Clinical diagnosis : the bacteriological, chemical, and microscopical evidence of disease . ding backwards grows quickly TAENIA NANA 219 in bulk. The segments are short, and towards the end of the body arescarcely one-fourth so long as they are broad. The uterus is oblong andloaded with eggs of to mm. in diameter. The shell does notexhibit the rod-like structure, but consists of a double membrane, withinwhich are a spiral thread and amorphous matter, in which granules areembedded. In the interior of the egg may be seen the embryo, alreadyprovided with five or six hooklets (fig. 81).
Clinical diagnosis : the bacteriological, chemical, and microscopical evidence of disease . ding backwards grows quickly TAENIA NANA 219 in bulk. The segments are short, and towards the end of the body arescarcely one-fourth so long as they are broad. The uterus is oblong andloaded with eggs of to mm. in diameter. The shell does notexhibit the rod-like structure, but consists of a double membrane, withinwhich are a spiral thread and amorphous matter, in which granules areembedded. In the interior of the egg may be seen the embryo, alreadyprovided with five or six hooklets (fig. 81). The parasite may bepresent in great numbers in the intestine, and is apt to produce severenervous symptoms, such as epileptic seizures, insensibility and mentalderangement, and melancholia (Grassi, Co7?iini).126 Kecent observations go to prove that the Taenia nana is very widelydistributed. It especially attacks children and young persons. It wasfirst discovered by Billiarz in Egypt, and since then has been recognisedas of common occurrence in Italy and It is probable that it. e a f Fig. 81.—Taenia nana : a. Head (with Eostellum drawn in): b. Immature Proglottis ; c. MatureProglottis ; d. Animal (natural size); e. Egg ; /. Hooklets. (Zeisss eye-piece IV., objective VIII.)From a preparation by Dr. Cori. exists elsewhere more frequently than is supposed. Ranson has pub-lished an account which goes to prove that it was observed in Englandso long ago as According to Grassi, Tsenia nana is in Sicily thecommonest parasite. The number present in a single individual mayreach 4000-5000. Mertens has shown that it occurs in 4. Tsenia diminuta seu flavopunctata.—Weinland, and after him Leidy andParona,129 have described a parasite of the human intestine which they calledTaenia flavopunctata. It was later identified by Grassi with Tsenia diminuta,which infests certain of the rats. It is allied to Taenia nana, is 20-60 cm. inlength, has a rudimentary roste
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