ELLSHA JNIITCHELL SCIENTIFIC SOCIETY. 87 



numerous fat globules on the interior of the body renders it so 

 opaque that the terminations of these tubes and their connection 

 with the body wall cannot be seen. Figs. 34 and 35, Plate VI, 

 represent such opaque cysts. In some parts of the tube, how- 

 ever, can be seen polygonal cells, the faces where they meet 

 making a zigzag line along the tube. Towards the posterior 

 end of the cyst there can usually be seen oblong bodies lying 

 within the tube or free in the body cavity. If these bodies are 

 lying on their side they resemble a bean in shape. They are the 

 eggSj and the long objects coiled within the body are the genital 

 tubes. 



Bv examininp; a 'number of mature female cvsts from the or-alls 

 of plants with soft tissues there will be found occasionally one 

 which is not very opaque, as the fat globules are less numerous. 

 Having found such a cyst we can see that the two tubes unite 

 near the j)osterior part of the body and form a common passage, 

 of a great diameter, but quite short, which extends to an open- 

 ing, the vulva. Then by f)llowing with the eye the sinuous 

 course of the tul)es in the other direcjtion the anterior ends will 

 be found lying free within the body near the anterior })ortion. 

 From the part where the tubes fork f >r nearly half their length 

 is the uterus. The anterior free ends are the ovaries; the middle 

 part functions as the oviduct and 7'eceptnculum semiyiis. Fig. 27, 

 Plate IV, represents a cyst not very opaque; d is the vulva, e the 

 uterus, and the free ends in the anterior portion the ovaries. The 

 anal opening in the mature female cyst becomes displaced; it is 

 represented in Fig. 27 at /. Fig. 28, Plate IV, represents the 

 uterus and ovaries very highly magnified. 



V. 



DEVELOPMENT AND INIETAMORPHOSES. 



{See Plate IV). 



Eggs. — The young ova are developed in great numbers in the 

 ovaries. Fig. 28 represents them when some are full grown and 

 the genital tubes are crowded for nearly their entire length. 

 They are very tender and plastic, and when free are spherical. 



