250 L. B. SEELY. 



The excretory vesicle, which is tubular and in cross-section 

 about the size of one of the intestinal caeca, is extremely long. 

 The median portion extends from the excretory pore, which is 

 terminally located at the posterior extremity, to a position just 

 posterior to the acetabulum. Here it branches, forming the two 

 crura, which extend outward and forward to about the plane of 

 the posterior end of the cesophagus. The excretory vesicle is 

 extremely thin-walled, and almost impossible to be seen except 

 in sections. It is dorsal in position throughout its entire extent. 



The testes are two large, very prominent organs just posterior 

 to the middle of the animal. They are irregularly ovate in out- 

 line and are somewhat lobed. They do not both lie in the same 

 plane, the left one usually being posterior to, but overlapping, 

 the right. The posterior one is usually somewhat longer than 

 the anterior, being 1.4 mm. long, while the anterior one is I.I 

 mm. long. Each is about .92 mm. wide and about .78 mm. 

 thick. The vas deferens from the left testis runs forward to the 

 left of the right testis, lying between it and ovary. Just anterior 

 to the shell gland it is joined by its fellow from the right testis, 

 and from here a slightly convoluted tube extends to the genital 

 pore. There is no cirrus or cirrus sac. The genital pore is a 

 minute opening on the ventral side, in the same transverse plane 

 as the pharynx and to the right of the median plane. 



The ovary is a somewhat elongated organ considerably smaller 

 than either testis. It is usually on the left side and slightly pos- 

 terior to the acetabulum. Occasionally it is on the right side, 

 and when it is so placed the testis on that side is posterior to the 

 other. It is about .7 mm. in length, .32 mm. in width, and .32 

 mm. thick (dorso-ventrally). The oviduct runs from the ovary 

 into the shell-gland where there is an ootype. The shell-gland 

 lies in the middle of the body just posterior to the acetabulum. 



The receptaculum seminis is a sac about one-half as large as 

 the ovary. It lies just forward of and lateral to the right testis. 

 Its duct runs forward and to the left, meeting the oviduct at its 

 entrance into shell gland. There is no Laurer's canal. 



The yolk glands are numerous, being placed in clusters along 

 both sides of the body from the position of the pharynx to the 

 posterior extremity of the hinder testis. There are five or six 



