NO. 2131. NEMATODE PARAf^ITES OF RODENTS— HALL. Ill 



Genus UNCINARIA Froelich, 1789. 



Synonyms. — Unciarm Fischer, 1799; Dochmms Dujardin, 1845; 

 Unicinaria von Linstow, 1902 ; Uncinnarla Schmaltz, 1903. 



Generic diagnosis. — Strongyleae (p. 107) : Corona radiata not pres- 

 ent. Buccal capsule opens dorsally. Mouth round to oval, aperture 

 oblique, limited by a. transparent border. The dorsal portion of the 

 buccal capsule is shorter than the ventral and is supported by a coni- 

 cal structure, the point of which sometimes extends into the cavity. 

 At the mouth aperture the ventral wall is prolonged to form two 

 chitinous plates with cutting edges. Two ventral teeth at the base 

 of the buccal capsule. Genital tubes short and thick, forming a small 

 number of folds in a longitudinal direction. 



Type-species. — Vncinaria crimformls (Goeze, 1782) Looss, 1902. 



UNCINARIA MURIDIS Parona, 1907. 



Specifc diagnosis. — Uncinaria (p. Ill) : Body dirty white, tend- 

 ing to brown in the female ; anterior portion a little thinner than the 

 posterior. Head bent in an arc very strongly toward the dorsal 

 surface (fig. 135). Buccal capsule with strong marginal laminae 

 which bend symmetrically toward the median line anteriorly in cor- 

 respondence with a tooth for each one. The esophagus enlarges 

 posteriorly in a claviform swelling. The intestine is large and 

 straight throughout its course, except for the short rectum. 



Male 5 mm. long and thinner than the female. Genital bursa 

 bilobed, the intermediate lobule not evident. Rays simple, slightly 

 differentiated, the dorsal bifurcate. The equal spicules (fig. 136) 

 are long and thin, longer than the bursa. 



Female 7 to 8 mm. long. Tail short, conical, and mucronate. Anus 

 a transverse slit (fig. 137). The coils of the oviduct extend very far 

 forward, almost to the posterior end of the esophagus, and turn 

 l)ack in serrate loops. The vulva is a little in front of the middle of 

 the body. Vulva lips not prominent. Eggs in the vagina region 

 are oval, transparent, and not very numerous. Some are segmenting, 

 others show a larva doubled back on itself in the shell. 



Hosts. — Otomys irroratiis^ Ofoniys irroratus tropicalls. 



Location. — Intestine. 



Localities. — Kaziba and Fort Portal, Africa, 



The species is left in the genus Uncinaria., not with any conviction 

 that it belongs there, but because Parona calls it Uncinaria and there 

 is not sufficient evidence to show where it belongs. The position of 

 the vulva would indicate that the worm belonged in the Bunostomeae, 

 as would the fact that the dorsal ray is bifurcate. But the figure, 

 which shows that the worm has an esophageal bulb, would indicate 



