in lengrtli and beiomins siaJual'y broader to within a short 

 distance o( the posterior extremity when they become nar- 

 i-ower, giving the body a lancet shai>e. Genital pores unilat- 

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

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

 of segment fi-om genital pore (Feuereisen). Eggs with very 

 thin external shell 50 f by 35 /*'; hooks of onco^here S M- De- 

 velopment: Unknown. 



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

 obscura); tame goose (Anser anser dom.); niuscovy duck (Cai- 

 rina moschata); white-headed duck (Erismatura leucocephala) ; 

 pochard (AyUiya ferina): African teal (.\ythya nyroca); red- 

 crest«id pochard (Aythya ruflna); flamingo (Phoenicopterus 

 antiquorum). 



Geographical distribution: England, Denmark, France, Ger- 

 many and Austria. Epidemic in 1710. reported by Frisch. 



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

 lean geese: Goeze (17S2. pp. 377-3S3) says that it is most com- 

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

 (1S<5, 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 (1S69, pp. 

 295-296) found this form in 77 geese out of 400 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 (17S1, pp. 155-156) is attributed 

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

 Megnin (ISSIA. pp. 29-32) has found it In ducks and geese in 

 Prance, Railliet flS93. pp. 299-300) in Ardennes Franx?e. Lucet 

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

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

 England. 



.\uthoi-s generally consider that there is little or no difficulty 

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

 perfectly understood. 



ISIOJ Krabbe, I$ii9) Railliet. 



(1S6S, "T. setigera Frolich. " 17S9 of Feuerisen [nee Frolich v. 



Siebold, 1S4S1; 1S69,T. fasciata Krabbe.) 

 ( ? ISOO. Alyselminthus crenatus (Goeze. 17S2) Zeder pars — vide 

 Rud.. ISIO: ? 1S03, Halysis crenata (Goeze. 17S2) Zeder pars- 

 vide Rud.. ISIO; Taenia fasciata Rud.). 



[PI. V. figs. 56-66; PI. VI. figs. 67-76; PI. VII. figs. 77-79.] 



Diagnosis: Body 60'n'n to ]60»>n> long by li"" to 2"""' broad. 



Head hemispherical, compressed. O.S.Smm broad by 0.25n"'> long; 



