82 



DISEASES OF THE DIGESTIVE APPABATUS. 



its head is like a bell-shaped capsule having two small, curved 

 teeth on its dorsal border and four teeth on its ventral border. 

 By means of the bell-shaped disk and the teeth on the inner part 

 of its mouth it sucks and buries into the mucous membrane of 

 the intestine and sucks blood. The three forms of this parasite 

 found in the small intestine of the dog and described are as fol- 

 lows: the dochmius duodenalis; the male is 10 mm. long and 1 mm. 

 thick; the female is 12 to 18 mm. long; the dochmius trigono- 

 cephalus; the male is 8 mm. long and 0.3 mm. thick; the female 

 is 12 mm. long and 0.6 mm. thick; and the dochmius stenoceph- 

 alus; the male is 6 to 8 mm. long and 0.24 mm. thick; the female 

 is 8 to 10 ram. long and 0.38 mm. thick. 



"Fig. 29 



Dochmius duodenalis : a, male ; 6, female (natural size) ; c, magnified head. (Jaksch.) 



Animals affected with this parasite become anaemic, weak, and 

 thin, and have a peculiar discharge of a thin, bloody mucus from 

 the nose (M6gnien, E,aillet). 



The presence of this parasite is recognized in the same way as 

 one would locate the tajnia — by the presence of the eggs in the 

 feces. They are easily recognized, the eggs being similar to the 

 ascarides. 



Besides the already mentioned parasites we also find in the intes- 

 tines the trichocephalus depressiusculus in the ceecum and ihe both- 

 r:ocephalus latus, cordatus, fuscus, reticulatus, and bubius in the 

 small intestines; and we also find a coccidium (the coccidium per- 

 forans), which may produce a diphtheritic inflammation of the 

 intestines (Eivolta and the author). They have been known in 

 rare instances to produce rabiform symptoms. 



