Taenia solium, or the armed tapeworm, when fully developed, is from two to three metres long. Its head is of pinhead size and spherical in shape. It has four cuplike suckers, in the middle of which is situated the rostellum, the latter being surrounded with a large number of hooks (Fig. 42). These are arranged in two rows and number from twenty-four to twenty-six. Succeeding the head is a filiform neck, almost an inch long. Commencing at a certain distance from the head the body is divided into segments. The mature proglottides are 1 to 1.5 cm. long and 6 mm. wide. The genital opening is situated at the side near the posterior border of the segment (Fig. 43). The uterus forms a straight median tube, giving off at right angles five to seven branches on each side. These branches are undivided at first, but toward the periphery ramify in the form of a tuft (Fig. 44). The eggs are round and provided with a thick shell.

Head of Taenia Solium with Protruding Rostellum

Fig. 42. - Head of Taenia Solium with Protruding Rostellum. Magnified 50 diameters. (Ziegler.)

Half Developed and Fully Matured Segments

Fig. 43. - Half Developed and Fully Matured Segments. Natural size. (Leuckart.)

Taenia solium inhabits the small intestine of human beings. The further development of the embryo into measles occurs in the intermediary host, the pig, in which condition they reach the human system and are transformed into mature taenias. Rarely the measles (cysto-cercus cellulosae) are found in men, in which instance they occur in various organs, brain, eye, skin, etc. The gravity of the disease which they produce depends upon the importance of the organ they involve.

Taenia Solium

Fig. 44. - Taenia Solium. Showing two proglottides. A, A, pores. (Huber.)