202 
Ostertagia trifurcata 
the excretory pore is just behind these, 310 jx from the mouth. The 
cuticle is transversely striated in the anterior portion of the body. 
Fig li Ostertagia trifurcata ( X 246 diameters). Lateral view of posterior end. 
Fig. 2. Ostertagia trifurcata ( x 432 diameters). Dorsal view of spicules. 
Fig. 3. Ostertagia trifurcata ( x 246 diameters). Dorso-lateral view of the bursa. 
Referencefigures: a.l. —antero-lateralrib; e.d. —externo-dorsalrib; yuh. —gubemaculum; 
latero-ventral rib ; m.l. —medio-lateral rib ; p.l. —postero-lateral rib ; sp. —spicule ; 
v.v. —ventro-ventral rib. 
