ENTOZOA

(Gr. aroj, and ^toov, an animal.) A name given to an extensive series of low organized invertebrate and generally vermiform animals, of which the greater part are parasitic on the internal organs of other animals. They have colourle blood, circulated in the higher organized species in a closed system of ve els, without an auricle or ventricle; they have no respiratory organs, no articulated members for locomotion, no organs of sense. The digestive system consists either of tubes or cavities excavated in the parenchymatous texture of the body, and without an anal outlet; or of a tube with both oral and anal orifices freely suspended In an abdominal cavity. A filamentary nervous system has been recog nized in the higher organized Enlozoa, occasionally complicated with a ganglion near the mouth; the generative system is unisexual, hermaphrodite, or diascious. (For the cla ification of the Enlozoa, see Intestinal i a.) The species of Entozoa known to infest the human body are the following:— Ascaris vermicular is, Ascaris lumbricoides, Tricocephulus dispar, Botkriocephalvs lat us, Taenia solium. in the alimentary cstial; Distoma hepaticum, in the gallbladder; A cep halo cyst is endugena, Echinococcus hominis. in the substance of Hie liver, in the omentum and cavity of the abdomen; Fihiria 6ro?ichialisl in the bronchial glands; Strongyhis gigas, m the kidney; Spiroptera hominis and Strongyhis spiniger, in the urinary bladder; Poly stoma pinguicola, in the ovarium; Trichina spiral is, in the voluntary muscles; Cysticercus cellulose?, Filaria med in ens is. and Filaria oculi, in the cellular ti ue. [s. 420]