288 PARASITES OF THE DOMESTIC ANIMALS 



is situated a little in front of the anus. From in front of the vulva the 

 body gradually attenuates, the tail terminating behind the anus in a 

 sharply pointed tip which is bent dorsally. 



The female is 17-20 mm. (11/16-3/4 of an inch) in length; male, 13- 

 14 mm. (1/2 an inch). 



The eggs are oval, 90-100 microns in length by 50 microns in breadth. 

 They are segmented within the body of the female. The eggs have 

 similar characters to those of other sclerostomes, and it is probable that 

 the evolution external to a host is the same. 



Occurrence. — Strongylosis of the large intestine of sheep due to this 

 species is probably more prevalent in Europe than in the United States. 

 In reference to the species, Hutyra and Marek state that it is often 

 found in the colon of sheep, goats, and deer, inducing in some cases 

 intestinal hemorrhage and diarrhea followed by anaemia and emaciation 

 which may cause considerable loss among the young animals. 



Neveu-Lemaire speaks of strongylosis of the large intestine of sheep 

 as at times ravaging certain flocks in the form of an epizootic. 



Ransom, in United States Bureau of Animal Industry, Bulletin No. 127 

 (1911), refers to Chahertia ovina as follows: "This species appears to be 

 comparatively harmless. Its food consists of the vegetable material in 

 the contents of the large intestine. The buccal capsule is commonly 

 found filled with such material." 



Strongylosis of the Intestines of the Horse. Sclerostomiasis 



1. Strongylus equinus (St. armatus; Sclerostomum equinum). 



Fig. 155. Strongylinie (p. 280). — The body is straight, rigid, and finely 



striated transversely; color gray or grayish brown, or 



^ r\ ^^ ^^^y ^-*^ shaded with red according to the amount 



i 1/ o of ingested blood. The mouth is distended by several 



chitinous rings the innermost of which are provided 

 with an armature of fine teeth, while the outermost 

 have six papillae. The buccal capsule has three teeth 

 at its base. The bursa of the male has two lateral 

 lobes between which is a smaller median lobe ; spicules 

 long and slender. The vulva of the female is located 

 near the posterior third of the body. The tail is obtuse. 

 The length of the female varies from 20-55 mm. (3/4 

 to 2 3/16 inches) ; that of the male from 18 to 35 mm. 



T. 1.. .. (11/16 to 1 3/8 inches). 



Fig. 155— Stron- ^ ' ' i „o • • i -i-i, i r < • 



gylus equinus; male The eggs are oval, 92 microns m length by 54 mi- 

 at right, female at crons in breadth. Segmentation commences at the 

 left, — natural size ^- £ ^j j^. ^leposition. The hatched embryos meas- 



(drawn from speci- . • i i 



mens). ure 340-500 microns in length. 



