TAENIA NANA. 141 



may be a question whether the scolex might have been Cysticercus 

 tenuicollis. 



Very recently the Tarda with continuous ridges passing through 

 all the segments of the colony have attracted my attention in a 

 remarkable degree, because I have twice found Taenia Ccenurus 

 with six sucking discs and a three-cornered body, one angle of 

 which resembled the longitudinal ridge of our Taenia. Hence the 

 question rises whether the Taenia, No. 3, is not a variety, with six 

 sucking discs, of a species already known either in man or some 

 other mammal (T. mediocanellata, T. ex Cysticerco tenuicolli). 



3. Taenia nana (Bilharz, Von Siebold). 



Corpus filiforme, depressum ; caput antice obtusum, collum versus 

 sensim attenuatum, acetabulis subglobosis, rostello pyriformi un- 

 cinulorum bifidorum corona armatum. Articuli transversi ; cirri 

 unilaterales, ovula globosa, testa laevi simplici (?) instructa ~" 

 magna. Longitudo totalis 6 — 10'". Patria ALgyptus, in hominis 

 intestino tenui semel reperta nwnero permagno. 



The small filiform Taeniae have broad and perfectly developed 

 segments, and a large quadrangular head, at the angles of which 

 the round, sucking discs are placed upon globular elevations ; the 

 head is flat in front and gradually diminishes in breadth and 

 passes into the long slender neck, which is followed by segments 

 which constantly become broader, until at last, at the hinder end 

 of the body, they acquire three or four times the width of the 

 head. These Taeniae only occupy a limited space in the ilium. 



The ova are globular, with a thick, yellowish capsule, which is 

 probably double, for Bilharz speaks of a capsule and perhaps a 

 kind of thin vitelline membrane, as the contents of the ova con- 

 tract under the influence of alcohol. The six booklets of the 

 embryo Taeniae are distinctly seen in the fresh ova. Although 

 Von Siebold himself received specimens, he has contented himself 

 with a very superficial figure of this Taenia, and has not even 

 thought it worth while to give the number, measurement, or a 

 good figure of its hooks, so that the fig. 18 in PI. V of the 4th 

 volume of his ' Zeitschrift ; might just as well have been 

 omitted by him as by us in this place ; the hooks are probably 

 very small. From the number of the Taeniae found, and their 



