178 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. .42. 



specimens they appear to be straight. The gubernaculiim (fig. 2, 

 guh.) is irregularly trihedral in shape, somewhat resembling a plow- 



|g:#:\->f^-^ 



oe^^'.Z 



Oi)//'.3. 



lOOyU. 



Fig. 3.— Ostertagia bullosa. Tail 

 of female, viewed from left side. 

 Enlarged. 



share in outline when viewed from 

 the side, and prolonged into a 

 short slender process anteriorly. 

 Measured from the side it is about 

 2b [X wide and 65 [x long. It is of 

 the same yellow-brown color as 

 the spicules. 



AAvell-marked character of this 

 species is a prominent cuticular 

 swelling anterior of the bursa on 

 the ventral surface (fig. 2, hul,). 

 For some distance anterior of the 

 swelling the cuticle on the ventral 

 surface is somewhat thickened and at a distance of 100 to 125 jx in 

 front of the bursa the cuticle splits to form this swelling. When 



ioq,u. 



Fig. 4.— Ostertagia bullosa. Region of 

 vulva of female, viewed from left 

 side, e., egg; lah., rudimentary cutic- 

 ular FLAP anterior OF VULVA: OVij. 1, 



terminal portion OF ovijector: ovij. 2, 

 sphincter OF ovi.tector; ovij. 3, nonmus- 

 cuLAR portion OF ovijector; ut., uterus; 

 vul., VULVA. Enlarged. 



