stomach of cattle, and Avitellina centripunctata is reported from the 
stomach of cattle and the small intestine of sheep. 
The eggs of tapeworms belonging to the genus Moniezia are thin- 
shelled and the embryo has, in place of the radially striate embryophore 
of the taenioid cestodes, a special structure called the piriform ap¬ 
paratus. In its most highly developed condition this consists of a 
central bulb surrounding the onchosphere, with two so-called horns 
extending from the bulb and terminating in a disk. The diameter of 
the eggs of some of the commoner species of Moniezia are as follows: 
Fig. 29. Fasciola hcpatica. Egg containing embr/o, or miracidium. Enlarged. 
From Fiebiger, 1912, after Csokor. 
M. expansa, 50 to 60 microns; M. planissima (Fig. 28), 63 microns; 
M. trigonophora, 52 to 60 microns. The eggs of Thysanosoma 
actinioides are 70 to 105 microns long by 35 to 58 microns wide; the 
piriform body is without horns in this species. In examining feces of 
ruminants for evidences of tapeworm infestation, it appears probable 
that one will usually find gravid segments containing the eggs of the 
tapeworms present rather than free eggs released from the segments. 
The gravid segments of Moniezia are wider than long; those of Thy¬ 
sanosoma tend to show a triangular outline when viewed dorso-ven- 
34 
