190 DR. F. E. BEDDARD ON THE 



is undoubtedly very abnormal as a Cyclophyllidean Cestode in 

 the form of its scolex. 



It is a circumstance to be noted, that in this tapeworm (see text- 

 fig, 7) the apparently fully mature uterus containing abundant 

 fnlly mature ova is nevertheless not entirely filled by these ova. 

 In fact, among the ripe ova are many cells which are, as I believe, 

 immature ova. Inasmuch as there is not to be observed a series 

 connecting the two extremes, it would appear that the immature 

 ova do not become mature, but perhaps serve as nutriment for a 



Text-figure 8. 



ui. 



Uterine pore (ut.p.) of Dasyurutcsnia. 

 ut. Uterus, iv.v. Lateral water-vascular tube. 



few cells destined to ripen fully. One does not see in this tape- 

 worm what is so usual, namely the uterus filled simply by a 

 densely packed mass of fully mature ova ready to be shed. The 

 ripe eggs are scattered, now frequently, now more sparsely, 

 among a mass of small cells. This circumstance may be 

 connected with the method of evacuating the ripe eggs. It is a 

 commonplace of knowledge, that among the Cyclophyllidea the 

 uterus does not communicate with the exterior through a 

 " preformed " orifice, but that the eggs are finally liberated by 

 the decay of the ripe and detached proglottids, or are never 

 liberated at all, but swallowed while yet within the proglottid by 



