T78 



THE FARM DOCTOR. 



portion of the body of the last is about an inch long, the other 

 round worms are mostly under an inch and a half. The taj e- 

 worm is usually three feet or under, but is alleged to gain i\ 

 length of twenty, thirty, and even one hundred feet. 



Swine suffer severely from a thorn-headed worm (Echin- 

 orynchus Gigas) from three to eighteen inches long; a hair- 



FiG, 32. 



Fig. 



33- 



Fig. 34. 



Fig. 2,1. Fig. 36. 



Fig. 32. — Head of Dog's Tape-worm (T. Cucumerina). Larval fomi in the 

 dog-louse (Trichodectes Cani). Fig. 33. — Head of Dog's Tape-worm ( f. 

 Marginata). Fig. 34. — Cyst of same (Cysticercus Tenuicollis), infests rumi- 

 nants, omnivora, etc. Fig. 35. — Ascaris Marginata, nat. size. Fig. 36. — 

 Ascaris Mystax, nat. size. 



headed worm (Tricocephalus Crenatus) a little smaller than the 

 ruminant's; an ascaris (A. Suilla) like that of ruminants; the 

 Sclerostomum Dentatum, three to five lines in length, and the 

 Trichina Spiralis, one-eighteenth to one-sixth inch long. 



