lO Franklin D. Barker and George W. Covey 



approximately spherical, in three they were only slightly elongated 

 transversely with reference to the long' axis of the body, and in 

 the remainder they were very much elongated transversely. The 

 following are the measurements: maximum length 0.216 mm, 

 width 0.366 mm ; minimum length 0.059 "''"''' width 0.059 mm ; 

 mode for the length 0.118 mm, 0.106 mm and 0.089 ^im for 15.3 

 per cent. ; mode for the width 0.118 mm for 23.0 per cent. 



The cirrus pouch (figs, i and 8) lies anterior to the acetabulum, 

 in no case reaching posterior to its posterior border. Its base is 

 always near the acetabulum, in nine of the fourteen lying over 

 the center of it. In the other five, the base was slightly to the left 

 of the acetabulum in one, to the right in three, and could not be 

 distinctly seen in the fifth. From the base, the pouch extends in 

 a twisted course cephalad and toward the left, passes ventral to 

 the left caecum of the intestine, and ends in a genital papilla 

 (figs. I, 3 and 8) on the dorsal surface of the body at the level of 

 the posterior end of the esophagus, approximately 0.045 ^""^"^ 

 from the left lateral border of the worm. The length of the 

 cirrus pouch can only be approximated on account of its coiled 

 course. It is about 0.413 mm long (average). The diameter of 

 the pouch in cross-section at the base is 0.041 mm. From here it 

 becomes gradually narrower and narrower, being 0.024 mm in 

 diameter near the genital pore. At the base of and within the 

 cirrus pouch is a large seminal vesicle (fig. i). From the seminal 

 vesicle a narrow tube, the pars prostatica, leads to the terminal 

 portion or cirrus. The seminal vesicle and pars prostatica are 

 surrounded by the cells of a well defined prostate gland which 

 completely fills the basal portion of the cirrus pouch. 



The ovary lies approximately at the junction of the first and 

 second thirds of the body in the median longitudinal axis and is 

 considerably smaller than the testes. It varies in shape from 

 orbicular to oval and has a smooth margin. The length varies 

 from 0.035 "''"'' ^o 0.089 I!''"'' with a mode of 0.059 ^^ ^^^ 

 0.088 mm for 25 per cent. ; the width varies from 0.041 mm to 

 0.089 "^"''j w'ith a mode of 0.059 ^oi" 25 per cent. 



Just posterior to the ovary, a little ventral to it, and slightly 

 to the left of the mid-longitudinal axis, lies a rather large ovoidal 



202 



