284 



CHILD. 



[VOL. I. 



The segment b is abnormally short, even more so dorsally 

 than on the ventral surface. In accordance with this fact 

 only partial organs are developed right and left (lb ! and rb'). 

 Ducts connecting with the surface do not appear at all, and on 

 the left no pore is formed. On the right edge, however, a 

 pore appears, of normal size and with atrium and a small por- 

 tion of the oviduct extending inward from it. This portion 

 was found upon examination to present the characteristic 

 appearance of the oviduct and to possess a lumen, but was 



FIG. 39. 



closed at the inner end. The reason for the appearance of a 

 pore on the right edge and not on the left lies, I believe, in the 

 fact that the right edge is longer than the left and thus pre- 

 sents more nearly the conditions of the normal edge. Each of 

 the partial female organs W and rb' consists of a small ovary (o), 

 a small vitellarium (vt}, and the inner portion of the duct, termi- 

 nating in a small, bladder-like, closed seminal receptacle (sr), 

 which is empty. The organs of the dorsal surface are less 

 nearly normal than those of the ventral. Testes appear, but 

 their number is much less than the normal, even in proportion 

 to the small size of the proglottid, for they are scattered very 

 sparsely through the middle region, while other segments of 

 this stage show large numbers of them. No traces of vasa 



