eggs of tapeworms of the genera Multiceps and Echinococcus are 
quite similar in structure. In view of the overlapping of the egg 
sizes of tapeworms in this group, it is not usually feasible to make 
a definite diagnosis in regard to the species of tapeworm present, but 
Fig. 4. Dipylidium caninum. Egg capsule. Enlarged. From Stiles, 1903. 
such a diagnosis is usually unnecessary anyway. The following figures 
cover briefly the eggs of some of the dog, cat and fox tapeworms. 
Taenia taeniaeformis (T. crassicollis) of cats, spherical, 31 to 37 
microns in diameter; T. pisiformis (T. serrata) (Fig. 1) of dogs and 
Fig. 5. Dipylidium caninum. Egg. Magnified. From Railliet, 1893, after Moniez. 
foxes, elliptical, 37 by 34 microns; T. hydatigena (T. marginata) 
(Fig. 2) of dogs, elliptical, 38 to 39 microns by 34 to 35 microns; T. 
ovis of dogs, 30 to 34 microns by 24 to 28 microns; Multiceps multi¬ 
ceps (T. coenurus) of dogs, spherical, 29 to 38 microns; M. serialis 
Fig. 6. Mesocestoides lineatus. Eggs, x 300. From Railliet, 1893. 
(T. serialis) of dogs, elliptical, 31 to 34 microns by 29 to 30 microns; 
Echinococcus granulosus (T. echinococcus) (Fig. 3) of dogs and cats, 
elliptical, 32 to 36 microns by 25 to 30 microns. 
The eggs of Dipylidium have two thin shells and are contained in 
19 
