NEW TAPEWORMS FROM THE HYRAX. 591 



Inermicapsifer^ lie uses the difierences between the egg-capsules 

 in the two genera. He considers that in Zscholckeella the eggs 

 lie " einzeln in einfache Bindegewebskapseln," a difference which 

 also appeared to me to hold good. I do not, however, feel confident 

 about this point, and in view of other points of likeness between 

 the genera am disposed to compare more nearly the paruterine 

 organs in the two. In my paper upon Otiditcenia just refei^red 

 to I have dealt to some extent with the " egg-capsules " of 

 Davainea, of which the various figures published are not quite 

 in unison. I find a justification for this in the paruterine organs 

 of Inermicapsifer capensis, where the appearances vary slightly 

 among examples which I cannot refer to different species. 



To begin with, I prefer the name of paruterine organs for the 

 structures in question, because they seem to me to be exactly 

 comparable to structures so named in other tapeworms. They 

 are, in fact, sacs formed out of the parenchymal tissue, whether 

 they have or have not ultimately a connection with the uterus. 

 I should prefer to term the egg-containing spaces in Otiditcenia 

 " egg-sacs " which are formed in a different way, i. e. by a 

 breaking up of the uterus. When specimens of this hiermi- 

 capsifer were examined alive in salt-solution, the individual 

 paruterine organs could easily be squeezed out of the body 

 by crushing it. They were then spherical or egg-shaped and 

 appeared to be surrounded by a thick, colourless, and almost 

 structureless membrane. This membrane exhibited only faint 

 striae in a longitudinal direction, being thus concentric in reference 

 to the whole body. The interior was filled with quite transparent 

 spherical embryos, between which were abundant cells with 

 granular contents. 



In stained preparations (text-fig. 78) the outer layer was also 

 perfectly distinguishable. It was stained more lightly than the 

 inner by carmine and more deeply by logwood, A figure of the 

 mature organ in Inermicapsifer hyraeis is given by Janicki *, with 

 which may be compared my own figure of the same organ in the 

 species described here. The appearances shown by the organ in 

 the living condition are not borne out by preserved and stained 

 material. The outer layer is not fibrous but cellular, as shown 

 by Janicki and others. This layer is, however, as a rule, quite 

 distinct from the inner mass of cells immediately surrounding 

 the embryos. The distinction between the two partly depends, 

 as already mentioned, upon stains, and is not always obvious. 

 I do not see in my specimens of Ivhermicapsifer capensis so great 

 a distinction between the outer and inner cells in point of size 

 and shape as does Dr. Janicki, which is perhaps rather remarkable 

 in consideration of the very different appearances they present 

 when living. The cells of both layers are, in fact, rounded and 

 nucleated, and not greatly different in size and shape. Those 

 of the inner layer are filled with larger spherules. They are 



* ioe. cit, pi. siv. fig. 28. 



