176 



CESOPHAGOSTOMA COLUMBIANUM, Curtice. 

 Plate XXV. 



o 



Fig. 1. Worm in third stage, x60: a, head, with cliUinous aimature; 6, ctioph.igns ; 

 c, intestine ; (J, unicellular glands ; e, anus; /, line denoting niitural length. 



Fig. 2. Cephalic end, lateral view, X 150 : a, cbitinous cup ; J, one of the six cephalic 

 papilliB, (these are slightly distorted) ; c, side view of the neck-fold, under 

 which the gland-ducts d, d, open on the ventral line; e, cesophagns; /, 

 intestine. 



Fig. 3. Worm in first stage when 0.23'"™. long. No internal organs were seen in 

 this specimen. , 



Fig. 4. Cephalic end, ventral view : o, head ; 6, neck-fold, near, which are the neck 

 papillse g, g; c, oesophagus; d, d, unicellular glands, which oiion under the 

 fold b; e, intestine; /,/, glands. 



Fig. 5. Worm inclosed in its cyst. 



Fig. C. Tumor from which the cyst in Fig. 5 was taken : a, surrounding tissue dis- 

 sected from csBCum ; b, fluid-filled space ; c, capsule with inclosed worm. 



Fig. 7. Older tumor. This differs from tumor of F'ig. 0, in having a movable cheesy 

 • mass. These tumors are distorted by compression, which makes them too 

 flat. Figs. 6 and 7, and Fig. 3, Plate XXVI, present three stages in the dis- 

 ease, as seen in fresh tissues under low magnifying powers. 



Fig. 8. Section of an advanced tumor: a, mucous membrane ; 6, submucous; c, inner 

 muscular layer; d, outer: e, serous membrane; /, the cheesy mass of the 

 tumor in which is a small section of the worm. This presents a more ad- 

 vanced stage of the disease than Fig. 2, Plate XXVI. 



