90 BULLETIN 69, UNITED STATES NATIONAL MUSEUM. 



Genus HYMENOLEPIS Weinland, 1 8S8. 



Biplacanthus Weinland, 1858 (not Agassiz 1842, fish). 



Lepidotrias Weinland, 1858. 



Drepanidotasnia Railliet, 1892. 



Dicranotsenia Railliet, 1892. 



Echinocotyle Blanchard, 1891. 



Triorchis Clerc, 1903 (1903, p. 286). 



Generic (^m^Tiosis.^Hymenolepidinse: Rostellum generally well de- 

 veloped and armed with a single crown of hooks, or more rarely rudi- 

 mentary and unarmed. Suckers in adult rarely armed with hook- 

 lets or fine spines; are generally unarmed. Testicles three in each 

 segment. Vas deferens with internal (i. e., inside the cirrus pouch) 

 as well as external seminal vesicle (outside the cirrus pouch). Sac- 

 culus accessorius generally absent. Adults in mammals and birds. 



Type-species. — Hymenolepis flavopunctata Weinland, 1858 = Hy- 

 menolepis diminuta (Rudolphi, 1819) Blanchard, 1891. 



Subgenias H^^MlIDlSrOLEPIS Weinland, 1S58. 



Suhgeneric diagnosis. — Hymenolepis: Rostellum generally well de- 

 veloped and armed with a single crown of hooks, or more rarely rudi- 

 mentary and unarmed. Suckers in adult generally unarmed, or, 

 rarely, their entire surface may be covered with minute spines. Sac- 

 culus accessorius generally absent. Adults in mammals and birds. 



Type-species. — Hymenolepis flavopunctata Weinland, 1858 = Hy- 

 menolepis diminuta (Rudolphi, 1819) Blanchard, 1891. 



HYMENOLEPIS ABORTIVA Linstow, 1904. 



For description see Linstow, 1904m, pp. 382-383, figs. 7-10 {Tsenia {Hymeno- 

 lepis) voluta).a 



Host. — Anas platyrhyncTios. 



HYMENOLEPIS .ffiQUABILIS (Rudolphi, 1810) Cohn, 1901. 



For description see Krabbe, 1869b, pp. 316-317, pi. 8, figs. 212, 213 {Tsenia 

 sequahilis). — Stiles, 18961, pp. 33-34, pi. 3, figs. 29, 30 {Dicranotasnia sequa- 

 MKs).— Clerc, 1903, pp. 290-293, pi. 8, figs. 2, 16, 24 {Drepanidotxnia 

 sequabilis) . 



Hosts.- — Marila marila, Cygnus olor, Cygnus olor domesticus, Olor 

 cygnus. 



HYMENOLEPIS AMPHITRICHA (Rudolphi, 1819) Fuhrmann, 1906. 



For description see Krabbe, 1869b, pp. 311-312, pi. 8, figs. 195-197 {Tsenia 

 amphitricha). ^Gh-Enc, 1903, pp. 293-295, pi. 8, fig. 21 {Drepanidotsenia amphi- 

 tricha) . 



Hosts. — Totanus totanus, Pelidna alpina, Arquatella maritima, 

 Scolopax rusticola. 



o Corrected to Tsenia {Hymenolepis) abortiva, Centralbl. f. Bak., vol. 36, p. 592. 



