STRONGYLIN^ 



Fig. 147. — CEsophagosto- 

 mum columbianum. En- 

 larged bursa of male viewed 

 from right side: d, dorsal 

 e. 1., externo-lateral 

 1. v., latero-ventral 

 m. 1., medio-lateral 

 p. 1., postero-lateral 

 V. v., ventro-ventral 

 (After Ransom, Bull. 

 No. 127, Bureau An. Ind., 

 U. S. Dept. Agr.). 



ray; 

 ray; 

 ray; 

 ray; 

 ray; 

 ray. 



Fig. 150. 



Fig. 148.— CEaopha- 

 gostomum venulosum; 

 male at right, female 

 at left. * Vulva. x5. 

 (After Ransom, Bull. 

 No. 127, Bureau An. 

 Ind., IT. S. Dept. Agr.). 



Fig. ISO. — (Esopha- 

 gostomum venulosum. 

 Enlarged bursa of male 

 viewed from right side: 

 d., dorsal ray; e. d., ex- 

 terno-dorsal ray; e. 1., 

 externo-lateral ray; m. 

 1., medio-lateral ray; 

 p. 1., postero-lateral ray; 

 sp., spicules; v. v., ven- 

 tro7ventral ray. (After 

 Ransom, Bull. No. 127. 

 Bureau An. Ind., U. S. 

 Dept. Agr.). 



— l.tn. 



Fig. 149. — CEsopha- 

 gostomum venulosum. 

 Anterior portion of 

 body — enlarged, ventral 

 view: «. g., cervical 

 groove; c i, cervical in- 

 flation; c. p., cervical 

 papilla; es., esophagus; 

 int., intestine; 1. m., 

 lateral membrane; 1. p., 

 lateral circumoral pa- 

 pilla; m. c, mouth col- 

 lar; n. r., nerve ring. 

 (After Ransom, Bull. 

 No. 127, Bureau An. 

 Ind., U. S. Dept. Agr.) 



Parasitic in the large intestiae, more rarely in the small intestine, of 

 the sheep and goat. The species has been collected in Europe and in the 

 United States. It is much less common in this country than (Esophagos- 

 tomum columbianum. 



Occurrence and Development. — Nodular disease of the intestines 

 of sheep caused by (Esophagosotomum columbianum is common in the 



