A NEW INTESTINAL TREMATODE OF MAN. 389 



cirrus pouch the cirrus is more or less coiled or looped and provided 

 with a well developed musculature and a glandular envelope (pars 

 prostatica). In each of the specimens, the cirrus is extruded through 

 the male genital pore and externally is curved in from one to two spiral 

 turns. 



Female organs. — The ovary is globular and situated at just about the 

 center of the body length, slightly to the right of the median line. Pos- 

 terior to the ovary, and filling the space between it and the anterior testicle 

 is a well developed, globular shell gland. The vitellaria extend anteriorly 

 to or slightly behind the junction of the anterior with the middle third 

 of the body length or to a plane about midway between the proximal 

 borders of the ovary and acetabulum. Passing posteriorly, they conform 

 closely to the lateral margins and extend slightly upon the ventral and 

 dorsal surfaces, so that on cross section they give the form of a crescent, 

 in the convexity of which lie the intestinal caeca. After passing caudad 

 of the testicles the vitellaria quickly spread across the dorsal surface and 

 meet in the median line, at the same time encroaching more gradually 

 upon the ventral surface until, in the extreme posterior portion of the 

 body they meet in the median line ventrally also and completely encircle 

 the body, enclosing the extremities of the caeca and excretory tract. The 

 transverse vitello-ducts cross the sub-lateral fields (excretory tracts) at 

 the level of the anterior border of the anterior testicle, almost at right 

 angles to the longitudinal axis of the body and enter the postero-lateral 

 borders of the shell gland. Laurers canal present. Receptaculum 

 seminis absent. The coils of the uterus are fairly developed, extend on 

 the left side as far back as the shell gland, and fill the median field 

 between the ovary and acetabulum, being bounded laterally and separated 

 from the caeca by the broad excretory tracts. The anterior extremity of 

 the iiterus continues into the well developed vagina which passes forward 

 dorsad of the acetabulum directed slightly toward the left and opens at 

 the female genital pore, separate from and situated just to the left of 

 the male pore, the two pores being about midway between planes passed 

 through the anterior border of the acetabulum and the posterior border 

 of the pharynx respectively and just behind the bifurcating intestinal 

 casca. The site of the genital pores is marked by the transverse depression 

 in the ventral surface above mentioned as more or less distinctly sepa- 

 rating the cephalic extremity from the remainder of the body. 



Ova. — The ova are not very numerous. The shell is thin, light brown 

 in color, with an operculum at the smaller end. In the faeces the egg- 

 contents are colorless and composed of a number of ill-defined vitellogen 

 cells among which the ovic cell could, with difficulty, be detected in 

 some eggs. The ova, in fresh faeces, vary considerably in size and also in 

 their relative length and breath, some being shorter and thicker than 



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