106 L. Stieda on the Tsenise. 



In a sexually mature segment the most striking organ is one 

 situated in the middle, which may be compared, as to its form, 

 with a retort. The neck of this, which is turned towards the 

 margin of the joint, opens into the genital pore, whilst the body 

 of the retort almost touches the lower margin of the joint, and 

 is surrounded here by two other organs. The diameter of the 

 tube at its external orifice is 0*0070 mill,, and enlarges to 

 0-0105 mill. ; the diameter of the body is 0-035-0-053 mill. 

 Its contents consist, as may easily be ascertained, of seminal 

 filaments. Below or above the tube, and often completely con- 

 cealed by it, there is a small vesicle, 0*042 mill, in length and 

 0"0105 mill, in breadth, pointed at both ends, which issues 

 above the orifice of the tube in the genital pore. This is the 

 cirrus-pouch, which contains the small, rarely protruded penis : 

 posteriorly the penis passes into the vas deferens, which here also 

 exhibits no loops, but disappears under the retort-like organ. 

 This retort-like organ occurs also, although not constantly, of 

 the same extent and form in other Tapeworms, and was not 

 imknown to previous observers, but has usually received an 

 erroneous signification. By Dujardin, as appears from his de- 

 scriptions and figures of the Tapeworms of the Shrews observed 

 by him {Tania pistillum, T. tiara, T. scalaris, and T. murina*), 

 it was regarded as the testis opening into the cirrus-pouch — an 

 opinion which has also been expressed very recently by Wein- 

 landf with regard to the same organ in Tania flavopunctata. 

 On the other hand, Professor Leuckart, as I learn from his own 

 communication, long since recognized the corresponding organ 

 in Tania nana as the vaginal canal, with a very greatly dilated 

 receptaculum seminis. From the description above given, no 

 further discussion is necessary as to whether here in Tania unci- 

 nata we are to recognize in this organ the vagina and the seminal 

 receptacle formed out of it which particularly distinguish this 

 group from that of the cystic Tania. On the portion of the 

 receptacle approximated to the lower margin of the segment lies 

 the elliptical germ-stock, filled with finely granular contents, and 

 measuring 0*025 mill, in length and 0-014 mill, in breadth, 

 and on each side the apparently coarsely granular yelk-stocks. 

 I could find no connexion between the germ-stock, yelk- stocks, 

 and receptaculum seminis. The remainder of the joint is occu- 

 pied by from three to five pale transparent testicular vesicles, 

 which are of a round form and 0'035 mill, in diameter. In the 

 segments presenting the next grades of development all the 

 organs, except the cirrus-pouch and the receptaculum seminis, 

 which has a distinct canaliform process to the lower margin of 



* Helminthes, pp. 662 et seq. 



t Beschreibung zweier neuer Tanioiden des Menschen : Jena, 1861, p. 9. 



