598 



in length and Ijecoiniiig gradually broader lu within a short 

 distance of the posteTior extremity when they become nar- 

 rower, giving the body a lancet shape. Genital pores unilat- 

 eral, near anterior corner of segment; penis armed with spines; 

 cirrus-pouch small; testicles 3; female organs on oivposite side 

 of segment fro^m genital pore (Feuereisen). Eggs with very 

 thin external shell 50 jJ- by ;i5 //'; hooks of oncosiphere 8 //. De- 

 \'elopment: Unknown. 



Hosts: Tame duck (Anas boschas dom.); black duck (Anas 

 obscura); tame goose (Anser anser dom.); m'uscovy duck (Cai- 

 rina moschata); whi'te-headed duck (Erismatura leucocephala) ; 

 pochard (Aythya ferina); African teal (Aythya nyroca); red- 

 cresteld pochard (Aythya rufina); flamingo (Phoenicopterus 

 antiquorum). 



Geographical distribution: England, Denmark, France, Ger- 

 many and Austria. Eipidemic in 1710, reported by Frisch. 



Bloch (1782, p. 7-9) found this worml more especially among 

 lean geese; Goeze (1782, pp. 377-383) says that it is most com- 

 mon in lean geese which have been allowed to- roam; Dujardin 

 (1845, p. 562) mentions T. lanceolata as possessing 10 hooks and 

 irregularly alternating genital pores, which makes it probable 

 that he did not have this species before him. Krabbe (1869, pp. 

 295-296) found this form in 77 geese out of 40O examined, or 

 about 20 per cent. The Vienna catalogue gives T. lanceolata 

 and T. sinuosa together for 19 out of 139 tame geese. The epi- 

 demic of 1710 recorded by Frisch (1781, pp. 155-156) is attributed 

 to this species. It has beeni found by various German authors. 

 Megnin (1881A, pp. 29-32) has found it in ducks and geese in 

 France, Railliet (1893, pp. 299-300) in Ardennes France, Lucet 

 in Loiret, France. Railliet states that this is the most com- 

 mon form in geese. Hassall has one specimen from Liverpool, 

 England. 



Authors generally consider that there is little or no difficulty 

 in recognizing this species; its anatomy, however, is very im- 

 l)ei-fectly underPtond. 



n. UKfflPANIDOTAENIA FASClAlA (I? Rudolphi, 1810J Krabbe, IStiU) Railliet, 



1893. 



(1868, "T. setigera Fiolich," 1789 of Feuerisen [nee Frolich v. 



Siebold, 1848]; 1869,T. fasciata Krabbe.) 

 ( ? 1800. Aly.«elminthus crenatusi (Goeze, 1782) Zeder pars — vide 

 Rud., 1810; ? 1S03, Halysis crenata (Goeze, 1782) Zeder pars- 

 vide Rud., 1810; Taenia fasciata Rud.). 



[PI. V, figs. 56-66; PI. VI, figs. 67-76; PI. VIT. figs. 77-79.1 

 Diagnosis: Body 60"iiii to itionun king by lnnn to 2""" broad. 

 Head hemispherical, enmprpssed. 0.35mm broad by 0.25mm long; 



