178 



CESOPHAGOSTOMA COLUMBIANUM, Curtice. 

 Plate XXVI. 



Fi^;;. 1. A pitco of mucous membrane t;iUcu from tbo cascum, Burfaco view, natural 

 size. The jjatch of dots scattcrrd uniformly o\'er the surface rcpreseuts 

 iutestiual glands; .the irregularly scattered larger dots and elevations are 

 the young worm tumors lu their first stages. 



Fig. 2. A .section through a worm tumor iu its younger stage : a, a, a, mucous mem- 

 brane ; 6, submucous connective tissue, in which are c arteries aud d veins ; 

 e, the tumor, which is made of connective tissue cells and their nuclei, 

 packed closely together ; near its center is the worm cavity/, with a piece 

 of the worm, which is surrounded by a section of a special capsule; out- 

 side of this is a thick membrane, formed from the surrounding material. 



Fig. 3. Small tumor dissected from the c;ecnm: a, the outside capsule filled with 

 fluid, in which is 6, a hard, cheesy mass ; c, the worm in its capsule, which 

 has been pressed out of the cavity in the mass b. This presents a more 

 advanced stage ot the disease than fig. 7, Plate XXV. 



Fig. 3a. The ruptured capsule. 



Fig. 36, The worm near the end of its second stage about to moult. 



