The Proglottides are broader than long and the uterus, instead of being branched, consists of a tube coiled upon itself in the center.

Fig. 113. - Tenia Echinococcus; Enlarged (Mosler and Peiper).

Fig. 114. - Development of Ovum. X 90 (Leuckart).

a, Suspended heads; b, primary rudiment of head; c, further development; d, intussusception of head; e, later budding.

The genital pore is on the flat side of the segment, and always on the same side of the worm.

The eggs are oval and possess a shell-like cover which has a hinged lid at one end. These eggs develop in fresh water into a freely moving, ciliated embryo that finally enters the digestive tract of the fish.