STROXGYLIX.E] 281 



III. Bunostomeae. Strongylinae (p. 280).— The ventral and latero- 

 ventral rays of the bursal lobes are close together and parallel. The 

 medio-lateral and posterolateral rays are not close together and are 

 not parallel. The dorsal ray ends in a bifurcation. The vulva of the 

 female is situated in the middle of the body or a httle anterior to the 

 middle; uteri divergent. The tribe includes four genera, as follows: 



Genus I. Bunostomum 

 Genus II, Gaigeria 

 Genus III. Bathmostonunn 

 Genus IX. Grammocephalus 



IV. Cylicostomeae. Strongyhnae (p. 280).— The ventral and latero- 

 ventral raj's of the bursal lobes are close together and parallel. The 

 medio-lateral and postero-lateral raj's are not close together and parallel. 

 The dorsal and externo-dorsal rays originate separately. The vulva 

 of the female is situated close to the anus; uteri convergent. The tribe 

 includes four genera, as follows: 



Genus I. Cylicostomum 



Genus II. Q^sophagodontus 



Genus III. Gyalocephalus 



Genus IV. Triodontophorus 



Y. Syngameae. Strongylinse (p. 280). — The bursa is obhquely trun- 

 cated. The anterior and middle rays are cleft, the posterior tridigitate. 

 The vulva of the female is situated in the anterior quarter of the body; 

 uteri divergent. The tribe includes one genus — Syngamus. 



XODULAR StROXGYLOSIS OF THE ShEEP AND GOAT. CEsOPHAGOSTO- 



MIASIS 



1. (Esophagostomum columbianum. Fig. 145. Strongylinse (p. 

 280). — The thickness of the body is nearly uniform over its greater 

 portion; attenuated toward ends. The anterior portion is usually 

 curved in the form of a hook. The cuticle surroimding the mouth is 

 inflated to form a collar which has ahnost the shape of a hemisphere. 

 Six circum-oral papillse penetrate this mouth collar. In front of the 

 middle of the esophagus there is a transverse groove with accompanying 

 cuticular fold extending around the body to the lateral lines. There are 

 two cervical papillae in front of the middle of the esophagus. Posterior 

 to the cervical groove are two lateral membranes which extend well 

 back along the lateral lines. The bursa of the male has two lateral lobes 

 united by a small median lobe. The spicules are 750-850 microns in 

 length, slender and pointed. The ^^lva of the female is naked, trans- 

 versely elongated, and situated a short distance in front of the anus. 



The length of the female is 14-18 mm. (9/16-11 16 of an inch); male, 

 12-15 mm. (1 '2-19 '32 of an inch). 



