16 
Under date of December 1 Bilharz wrote me further with regard to this tapeworm: 
Taenia nana is certainly a full-grown animal. I observed 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 Tsenia nana Siebold nana). Head and portion of strobila. 
Enlarged. (After Siebold, 1852, fig. 18.) 
Fig. 2. — Original type figure of Tsenia murina Dujardin (=JT. nana). Head and portion of strobila. 
Enlarged. (After Dujardin, 1845a, pi. 12, fig. Al.) 
Fig. 3. — Head and strobila of H. nana. Enlarged. (After Leuckart, 1863, p. 393, fig. 112.) 
Fig. 4. — Head and portion of strobila of H. nana. Enlarged. (After Railliet, 1893, p. 293, fig. 190). 
there may be present also a thin yolk membrane. The six little hooks of the 
Taenia embryos were to be seen distinctly in the fresh eggs. I find 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: 
Taenia: nana: Body filiform, depressed; head obtuse anteriorly, gradually tapering 
into the neck, with almost globular suckers and pyriform rostellum armed with a 
