OUR DOMESTICATED ANIMALS. 



79 



These may be enumerated briefly as the twisted strongle 

 {Strongylus contortus), itself capable of producing an 

 epizootic; the slender-necked strongle (Str. filicoUis) ; 

 the bent strongle (Dochmius cernuus) ; and the rigid 

 strongle (D. hypostomus). In addition to the strongles 

 we find the common whipworm of ruminants, or Tricho- 

 cephalus affinis, in great abundance ; and, as I have 

 already shown, it appears to be capable of producing 

 severe symptoms in the ovine bearer. In the illustration 

 (Fig. 16) the letters a and b severally refer to the male 



Fig. 16. The "Whipworm of Ruminants. 



and female worms of the natural size, whilst c gives a 

 highly magnified view of the head and neck ; the spirally 

 curved tail of the male parasite being represented at d, 

 with its long and sheathed spicule protruding from the 

 cloacal outlet. 



A species of Ascaris has been described as occurring in 



