SYNGAMUS TRACHEALIS. 



EXPLANATION OF FIGURES. 



Fig. 1 — Adult male and female Syngamus, (enlarged 133 diameters). A, male; B, female, show- 

 ing the head, oesophagus and intestine In the female may be seen the uterus and ovarian 

 tubes filled with eggs. 



Fig. 2. — Embryo of Syngamus removed from the earthworm and kept fo; 24 hours in an incubator, 

 in the blood serum of a calf, at 105° Fahrenheit. About moulting the first time, (enlarged 

 200 diameters). 



Fig. 3. — Smallest pair of Syngami ever seen; male .035 and female .055 inch in length. Found on 

 the external wall of the oesophagus of a chick, (enlarged 172 diameters). 



Fig. 5. — Egg of Syngamus immediately after passing out of adult female, (enlarged 318 diameters). 



Fig. 6.— Embryo of Syngamus as found in the earthworm. Length .0118 inch, breadth at middle 

 .00078 inch, (enlarged 200 diameters). 



Fig. 7. — Embryo emerging from the egg, tail first, not a common occurrence. Body constricted 

 in passing out through the valvular opening, (enlarged 318 diameters). 



Fig. 8. — Egg in the mulberry state, (enlarged 318 diameters). 



