8. niCTtANOTAKNIA FURPIGERA (Riirtnlphl. 1819) StUes, 1896. 



(.l.MU, "T. iriliiu-iita liatsch" of Kudulphi; lf>l!i, T. luri;igi.'ia 

 Rudolphi ex Nitzsch, MS.; 1845, T. rhomiboidea Duj.; 1893, 

 Dicranotaenia rhoniboidea (Dujaidin, 1845) Railliet.) 

 ( ? 1779. Taenia lineata Bloch; ? 1786, T. trilineata Batch; ? 

 1790, T. Anatis /? lineata Gmelin; ? 1802,T. longirostris Frolich 

 [nee Rud., 1S19"| ? 1S03, Halysis trilineata (Batsch. 1786) Zeder; 

 ? 1S5S. T. conioa Molin.) 



[PI. Ill, figs. 31-34 (35-36).-l 

 Diagnosis; lOO""" to 35""" long by 0.5 to 1mm broad. Head 

 0.46mm to O.o2mm, rhomboidal, or prolonged anteriorily in a tube 

 containing a thick ovoide, oblong, rostellum 0.22mm to 0.25mm 

 long, armed with a single crown of hooks 65 ft to 66 /t (Dujardin). 

 48 /i to 58 ^ (Krabbe) long. Suckers O.lSmm in diameter. Seg- 

 ments trapezoidal, 2 to 3 times longer than broad. Genital 

 pores unilateral. Penis 9.7 fi broad, smooth. Embryo 36 /i; 

 hooks of embryo 14 /< (Krabbe), 16 /i to 17 /i (Dujardin). De- 

 velopment not known. 



Hosts: Mallard ducks (Anas boschas) by Dujardin, Nitzch, 

 Krabbe, Friis; Pochard (Aythya terina); is erroneously stated 

 to have been found in domestic ducks, according to Railliet. 

 See also hosts for T. conica, T. lineata, and T. trilineata, in 

 chart at end of text, taken from von Linstow, 1878, and others. 

 Geographical distribution; France (by Dujardin), Italy (by 

 de Ninni), Iceland (Krabbe), Schleswig (Friis). Epidemics, 

 none recorded. 



The early history of this worm is buried under indefinite and 

 incomplete statements upon superficially studied material. 

 We can. how-ever, trace the species with certainty as far back 

 as Rudolphi, 1819. p. 528. Nitzsch collected some worms from 

 the Mallard in 1816. and sent them to Rudolphi. evidently under 

 the MS. label Taenia furcigera. Rudolphi determined the 

 worms as T. trilineata Batsch. 1786. which according to Krabbe 

 (1869, p. 315). (Batsch's original not at my disposal), is a name 

 Batsch introduced for Bloch's T. lineata of 1779. Krabb? after- 

 ward examined Nitzsch's specimens, and states (1869, p. 315) 

 that they are identical with T. rhomboidea Dujardin. 1845. I 

 adopt Nitzsch's name for the reasons given in the footnote.i 



'.A. very delicate piiint of nomenclature is involved in this 

 case, and one which has been entirely overlooked by helm.in- 

 Ihologists. In the first place, the name trilineata should be 

 suppressed because (Krabbe. 1869. p. 315) it was originally in- 

 tended for a species (i. e.. T lineata from A. penelope, A. oircia. 

 Dafila acuta) already named and figured. .Accordingly, tri- 



