116 



Mr. H. A. Baylis on a 



ova ; while the branches on the outer sides appear normal. 

 h\ younger segments the finger-shaped lobes of the inner 

 halves of the two ovaries are in close contact and somewhat 

 confused. 



As regards the female apparatus the condition in most of 

 the segments of this worm is similar to that normally found 

 in certain genera of cestodes (Dipylidium, Momezia, Gitto- 

 tivnta, to mention only a few well-known examples), but 



Gravid segment of Tcenia saginata, showing abnormal, bilaterally 

 symmetrical arrangement of the genital organs. 



P., P., the two genital pores, from which the two vaginse, V., V., lead 

 to two shell-glands, S., S. From these the main stems (Ut., Ut.) 

 of the two uteri extend forward parallel to each other. 



unknown in Tcenia. Were T. saginata not well known to be 

 a variable species, such a peculiarity might have been con- 

 sidered sufficient ground for creating not merely a new species 

 but even a new genus. There can, however, be no question 

 of this kind in this case, for two reasons. In the first place, 

 the strobila is not entirely composed of double segments, but 

 here and there we find a normal segment with a single pore 

 and median uterus. In the second place, the reduplication 

 extends also to the male organs — not only to the ducts, but 



