28^2 



PARASITES OF THE DOMESTIC ANIMALS 



Fig. 145. — -ffisophagostomum columbianum; male 

 at left, female at right. * Vulva. x5. (After Ran- 

 som, Bull. No. 127, Bureau An. Ind., U. S. Dept. 

 Agr.). 



The eggs are oval, 65-75 microns in Fig. 146. 

 length by 40-45 microns in breadth, "'"'^i^^""^- 



ffisophagostomum col- 

 Anterior extremity, 

 ventral view, — enlarged: c. g., cer- 



Segmentation occurs while thej^ are within vical groove; c. p., cervical papilla; 



the uterus. ^^•' esophagus; int., intestine; 1. m. , 



mi i- 1 1 ^r>^ • lateral membrane; 1. p., lateral cir- 



The freed embiyos measure 230 mi- eumoral papilla; m. c, mouth collar; 



crons in length. n. r., nerve ring. (After Ransom, 



Parasitic in the large intestine of the ?"ii- i^o- 127, Bureau An. Ind.. 



, , ^ ^ U. S. Dept. Agr.). 



sheep and goat. 



2. CEsophagostomum venulosum. Fig. 148. Strongylina? (p. 280). 



kJ^ — The thickness of the body is nearly uniform over its greater portion, 



' \.--' attenuated toward ends. The anterior end is usually straight. The 



^J^ height of the cuticular collar about the mouth is about one-third of its 



diameter. The cuticle of the neck is inflated between the mouth collar 



and the cervical groove. The lateral membranes extend well back but 



.are very narrow. The bursa of the male has two lateral lobes united by a 



small median lobe. The spicules are 1.1-1.5 mm. long. The vulva of 



the female is naked and located just in front of the anus. From a short 



distance in front of the vulva the body tapers, terminating in a sharply 



pointed tip. 



The female is 18-24 mm. (23/32-15/16 of an inch) in length; male, 

 12-16 mm. (15/32-5/8 of an inch). 



The eggs are oval, 90 microns in length by 55 microns in breadth. 



