45 to 60; H. columbae (pigeon), 36; H. collaris (duck, goose), 42 to 44; 
H. megalops (duck; U. S.), 45 to 57; H. venusta (duck), 47 by 30; 
H. sagitta (duck), 44 by 34; H. setigera (goose), 53 by 28; H. 
fedtschenkowi (chicken), 75 by 50; Drepanidotaenia lanceolata (goose, 
Fig. 53. Drepanidotaenia lanceolata. Egg. x 300. From Stiles, 1896, after Railliet. 
duck), 50 by 35 (Fig. 53); Monopylidium gallinarum (chicken), 35; 
Amoebotaenia sphenoides (chicken; U. S.), 42 (Fig. 54); Metroliasthes 
lucida (turkey, chicken, guinea fowl; U. S.), 75 by 50 (Fig. 55). 
Fig. 54. Amoebotaenia sphenoides. Egg. x 374. From Meggitt, 1914. 
The eggs of tapeworms belonging to the family Davaineidae also 
have thin, transparent shells or membranes and are very similar to 
those of tapeworms belonging to the Hymenolepididae. Those of 
poultry tapeworms are usually globular or subglobular, but sometimes 
Fig. 55. Metroliasthes lucida. Egg. x 758. From Ransom, 1900. 
elliptical. The diameters of the eggs are given here in microns for 
the following species: Davainea proglottina (chicken; U. S.), 35 to 40 
(Fig. 56); D. tetragona, chicken, turkey, guinea fowl; U. S.), 25 to 50 
52 
