PARASITES IN THE RECTUM 221 



the serous and muscular coats. ^Yhen this is completed, the 

 outer tube is cut off with the scissors distal but close to the 

 row of stitches. The mucous surfaces are then approximated 

 with continuous or interrupted sutures, and the stump thor- 

 oughly cleansed with antiseptics and returned within the 

 anus. 



Should hemorrhage occur during the operation all vessels 

 should be ligated, as the persistent hemorrhage interferes 

 with the application of the sutures. The after-treatment 

 consists in the daily injection of small quantities of antiseptic 

 solutions. 



Another successful method of procedure is to insert a sound 

 of proper size, depending upon the size of the animal, into the 

 lumen of the canal; apply a tourniquet rather firmly around 

 the prolapsed portion close to the anal margin to control the 

 hemorrhage, and to prevent the wall from retracting. The 

 prolapsed portion is then amputated rather close to the 

 tourniquet. A continuous suture is applied around the 

 margin of the incised portion, the stitches placed close to- 

 gether and including enough of the tissues so that the serous 

 coats will be brought in apposition. The tourniquet and 

 sound are removed and the stump replaced within the anus. 

 Antiseptic and astringent solutions should be used for a few- 

 days. 



PARASITES IN THE RECTUM. 



Parasites in the rectum are not very numerous, although 

 one species is found inhabiting the posterior bowels. Other 

 species are found quite often in their exit from the intestinal 

 tract, especially tenife, ascarides, etc. 



The parasites inhabiting the rectum belong to the Xema- 

 toda family, Oxyuridre. The following are the ones most 

 often found : 



(a) Oxyuris vcrmicularls, found in the dog. The male is 

 2 mm. to 3 mm. long, the female 9 mm. to 10 mm., the color 

 being white and the body expanded anteriorly. 



(b) Oxyaris com par, found in the cat in the small and large 

 bowels, also in the rectum. The female is 8 mm. to 15 mm. 

 long. Same characteristics as those found in the dog. 



