98 BULLETIN 69^ UNITED STATES NATIONAL MUSEUM. 



Subgenus KCKINOCOTYLE Blanehard, 1891. 



Suhgeneric diagnosis. — Hymenolejns: Rostellum armed with a single 

 crown of ten slender hooks with dorsal root and blade about equal in 

 length and ventral root rudimentary. Suckers large, flat, armed on 

 the borders and in the middle with small booklets. A sacculus acces- 

 sorius always present. Adults in birds. 



Type-species. — EcJiinocotyle rosseteri Blanchard, 1891. 



ECHINOCOTYLE NITIDA (Krabbe, 1869) Clerc, 1902. 



For description see Krabbe, 1869b, p. 294, pi. 6, figs. 133-135 {Tsenia nitida). — 

 Clerc, 1903, pp. 310-315, pi. 9, figs. 26, 27, 30, 31, 36, 38, 40-42. 



Hosts. — Limosa limosa, Pisohia damacensis , Pelidna alpina, Arqua- 

 iella maritima, Gallinago gallinago. 



ECHINOCOTYLE NITIDULANS (Krabbe, 1882) Fuhrmann, 1906. 



For description see Krabbe, 1882a, p. 353, pi. 1, figs. 16, 17 {Taenia nilidulans). 

 Hosts. — /Egialitis Jiiaticula, Pelidna alpina. 



ECHINOCOTYLE ROSSETERI Blanchard, 1891. 



For description see Blanchard, 1891t, pp. 424-428, figs. 1-3. — Stiles, 1896f, 

 pp. 55-56, pi. 19, figs. 247-251. 



Host. — Anas platyrhynchos domestica. 



Genus DIORCHIS Clerc, 190S. 



Generic diagnosis. — Hymenolepidinse : Rostellum with a single crown 

 of ten hooks w^ith long dorsal and short ventral roots or exceptionally 

 with very short dorsal root and with ventral root nearly as long as the 

 blade. Surface of suckers may be armed with minute spines. Inner 

 longitudinal muscle layer consisting of 8 bundles, 4 dorsal and 4 ven- 

 tral. Two testicles in each segment. Adults in birds. 



Type-species. — DiorcMs acuminata (Clerc, 1902) Clerc, 1903. 



* DIORCHIS ACUMINATA (Clerc, 1902) Clerc, 1903. 



For description see Clerc, 1903, pp. 281-284, pi. 9, fig. 25; pi. 11, figs. 78, 88.— 

 Ransom, 1909, pp. 42-48, figs. 30-36 (the present paper). 



Hosts. — Nettion crecca, Mareca penelope, Ghaulelasmus streperus, 

 Fulica atra, ^Fulica americana. 



* DIORCHIS AMERICANA Ransom, 1909. 



For description see Ransom, 1909, pp. 48-51, fi.gs. 37-42 (the present paper). 



Host. — * Fulica america7ia. 



DIORCHIS INFLATA (Rudolphi, 1819) Clerc, 1903. 



For description see Krabbe, 1869b, pp. 285-286, pi. 5, figs. 109-111 (Tsenia ■ 

 inflata).— J AcoBi, 1898c, pp. 95-104, 1 pi. (T. injlata) .—Conys , 1901b, pp. jj 

 330-331 (Hymenolepis in^a to). —Clerc, 1903, pp. 284-288, pi. 11, fig. 89.— 1 

 LiNSTow, 1906, pp. 15-17, pi. 1, figs. 17, 18 {H. inflata). 



Host. — Fulica atra. 



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