218 BARKER. 



nearly to the distal end of the pouch. Fine ducts leading from the 

 prostate cells occupy the medullary portion of the pouch and enter the 

 prostatic duct. The lumen of the cirrus is lined with cuticula, while the 

 lumen of the prostatic duct is covered with high filamentous papillae. 



The Avail of the cirrus pouch possesses a heavy outer sheet of longi- 

 tudinal muscle fibers and a thin inner one of circular fibers. The 

 cirrus, which is approximately one-fifth the length of the cirrus pouch, 

 has an outer and an inner muscular component. The outer compo- 

 nent comprises an outer sheet of longitudinal muscle fibers and a 

 heavier inner sheet of circular fibers. The inner muscular component 

 immediately surrounds the lumen of the cirrus and the prostatic duct 

 and is likewise composed of an inner sheet of circular muscle fibers 

 and an outer sheet of longitudinal fibers. The cirrus pouch is anchored 

 and possibly controlled by a pair of oblique muscles which are attached 

 respectively to the cephalic and caudal faces of its base. 



The cirrus opens into a common genital atrium, which has its out- 

 let in the genital pore lying in, or a little to the left of, the median line 

 and slightly anterior to, or just under, the anterior margin of the 

 acetabulum. 



Female genitals. — -The ovary (PI. I, Figs. 1, 5, 6, PI. II, Fig. 7) lies 

 near the middle of the body, in the median area, dorsal to the posterior 

 portion of the acetabulum and is from one-half to two-thirds the bulk 

 of one of the testes, globular in general form with undulating or 

 slightly lobed outline. In the specimen figured (Fig. 5) it measured 

 0.38 mm. by 0.38 mm. 



The oviduct leaves the ovary from the middle of its anterior margin 

 and at once turns sharply mediad; after making several loops it passes 

 caudad in descending transverse coils, lying a little to the right of the 

 median plane, to the end of the body, where, turning, it winds cepha- 

 lad, a little to the left of the median plane, in ascending transverse 

 coils; the terminal portion passes between the testes and thence to 

 the left and dorsally over the acetabulum ; finally it turns to the right 

 and crosses obliquely the distal third of the cirrus pouch (PI. I, Fig. 3), 

 where it enters a well defined metraterm or vagina. The base of the 

 metraterm is enlarged and lies across the left side of the terminal 

 portion of the cirrus pouch, but the neck parallels the pouch and ter- 

 minates anteriorly and to the left of the pouch in the common genital 

 atrium. The wall of the metraterm is thickened and supplied with an 

 inner sheet of circular muscle fibers and an outer sheet of longitudinal 

 fibers. An invagination of the cuticula appears to form the lining of 

 its lumen, the wall of which is transversely ridged. 



