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 foi 34 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 e.xternal 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 300 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). 



