355 



The Anatomy of Dicranot^^nia CoRONtrfjU^ , 



By T. B. Eosseter, F.R.M.S. \^ € 



(Bead Ajn-il 20th, 1900.) 



Plates 18 and 19. 



Part 1.— Description and Structure of the Strobila. 



Bicranotceiiia Coronula (Dujardin 1845), Railliet il892, Rosseter 

 1881-1900. 



{Tcenia coronula Duj. 1845). 



No mention is made of tiiis tape-worm in the writings of the 

 older naturalists and helminthologists, either by Linnaeus, Pallas, 

 Goeze or Budolphi, until in the year 1845 it was discovered by 

 Dujardin the French helminthologist and Professor of Zoology 

 at Bennes in France, on more than one occasion, as being 

 parasitic in the alimentary canal of the Dack. Which of the 

 species of the Anatinse he does not state, but I should think, 

 in all probability, it would be Alias hoschas dom. Since then 

 it has been found by Yon Siebold (1854) in Glaucionetta clangula, 

 commune with Tcenia Icevis ; by Krabbe in Zealand (1867-68) 

 in Anas hoschas dom.; by Von Willemoes-Suhm (1882) at Munich 

 in Anas hoschas fera; by Bailliet (1892) at Alfort in the same 

 species, and by myself (1881-97) at Canterbury, England, also 

 in Aiuts hoschas dom. This latter is the only recorded instance 

 and report we have of its discovery in this country. 



All the above-mentioned helminthologists have merely given 

 their views, and based their descriptive text on the external 

 characteristics of this worm. Under such circumstances, and 

 having the material to hand, I determined to restudy the 

 anatomy of this avian tape- worm, more especially the organs 

 of generation. The notes and the observations written by me 

 in 1891 on the "Muscular Structure of the Scolex " (Inter - 

 natiorud Journal of Microscopy) will be embodied in this paper ; 

 together with such new material as has been acquired during 

 my investigation of this organ of prehension. 



JouRN. Q. M. C, Series II.— No. 47. 26 



