 



Speci-fiG diag?iosis. — N cniatodirus : Species considerably larger 

 than N. fiUcolUs. Male, 11 to 17 mm. long and 150 to 200 [jl in great- 

 est diameter. Bursa relatively small, with heavy rays. Dorsal 

 lobes set off from lateral lobes by deep indentations. Externo-dorsal 

 ray nearer edge of bursal membrane throughout median third than 

 at its distal end. Bosses numerous, small. Spicules, 0.90 to 1.25 

 mm. long, provided with an asymmetrical, pointed terminal piece. 

 Asymmetry is due to the fact that one spicule is slightly shorter than 

 the other, and the two are twisted at the end. Length of esophagus 

 as in N. fUcoUis. Female, 18 to 25 mm. long. Location of vulva and 

 anus as in N. fHicoUis. Eggs, IGO to 230 \^ by 85 to 115 ]}., with smooth 

 shell of nearly uniform thickness. 



Habitat. — Small intestine of sheep and goats. 



Distrihution. — America. 



Tyj)e specimens. — U.S.N.M. Helminthological Collections, No. 

 19303, collected from a maltese goat by E. C. Stevenson at Bethesda, 

 Maryland, August 14, 1906. 



NEMATODIRUS HELVETIANUS. new species. 



Plate 31, fig. 20 ; plate 35, fig. 30. 



Specific diagnosis. — Nematodirus: Species much like N. abnor- 

 malis. Rays of bursa not so heavy; dorsal rays less distinctly set 

 off ; externo-dorsal ray nearest the edge of the membrane at its distal 

 end. Bosses few and large. Spicules, 0.90 to 1.25 mm. long, pro- 

 vided with a sharp, symmetrical terminal piece, much as in A'', fili- 

 collis. Female and eggs as in N. abnormalis. 



Habitat. — Small intestine of cattle. 



Distribution. — Switzerland, 



Type specimens. — U.S.N.M. Helminthological Collections, No. 

 15728, collected from the small intestine of an ox by O. Schnyder 

 in Switzerland, October 17, 1905. 



