. Fig-. 155.—Isolated en- cj^sted cercaria of the common liver fluke. • X 150. (After Leuc- kart, 1889, p. 286, Fig. 142.) generation (cercariae) escape. The posterior portion of the w^orm is pro- vided, at about the border of the third and the last fourths of the body, with two projections. There is a mouth with pharynx situated at the anterior extremity, the pharynx leading to a simple blind intestinal sac. The redia, as well as the sporocyst, may be looked upon as a female organism, and in its body cavity are found a number of germ cells, which develop into individuals of the next generatio
. Fig-. 155.—Isolated en- cj^sted cercaria of the common liver fluke. • X 150. (After Leuc- kart, 1889, p. 286, Fig. 142.) generation (cercariae) escape. The posterior portion of the w^orm is pro- vided, at about the border of the third and the last fourths of the body, with two projections. There is a mouth with pharynx situated at the anterior extremity, the pharynx leading to a simple blind intestinal sac. The redia, as well as the sporocyst, may be looked upon as a female organism, and in its body cavity are found a number of germ cells, which develop into individuals of the next generation, known as— (/) CercaricE (Figs. 153—155).—These organisms are similar to the adult parasites into wdiich they later develop. The body is flat, more or less oval, and provided with a tail inserted at the posterior extremity. The oral sucker and acetabulum are present as in the adult, but the intestinal tract is very simple; on the sides of the body are seen two large glands, but the complicated genital organs of the adult are not visible, The cercaria leaves the redia through the birth opening, remains
Size: 2226px × 2244px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkwrjenkins
