ELISHA MITCHELL SCIENTIFIC SOCIETY, 95 



The generative organ is paired, the long slender tester lying on 

 either side of the alimentary canal reach by their free anterior 

 ends to about the middle of the body. See Fig. 21^;, Plate IV. 

 Some little distance from the caudal end of the body they unite 

 into a common canal, which itself near the spicules unites with 

 the alimentary canal, forming the cloaca. The spermatozoa are 

 spherical. The cellular structure of the testes resembles that of 

 the ovaries to some extent. The cells are polyhedral, and in 

 side view the lines separating them are zigzag. See Fig. 21:3;, 

 Plate IV. 1\\ live males the spherical spermatozoa are easily 

 seen at and near the common passage, but they are developed in 

 the anterior ends of the testes. By boiling infested potatoes to 

 soften them so that I could remove the cysts and mature males 

 without cutting or mashing them, I found that it toughened the 

 tissues of the animals, and made the cellular structure very dis- 

 tinct. I possess several microscopic mounts of the males and 

 one with the male in the act of coming from its cyst. 



Development of the Female. — About the time the cysts 

 have reached the stage when the male begins its transformations 

 it is quite easy to distinguish the female cyst. The alimentary 

 canal is very large and up to this time in both sexes has occupied 

 nearly the entire cavity of the cyst. Now it begins to deterio- 

 rate and the ovaries l)egin to come to maturity while the cyst con- 

 tinues to enlarge. While the female cyst still possesses the 

 slender tail process*, tiie irregular, slender hyaline cornua of the 

 generative organs may been seen one on either side of the large 

 intestine, which is covered with fat globules and is quite opaque, 

 or more so than the genital tubes. See Figs. 19 and 192;^ Plate 

 IV. The vulva, the opening for the uterus, is at the point in 

 these figures where the tail process joins the cyst. The cyst con- 

 tinues to enlarge, or "swell," until the tail part is cast and thrust 

 aside. The vulva is now at the posterior end, and in some cases 

 the body is so much enlarged that a depression is formed at this 

 point (see Fig. 27, Plate IV). The ovaries continue to elongate; 

 and fertilization takes place long before the cyst has ceased enlarg- 



*Probably the remains of the second moult. 



