Tremarctos (tremarktos)

[NL., IMG:content-0814.jpg:[graphic] IMG:content-0815.png:[merged small][ocr errors][merged small][merged small][ocr errors][merged small][merged small] Asp i do gaster conch i cola, one of the Trematoda, in profile outline, to show alimentary and reproductive organs. a, mouth; b, muscular pharynx; c, stomach; d, germarium; e, internal vas deferens; f. common vitellarian duct; g, vitellarium; i, k, oviduct; 4, uterus; m, testis: 0, vagina;, penis, continuous posteriorly with external vas deferens. They mostly have a flattened and more or le chitin i zed body, and a pair or more of suckers for adhering to the ti ues of the host. Most trematoids are hermaphrodite or monœcio us, but some are diœcio us, and all undergo a series of transformations comparable to those of tapes. The well-known liver-fluke of man, Distoma hepaticum, is a characteristic example. (See cercaria, Distoma, fluke2, hydatid, redia, and sporocyst.) When the order is raised to the rank of a cla , as is done by some, the mono gene ous and digeneous suborders become subcla es, and the current families are regarded as orders, as Tristoma and Poly stoma of the former division, and of the latter Mono stoma, Distoma, Gast eros tom a. and Holostoma. Also Trema to i dea, Trematode a, and Trematoid a. The Century Dictionary and Cyclopedia: The Century dictionary IMG:content-0817.png:[blocks in formation]