The material studied consists of 50 specimens mounted in toto and 8 specimens cut in cross, frontal, oblique and sagittal sections. Since living specimens are not available, and since the large number of eggs covers up most of the internal structures, much of the present study was done on serial sections. The trematode is ovate, flattened dorso-ventrally in the anterior half, often somewhat concave on ventral surface; body 0.385-0.472 long by 0.184-0.230 wide, with an average of 0.207 by 0.425, greatest width being often at posterior half; cuticle spiny, spines less conspicuous towards posterior end. Oral sucker terminal, 0.026-0.062 long and 0.026-0.059 wide, average 0.044-0.047; acetabulum distinctly smaller, 0.033-0.043 in diameter, average 0.037, located at almost posterior third of body; genital opening large, somewhat oval in shape, placed to left of acetabulum. Mouth, surrounded by oral sucker, opens into a narrow prepharynx, 0.023 long; pharynx globular, 0.025 long and 0.0245 wide; esophagus slender, 0.106 long and 0.009 wide; intestinal bifurcation at about middle of body; ceca large and short, 0.1 long by 0.024 wide, ending in front of or at level of acetabulum. Reproductive organs mostly covered by enormous number of eggs; tests two, about 0.05 in diameter, post-acetabular, lying against dorsal wall of body, somewhat obliquely placed opposite each other. From each arises a vas efferens, left one being longer. A short vas deferens leads to an inverted V-shaped seminal vesicle, 0.056-0.082 by 0.036-0.059, average 0.067 by 0.048, placed conspicuously in front of acetabulum, just behind intestinal bifurcation. Prostate glands well developed, surrounding distal portion of seminal vesicle and the short prostatic section; prostate gland mass measures 0.03-0.049 by 0.014-0.039, average 0.039 by 0.028. The prostatic section continues on to form a small but long ejaculatory duct surrounded by a large muscular structure, the male papilla. The latter is bounded on its ventral side by a large and somewhat curved muscular flap, which guards the entrance of the genital pore and is here termed a pseudogonotyl. The male papilla and pseudogonotyl are fused together at their bases. The male papilla narrows and bends dorsally much like a hook, with the male opening at the end. The genital sac, holding the two muscular structures, is spacious. Viewed either dorsally or ventrally, without taking into consideration the distal curved part, the papilla appears as a broad structure, measuring 0.059-0.076 by 0.04-0.053, average 0.069 by 0.047. However, in sections it is about 0.085 in entire length. The pseudogonotyl from the same views measures 0.04-0.056 by 0.013-0.026, average 0.051 by 0.02. Ovary oval, 0.049-0.066 by 0.04-0.053, average 0.059 by 0.041, somewhat transversely placed just in front of right testis, lying close against the right cecum, near dorsal body wall at about the same level as acetabulum; seminal receptacle not observed. Oviduct turns downward, and at posterior level of testes it turns upward to become the o6type surrounded by Mehlis' glands. The latter mass measures 0.015 by 0.019, located dorsally somewhat on right side and slightly behind testes. Vitellaria in two groups, ventral to male genital glands, between which are the common vitelline duct and the yolk reservoir. Uterus voluminous, containing numerous eggs, occupying entire posterior region up to the tip of the cecum on the right and the posterior limit of genital sac