The eggs of nematodes belonging to the superfamily Strongyloidea 
are usually thin-shelled and elliptical and are usually segmenting when 
deposited. The dimensions in microns of some of the eggs of worms 
Fig. 59. Bertiella delafondi. Egg. Enlarged. From Johnston, 1918. 
in this superfamily are as follows: Trichostrongylus tenuis (chicken, 
duck, goose; cecum), 66 to 75 by 35 to 42; Ornithostrongylus 
quadriradiatus (pigeon; intestine; U. S.), 70 to 75 by 38 to 40; 
I-1 
50/ia. 
Fig. 60. Oxyspirura mansoni. Eggs. From Ransom, 1904. 
Epomidiostomum orispinum (goose; esophagus and proventriculus), 
95 by 55; E. anatinum (duck; gizzard), 74 to 80 by 48 to 50; Syngamus 
trachealis (chicken, turkey, peafowl; U. S.), 85 to 90 by 50, with 
55 
