16 
Under date of December 1 Bilharz wrote me further with regard to this tapeworm: 
Tsenia nano, is certainly a full-grown animal. I observ*e<l the eggs in the fresh 
animal, which, unfortunately, I never have found again since that time, and also 
recognized them again in samples in alcohol. They are round like balls, have a 
thick yellowish shell, and indeed only one, as it appears to me; yet the contents 
of the eggs contract under the influence of the alcohol into a globular shape, hence 
Fig. 1. — Original type figure of T^nia nana Siebold (=H. nana). Head and portion of strobila. 
Enlarged. (After Siebold. 1S52. fig. IS. i 
Fig. 2. — Original type figure of Tsmia murina Dujardin i=S. nana). Head and portion of strobila. 
Enlarged. i After Dujardin. 1845a, pi. 12, fig. AJL. j 
Fig. 3. — Head and strobila of E). nana. Enlarged, Leuckart. 1S63. p. 393, fig. 112. 
Fig. 4. — Head and jiortion of strobila of H. nana. Enlarged. After Railliet, 1S93. p. 293. fig. 190. . 
there may be present also a thin yolk membrane. The six little hooks of the 
Tsenia embryos were to be seen distinctly in the fresh eggs. I And the cirri, as you 
already have observed, all placed on one and the same side. The eggs are 
in size.’’ 
As a diagnosis for this tapeworm, Bilharz offered the following description: 
Tsenia nana: Body Aliform, depressed; head obtuse anteriorly, gradually tapering 
into the neck, with almost globular suckers and pyriform rostellum armed with a 
