i. COTUtJMA BIFARIA (von Slcbuld, IS-IS) Inaiiiare, 1M3. The dou- 

 blc-iiuicU duck taueworiii. 



(184S, Taiiiia lufaiia von Siebold; 1871, T. tuberculala Krefft 

 (nee Rudolphi, 1819).) 



(PI. II, figs. 12-17.) 



Diagnosis: Strobila 39"im to 90"im long by (?) broad. Head 

 triangular, with conical, pointed, (?) unarmed Tostellum and 

 4 small unarmed circular suckers; neck short. Proximal seg- 

 ments small, narrow, gradually enlarged, and rectangular; 

 distal segments the largest, subquadrate. Genital pores double, 

 one each side in about the middle of the margin, prominent in 

 sexually active segments. Male organs: Testicles few in num- 

 ber; each vas deferens inflated into a vesicula seminalis near 

 the anterior margin of the segment, so'mewhat laterally of the 

 median line; from here the seminal canal runs diagonally to 

 the sirrus pouch, which is large; cirrus covered with minute 

 spines. Female oi-gans: Not well understood; evidently 2 ovar- 

 ies present in the posterior portion of the segment, one each 

 side of the median line. 

 Life history: Unknown. 



Type specimen: Collection Siebold in British Museum. 

 Hosts: African Teal (Aythya nyroca), by von Siebold; White- 

 eyed duck, A. australis (Gould), by Krefft. 



Geographical distribution: by von Siebold; Aus- 



tnalia, by Krefft. 



Von Siebold (1848, p. 147) mentions. Taenia bifaria from the 

 intestine of Anas leucophthalmos (=Aythya nyroca). The 

 specimens possessed double genital pores similar to D. caninum. 

 Monticelli (1889, p. 325) examined these specimens, preserved 

 in the British Museum, and gave a short diagnosis. In another 

 paper (1891, pp. 151-153) he gives a more extended description, 

 together with figures. He did not observe hooks on the head 

 hut will not deny their presence. Monticelli states that Krefffs 

 species "T. tubercolata" (=T. tuberculata), described from 

 Aythya australis (Gould), is identical with T. bifaria. Diamare 

 (1893. p. 12) places T. bifaria in the genus Cotugnia. 



b. One median ovary In each segment. 



Genus AMABILIA DIamare, 1893. (Gen. Inq.). 



Diagnosis: Avian cestode with double lateral genital pores; 

 double cirri; ovary single and medium. Type species: Amabilia 

 lamelligera (Owen, 1835) Diamare, 1893. 



