On a New Species of Trematode (Prohemistomum serpentum n.sp.) from a Snake, with a Note on an Immature Species of Heterechinostomum Odhner from the Cat

Description. Body more or less elongated, narrowing anteriorly and posteriorly. Length 1·34–1·441, maximum width 0·476, maximum thickness 0·433, both measured in the region of adhesive apparatus. Entire surface of the body, except adhesive apparatus and the region posterior to second testis, covered with fine spines. Ventral folds originate approximately at centre of body and meet a little behind the level of posterior third to form a shallow cavity occupied by the adhesive apparatus. Adhesive apparatus smooth, oval, 0·4–0–44 long, 0·26–0–3 wide, with narrow central depression, anteriorly reaching acetabulum and posteriorly anterior margin of posterior testis. In it are imbedded vitelline follicles, anterior testis, ovary and anterior portions of cirrus sac and uterus.