876 DR. F. E. BEDDARD ON 
medullary parenchyma, but it does not become much hollowed 
out to form a uterus or specially condensed in one part to form a 
single paruterine organ. 
On the contrary, it is condensed here and there to form several 
paruterine organs. In Inermicapsifer hyracis of v. Janicki, a 
hollowing out of the strands of condensed tissue occurs before the 
further condensation of the medullary tissue to form the numerous 
paruterine organs. I am of opinion that all these rather various 
Text-figure 10. 
Transverse section through mature proglottid of Rhabdometra cylindrica. 
ut. Uterus. w.v. Lateral water-vascular tubes. 
eases are upon one common ground plan, which does away with 
the at first apparent differences of importance between such 
closely allied forms as Jnermicapsifer capensis and Zschokkeella 
hyracis; and also relegates to the same category other forms in 
which there is buta single paruterine organ. If these suggestions 
thus briefly sketched out be not accepted, there still remain the 
