866 DR. F. E. BEDDARD ON 
area occupied by the growing paruterine organ at this stage is 
rather more than a quarter and Jess than a third of the length of 
the proglottid. It is interesting to note that these small 
dimensions apply to the completely formed paruterine organ of 
Rhabdometra nullicollis *. 
Text-figure 3. 
ya 
Portion of an anterior sezment of Rhabdometra cylindrica in horizontal 
section, to show origin of paruterime body. 
7. Longitudinal muscles. par. Paruterine organ. ¢. Testes. ¢.v. Transverse 
water-vascular vessel. 
Text-fig. 4 illustrates a portion of a transverse section of a 
proglottid with a paruterine organ at a more advanced stage of 
development than that represented in the last figure. The 
paruterine organ is distinctly marked off from the surrounding 
* Ransom, loc. cit. p. 30, fig. 22. 
