(Fig. 57); D. friedbergeri (turkey), 34 to 38; D. bothrioplitis (chicken), 
25 to 40; D. echinobothrida (chicken; U. S.), 25 to 50; D. cesticillus 
(chicken, turkey, guinea fowl; U. S.), 36 to 42 (Fig. 58), according to 
some writers, or 65 by 50, according to others; D. microcotyle (duck), 
40; D. vigintivasus (chicken), 55. 
The family Anoplocephalidae is represented by the species Bertiella 
delafondi parasitic in the intestine of the pigeon. The egg (Fig. 59) 
of this worm has 2 thin shells outside of the onchosphere and is 55 to 
Fig. 56. Davainea proglottina. Egg. Enlarged. From Stiles, 1896, after Blanchard. 
65 microns in diameter; the piriform apparatus, noted in a previous 
paper as present in eggs of cattle tapeworms belong to this same fam¬ 
ily, Anoplocephalidae, is not present. 
The family Fimbriariidae is represented by the species Fimbriaria 
fasciolaris, parasitic in the duck and goose. The egg has thin shells 
Fig. 57. Davainea tetragona. Egg. Enlarged. From Lopez Neyra, .1920. 
and is 37 to 45 microns long by 21 to 23 microns wide. 
The eggs of nematodes belonging to the superfamily Spiruroidea 
are usually elliptical and contain embryos when deposited. Most of 
the following species occur in the digestive tract, usually embedded 
more or less in the tissues. Oxyspirura mansoni and O. parvovum 
53 
