82 T. B. ROSSETER OX THE GENITAL ORGANS OF TAENIA SINUOSA. 



renflee a l'extremite, et armee de dix crochets tres-longs (de 0*04:0 

 a 0042 mm.), tres saillants, presque droits; cou tres-long ; les 

 articles males trapezoi'daux ; derniers articles (androgynes ou 

 femelles) plus ou moins arrondis ; orifices genitaux unilateraux ; 

 appareil male forme d'un testicule blanc ou jaun&tre opaque, 

 situe transversaleinent au milieu de chaque article, avec une tige 

 cornee mince, contenue dans un tube herisse de poils et dirige 

 transversalement vers l'orifice genital : a cote de cet orifice se 

 trouve un sac interieur globuleux, tout herisse cle poils ou de 

 petites epines, et paraissant comme un point noir sur le cote de 

 chaque article (d'oii resulte une ligne de points noirs tres 

 reguliere). Je l'ai trouve assez communement a Rennes dans 

 l'oie et le canard " (Duj. Hist, ties Helm., p. 573, No. 35, 

 T. sinueux). 



The specimens upon which I have been working were taken 

 from the intestine of a duck (Anas boschas dom.) fed artificially 

 by me on cysticercoids (Cystkercus sinuosa) taken from the 

 Beverley dairy-farm pond in the parish of St. Stephen's, near 

 Canterbury. The result of feeding was not so successful from 

 the point of view of growth as was anticipated ; nevertheless, the 

 object in view — namely, the production of the mature worm from 

 the cysticercoids for the study of the organs of generation — was 

 obtained. This sets at rest in connection with this avian tape- 

 worm the views expressed at different times by O. von Haman, 

 Von Linstow, Mrazek, and myself, that the cysticercoids found 

 in Copepods by the former, and by myself in Ostracods, were the 

 cystic scolices of Krabbe's T. sinuosa. and of which Stiles, in his 

 work on The Tape-worms of Poultry, said, " For the want of 

 experimental infection is problematical and not positive." 



Although this platyhelminth has been known for the past 

 century and a quarter, and studied by various eminent helmintho- 

 logists, yet, hitherto, the organs of generation have been very 

 inaccurately described and imperfectly portrayed. 



Bespecting the external form of this tape-worm, I am in 

 accordance with Krabbe in accepting Dujardin's determination 

 of Zeder's T. sinuosa ; but the description of the internal anatomy 

 will be taken from notes and observations made from my own 



