12 Franklin D. Barker and George W. Covey 



a straight tube. Just anterior to the acetabulum it turns slightly 

 to the left and meets the cirrus pouch near its base. From this 

 point it runs parallel and also posterior and ventral to the cirrus 

 pouch and finally opens at the base of the genital papilla and 

 internal to it (figs, i, 3, 8). 



The number of eggs varies from two to a very great number, 

 being confined almost entirely to that portion of the uterus poste- 

 rior to the ovary. The eggs are long ovals in shape with the 

 opercular pole more flattened than the opposite pole. They have 

 a well-marked operculum but are without filaments (fig. 6). 



Their length varies from 0.053 mm to 0.040 mm. with a mode 

 of 0.051 and 0.053 ^T^"^ for 23 per cent.; their width varies from 

 0.020 mm to 0.026 mm with a mode of 0.023 mm for 53.9 per cent. 



The yolk-glands are arranged in two lateral fields, outside the 

 intestinal caeca, reaching from a point just posterior to the ovary 

 to a point just a little anterior to the anterior testis. The right 

 gland is always a little shorter than the left. The acini are not 

 arranged in definite groups, but are more or less irregular. The 

 vitelline ducts pass medially dorsal to the intestinal caeca to reach 

 the yolk reservoir (fig. 8). 



The excretory system consists of a large median reservoir, 

 which begins slightly posterior to the ovary and extends to the 

 anterior testis, lying between the two intestinal caeca and dorsal 

 to the uterus. The median reservoir branches just posterior to 

 the ovary into two tubes, one of which passes forward on either 

 side of the ovary and both of which end just a little anterior to 

 it. The left branch is usually a little longer than the right. From 

 the median bladder very small lateral branches are given ofif, 

 which radiate in all directions, branching and re-branching until 

 they reach the cuticula. At the anterior testis the central bladder 

 becomes contracted into a duct, which passes dorsal to the testes, 

 as may be seen in both sagittal and cross-sections. Posterior to 

 the testes it becomes again distended into a second bladder, 

 which opens to the exterior through the excretory pore at the 

 extreme posterior end of the body (fig. 8). 



204 



