Plate XIII. 
ae Rs 
Fig. 1—Heifer infested with lung worms and live 
flukes. Note emaciation and edema, 
Fig. 2—Ocsophagostoma Cou 
lumbiaoum. 
(Cephalic extremity). 
a, Oral cavity. 
b, Oesophagus. 
ec, Papillae. 
Fig. 3—Oesophagostoma Co- Fig. 4—Gesophagostoma Co. 
lumbianum. lumbianum. 
(Caudal extremity of male). (Caudal extremity of fe- 
a, Rib of caudal pouch, male). 
b, Web. a, Vulva. 
e, Spiculae. b, Anus, 
